Journal
NATURE COMMUNICATIONS
Volume 8, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-00778-z
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Funding
- National Basic Research Program of China [2013CB934103, 2012CB933003]
- National Natural Science Foundation of China [51302203, 11525211, 51272197, 51502227]
- International Science & Technology Cooperation Program of China [2013DFA50840]
- Hubei Science Fund for Distinguished Young Scholars [2014CFA035]
- National Science Fund for Distinguished Young Scholars
- Fundamental Research Funds for the Central Universities [2013-ZD-7, 2014-YB-02]
- Australian Government
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The oxygen evolution reaction involves complex interplay among electrolyte, solid catalyst, and gas-phase and liquid-phase reactants and products. Monitoring catalysis interfaces between catalyst and electrolyte can provide valuable insights into catalytic ability. But it is a challenging task due to the additive solid supports in traditional measurement. Here we design a nanodevice platform and combine on-chip electrochemical impedance spectroscopy measurement, temporary I-V measurement of an individual nanosheet, and molecular dynamic calculations to provide a direct way for nanoscale catalytic diagnosis. By removing O-2 in electrolyte, a dramatic decrease in Tafel slope of over 20% and early onset potential of 1.344 V vs. reversible hydrogen electrode are achieved. Our studies reveal that O-2 reduces hydroxyl ion density at catalyst interface, resulting in poor kinetics and negative catalytic performance. The obtained in-depth understanding could provide valuable clues for catalysis system design. Our method could also be useful to analyze other catalytic processes.
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