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Experimental Proof of the Bifunctional Mechanism for the Hydrogen Oxidation in Alkaline Media

Journal Article · · Angewandte Chemie (International Edition)
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [1];  [3];  [1]
  1. Northeastern Univ., Boston, MA (United States). Dept. of Chemistry and Chemical Biology
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
  3. Shanghai Jiao Tong Univ. (China). Shanghai Electrochemical Energy Devices Research Center and Dept. of Chemical Engineering
Realization of the hydrogen economy relies on effective hydrogen production, storage, and utilization. The slow kinetics of hydrogen evolution and oxidation reaction (HER/HOR) in alkaline media limits many practical applications involving hydrogen generation and utilization, and how to overcome this fundamental limitation remains debatable. Here we present a kinetic study of the HOR on representative catalytic systems in alkaline media. Electrochemical measurements show that the HOR rate of Pt-Ru/C and Ru/C systems is decoupled to their hydrogen binding energy (HBE), challenging the current prevailing HBE mechanism. The alternative bifunctional mechanism is verified by combined electrochemical and in situ spectroscopic data, which provide convincing evidence for the presence of hydroxy groups on surface Ru sites in the HOR potential region and its key role in promoting the rate-determining Volmer step. The conclusion presents important references for design and selection of HOR catalysts.
Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource (SSRL)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-76SF00515; SC0012704
OSTI ID:
1433947
Report Number(s):
BNL--203460-2018-JAAM
Journal Information:
Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 49 Vol. 56; ISSN 1433-7851
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (18)

Hydrogen Evolution and Oxidation: Mechanistic Studies and Material Advances journal December 2018
Ni 3 N as an Active Hydrogen Oxidation Reaction Catalyst in Alkaline Medium journal April 2019
The Hydrogen Evolution Reaction in Alkaline Solution: From Theory, Single Crystal Models, to Practical Electrocatalysts journal May 2018
Ni 3 N as an Active Hydrogen Oxidation Reaction Catalyst in Alkaline Medium journal May 2019
Pd‐Decorated Tungsten as Pt‐Free Bimetallic Catalysts for Hydrogen Oxidation Reaction in Alkaline Electrolyte journal December 2019
Preparation of 2D material dispersions and their applications journal January 2018
Nickel–copper supported on a carbon black hydrogen oxidation catalyst integrated into an anion-exchange membrane fuel cell journal January 2018
Ultrathin IrRu nanowire networks with high performance and durability for the hydrogen oxidation reaction in alkaline anion exchange membrane fuel cells journal January 2018
Uniform Pd 0.33 Ir 0.67 nanoparticles supported on nitrogen-doped carbon with remarkable activity toward the alkaline hydrogen oxidation reaction journal January 2019
Engineering of Ru/Ru 2 P interfaces superior to Pt active sites for catalysis of the alkaline hydrogen evolution reaction journal January 2019
Surface modification of Pt nanoparticles with other metals boosting the alkaline hydrogen oxidation reaction journal January 2019
Shaping well-defined noble-metal-based nanostructures for fabricating high-performance electrocatalysts: advances and perspectives journal January 2019
Determining the Viability of Hydroxide-Mediated Bifunctional HER/HOR Mechanisms through Single-Crystal Voltammetry and Microkinetic Modeling journal January 2018
Evaluating Hydrogen Evolution and Oxidation in Alkaline Media to Establish Baselines journal January 2018
Mechanistic Study of the Hydrogen Oxidation/Evolution Reaction over Bimetallic PtRu Catalysts journal January 2018
Origin of Superior HOR/HER Activity of Bimetallic Pt-Ru Catalysts in Alkaline Media Identified via Ru@Pt Core-Shell Nanoparticles journal January 2018
Hydrogen Evolution on Nano-StructuredCuO/Pd Electrode: Raman Scattering Study journal December 2019
Hydrogen Oxidation on Ni-Based Electrocatalysts: The Effect of Metal Doping journal October 2018

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