The Experts below are selected from a list of 282 Experts worldwide ranked by ideXlab platform

Xuping Sun - One of the best experts on this subject based on the ideXlab platform.

  • A cobalt–phosphorus nanoparticle decorated N-doped carbon nanosheet array for efficient and durable Hydrogen evolution at alkaline pH
    Sustainable Energy & Fuels, 2020
    Co-Authors: Rong Zhang, Yongsong Luo, Qian Liu, Guang Chen, Shuyan Gao, Song Chen, Xuping Sun
    Abstract:

    Development of cost-effective electrocatalysts toward the alkaline Hydrogen evolution reaction (HER) is crucial for Electrolytic Hydrogen Production applications. In this communication, we report the electrodeposition of cobalt–phosphorus nanoparticles on a polyimide derived N-doped carbon nanosheet array supported on carbon cloth (Co–P@NC/CC) and it is a robust 3D HER electrode. In 1.0 M KOH, this Co–P@NC/CC shows outstanding catalytic activity with the demand of a low overpotential of 75 mV to drive 10 mA cm−2, outperforming most reported Co–P catalysts. Notably, it also demonstrates strong long-term electrochemical durability.

  • Superior alkaline Hydrogen evolution electrocatalysis enabled by an ultrafine PtNi nanoparticle-decorated Ni nanoarray with ultralow Pt loading
    Inorganic Chemistry Frontiers, 2018
    Co-Authors: Lisi Xie, Qin Liu, Yonglan Luo, Abdullah M. Asiri, Xifeng Shi, Xuping Sun
    Abstract:

    The development of efficient Hydrogen evolution reaction (HER) catalysts is of great importance for Electrolytic Hydrogen Production in alkaline media. In this communication, we report the development of an ultrafine PtNi nanoparticle-decorated Ni nanosheet array with ultralow Pt loading (7.7 wt%) as a superior electrocatalyst for the alkaline HER. Such a nanoarray drives a geometrical current density of 10 mA cm−2 at an overpotential as low as 38 mV in 0.1 M KOH, outperforming commercial 20 wt% Pt/C and all reported HER electrocatalysts. Remarkably, it also shows outstanding long-term electrochemical durability with a faradaic efficiency close to 100%. This work provides us with an attractive ultralow-Pt-content catalyst material in water-splitting devices toward high-performance and durable electrochemical Production of Hydrogen fuels.

  • Bimetallic NiCoP Nanosheets Array for High‐Performance Urea Electro‐Oxidation and Less Energy‐Intensive Electrolytic Hydrogen Production
    ChemistrySelect, 2017
    Co-Authors: Lisi Xie, Xuping Sun, Qin Liu, Yonglan Luo, Zhiang Liu, Abdullah M. Asiri, Fengyu Xie
    Abstract:

    It is highly desired to develop high efficient non-precious metal catalysts for urea oxidation and energy-saving Electrolytic Hydrogen Production. In this communication, we report that bimetallic NiCoP nanosheets array on carbon cloth acts as a superb and stable catalyst for urea oxidation reaction (UOR) with the need of potential of 0.455 V to achieve 50 mA cm−2 in 1.0 M KOH and 0.33 M urea. The excellent catalytic activity for Hydrogen evolution reaction (HER) enables this electrode as a bifunctional UOR and HER catalyst and its two-electrode system affords 20 mA cm−2 at a cell voltage of only 1.25 V, 360 mV smaller than that of pure water splitting, with strong long-term electrochemical stability.

