The Experts below are selected from a list of 81747 Experts worldwide ranked by ideXlab platform
Allen J Bard - One of the best experts on this subject based on the ideXlab platform.
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hydrogen peroxide production in the oxygen Reduction Reaction at different electrocatalysts as quantified by scanning electrochemical microscopy
Analytical Chemistry, 2009Co-Authors: Carlos M Sanchezsanchez, Allen J BardAbstract:We present data for H2O2 production at eight different materials tested as electrocatalysts for the oxygen Reduction Reaction (ORR) in 0.5 M H2SO4 (Hg, Au, Ag, Cu, Pt, Pd, Pd80Co20, and Au60Cu40) using scanning electrochemical microscopy (SECM) as an alternative to the widely used rotating ring-disk electrode (RRDE) method. The amount of H2O2 is related to the total number of electrons, n, found in the O2 Reduction Reaction, with n = 2 showing only H2O2 production and n = 4 showing no H2O2 formation. From the SECM study Hg shows n close to 2, whereas Pt and Pd80Co20 show n-values near 4. The other materials show intermediate n-values as a function of potential.
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electrocatalyst for oxygen Reduction Reaction in proton exchange membrane fuel cells
2005Co-Authors: Arumugam Manthiram, Raghuveer Vadari, Allen J BardAbstract:The present invention includes an apparatus, system and method for screening and making one or more electrocatalysts, electrocatalyst arrays, electrodes and catalysts for an oxygen Reduction Reaction with a Group VIII noble metal in contact with a component-M o form a Group VIII noble metal-M alloy, wherein component-M is one or more metals selected from Groups IIIA, IVA, VIII, IB, IIB, VB, VIB, VIIB and WB of the Periodic Table.
Regis Chenitz - One of the best experts on this subject based on the ideXlab platform.
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Recent Advances in Electrocatalysts for Oxygen Reduction Reaction
Chemical Reviews, 2016Co-Authors: Minhua Shao, Qiaowan Chang, Regis ChenitzAbstract:The recent advances in electrocatalysis for oxygen Reduction Reaction (ORR) for proton exchange membrane fuel cells (PEMFCs) are thoroughly reviewed. This comprehensive Review focuses on the low- and non-platinum electrocatalysts including advanced platinum alloys, core-shell structures, palladium-based catalysts, metal oxides and chalcogenides, carbon-based non-noble metal catalysts, and metal-free catalysts. The recent development of ORR electrocatalysts with novel structures and compositions is highlighted. The understandings of the correlation between the activity and the shape, size, composition, and synthesis method are summarized. For the carbon-based materials, their performance and stability in fuel cells and comparisons with those of platinum are documented. The research directions as well as perspectives on the further development of more active and less expensive electrocatalysts are provided.
Minhua Shao - One of the best experts on this subject based on the ideXlab platform.
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Recent Advances in Electrocatalysts for Oxygen Reduction Reaction
Chemical Reviews, 2016Co-Authors: Minhua Shao, Qiaowan Chang, Regis ChenitzAbstract:The recent advances in electrocatalysis for oxygen Reduction Reaction (ORR) for proton exchange membrane fuel cells (PEMFCs) are thoroughly reviewed. This comprehensive Review focuses on the low- and non-platinum electrocatalysts including advanced platinum alloys, core-shell structures, palladium-based catalysts, metal oxides and chalcogenides, carbon-based non-noble metal catalysts, and metal-free catalysts. The recent development of ORR electrocatalysts with novel structures and compositions is highlighted. The understandings of the correlation between the activity and the shape, size, composition, and synthesis method are summarized. For the carbon-based materials, their performance and stability in fuel cells and comparisons with those of platinum are documented. The research directions as well as perspectives on the further development of more active and less expensive electrocatalysts are provided.
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Palladium-Based Electrocatalysts for Oxygen Reduction Reaction
Lecture Notes in Energy, 2013Co-Authors: Minhua ShaoAbstract:Fuel cells are clean energy devices that are expected to help address the energy and environmental problems in our society. Platinum-based nanomaterials are usually used as the electrocatalysts for both the anode (hydrogen oxidation) and cathode (oxygen Reduction) Reactions. The high cost and limited resources of this precious metal hinder the commercialization of fuel cells. Recent efforts have focused on the discovery of palladium-based electrocatalysts with little or no platinum for oxygen Reduction Reaction (ORR). This chapter overviews the recent progress of electrocatalysis of palladium-based materials including both extended surfaces and nanostructured ones for ORR.
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structural dependence of oxygen Reduction Reaction on palladium nanocrystals
Chemical Communications, 2011Co-Authors: Minhua Shao, Taekyung Yu, Jonathan H OdellAbstract:We have synthesized sub-10 nm Pd cubic and octahedral nanocrystals and then evaluated their activities towards oxygen Reduction Reaction (ORR). The ORR activity of Pd nanocubes was one order of magnitude higher than that of Pd octahedra, and comparable to that of the state-of-the-art Pt catalysts.
Jens K Norskov - One of the best experts on this subject based on the ideXlab platform.
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understanding catalytic activity trends in the oxygen Reduction Reaction
Chemical Reviews, 2018Co-Authors: Ambarish R Kulkarni, Samira Siahrostami, Anjli Patel, Jens K NorskovAbstract:Despite the dedicated search for novel catalysts for fuel cell applications, the intrinsic oxygen Reduction Reaction (ORR) activity of materials has not improved significantly over the past decade. Here, we review the role of theory in understanding the ORR mechanism and highlight the descriptor-based approaches that have been used to identify catalysts with increased activity. Specifically, by showing that the performance of the commonly studied materials (e.g., metals, alloys, carbons, etc.) is limited by unfavorable scaling relationships (for binding energies of Reaction intermediates), we present a number of alternative strategies that may lead to the design and discovery of more promising materials for ORR.
Li Jiang - One of the best experts on this subject based on the ideXlab platform.
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3-D carbon nanotube structures used as high performance catalyst for oxygen Reduction Reaction
Journal of the American Chemical Society, 2010Co-Authors: Wei Xiong, Michael Supp, Terizhandur S. Ramakrishnan, Albert Perez, Yong Liu, Feng Du, Li JiangAbstract:We report a high performance oxygen Reduction Reaction (ORR) catalyst based on vertically aligned, nitrogen-doped carbon nanotube (VA-NCNT) arrays. Characterization in conditions analogous to the operation of a polymer electrolyte membrane fuel cell show ORR taking place on the catalyst at a favorable Reduction potential with a superior current density and greater rate constant.
