Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 143, Issue 35, Pages 14169-14177Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c04737
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Funding
- National Key Research and Development Program of China [2018YFA0209600]
- Science and Technology Key Project of Guangdong Province, China [2020B010188002]
- Guangdong Innovative and Entrepreneurial Research Team Program [2019ZT08L075]
- Foshan Innovative and Entrepreneurial Research Team Program [2018IT100031]
- Guangdong Pearl River Talent Program [2019QN01L054]
- Shenzhen Peacock Plan [KQTD2016053015544057]
- Nanshan Pilot Plan [LHTD20170001]
- Science and Technology Program of Guangzhou, China [202002030153]
- Guangdong Science and Technology Program [2017B030314002]
- National Natural Science Foundation of China [52000076, 22176063, 22106048]
- Natural Science Foundation of Guangdong Province [2021A1515010091]
- Fundamental Research Funds for the Central Universities
- MacDiarmid Institute for Advanced Materials and Nanotechnology
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The study presents a strategy of using quenching to modulate the surface chemistry of metal oxide nanocatalysts, leading to reduced overpotential for oxygen evolution reaction and improved activity. It is found that this strategy is also effective for other metal oxides, providing new insights for activating metal oxide catalysts.
Developing a reliable strategy for the modulation of the texture, composition, and electronic structure of electrocatalyst surfaces is crucial for electrocatalytic performance, yet still challenging. Herein, we develop a facile and universal strategy, quenching, to precisely tailor the surface chemistry of metal oxide nanocatalysts by rapidly cooling them in a salt solution. Taking NiMoO4 nanocatalysts an example, we successfully produce the quenched nanocatalysts offering a greatly reduced oxygen evolution reaction ( OER) overpotential by 85 mV and 135 mV at 10 mA cm(-2) and 100 mA cm(-2) respectively. Through detailed characterization studies, we establish that quenching induces the formation of numerous disordered stepped surfaces and the near-surface metal ions doping, thus regulating the local electronic structures and coordination environments of Ni, Mo, which promotes the formation of the dualsite active and thereby affords a low energy pathway for OER. This quenching strategy is also successfully applied to a number of other metal oxides, such as spinel-type Co3O4, Fe2O3, LaMnO3, and CoSnO3, with similar surface modifications and gains in OER activity. Our finding provides a new inspiration to activate metal oxide catalysts and extends the use of quenching chemistry in catalysis.
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