TY - JOUR
T1 - Auto-programmed construction of an iron-incorporated cobalt-molybdenum complex towards enhanced electrocatalytic water oxidation
AU - Guo, Yanna
AU - Kang, Yunqing
AU - Kamibe, Takuma
AU - Jiang, Bo
AU - Yamauchi, Yusuke
AU - Sugahara, Yoshiyuki
N1 - Funding Information:
This research was supported by the Japan Society for the Promotion of Science (JSPS Kakenhi no. 22F22029) and the JST-ERATO Yamauchi Materials Space-Tectonics Project (JPMJER2003). This work was performed in part at the Queensland node of the Australian National Fabrication Facility, a company established as a part of the National Collaborative Research Infrastructure Strategy Program to provide nano- and micro-fabrication facilities for Australian researchers.
Publisher Copyright:
© 2022
PY - 2023/2/1
Y1 - 2023/2/1
N2 - Development of metal complexes which can be used directly as electrocatalysts for oxygen evolution reaction (OER) is arousing great interest although still in its infancy. Here, an amorphous iron-incorporated cobalt-molybdenum-dithiooxamide (Dto) complex, Fe-CoMo(Dto), which can be applied directly for water oxidation, has been developed using an one-step room-temperature coordination polymerization and self-assembly process. In-situ electrochemical activation of Fe-CoMo(Dto) during electrocatalytic operation promotes structural evolution to form electrocatalytically active species for OER. Detailed investigation of the intermediates obtained after different cyclic voltammetry (CV) cycles of OER measurement showed that amorphous spherical Fe-CoMo(Dto) nanoparticles evolve gradually into corresponding metal (oxyhydr)oxides with hexagonal nanoplate shapes, which have been identified to be real active species for enhanced OER activity. Consequently, the so-activated Fe-CoMo(Dto) complex exhibits remarkable electrocatalytic activity for OER, with a low overpotential of 294 mV at a current density of 10 mA cm−2 and a reduced Tafel slope of 66 mV dec−1.
AB - Development of metal complexes which can be used directly as electrocatalysts for oxygen evolution reaction (OER) is arousing great interest although still in its infancy. Here, an amorphous iron-incorporated cobalt-molybdenum-dithiooxamide (Dto) complex, Fe-CoMo(Dto), which can be applied directly for water oxidation, has been developed using an one-step room-temperature coordination polymerization and self-assembly process. In-situ electrochemical activation of Fe-CoMo(Dto) during electrocatalytic operation promotes structural evolution to form electrocatalytically active species for OER. Detailed investigation of the intermediates obtained after different cyclic voltammetry (CV) cycles of OER measurement showed that amorphous spherical Fe-CoMo(Dto) nanoparticles evolve gradually into corresponding metal (oxyhydr)oxides with hexagonal nanoplate shapes, which have been identified to be real active species for enhanced OER activity. Consequently, the so-activated Fe-CoMo(Dto) complex exhibits remarkable electrocatalytic activity for OER, with a low overpotential of 294 mV at a current density of 10 mA cm−2 and a reduced Tafel slope of 66 mV dec−1.
KW - Electrochemical activation
KW - Metal complex
KW - Oxygen evolution reaction
KW - Structural evolution
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U2 - 10.1016/j.cej.2022.140464
DO - 10.1016/j.cej.2022.140464
M3 - Article
AN - SCOPUS:85144938399
SN - 1385-8947
VL - 457
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 140464
ER -