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Title: Electrocatalysts Development for Hydrogen Oxidation Reaction in Alkaline Media: from Mechanism Understanding to Materials Design

Abstract

Anion exchange member (AEM) fuel cells have gained great attention recently mainly owing to the advantages of non-precious metal catalysts application. Despite of the similar oxygen reduction reaction (ORR) kinetics in acid and base, the reaction kinetics of hydrogen oxidation reaction (HOR) is two orders of magnitude slower in alkaline systems than in acid. To understand the slower kinetics of HOR in base, two major interpretations have been proposed, including 1) hydrogen binding energy as a major descriptor for HOR in both acid and base; and 2) bifunctional theory based on the contributions from both hydrogen and hydroxide adsorption for HOR in alkaline electrolyte. Here, we discuss the possible HOR mechanisms in alkaline electrolytes with the corresponding Tafel behavior change. Besides the discussion of traditional Tafel-Volmer and Heyrovsky-Volmer HOR mechanisms, the recently proposed hydroxide adsorption step is discussed to illustrate the HOR mechanism difference in acid and base. We further correlate the hydroxide adsorption step involved mechanism with HOR catalyst design, and summarize its role in HOR and HER activities improvement in alkaline electrolyte over the same catalyst. The representative works of alkaline HOR catalyst development were briefly introduced, and the strategy of strengthening interaction between H2 desorption and H2Omore » recombination was finally proposed for future HOR catalyst design in alkaline environment.« less

Authors:
 [1];  [1];  [2]; ORCiD logo [1]
  1. BATTELLE (PACIFIC NW LAB)
  2. Iowa State University
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1827293
Report Number(s):
PNNL-SA-159087
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Chinese Journal of Catalysis
Additional Journal Information:
Journal Volume: 42; Journal Issue: 12
Country of Publication:
United States
Language:
English
Subject:
Hydrogen oxidation reaction, Hydrogen evolution reaction, Fuel cell, Electrocatalyst, Electrocatalysis

Citation Formats

Qiu, Yang, Xie, Xiaohong, Li, Wenzhen, and Shao, Yuyan. Electrocatalysts Development for Hydrogen Oxidation Reaction in Alkaline Media: from Mechanism Understanding to Materials Design. United States: N. p., 2021. Web. doi:10.1016/S1872-2067(21)64088-3.
Qiu, Yang, Xie, Xiaohong, Li, Wenzhen, & Shao, Yuyan. Electrocatalysts Development for Hydrogen Oxidation Reaction in Alkaline Media: from Mechanism Understanding to Materials Design. United States. https://doi.org/10.1016/S1872-2067(21)64088-3
Qiu, Yang, Xie, Xiaohong, Li, Wenzhen, and Shao, Yuyan. 2021. "Electrocatalysts Development for Hydrogen Oxidation Reaction in Alkaline Media: from Mechanism Understanding to Materials Design". United States. https://doi.org/10.1016/S1872-2067(21)64088-3.
@article{osti_1827293,
title = {Electrocatalysts Development for Hydrogen Oxidation Reaction in Alkaline Media: from Mechanism Understanding to Materials Design},
author = {Qiu, Yang and Xie, Xiaohong and Li, Wenzhen and Shao, Yuyan},
abstractNote = {Anion exchange member (AEM) fuel cells have gained great attention recently mainly owing to the advantages of non-precious metal catalysts application. Despite of the similar oxygen reduction reaction (ORR) kinetics in acid and base, the reaction kinetics of hydrogen oxidation reaction (HOR) is two orders of magnitude slower in alkaline systems than in acid. To understand the slower kinetics of HOR in base, two major interpretations have been proposed, including 1) hydrogen binding energy as a major descriptor for HOR in both acid and base; and 2) bifunctional theory based on the contributions from both hydrogen and hydroxide adsorption for HOR in alkaline electrolyte. Here, we discuss the possible HOR mechanisms in alkaline electrolytes with the corresponding Tafel behavior change. Besides the discussion of traditional Tafel-Volmer and Heyrovsky-Volmer HOR mechanisms, the recently proposed hydroxide adsorption step is discussed to illustrate the HOR mechanism difference in acid and base. We further correlate the hydroxide adsorption step involved mechanism with HOR catalyst design, and summarize its role in HOR and HER activities improvement in alkaline electrolyte over the same catalyst. The representative works of alkaline HOR catalyst development were briefly introduced, and the strategy of strengthening interaction between H2 desorption and H2O recombination was finally proposed for future HOR catalyst design in alkaline environment.},
doi = {10.1016/S1872-2067(21)64088-3},
url = {https://www.osti.gov/biblio/1827293}, journal = {Chinese Journal of Catalysis},
number = 12,
volume = 42,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 2021},
month = {Wed Dec 01 00:00:00 EST 2021}
}

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