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Alkaline Electrolyte

The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Wenzhen Li – 1st expert on this subject based on the ideXlab platform

  • electrocatalytic oxygen evolution over supported small amorphous ni fe nanoparticles in Alkaline Electrolyte
    Langmuir, 2014
    Co-Authors: Wenzhen Li

    Abstract:

    The electrocatalytic oxygen evolution reaction (OER) is a critical anode reaction often coupled with electron or photoelectron CO2 reduction and H2 evolution reactions at the cathode for renewable energy conversion and storage. However, the sluggish OER kinetics and the utilization of precious metal catalysts are key obstacles in the broad deployment of these energy technologies. Herein, inexpensive supported 4 nm Ni–Fe nanoparticles (NiyFe1–yOx/C) featuring amorphous structures have been prepared via a solution-phase nanocapsule method for active and durable OER electrocatalysts in Alkaline Electrolyte. The Ni–Fe nanoparticle catalyst containing 31% Fe (Ni0.69Fe0.31Ox/C) shows the highest activity, exhibiting a 280 mV overpotential at 10 mA cm–2 (equivalent to 10% efficiency of solar-to-fuel conversion) and a Tafel slope of 30 mV dec–1 in 1.0 M KOH solution. The achieved OER activity outperforms NiOx/C and commercial Ir/C catalysts and is close to the highest performance of crystalline Ni–Fe thin films r…

  • Electrocatalytic oxygen evolution over supported small amorphous ni-fe nanoparticles in Alkaline Electrolyte
    Langmuir, 2014
    Co-Authors: Yang Qiu, Le Xin, Wenzhen Li

    Abstract:

    The electrocatalytic oxygen evolution reaction (OER) is a critical anode reaction often coupled with electron or photoelectron CO2 reduction and H2 evolution reactions at the cathode for renewable energy conversion and storage. However, the sluggish OER kinetics and the utilization of precious metal catalysts are key obstacles in the broad deployment of these energy technologies. Herein, inexpensive supported 4 nm Ni-Fe nanoparticles (NiyFe1-yOx/C) featuring amorphous structures have been prepared via a solution-phase nanocapsule method for active and durable OER electrocatalysts in Alkaline Electrolyte. The Ni-Fe nanoparticle catalyst containing 31% Fe (Ni0.69Fe0.31Ox/C) shows the highest activity, exhibiting a 280 mV overpotential at 10 mA cm(-2) (equivalent to 10% efficiency of solar-to-fuel conversion) and a Tafel slope of 30 mV dec(-1) in 1.0 M KOH solution. The achieved OER activity outperforms NiOx/C and commercial Ir/C catalysts and is close to the highest performance of crystalline Ni-Fe thin films reported in the literature. In addition, a Faradaic efficiency of 97% measured on Ni0.69Fe0.31Ox/C suggests that carbon support corrosion and further oxidation of nanoparticle catalysts are negligible during the electrocatalytic OER tests. Ni0.69Fe0.31Ox/C further demonstrates high stability as there is no apparent OER activity loss (based on a chronoamperometry test) or particle aggregation (based on TEM image observation) after a 6 h anodization test. The high efficiency and durability make these supported amorphous Ni-Fe nanoparticles potentially applicable in the (photo)electrochemical cells for water splitting to make H2 fuel or CO2 reduction to produce usable fuels and chemicals.

  • selective electro conversion of glycerol to glycolate on carbon nanotube supported gold catalyst
    Green Chemistry, 2012
    Co-Authors: Zhiyong Zhang, Ji Qi, Zhichao Wang, Wenzhen Li

    Abstract:

    Glycerol is electro-converted to glycolate with 85% selectivity on carbon nanotube supported Au catalyst (Au/CNT) in Alkaline Electrolyte at 1.6 V (vs. SHE) under mild reaction conditions (room temperature, atmosphere pressure, water as solvent).

F C Walsh – 2nd expert on this subject based on the ideXlab platform

  • The specific capacitance of sol–gel synthesised spinel MnCo2O4 in an Alkaline Electrolyte
    Electrochimica Acta, 2020
    Co-Authors: Lingbin Kong, Chao Lu, Long Kang, Xiaohong Li, F C Walsh

    Abstract:

    Abstract In this work, high performance spinel MnCo 2 O 4 electrode was fabricated via a facile sol–gel method and its capacitive behavior was successfully investigated in Alkaline Electrolyte. MnCo 2 O 4 electrode was characterized by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The pseudo capacitive behavior of spinel MnCo 2 O 4 was widely investigated in 2 M KOH aqueous Electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge test, and electrochemical impedance spectroscopy (EIS). As a result, the spinel MnCo 2 O 4 exhibited excellent porous structure and the highest specific capacitance of 405 F g −1 was achieved at a current density of 5 mA cm −2 . In addition, the spinel MnCo 2 O 4 displayed desirable stability in Alkaline Electrolyte during long-term cycles with a cycling efficiency of 95.1% over 1,000 cycles. The high specific capacitance and excellent cycling ability of MnCo 2 O 4 show promise for its application in supercapacitors.

