期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 140, 期 11, 页码 3876-3879出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b00752
关键词
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资金
- National Natural Science Foundation of China [21422104]
- National key research and development program [2016YFB0901600]
- Natural Science Foundation of Tianjin City [17JCJQJC44700, 16JCZDJC30600]
- Helmholtz Association [VH-NG-1140]
A fundamental understanding of the origin of oxygen evolution reaction (OER) activity of transition metal-based electrocatalysts, especially for single precious metal atoms supported on layered double hydroxides (LDHs), is highly required for the design of efficient electrocatalysts toward further energy conversion technologies. Here, we aim toward single-atom Au supported on NiFe LDH (Au-s/NiFe LDH) to clarify the activity origin of LDHs system and a 6-fold OER activity enhancement by 0.4 wt % Au-s decoration. Combining with theoretical calculations, the active behavior of NiFe LDH results from the in situ generated NiFe oxyhydroxide from LDH during the OER process. With the presence of Au-s, Au-s/NiFe LDH possesses an overpotential of 0.21 V in contrast to the calculated result (0.18 V). We ascribe the excellent OER activity of sAu/NiFe LDH to the charge redistribution of active Fe as well as its surrounding atoms causing by the neighboring Au-s on NiFe oxyhydroxide stabilized by interfacial CO32- and H2O interfacing with LDH.
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