Influence of Surface Oxygen Vacancies and Ruthenium Valence State on the Catalysis of Pyrochlore Oxides

Feng, Qi1,2; Zou, Jiexin3; Wang, Yajun3; Zhao, Zhiliang2; Williams, Mark C.3; Li, Hui1,2,4; Wang, Haijiang3,4

2020

10.1021/acsami.9b19352

ACS Applied Materials and Interfaces   影响因子和分区

19448252

1944-8252

Proton exchange membrane (PEM) water electrolysis is a promising energy storage solution by electrochemically splitting water into hydrogen fuel and oxygen. However, the sluggish kinetics, high operating potential, and corrosive acidic environment during the oxygen evolution reaction (OER) require the use of scarce and costly Ir-based oxides, tremendously hampering its large-scale commercialization. Hence, developing active and stable anode catalysts with reduced precious-metal usage is desperately essential. For the first time, we report a group of Y2-xBaxRu2O7 pyrochlore oxides and employ them in acid OER and PEM electrolyzers. We reveal the mechanism for the promoted OER performance of Ba-doped Y2Ru2O7 in which partially replacing Y³⁺ by Ba²⁺ in Y2Ru2O7 greatly facilitates the hole-doping effect, which generates massive oxygen vacancy and multivalence of Ru⁵⁺/Ru⁴⁺, thus boosting the OER performance of Y2-xBaxRu2O7. This work provides an effective method and paradigm for improving the electrocatalytic property of pyrochlore oxides.
Copyright © 2020 American Chemical Society.

pyrochlore oxides oxygen evolution reaction oxygen vacancies Ru valence state A site doping

SCI ; EI

英语

通讯

National Basic Research Program of China (973 Program)[2017YFB0102701] ; Development and Reform Commission of Shenzhen Municipality[1106] ; Shenzhen Peacock Plan[KQTD2016022620054656] ; [2018B030322001] ; [ZDSYS201603311013489] ; Guangdong Innovative and Entrepreneurial Research Team Program[2016ZT06N500]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000510532000034

American Chemical Society

20200408090147

Barium compounds ; Hydrogen fuels ; Hydrogen storage ; Iridium compounds ; Proton exchange membrane fuel cells (PEMFC) ; Reaction kinetics ; Ruthenium ; Ruthenium compounds

Gas Fuels:522 ; Precious Metals:547.1 ; Fuel Cells:702.2 ; Chemical Reactions:802.2 ; Crystalline Solids:933.1

Web of Science

1.School of Materials Science and Engineering, Harbin Institute of Technology, Harbin; 150001, China
2.Department of Materials Science and Engineering, Shenzhen Key Laboratory of Hydrogen Energy, Southern University of Science and Technology, Shenzhen, Guangdong; 518055, China
3.Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen; 518055, China
4.Guangdong Provincial Key Laboratory of Energy Materials for Electric Power, Shenzhen; 518055, China

Feng, Qi,Zou, Jiexin,Wang, Yajun,et al. Influence of Surface Oxygen Vacancies and Ruthenium Valence State on the Catalysis of Pyrochlore Oxides[J]. ACS Applied Materials and Interfaces,2020,12(4):4520-4530.

Feng, Qi.,Zou, Jiexin.,Wang, Yajun.,Zhao, Zhiliang.,Williams, Mark C..,...&Wang, Haijiang.(2020).Influence of Surface Oxygen Vacancies and Ruthenium Valence State on the Catalysis of Pyrochlore Oxides.ACS Applied Materials and Interfaces,12(4),4520-4530.

Feng, Qi,et al."Influence of Surface Oxygen Vacancies and Ruthenium Valence State on the Catalysis of Pyrochlore Oxides".ACS Applied Materials and Interfaces 12.4(2020):4520-4530.