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Yuehe Lin - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced Electrocatalytic Activities of PtCuCoNi Three-Dimensional NanoPorous Quaternary Alloys for Oxygen Reduction and Methanol Oxidation Reactions
    ACS applied materials & interfaces, 2016
    Co-Authors: Chengzhou Zhu, Yuehe Lin
    Abstract:

    Control of morphology and composition could precisely and efficiently alter the catalytic properties of Pt-based materials, improving the electrocatalytic activity and durability. Here we proposed a rapid, controllable synthesis of three-dimensional PtCuCoNi quaternary alloys with low Pt-group metal, which were directly synthesized by reducing metal precursors in aqueous solution. The resultant quaternary alloys show excellent oxygen reduction and methanol oxidation reaction activities in acid solution. By rational tuning of the composition of PtCuCoNi alloys, they achieved a mass activity of 0.72 A/mgPt on the basis of Pt mass for oxygen reduction reaction. Moreover, the durability is also higher than that of commercial Pt/C catalyst. These PtCuCoNi quaternary alloys characterized by three-dimensional Porous Nanostructures hold attractive promise as substitutes for carbon-supported Pt catalysts with improved activity and stability.

  • highly efficient nonprecious metal catalysts towards oxygen reduction reaction based on three dimensional Porous carbon Nanostructures
    Chemical Society Reviews, 2016
    Co-Authors: Chengzhou Zhu, Yuehe Lin
    Abstract:

    Developing a low cost, highly active, durable cathode towards an oxygen reduction reaction (ORR) is one of the high-priority research directions for commercialization of low-temperature polymer electrolyte membrane fuel cells (PEMFCs). However, the electrochemical performance of PEMFCs is still hindered by the high cost and insufficient durability of the traditional Pt-based cathode catalysts. Under these circumstances, the search for efficient alternatives to replace Pt for constructing highly efficient nonprecious metal catalysts (NPMCs) has been growing intensively and has received great interest. Combining with the compositional effects, the accurate design of NPMCs with 3D Porous Nanostructures plays a significant role in further enhancing ORR performance. These 3D Porous architectures are able to provide higher specific surface areas and larger pore volumes, not only maximizing the availability of electron transfer within the nanosized electrocatalyst surface area but also providing better mass transport of reactants to the electrocatalyst. In this Tutorial Review, we focus on the rational design and synthesis of different 3D Porous carbon-based nanomaterials, such as heteroatom-doped carbon, metal–nitrogen–carbon Nanostructures and a series of carbon/nonprecious metal-based hybrids. More importantly, their enhanced ORR performances are also demonstrated by virtue of their favorably Porous morphologies and compositional effects. Finally, the future trends and perspectives for the highly efficient Porous NPMCs regarding the material design are discussed, with an emphasis on substantial development of advanced carbon-based NPMCs for ORR in the near future.

  • facile one step synthesis of three dimensional pd ag bimetallic alloy networks and their electrocatalytic activity toward ethanol oxidation
    ACS Applied Materials & Interfaces, 2015
    Co-Authors: Chengzhou Zhu, Yuehe Lin
    Abstract:

    The three-dimensional palladium networks and palladium–silver bimetallic alloy networks were synthesized at room temperature on a large scale using a rapid and simple strategy. The results revealed that the morphology of the networks is not affected by the composition. We demonstrated that the as-prepared unsupported networks exhibited excellent electrochemical activity and stability toward ethanol oxidation reaction in alkaline media due to the formation of palladium–silver alloys as well as the Porous Nanostructures. The results indicate that the well-defined three-dimensional palladium–silver bimetallic alloy networks are promising catalysts for fuel cells.

Chengzhou Zhu - One of the best experts on this subject based on the ideXlab platform.

  • self assembled fe n doped carbon nanotube aerogels with single atom catalyst feature as high efficiency oxygen reduction electrocatalysts
    Small, 2017
    Co-Authors: Chengzhou Zhu, Junhua Song, Qiurong Shi, Mark H Engelhard, Dongdong Xiao, Luis Estevez
    Abstract:

    : Self-assembled M-N-doped carbon nanotube aerogels with single-atom catalyst feature are for the first time reported through one-step hydrothermal route and subsequent facile annealing treatment. By taking advantage of the Porous Nanostructures, 1D nanotubes as well as single-atom catalyst feature, the resultant Fe-N-doped carbon nanotube aerogels exhibit excellent oxygen reduction reaction electrocatalytic performance even better than commercial Pt/C in alkaline solution.

