Operando unraveling photothermal-promoted dynamic active-sites generation in NiFe 2 O 4 for markedly enhanced oxygen evolution
Abstract
As the electrochemical reconstruction into highly active species is anticipated to arise under the oxidative conditions, activating and tailoring the surface reconstruction via a rational and effective strategy is pivotal to improve the oxygen evolution reaction (OER) activity. In this work, we advance a robust process, that is, the photothermal effect originated from the spinel NiFe 2 O 4 catalyst, to render its dynamic transition into active (Ni,Fe)oxyhydroxides species that triggers highly efficient oxygen evolution. Significantly, the reaction kinetics of OER are improved due to the lowered activation energy, as modulated by the photothermal energy-promoted surface reconstruction. More importantly, the operando Raman spectroelectrochemistry study and first-principle calculation collectively unveil the mechanism of photothermal-assisted enhancement in OER reaction.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Feb 08, 2021
- Source ID
- 10.1073/pnas.2023421118
Entities
People
- Christopher D. Sewell
- Jian Li
- Likun Gao
- Mingyue Zhang
- Shuang Liang
- Xun Cui
- Yingjie Hu
- Zewei Wang
- Zhiqun Lin
- Zili Li
Organizations
- Air Force Office of Scientific Research
- China Scholarship Council
- Georgia Tech
- Nanjing Xiaozhuang University
- Northeast Forestry University