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In-situ Growth of Ultrathin Ni-Fe LDHs Nanosheets for High Performance Oxygen Evolution Reaction


Layered double hydroxides (LDHs) are increasingly being recognized as one of the most promising candidates to lower the oxygen evolution reaction (OER) barriers in water splitting. However, how to further increase the catalytic active sites and then improve the corresponding catalytic activity is still a great challenge, which is critical to design an efficient OER electrocatalyst. Here, we present an in-situ growth of ultrathin Ni-Fe LDHs (u-Ni70Fe30 LDHs) nanosheet rich in catalytic active sites on the anodic polarized copper foil as an efficient electrocatalyst for OER through a mild electrodeposition approach(denoted as u-Ni70Fe30 LDHs/a-CF). We found that the u-Ni70Fe30 LDHs/a-CF shows a remarkable catalytic activity (the overpotential of 260 mV at 10 mA/cm-2) and the superior catalytic stability (beyond 50 h) in basic media. The achieved ultrahigh catalytic performance of u-Ni70Fe30 LDHs/a-CF is primarily attributed to its ultrathin nanosheet structure, the optimized 30 at% Fe-dopant concentration, and the synergetic effect between the nanosheets and the bumps on a-CF. These reasons lead to the high density of exposed active sites and the improved mass/electron transport capability. In comparison with the other developed LDHs based electrocatalysts to date, we provide a controllable and mild strategy for designing highly-efficient ultrathin LDHs based electrocatalysts with desirable kinetics for future large-scale application in water splitting.

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Publication details

The article was received on 28 Mar 2017, accepted on 11 May 2017 and first published on 12 May 2017

Article type:
DOI: 10.1039/C7QI00167C
Citation: Inorg. Chem. Front., 2017, Accepted Manuscript
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    In-situ Growth of Ultrathin Ni-Fe LDHs Nanosheets for High Performance Oxygen Evolution Reaction

    H. Yang, S. Luo, Y. Bao, Y. Luo, J. Jin and J. Ma, Inorg. Chem. Front., 2017, Accepted Manuscript , DOI: 10.1039/C7QI00167C

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