  • Enhanced Electrocatalytic Activities of PtCuCoNi Three-Dimensional NanoPorous Quaternary Alloys for Oxygen Reduction and Methanol Oxidation Reactions
    ACS applied materials & interfaces, 2016
    Co-Authors: Chengzhou Zhu, Yuehe Lin
    Abstract:

    Control of morphology and composition could precisely and efficiently alter the catalytic properties of Pt-based materials, improving the electrocatalytic activity and durability. Here we proposed a rapid, controllable synthesis of three-dimensional PtCuCoNi quaternary alloys with low Pt-group metal, which were directly synthesized by reducing metal precursors in aqueous solution. The resultant quaternary alloys show excellent oxygen reduction and methanol oxidation reaction activities in acid solution. By rational tuning of the composition of PtCuCoNi alloys, they achieved a mass activity of 0.72 A/mgPt on the basis of Pt mass for oxygen reduction reaction. Moreover, the durability is also higher than that of commercial Pt/C catalyst. These PtCuCoNi quaternary alloys characterized by three-dimensional Porous Nanostructures hold attractive promise as substitutes for carbon-supported Pt catalysts with improved activity and stability.

  • highly efficient nonprecious metal catalysts towards oxygen reduction reaction based on three dimensional Porous carbon Nanostructures
    Chemical Society Reviews, 2016
    Co-Authors: Chengzhou Zhu, Yuehe Lin
    Abstract:

    Developing a low cost, highly active, durable cathode towards an oxygen reduction reaction (ORR) is one of the high-priority research directions for commercialization of low-temperature polymer electrolyte membrane fuel cells (PEMFCs). However, the electrochemical performance of PEMFCs is still hindered by the high cost and insufficient durability of the traditional Pt-based cathode catalysts. Under these circumstances, the search for efficient alternatives to replace Pt for constructing highly efficient nonprecious metal catalysts (NPMCs) has been growing intensively and has received great interest. Combining with the compositional effects, the accurate design of NPMCs with 3D Porous Nanostructures plays a significant role in further enhancing ORR performance. These 3D Porous architectures are able to provide higher specific surface areas and larger pore volumes, not only maximizing the availability of electron transfer within the nanosized electrocatalyst surface area but also providing better mass transport of reactants to the electrocatalyst. In this Tutorial Review, we focus on the rational design and synthesis of different 3D Porous carbon-based nanomaterials, such as heteroatom-doped carbon, metal–nitrogen–carbon Nanostructures and a series of carbon/nonprecious metal-based hybrids. More importantly, their enhanced ORR performances are also demonstrated by virtue of their favorably Porous morphologies and compositional effects. Finally, the future trends and perspectives for the highly efficient Porous NPMCs regarding the material design are discussed, with an emphasis on substantial development of advanced carbon-based NPMCs for ORR in the near future.

  • facile one step synthesis of three dimensional pd ag bimetallic alloy networks and their electrocatalytic activity toward ethanol oxidation
    ACS Applied Materials & Interfaces, 2015
    Co-Authors: Chengzhou Zhu, Yuehe Lin
    Abstract:

    The three-dimensional palladium networks and palladium–silver bimetallic alloy networks were synthesized at room temperature on a large scale using a rapid and simple strategy. The results revealed that the morphology of the networks is not affected by the composition. We demonstrated that the as-prepared unsupported networks exhibited excellent electrochemical activity and stability toward ethanol oxidation reaction in alkaline media due to the formation of palladium–silver alloys as well as the Porous Nanostructures. The results indicate that the well-defined three-dimensional palladium–silver bimetallic alloy networks are promising catalysts for fuel cells.

Dan Du - One of the best experts on this subject based on the ideXlab platform.