  • bimetallic nicop nanosheets array for high performance urea electro oxidation and less energy intensive Electrolytic Hydrogen Production
    ChemistrySelect, 2017
    Co-Authors: Lisi Xie, Xuping Sun, Qin Liu, Yonglan Luo, Zhiang Liu, Abdullah M. Asiri, Fengyu Xie
    Abstract:

    It is highly desired to develop high efficient non-precious metal catalysts for urea oxidation and energy-saving Electrolytic Hydrogen Production. In this communication, we report that bimetallic NiCoP nanosheets array on carbon cloth acts as a superb and stable catalyst for urea oxidation reaction (UOR) with the need of potential of 0.455 V to achieve 50 mA cm−2 in 1.0 M KOH and 0.33 M urea. The excellent catalytic activity for Hydrogen evolution reaction (HER) enables this electrode as a bifunctional UOR and HER catalyst and its two-electrode system affords 20 mA cm−2 at a cell voltage of only 1.25 V, 360 mV smaller than that of pure water splitting, with strong long-term electrochemical stability.

  • Surface Amorphization: A Simple and Effective Strategy toward Boosting the Electrocatalytic Activity for Alkaline Water Oxidation
    ACS Sustainable Chemistry & Engineering, 2017
    Co-Authors: Rong Zhang, Abdullah M. Asiri, Shuai Hao, Zao Wang, Xiang Ren, Baozhan Zheng, Xuping Sun
    Abstract:

    It is urgent but still remains challenging to boost the alkaline water oxidation activity of transition metal oxide electrocatalysts for applications. In this work, we report our recent finding that surface introduction of an amorphous nickel–borate (Ni-Bi) layer on a nickel oxide (NiO) nanosheet array on carbon cloth (NiO/CC) can greatly enhance its electrochemical water oxidation activity under alkaline conditions. In a 1.0 M KOH solution, the resulting core–shell NiO@Ni-Bi/CC shows superior electrochemical catalytic activity of only 290 mV to drive 10 mA cm–2, 100 mV less than that for NiO/CC. Meanwhile, this catalyst electrode shows great long-term durability for at least 25 h. The high activity can be ascribed to the Ni-Bi layer on NiO promoting NiOOH generation as the active species. This study provides us an abundant water oxidation catalyst in an alkaline water electrolysis device for high-performance, durable Electrolytic Hydrogen Production.

Yan Zhuoyong - One of the best experts on this subject based on the ideXlab platform.

  • Research on non-grid-connected wind power/water-Electrolytic Hydrogen Production system
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Gu Weidong, Yan Zhuoyong
    Abstract:

    Hydrogen has been recognized as the most promising future energy carrier. At present, industrial Hydrogen Production processes are not independent of traditional energy resources, which could easily cause secondary pollution. China has abundant wind energy resources. The total installed capacity of wind power doubled every year in the last five years, and reached 26 000 MW by the end of 2009, but over 9880 MW wind turbines were not integrated into grid because of the peak shaving restraint. In this paper, wind power is directly used in water-Electrolytic process by some technical improvements, to design non-grid-connected wind power/water-Electrolytic Hydrogen Production system. The system all works properly, based on not only the wind/grid complementary power supply but also the independent supply of simulation wind power. The large-scale fluctuation of current density has little impact on current efficiency and gas quality, and only affects gas output. The new system can break through the bottlenecks of wind power utilization, and explore a diversified development way of large-scale wind power, which will contribute to the development of green economy and low carbon economy in China.

  • research on non grid connected wind power water Electrolytic Hydrogen Production system
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Gu Weidong, Yan Zhuoyong
    Abstract:

    Hydrogen has been recognized as the most promising future energy carrier. At present, industrial Hydrogen Production processes are not independent of traditional energy resources, which could easily cause secondary pollution. China has abundant wind energy resources. The total installed capacity of wind power doubled every year in the last five years, and reached 26 000 MW by the end of 2009, but over 9880 MW wind turbines were not integrated into grid because of the peak shaving restraint. In this paper, wind power is directly used in water-Electrolytic process by some technical improvements, to design non-grid-connected wind power/water-Electrolytic Hydrogen Production system. The system all works properly, based on not only the wind/grid complementary power supply but also the independent supply of simulation wind power. The large-scale fluctuation of current density has little impact on current efficiency and gas quality, and only affects gas output. The new system can break through the bottlenecks of wind power utilization, and explore a diversified development way of large-scale wind power, which will contribute to the development of green economy and low carbon economy in China.

