Exploring materials with regulated local structures and understanding how the atomic motifs govern the reactivity and durability of catalysts are a critical challenge for designing advanced catalysts. Herein we report the tuning of the local atomic structure of nickel–iron layered double hydroxides (NiFe-LDHs) by partially substituting Ni2+ with Fe2+ to introduce Fe-O-Fe moieties. These Fe2+-containing NiFe-LDHs exhibit enhanced oxygen evolution reaction (OER) activity with an ultralow overpotential of 195 mV at the current density of 10 mA cm−2, which is among the best OER catalytic performance to date. In-situ X-ray absorption, Raman, and electrochemical analysis jointly reveal that the Fe-O-Fe motifs could stabilize high-valent metal sites at low overpotentials, thereby enhancing the OER activity. These results reveal the importance of tuning the local atomic structure for designing high efficiency electrocatalysts.
|Number of pages||5|
|Journal||Angewandte Chemie - International Edition|
|Publication status||Published - 2018 Jul 20|
Bibliographical noteFunding Information:
This study was supported by the Natural Science Foundation of China, the Program for Changjiang Scholars and Innovative Research Team in the University, and the long-term subsidy mechanism from the Ministry of Finance and the Ministry of Education of P. R. China. The work at Broo-khaven National Laboratory (BNL) was supported by the U.S. Department of Energy, the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Vehicle Technologies under Contract Number DE-SC0012704. Z.F. thanks the Callahan Faculty Scholar Endowment Fund from Oregon State University. XAS measurements were performed at 9-BM of Advanced Photon Source (APS), Argonne National Laboratory (ANL). The use of APS of ANL is supported by DOE under Contract No. DE-AC02-06CH11357.
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