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首页> 外文期刊>Energy & environmental science >Exceptional performance of hierarchical Ni–Fe oxyhydroxide@NiFe alloy nanowire array electrocatalysts for large current density water splitting
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Exceptional performance of hierarchical Ni–Fe oxyhydroxide@NiFe alloy nanowire array electrocatalysts for large current density water splitting

机译：Ni-Fe羟基氢氧化物@NiFe合金纳米线阵列电催化剂在大电流密度水分解中的优异性能

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摘要

Water electrolysis represents a promising sustainable hydrogen production technology. However, in practical application which requires extremely large current densities (>500 mA cm(-2)), the oxygen evolution reaction (OER) becomes unstable and kinetically sluggish, which is a major hurdle to large-scale hydrogen production. Herein, we report an exceptionally active and binder-free NiFe nanowire array based OER electrode that allows durable water splitting at current densities up to 1000 mA cm(-2) up to 120 hours. Specifically, NiFe oxyhydroxide (shell)-anchored NiFe alloy nanowire (core) arrays are prepared via a magnetic-field-assisted chemical deposition method. The ultrathin (1-5 nm) and amorphous NiFe oxyhydroxide is in situ formed on the NiFe alloy nanowire surface, which is identified as an intrinsically highly active phase for the OER. Additionally, the fine geometry of the hierarchical electrode can substantially improve charge and mass (reactants and oxygen bubbles) transfer. In an alkaline electrolyte, this OER electrode can yield current densities of 500 and 1000 mA cm(-2) stably over 120 hours at overpotentials of only 248 mV and 258 mV respectively, which are dramatically lower than any recently reported overpotentials. Notably, the integrated alkaline electrolyzer (with pure Ni nanowires as HER electrode) is demonstrated to reach the current density of 1000 mA cm(-2) with super low voltage of 1.76 V, outperforming the state-of-the-art industrial catalysts. Our result may represent a critical step towards an industrial electrolyzer for large-scale hydrogen production by water splitting.
机译：水电解代表了一种有前途的可持续制氢技术。但是，在需要极高电流密度（> 500 mA cm（-2））的实际应用中，析氧反应（OER）变得不稳定且动力学缓慢，这是大规模制氢的主要障碍。在此，我们报告了一种基于OER电极的极活泼且无粘结剂的NiFe纳米线阵列，该电极可以在120个小时的电流密度下以1000 mA cm（-2）的电流进行持久的水分解。具体地，通过磁场辅助化学沉积方法制备NiFe羟基氧化物（壳）-锚定的NiFe合金纳米线（芯）阵列。在NiFe合金纳米线表面上原位形成了超薄（1-5 nm）和非晶态的NiFe羟基氧化物，这被确定为OER固有的高活性相。另外，分级电极的精细几何形状可以显着改善电荷和质量（反应物和氧气泡）的转移。在碱性电解质中，此OER电极可在120小时内稳定地以分别仅248 mV和258 mV的过电势产生500和1000 mA cm（-2）的电流密度，这远低于最近报道的过电势。值得注意的是，集成碱性电解槽（使用纯Ni纳米线作为HER电极）被证明在1.76 V的超低电压下可达到1000 mA cm（-2）的电流密度，优于最先进的工业催化剂。我们的结果可能代表朝着通过水分解大规模生产氢的工业电解槽迈出的关键一步。

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