Milica P. Marceta Kaninski - One of the best experts on this subject based on the ideXlab platform.

  • Energy consumption of the Electrolytic Hydrogen Production using Zn–Co–Mo based activators—Part I
    Applied Catalysis A: General, 2013
    Co-Authors: Sladjana Lj. Maslovara, Milica P. Marceta Kaninski, Snezana M. Miulovic, Gvozden S. Tasic, Vladimir M. Nikolic
    Abstract:

    Abstract The aim of this work is to investigate the energy consumption of alkaline electrolyser with the in situ added ionic activators. Several concentrations of nickel and tungsten based ionic activators were used in the same alkaline electrolyser, and the energy consumption was calculated and compared to conventional electrolyte. The electrolyser operated at several current densities and temperatures, in order to obtain the optimal concentration of the ionic activators. We have obtained lowering of the energy needed to produce certain amounts of Hydrogen for about 15% compared to standard electrolyte, just using simplified process of the in situ activation with Ni and W based ionic activators. Alkaline electrolyser operated with the selected concentration of d-metals has shown long term stability under industrial conditions.

  • Energy saving in Electrolytic Hydrogen Production using Co–Cr activation – Part I
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Snezana M. Miulovic, Sladjana Lj. Maslovara, Mina M. Seović, Bojan B. Radak, Milica P. Marceta Kaninski
    Abstract:

    The manuscript presents a report on the improved efficiency of alkaline Electrolytic Production of Hydrogen by in situ adding directly into the electrolyte during the Electrolytic process, cobalt and chrome based ionic activators. During electrolysis process the ionic activators deposit on the surface of the Ni cathode electrode and form an active, porous structure of high surface area. This simple process of adding in situ activating compounds directly into electrolyser is reducing the energy requirements per mass unit of Hydrogen produced for about 15%, compared to non-activated system, for a number of current densities in a wide temperature range. Energy saving is higher at higher temperatures and on higher current densities. Structural and morphological characteristic of deposit formed on the cathode during the Electrolytic process after in situ addition of activators, reveal interesting electrode surface pattern with highly developed surface area and uniform distribution of the pores. Obtained deposit also exhibit a long term stability.

  • Electrochemical characterization of the Ni–W catalyst formed in situ during alkaline Electrolytic Hydrogen Production—Part II
    Applied Catalysis A-general, 2011
    Co-Authors: Milica P. Marceta Kaninski, Aleksandar D. Maksić, Djordje P. Saponjic, Ivana M. Perovic, Vladimir M. Nikolic
    Abstract:

    Abstract Objective of this work was to investigate the electrocatalytic efficiency using quasi-potentiostatic, galvanostatic and impedance spectroscopy techniques of the Ni–W catalysts obtained by in situ electrodeposition in an alkaline, 6 M KOH, electrolyser. Synergetic effect is observed, with its maximum at industrial conditions (high temperature and current density). The Tafel slopes are ∼120 mV and exchange current densities are in the range of 10−4 mA cm−2. Results are presented to show the Tafel slopes, the exchange current densities, the apparent energy of activation and the apparent electrochemical surface of the in situ formed Ni–W catalyst. Obtained results could have significant impact on the industrial process for the alkaline Hydrogen Production and suggest to good catalytic performance not only from the increase of the real surface area of the electrodes, but also from the true catalytic effect.

  • Comparison of different electrode materials—Energy requirements in the Electrolytic Hydrogen evolution process
    Journal of Power Sources, 2006
    Co-Authors: Milica P. Marceta Kaninski, Dragica Lj. Stojić, Đorđe Šaponjić, Nebojša I. Potkonjak, Šćepan S. Miljanić
    Abstract:

    Abstract Hydrogen is one of the most widely produced commodities in the world economy. The basic technologies for producing Hydrogen via the electrolysis of water have long been known. However, there are disadvantages when using this process. Two-thirds of the operation costs of the electrolyzers are electricity costs. The challenge, addressed by numerous companies and researchers in the last few years, is the cost cutting by increasing efficiency of the process. The aim of this work was the attempt to optimize the Electrolytic Hydrogen Production from alkaline solution, through the variation of cathode materials and use of ionic activators. The part of our results shows the better electrocatalytic activity of intermetallic phases and the energy consumption is decreased when compared with the industrial data (4.5–5 kWh m−3 H2). The role of ionic activator used is also very significant. These results give the opportunity for further research of cumulative effect of the intermetallic electrodes and ionic activators on industrial level.

