Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 11, Issue 16, Pages 6691-6696Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.0c01943
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Funding
- China Ministry of Science and Technology [2017YFA0208300]
- Youth Innovation Promotion Association CAS [CX2310007007, CX2310000091]
- National Natural Science Foundation of China [21471143, 11621063]
- Fundamental Research Funds for the Central Universities [KY2310000020]
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Electrochemical water splitting in alkaline media is an attractive way to produce the clear and renewable hydrogen fuel H-2. In this work, we report a single-atom Fe-1/NC catalyst, where the Fe-N-x moiety works as the active site, for high-efficiency alkaline hydrogen evolution reaction (HER). The Fe-1/NC electrocatalyst exhibits a low overpotential of 111 mV at the current density of 10 mA cm(-2), with a Tafel slope of 86.1 mV dec(-1) in 1 M KOH solution. Operando X-ray absorption spectroscopy reveals that, under the working states, the Fe- support interaction weakened as the Fe-N coordination number and Fe oxidation state decreased. As such, the evolved single-atom Fe site with more d electrons provides a favorable structure for boosting HER performance. This work gives insight into the structural evolution of the active site under the alkaline HER and provides a strategy for the design of non-noble metal electrocatalysts.
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