TY - JOUR AU - Qian, Guangfu AU - Chen, Jinli AU - Yu, Tianqi AU - Luo, Lin AU - Yin, Shibin PY - 2021/02/19 Y2 - 2024/03/28 TI - N-Doped Graphene-Decorated NiCo Alloy Coupled with Mesoporous NiCoMoO Nano-sheet Heterojunction for Enhanced Water Electrolysis Activity at High Current Density JF - Nano-Micro Letters JA - Nano-Micro Lett VL - 13 IS - SE - Articles DO - 10.1007/s40820-021-00607-5 UR - https://nmlett.org/index.php/nml/article/view/842 SP - 77 AB - <p>Developing highly effective and stable non-noble metal-based bifunctional catalyst working at high current density is an urgent issue for water electrolysis (WE). Herein, we prepare the N-doped graphene-decorated NiCo alloy coupled with mesoporous NiCoMoO nano-sheet grown on 3D nickel foam (NiCo@C-NiCoMoO/NF) for water splitting. NiCo@C-NiCoMoO/NF exhibits outstanding activity with low overpotentials for hydrogen and oxygen evolution reaction (HER: 39/266&nbsp;mV; OER: 260/390&nbsp;mV) at ± 10 and ± 1000&nbsp;mA&nbsp;cm<sup>−2</sup>. More importantly, in 6.0&nbsp;M KOH solution at 60&nbsp;°C for WE, it&nbsp;only requires 1.90&nbsp;V to reach 1000&nbsp;mA&nbsp;cm<sup>−2</sup> and shows excellent stability for 43&nbsp;h, exhibiting the potential for actual application. The good performance can be assigned to N-doped graphene-decorated NiCo alloy and mesoporous NiCoMoO nano-sheet, which not only increase the intrinsic activity and expose abundant catalytic activity sites, but also enhance its chemical and mechanical stability. This work thus could provide a promising material for industrial hydrogen production.</p><p>Highlights:</p><p>1 N-doped graphene-coated structure and mesoporous nano-sheet can efficiently boost active sites and stability for hydrogen and oxygen evolution reaction.<br>2 NiCo@C-NiCoMoO/NF exhibits low overpotentials for HER (266 mV) and OER (390 mV) at ± 1000 mA cm<sup>−2</sup>.<br>3 For water electrolysis, it can hold at 1000 mA cm<sup>−2</sup> for 43 h in 6.0 M KOH + 60 °C condition.</p> ER -