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Title: Oxygen Electrocatalysts for Water Electrolyzers and Reversible Fuel Cells: Status and Perspective

Abstract

Hydrogen production by electrochemical water electrolysis has received great attention as an alternative technology for energy conversion and storage. The oxygen electrode has a substantial effect on the performance and durability in water electrolyzers and reversible fuel cells because of its intrinsically slow kinetics for oxygen evolution/reduction and poor durability under harsh operating environments. To improve oxygen kinetics and durability of the electrode, extensive studies for highly active and stable oxygen electrocatalyst have been performed. However, due to the thermodynamic instability of transition metals in acidic media, noble metal compounds have been primarily utilized as electrocatalysts in water electrolyzers and reversible fuel cells. For water electrolyzer applications, single noble metal oxides such as ruthenium oxide and iridium oxide have been studied, and binary or ternary metal oxides have been developed to take synergestic effects of each component. On the other hand, a variety of bifunctional electrocatalysts with a combination of monofunctional electrocatalysts such as platinum for oxygen reduction and iridium oxide for oxygen evolution for reversible fuel cell applications have been mainly proposed. Practically, supported iridium oxide-on-platinum, its reverse type, and non-precious metal-supported platinum and iridium bifunctional electrocatalysts have been developed. Recent theoretical calculations and experimental studies in terms ofmore » water electrolysis and fuel cell technology suggest effective ways to cope with current major challenges of cost and durability of oxygen electrocatalysts for technical applications.« less

Authors:
; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1055398
Report Number(s):
PNNL-SA-88596
EB4216000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Energy & Environmental Science, 5(11):9331-9344
Additional Journal Information:
Journal Name: Energy & Environmental Science, 5(11):9331-9344
Country of Publication:
United States
Language:
English
Subject:
Oxygen Elecctrocatalyst; Water Electrolyzers

Citation Formats

Park, Seh Kyu, Shao, Yuyan, Liu, Jun, and Wang, Yong. Oxygen Electrocatalysts for Water Electrolyzers and Reversible Fuel Cells: Status and Perspective. United States: N. p., 2012. Web. doi:10.1039/c2ee22554a.
Park, Seh Kyu, Shao, Yuyan, Liu, Jun, & Wang, Yong. Oxygen Electrocatalysts for Water Electrolyzers and Reversible Fuel Cells: Status and Perspective. United States. doi:10.1039/c2ee22554a.
Park, Seh Kyu, Shao, Yuyan, Liu, Jun, and Wang, Yong. Thu . "Oxygen Electrocatalysts for Water Electrolyzers and Reversible Fuel Cells: Status and Perspective". United States. doi:10.1039/c2ee22554a.
@article{osti_1055398,
title = {Oxygen Electrocatalysts for Water Electrolyzers and Reversible Fuel Cells: Status and Perspective},
author = {Park, Seh Kyu and Shao, Yuyan and Liu, Jun and Wang, Yong},
abstractNote = {Hydrogen production by electrochemical water electrolysis has received great attention as an alternative technology for energy conversion and storage. The oxygen electrode has a substantial effect on the performance and durability in water electrolyzers and reversible fuel cells because of its intrinsically slow kinetics for oxygen evolution/reduction and poor durability under harsh operating environments. To improve oxygen kinetics and durability of the electrode, extensive studies for highly active and stable oxygen electrocatalyst have been performed. However, due to the thermodynamic instability of transition metals in acidic media, noble metal compounds have been primarily utilized as electrocatalysts in water electrolyzers and reversible fuel cells. For water electrolyzer applications, single noble metal oxides such as ruthenium oxide and iridium oxide have been studied, and binary or ternary metal oxides have been developed to take synergestic effects of each component. On the other hand, a variety of bifunctional electrocatalysts with a combination of monofunctional electrocatalysts such as platinum for oxygen reduction and iridium oxide for oxygen evolution for reversible fuel cell applications have been mainly proposed. Practically, supported iridium oxide-on-platinum, its reverse type, and non-precious metal-supported platinum and iridium bifunctional electrocatalysts have been developed. Recent theoretical calculations and experimental studies in terms of water electrolysis and fuel cell technology suggest effective ways to cope with current major challenges of cost and durability of oxygen electrocatalysts for technical applications.},
doi = {10.1039/c2ee22554a},
journal = {Energy & Environmental Science, 5(11):9331-9344},
number = ,
volume = ,
place = {United States},
year = {2012},
month = {11}
}