  • highly efficient nonprecious metal catalysts towards oxygen reduction reaction based on three dimensional Porous carbon Nanostructures
    Chemical Society Reviews, 2016
    Co-Authors: He Li, Shaofang Fu, Dan Du
    Abstract:

    Developing a low cost, highly active, durable cathode towards an oxygen reduction reaction (ORR) is one of the high-priority research directions for commercialization of low-temperature polymer electrolyte membrane fuel cells (PEMFCs). However, the electrochemical performance of PEMFCs is still hindered by the high cost and insufficient durability of the traditional Pt-based cathode catalysts. Under these circumstances, the search for efficient alternatives to replace Pt for constructing highly efficient nonprecious metal catalysts (NPMCs) has been growing intensively and has received great interest. Combining with the compositional effects, the accurate design of NPMCs with 3D Porous Nanostructures plays a significant role in further enhancing ORR performance. These 3D Porous architectures are able to provide higher specific surface areas and larger pore volumes, not only maximizing the availability of electron transfer within the nanosized electrocatalyst surface area but also providing better mass transport of reactants to the electrocatalyst. In this Tutorial Review, we focus on the rational design and synthesis of different 3D Porous carbon-based nanomaterials, such as heteroatom-doped carbon, metal–nitrogen–carbon Nanostructures and a series of carbon/nonprecious metal-based hybrids. More importantly, their enhanced ORR performances are also demonstrated by virtue of their favorably Porous morphologies and compositional effects. Finally, the future trends and perspectives for the highly efficient Porous NPMCs regarding the material design are discussed, with an emphasis on substantial development of advanced carbon-based NPMCs for ORR in the near future.

Rui Ding - One of the best experts on this subject based on the ideXlab platform.

  • Porous nico2o4 Nanostructures as bi functional electrocatalysts for ch3oh oxidation reaction and h2o2 reduction reaction
    Electrochimica Acta, 2013
    Co-Authors: Rui Ding, Mingjun Jia, Hongyu Wang
    Abstract:

    Porous nickel cobaltite (NiCo2O4) Nanostructures were synthesized via a facile chemical deposition route. Their physicochemical properties were characterized via X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and nitrogen sorption measurements. Their electrocatalytic performances were investigated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) tests. The obtained NiCo2O4 materials exhibit typical agglomerate Porous Nanostructures with the specific surface area (SSA) and pore volume of 190.1 m(2) g(-1) and 1.136 cm(3) g(-1) Remarkably, the NiCo2O4 materials exhibit higher electrocatalytic activity, lower overpotential, better stability and greater tolerance compared to those of NiO and Co3O4 materials synthesized by the same procedure. As for the NiCo2O4 electrode, a current density of 98 mA cm(-2) was obtained toward CH3OH electro-oxidation at 0.6V in 1 M KOH and 0.5 M CH3OH electrolytes, and a current density of 223 mA cm(-2) was achieved toward H2O2 electro-reduction at -0.3 V in 3M NaOH and 0.5 M H2O2 electrolytes. Moreover, the NiCo2O4 electrode shows a desirable stability for both electrocatalytic reactions. The impressive electrocatalytic activity is largely attributable to the binary electroactive sites of Co and Ni species, intrinsic high electronic conductivity and superior Porous Nanostructures of the NiCo2O4 electrode, which are very promising for further development of high performance non-Pt catalysts alkaline fuel cells (AFCs).

Prabhash Mishra - One of the best experts on this subject based on the ideXlab platform.

  • a review on 2d transition metal di chalcogenides and metal oxide Nanostructures based no2 gas sensors
    Materials Science in Semiconductor Processing, 2020
    Co-Authors: Sunil Kumar, V S Pavelyev, Prabhash Mishra, Nishant Tripathi, Prachi Sharma, F Calle
    Abstract:

    Abstract NO2, having a reddish-brown color and biting odor, is the most prominent toxic waste present in the atmosphere. The major contributors to NO2 gas include emissions from industrial and transport sectors. There are many Porous Nanostructures which have shown enormous potential for NO2 gas sensing. Among these, the first group comprises metal oxides while the second group includes two-dimensional transition metal dichalcogenides (2D TMDs). Besides, these materials have also been modified or functionalized with different metals for improving various sensing parameters such as selectivity, sensitivity, affordability, stability and life span of the device. In this article, we discuss new developments in the fields of metal oxide Nanostructures and 2D TMDs for NO2 sensing. Additionally, a comparative analysis of different modifications and their effects on sensing properties of both the materials is presented.