Operando spectroscopic monitoring the dynamic transformation of CoNiMoO4 precatalyst toward efficient oxygen evolution
Abstract
Electrochemical water splitting plays a pivotal role in sustainable hydrogen generation, but its efficiency remains constrained by kinetically sluggish oxygen evolution reaction (OER). Herein, CoNiMoO4 nanowires were synthesized and evaluated for potential OER application. The dynamic structural reconstruction during OER operation was monitored by combined in situ Raman and UV–vis spectroscopies, which revealed a phase evolution journey from precursor to hydroxide and finally (oxy)hydroxide at high potentials. Ni doping suppressed the complete oxidation to CoO2 phase and instead facilitated the formation of CoNiOOH intermediates as active species. Furthermore, precise modulation of the d-band center optimized the adsorption energy of oxygen intermediates, achieving enhanced catalytic activity. The findings advance the fundamental understanding of reconstruction in transition metal oxides and offer valuable insights for designing efficient OER catalysts.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (8)
Hongru Hao
School of Physics, Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor Components, Harbin Institute of Technology 1 , Harbin 150001,
Jiahui Wang
School of Chemistry, Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, Xi’an Key Laboratory of Sustainable Polymer Materials
Jian Zhou
Zhe Wang
Shuo Shen
School of Physics, Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor Components, Harbin Institute of Technology 1 , Harbin 150001,
Lingling Xu
Jiangsu Provincial Key Laboratory of Green & Functional Materials and Environmental Chemistry, College of Chemistry and Materials
Zhe Lv
School of Physics, Heilongjiang Provincial Key Laboratory of Advanced Quantum Functional Materials and Sensor Components, Harbin Institute of Technology 1 , Harbin 150001,
Bo Wei
State Key Laboratory of Deep Earth Processes and Resources, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences