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A three-dimensional nickel–chromium layered double hydroxide micro/nanosheet array as an efficient and stable bifunctional electrocatalyst for overall water splitting

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Abstract

The development of bifunctional and stable non-noble metal electrocatalysts for the high-performance hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is very important and challenging for renewable energy. Herein, for the first time, a nickel–chromium layered double hydroxide (NiCr-LDH) nanosheet array was developed as a bifunctional electrocatalyst towards overall water splitting. By tuning different Ni/Cr ratios of LDHs, the optimized Ni2Cr1-LDH shows extraordinary HER activity with an ultralow overpotential of 138 mV at 100 mA cm−2, compared with all of the reported Ni-based LDHs (NiFe-LDH, NiCo-LDH, NiMn-LDH, NiTi-LDH, NiV-LDH etc.) and even outperforming Pt/C catalysts. The small overpotential of 319 mV at 100 mA cm−2 for the OER and outstanding durability at 1.55 V (vs. RHE) for 30 hours can also be achieved for Ni2Cr1-LDH. Notably, a two-electrode electrolyzer with a Ni2Cr1-LDH bifunctional electrocatalyst as both the anode and the cathode can work for at least 30 hours with a cell voltage of merely 1.55 V at 10 mA cm−2. Both experimental and density functional theoretical calculations show that the Cr3+ ions within the LDH layer serve as charge transfer sites and thus effectively boost the intrinsic electrochemical activity. Therefore, this work provides a new NiCr-LDH system as a more efficient metal hydroxide for bifunctional water splitting electrocatalyst.

Graphical abstract: A three-dimensional nickel–chromium layered double hydroxide micro/nanosheet array as an efficient and stable bifunctional electrocatalyst for overall water splitting

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Publication details

The article was received on 24 Jul 2018, accepted on 24 Sep 2018 and first published on 27 Sep 2018


Article type: Paper
DOI: 10.1039/C8NR05974H
Citation: Nanoscale, 2018, Advance Article
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    A three-dimensional nickel–chromium layered double hydroxide micro/nanosheet array as an efficient and stable bifunctional electrocatalyst for overall water splitting

    W. Ye, X. Fang, X. Chen and D. Yan, Nanoscale, 2018, Advance Article , DOI: 10.1039/C8NR05974H

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