A high-performance transition-metal phosphide electrocatalyst for converting solar energy into hydrogen at 19.6% STH efficiency,Carbon Energy

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A high-performance transition-metal phosphide electrocatalyst for converting solar energy into hydrogen at 19.6% STH efficiency
Carbon Energy ( IF 19.5 ) Pub Date : 2022-06-09 , DOI: 10.1002/cey2.217
Hua Zhang ₁ , Abuduwayiti Aierke ₂ , Yingtang Zhou ₃ , Zitao Ni ₁ , Ligang Feng ₄ , Anran Chen ₁ , Thomas Wågberg ₅ , Guangzhi Hu _{1,

5}

Affiliation

The construction of high-efficiency and low-cost non-noble metal bifunctional electrocatalysts for water electrolysis is crucial for commercial large-scale application of hydrogen energy. Here, we report a novel strategy with erbium-doped NiCoP nanowire arrays in situ grown on conductive nickel foam (Er-NiCoP/NF). Significantly, the developed electrode shows exceptional bifunctional catalytic activity, which only requires overpotentials of 46 and 225 mV to afford a current density of 10 mA cm⁻² for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), respectively. Density functional theory calculations reveal that the appropriate Er incorporation into the NiCoP lattice can significantly modulate the electronic structure with the d-band centers of Ni and Co atoms by shifting to lower energies with respect to the Fermi level, and optimize the Gibbs free energies of HER/OER intermediates, thereby accelerating water-splitting kinetics. When assembled as a solar-driven overall water-splitting electrolyzer, the as-prepared electrode shows a high and stable solar-to-hydrogen efficiency of 19.6%, indicating its potential for practical storage of intermittent energy.

中文翻译：

一种高性能过渡金属磷化物电催化剂，用于以 19.6% STH 效率将太阳能转化为氢气

构建高效、低成本的非贵金属双功能水电解电催化剂对于氢能的商业化大规模应用至关重要。在这里，我们报告了一种在导电泡沫镍 (Er-NiCoP/NF) 上原位生长掺铒 NiCoP 纳米线阵列的新策略。值得注意的是，开发的电极显示出卓越的双功能催化活性，仅需要 46 和 225 mV 的过电势即可提供 10 mA cm ^{-2的电流密度}分别用于析氢反应（HER）和析氧反应（OER）。密度泛函理论计算表明，适当的 Er 掺入 NiCoP 晶格可以通过相对于费米能级转移到较低能量来显着调制具有 Ni 和 Co 原子 d 带中心的电子结构，并优化 Gibbs 自由能HER/OER 中间体，从而加速水分解动力学。当组装成太阳能驱动的整体水分解电解槽时，所制备的电极显示出 19.6% 的高且稳定的太阳能制氢效率，表明其具有实际储存间歇性能量的潜力。

更新日期：2022-06-09

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