  • Intermetallics as cathode materials in the Electrolytic Hydrogen Production
    International Journal of Hydrogen Energy, 2005
    Co-Authors: Dragica Lj. Stojić, B. Cekić, Aleksandar D. Maksić, Milica P. Marceta Kaninski, Šćepan S. Miljanić
    Abstract:

    Abstract The intermetallics of transition metals have been investigated as cathode materials for the Production of Hydrogen by electrolysis from water–KOH solutions, in an attempt to increase the Electrolytic process efficiency. We found that the best effect among all investigated cathodes (Hf2Fe, Zr–Pt, Nb–Pd(I), Pd–Ta, Nb–Pd(II), Ti–Pt) exhibits the Hf2Fe phase. These materials were compared with conventional cathodes (Fe and Ni), often used in the alkaline electrolysis. A significant upgrade of the Electrolytic efficiency using intermetallics, either in pure KOH electrolyte or in combination with ionic activators added in situ, was achieved. The effects of these cathode materials on the process efficiency were discussed in the context of transition metal features that issue from their electronic configuration.

Gu Weidong - One of the best experts on this subject based on the ideXlab platform.

  • Research on non-grid-connected wind power/water-Electrolytic Hydrogen Production system
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Gu Weidong, Yan Zhuoyong
    Abstract:

    Hydrogen has been recognized as the most promising future energy carrier. At present, industrial Hydrogen Production processes are not independent of traditional energy resources, which could easily cause secondary pollution. China has abundant wind energy resources. The total installed capacity of wind power doubled every year in the last five years, and reached 26 000 MW by the end of 2009, but over 9880 MW wind turbines were not integrated into grid because of the peak shaving restraint. In this paper, wind power is directly used in water-Electrolytic process by some technical improvements, to design non-grid-connected wind power/water-Electrolytic Hydrogen Production system. The system all works properly, based on not only the wind/grid complementary power supply but also the independent supply of simulation wind power. The large-scale fluctuation of current density has little impact on current efficiency and gas quality, and only affects gas output. The new system can break through the bottlenecks of wind power utilization, and explore a diversified development way of large-scale wind power, which will contribute to the development of green economy and low carbon economy in China.

  • research on non grid connected wind power water Electrolytic Hydrogen Production system
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Gu Weidong, Yan Zhuoyong
    Abstract:

    Hydrogen has been recognized as the most promising future energy carrier. At present, industrial Hydrogen Production processes are not independent of traditional energy resources, which could easily cause secondary pollution. China has abundant wind energy resources. The total installed capacity of wind power doubled every year in the last five years, and reached 26 000 MW by the end of 2009, but over 9880 MW wind turbines were not integrated into grid because of the peak shaving restraint. In this paper, wind power is directly used in water-Electrolytic process by some technical improvements, to design non-grid-connected wind power/water-Electrolytic Hydrogen Production system. The system all works properly, based on not only the wind/grid complementary power supply but also the independent supply of simulation wind power. The large-scale fluctuation of current density has little impact on current efficiency and gas quality, and only affects gas output. The new system can break through the bottlenecks of wind power utilization, and explore a diversified development way of large-scale wind power, which will contribute to the development of green economy and low carbon economy in China.

Milica Marceta P Kaninski - One of the best experts on this subject based on the ideXlab platform.

