Journal ArticleDOI
Enhanced Oxygen Reduction Reaction Activity and Characterization of Pt−Pd/C Bimetallic Fuel Cell Catalysts with Pt-Enriched Surfaces in Acid Media
Licheng Liu,Gabor Samjeské,Shin-ichi Nagamatsu,Oki Sekizawa,Kensaku Nagasawa,Shinobu Takao,Yoshiaki Imaizumi,Takashi Yamamoto,Tomoya Uruga,Yasuhiro Iwasawa +9 more
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In this article, three types of bimetallic Pt nanoparticles with different core-shell structures besides Pt and Pd nanoparticles were synthesized by coreduction and sequential reduction methods in ethylene glycol.Abstract:
Three types of bimetallic Pt–Pd nanoparticles with different core–shell structures besides Pt and Pd nanoparticles were synthesized by coreduction and sequential reduction methods in ethylene glycol. The synthesized nanoparticles were supported on carbon to prepare five different electrocatalysts Pt/C, Pd/C, PdPt alloy/C, Pd(core)–Pt(shell)/C, and Pt(core)–Pd(shell)/C for oxygen reduction reaction (ORR) in fuel cells. The nanoparticles and supported catalysts were characterized by means of transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), extended X-ray absorption fine structure (EXAFS), and cyclic voltammetry (CV). It was proposed by these characterizations that the PdPt alloy/C, Pd(core)–Pt(shell)/C, and Pt(core)–Pd(shell)/C catalysts constituted Pd4Pt1(core)–Pt(two-layers shell), Pd (core)–Pd2Pt1(three-layers)–Pt(three-layers shell), and Pt(core)–Pt2Pd1(two-layers)–Pd (microcrystal shell), respectively. The Pt surface-enriched catal...read more
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Recent Advances in Electrocatalysts for Oxygen Reduction Reaction
TL;DR: 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.
Journal ArticleDOI
Carbon-Supported Pt-Based Alloy Electrocatalysts for the Oxygen Reduction Reaction in Polymer Electrolyte Membrane Fuel Cells: Particle Size, Shape, and Composition Manipulation and Their Impact to Activity
TL;DR: Reduction Reaction in Polymer Electrolyte Membrane Fuel Cells: Particle Size, Shape, and Composition Manipulation and Their Impact to Activity
Electrocatalysis on Platinum Nanoparticles: Particle Size Effect on Oxygen Reduction Reaction Activity
Minhua Shao,Amra Peles +1 more
Abstract: We determined the size-dependent specific and mass activities of the oxygen reduction in HClO(4) solutions on the Pt particles in the range of 1-5 nm. The maximal mass activity at 2.2 nm is well explained based on density functional theory calculations performed on fully relaxed nanoparticles. The presence of the edge sites is the main reason for the low specific activity in nanoparticles due to very strong oxygen binding energies at these sites. Our results clearly demonstrate that the catalytic activity highly depends on the shape and size of the nanoparticles.
Journal ArticleDOI
The development of mixture, alloy, and core-shell nanocatalysts with nanomaterial supports for energy conversion in low-temperature fuel cells
Nguyen Viet Long,Yong Yang,Cao Minh Thi,Nguyen Van Minh,Yanqin Cao,Masayuki Nogami,Masayuki Nogami +6 more
TL;DR: In this paper, the authors present the development of Pt-based catalysts and the uses of Ptbased bimetallic and multi-metallic nanoparticles with mixture, alloy and core-shell structures for nanocatalysis, energy conversion, catalytic nanomaterials and fuel cells (FCs).
Journal ArticleDOI
Koutecky-Levich analysis applied to nanoparticle modified rotating disk electrodes: Electrocatalysis or misinterpretation
TL;DR: In this paper, the application of naive Koutecky-Levich analysis to micro-and nano-particle modified rotating disk electrodes of partially covered and non-planar geometry is critically analysed.
References
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Journal ArticleDOI
Origin of the Overpotential for Oxygen Reduction at a Fuel-Cell Cathode
Jens K. Nørskov,Jan Rossmeisl,and Ashildur Logadottir,L. Lindqvist,John R. Kitchin,Thomas Bligaard,Hannes Jónsson +6 more
TL;DR: In this paper, the stability of reaction intermediates of electrochemical processes on the basis of electronic structure calculations was analyzed and a detailed description of the free energy landscape of the electrochemical oxygen reduction reaction over Pt(111) as a function of applied bias was presented.
Book
Atlas of Electrochemical Equilibria in Aqueous Solutions
TL;DR: The Atlas of Electrochemical Equilibria in Aqueous solutions as discussed by the authors is the most complete and complete work on aqueous solvents, which includes a detailed description of the properties of the solvers.
Journal ArticleDOI
Materials for fuel-cell technologies
TL;DR: Recent progress in the search and development of innovative alternative materials in the development of fuel-cell stack is summarized.
Journal ArticleDOI
Activity benchmarks and requirements for Pt, Pt-alloy, and non-Pt oxygen reduction catalysts for PEMFCs
TL;DR: In this article, the authors quantified the activities and voltage loss modes for state-of-the-art MEAs (membrane electrode assemblies), specifies performance goals needed for automotive application, and provides benchmark oxygen reduction activities for state of the art platinum electrocatalysts.