In Operando Identification of Geometrical-Site-Dependent Water Oxidation Activity of Spinel Co 3 O 4

Wang, Hsin‐Yi; Hung, Sung‐Fu; Chen, Han‐Yi; Chan, Ting‐Shan; Chen, Hao Ming; Liu, Bin

doi:10.1021/jacs.5b10525

articleJournal of the American Chemical SocietyDec 28, 2015Closed access

In Operando Identification of Geometrical-Site-Dependent Water Oxidation Activity of Spinel Co 3 O 4

HWHsin‐Yi Wang SHSung‐Fu Hung HCHan‐Yi Chen TCTing‐Shan Chan HMHao Ming Chen

Nanyang Technological University · National Taiwan University · +1 more institution

PubMed

Indexed incrossrefpubmed

Abstract

Spinel Co3O4, comprising two types of cobalt ions: one Co(2+) in the tetrahedral site (Co(2+)(Td)) and the other two Co(3+) in the octahedral site (Co(3+)(Oh)), has been widely explored as a promising oxygen evolution reaction (OER) catalyst for water electrolysis. However, the roles of two geometrical cobalt ions toward the OER have remained elusive. Here, we investigated the geometrical-site-dependent OER activity of Co3O4 catalyst by substituting Co(2+)(Td) and Co(3+)(Oh) with inactive Zn(2+) and Al(3+), respectively. Following a thorough in operando analysis by electrochemical impedance spectroscopy and X-ray absorption spectroscopy, it was revealed that Co(2+)Td site is responsible for the formation of…

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Topics & keywords

Topics

Keywords

Cobalt
Chemistry
Oxygen evolution
Spinel
Catalysis
Octahedron
Inorganic chemistry
X-ray absorption spectroscopy

UN Sustainable Development Goals

Clean water and sanitation

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