  • energy saving in Electrolytic Hydrogen Production using co cr activation part i
    International Journal of Hydrogen Energy, 2012
    Co-Authors: Snezana M. Miulovic, Sladjana Lj. Maslovara, Bojan B. Radak, Mina M Seovic, Milica Marceta P Kaninski
    Abstract:

    The manuscript presents a report on the improved efficiency of alkaline Electrolytic Production of Hydrogen by in situ adding directly into the electrolyte during the Electrolytic process, cobalt and chrome based ionic activators. During electrolysis process the ionic activators deposit on the surface of the Ni cathode electrode and form an active, porous structure of high surface area. This simple process of adding in situ activating compounds directly into electrolyser is reducing the energy requirements per mass unit of Hydrogen produced for about 15%, compared to non-activated system, for a number of current densities in a wide temperature range. Energy saving is higher at higher temperatures and on higher current densities. Structural and morphological characteristic of deposit formed on the cathode during the Electrolytic process after in situ addition of activators, reveal interesting electrode surface pattern with highly developed surface area and uniform distribution of the pores. Obtained deposit also exhibit a long term stability.

  • energy consumption of the Electrolytic Hydrogen Production using zn co mo based activators part i
    Applied Catalysis A-general, 2011
    Co-Authors: Sladjana Lj. Maslovara, Snezana M. Miulovic, Milica Marceta P Kaninski, Gvozden S. Tasic, Vladimir M. Nikolic
    Abstract:

    Abstract The aim of this work is to investigate the energy consumption of alkaline electrolyser with the in situ added ionic activators. Several concentrations of nickel and tungsten based ionic activators were used in the same alkaline electrolyser, and the energy consumption was calculated and compared to conventional electrolyte. The electrolyser operated at several current densities and temperatures, in order to obtain the optimal concentration of the ionic activators. We have obtained lowering of the energy needed to produce certain amounts of Hydrogen for about 15% compared to standard electrolyte, just using simplified process of the in situ activation with Ni and W based ionic activators. Alkaline electrolyser operated with the selected concentration of d-metals has shown long term stability under industrial conditions.

  • electrochemical characterization of the ni w catalyst formed in situ during alkaline Electrolytic Hydrogen Production part ii
    Applied Catalysis A-general, 2011
    Co-Authors: Milica Marceta P Kaninski, Aleksandar D Maksic, Djordje P. Saponjic, Ivana M. Perovic, Vladimir M. Nikolic
    Abstract:

    Abstract Objective of this work was to investigate the electrocatalytic efficiency using quasi-potentiostatic, galvanostatic and impedance spectroscopy techniques of the Ni–W catalysts obtained by in situ electrodeposition in an alkaline, 6 M KOH, electrolyser. Synergetic effect is observed, with its maximum at industrial conditions (high temperature and current density). The Tafel slopes are ∼120 mV and exchange current densities are in the range of 10−4 mA cm−2. Results are presented to show the Tafel slopes, the exchange current densities, the apparent energy of activation and the apparent electrochemical surface of the in situ formed Ni–W catalyst. Obtained results could have significant impact on the industrial process for the alkaline Hydrogen Production and suggest to good catalytic performance not only from the increase of the real surface area of the electrodes, but also from the true catalytic effect.

  • ionic activators in the Electrolytic Production of Hydrogen cost reduction analysis of the cathode
    Journal of Power Sources, 2004
    Co-Authors: Milica Marceta P Kaninski, Aleksandar D Maksic, D Stojic, Scepan S Miljanic
    Abstract:

    Abstract As recent technology progress makes Hydrogen a realistic long-term energy option with little or no pollution, development of new methods for its Production and improvement of conventional technology is important. In spite of the fact that, among overall world technologies for Hydrogen Production today, only 4% is produced by electrolysis, this is the most promising method in the future as a consequence of the high existing water supply. The limitation factor for its use on the large scale is well known-high energy consumption. In this work, methods for increasing efficiency and lowering the energy consumption in the Electrolytic Hydrogen Production are presented. The stability of ionic activators, as an indicator of capital cost, are also shown, as are an analysis of composition, structure and morphology characteristic of cathode, formed in the presence as ionic activators.