  • the specific capacitance of sol gel synthesised spinel mnco2o4 in an Alkaline Electrolyte
    Electrochimica Acta, 2014
    Co-Authors: Lingbin Kong, Chao Lu, Long Kang, Xiaohong Li, F C Walsh

    Abstract:

    Abstract In this work, high performance spinel MnCo 2 O 4 electrode was fabricated via a facile sol–gel method and its capacitive behavior was successfully investigated in Alkaline Electrolyte. MnCo 2 O 4 electrode was characterized by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscope (TEM). The pseudo capacitive behavior of spinel MnCo 2 O 4 was widely investigated in 2 M KOH aqueous Electrolyte using cyclic voltammetry (CV), galvanostatic charge-discharge test, and electrochemical impedance spectroscopy (EIS). As a result, the spinel MnCo 2 O 4 exhibited excellent porous structure and the highest specific capacitance of 405 F g −1 was achieved at a current density of 5 mA cm −2 . In addition, the spinel MnCo 2 O 4 displayed desirable stability in Alkaline Electrolyte during long-term cycles with a cycling efficiency of 95.1% over 1,000 cycles. The high specific capacitance and excellent cycling ability of MnCo 2 O 4 show promise for its application in supercapacitors.

Rongming Wang – 3rd expert on this subject based on the ideXlab platform

  • enhanced catalytic activities of nipt truncated octahedral nanoparticles toward ethylene glycol oxidation and oxygen reduction in Alkaline Electrolyte
    ACS Applied Materials & Interfaces, 2016
    Co-Authors: Shouguo Wang, Chao Wang, Lin Gu, Rongming Wang

    Abstract:

    The high cost and poor durability of Pt nanoparticles (NPs) are great limits for the proton exchange membrane fuel cells (PEMFCs) from being scaled-up for commercial applications. Pt-based bimetallic NPs together with a uniform distribution can effectively reduce the usage of expensive Pt while increasing poison resistance of intermediates. In this work, a simple one-pot method was used to successfully synthesize ultrafine (about 7.5 nm) uniform NiPt truncated octahedral nanoparticles (TONPs) in dimethylformamid (DMF) without any seeds or templates. The as-prepared NiPt TONPs with Pt-rich surfaces exhibit greatly improved catalytic activities together with good tolerance and better stability for ethylene glycol oxidation reaction (EGOR) and oxygen reduction reaction (ORR) in comparison with NiPt NPs and commercial Pt/C catalysts in Alkaline Electrolyte. For example, the value of mass and specific activities for EGOR are 23.2 and 17.6 times higher comparing with those of commercial Pt/C, respectively. Our …

  • Enhanced Catalytic Activities of NiPt Truncated Octahedral Nanoparticles toward Ethylene Glycol Oxidation and Oxygen Reduction in Alkaline Electrolyte
    ACS Applied Materials and Interfaces, 2016
    Co-Authors: Tianyu Xia, Jialong Liu, Shouguo Wang, Chao Wang, Young Sun, Lin Gu, Rongming Wang

    Abstract:

    The high cost and poor durability of Pt nanoparticles (NPs) are great limits for the proton exchange membrane fuel cells (PEMFCs) from being scaled-up for commercial applications. Pt-based bimetallic NPs together with a uniform distribution can effectively reduce the usage of expensive Pt while increasing poison resistance of intermediates. In this work, a simple one-pot method was used to successfully synthesize ultrafine (about 7.5 nm) uniform NiPt truncated octahedral nanoparticles (TONPs) in dimethylformamid (DMF) without any seeds or templates. The as-prepared NiPt TONPs with Pt-rich surfaces exhibit greatly improved catalytic activities together with good tolerance and better stability for ethylene glycol oxidation reaction (EGOR) and oxygen reduction reaction (ORR) in comparison with NiPt NPs and commercial Pt/C catalysts in Alkaline Electrolyte. For example, the value of mass and specific activities for EGOR are 23.2 and 17.6 times higher comparing with those of commercial Pt/C, respectively. Our results demonstrate that the dramatic enhancement is mainly attributed to Pt-rich surface, larger specific surface area, together with coupling between Ni and Pt atoms. This developed method provides a promising pathway for simple preparation of highly efficient electrocatalysts for PEMFCs in the near future.