Electrodeposition of hierarchically structured three-dimensional nickel-iron electrodes for efficient oxygen evolution at high current densities.
Electrodeposition of hierarchically structured three-dimensional nickel-iron electrodes for efficient oxygen evolution at high current densities.
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DOI：
10.1038/ncomms7616
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发表时间：
2015-03-17
影响因子：
16.6
通讯作者：
Zhao, Chuan
中科院分区：
文献类型：
--
作者：
Lu, Xunyu;Zhao, Chuan
电解分解水的大规模工业应用要求开发廉价、坚固并且可以在低施加电位下提供大电流密度（>500 mA cm-2）的析氧电极。在这里，我们表明，一个有效的氧电极可以通过电沉积无定形介孔镍-铁复合纳米片直接到大孔泡沫镍基板。所制备的氧电极对碱性溶液中的水氧化表现出高催化活性，其仅需要200 mV的过电位来引发反应，并且能够分别在240和270 mV的过电位下提供500和1，000 mA cm-2的电流密度。该电极还显示出在大电流下对本体水电解的延长的稳定性。总的来说，所制备的三维结构化电极是据我们所知在碱性电解质中最有效的析氧电极，并且可以潜在地应用于工业规模的水电解。 开发高效、经济的析氧催化剂对大规模电解水裂解至关重要。在这里，作者报道了负载在大孔泡沫镍基底上的介孔镍-铁复合纳米片，并评估了它们在碱性介质中的电催化析氧。
Large-scale industrial application of electrolytic splitting of water has called for the development of oxygen evolution electrodes that are inexpensive, robust and can deliver large current density (>500 mA cm−2) at low applied potentials. Here we show that an efficient oxygen electrode can be developed by electrodepositing amorphous mesoporous nickel–iron composite nanosheets directly onto macroporous nickel foam substrates. The as-prepared oxygen electrode exhibits high catalytic activity towards water oxidation in alkaline solutions, which only requires an overpotential of 200 mV to initiate the reaction, and is capable of delivering current densities of 500 and 1,000 mA cm−2 at overpotentials of 240 and 270 mV, respectively. The electrode also shows prolonged stability against bulk water electrolysis at large current. Collectively, the as-prepared three-dimensional structured electrode is the most efficient oxygen evolution electrode in alkaline electrolytes reported to the best of our knowledge, and can potentially be applied for industrial scale water electrolysis. Development of efficient and affordable oxygen evolution catalysts is essential for large-scale electrolytic water splitting. Here, the authors report mesoporous nickel–iron composite nanosheets loaded on macroporous nickel foam substrates, and evaluate their electrocatalytic oxygen evolution in basic media.
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