We report a facile way to prepare sulfur (S) doped Ni4/5Fe1/5-layered double hydroxide (LDH) electrocatalysts for oxygen evolution reaction (OER). The influence of S doping amount on the OER activity of the resulted NiFe-LDHs was studied and the optimal surface S content was ca. 0.43 at%. The developed S-doped NiFe-LDH exhibits excellent OER catalyst activity in 1.0 M KOH with overpotential of only 257 mV at the current density of 10 mA cm-2. Moreover, the catalyst could maintain high activity after 30 h stability test. The high activity of the S-doped NiFe-LDH catalysts may originate from the synergistic effect between S and the Fe sites. This work provides a simple but efficient way to improve the OER performance of transition metal oxides/(oxy)hydroxides.

中文翻译：

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通过硫掺杂调节 NiFe 层状双氢氧化物的析氧电催化

我们报告了一种简便的方法来制备用于析氧反应 (OER) 的硫 (S) 掺杂的 Ni4/5Fe1/5 层双氢氧化物 (LDH) 电催化剂。研究了S掺杂量对所得NiFe-LDHs的OER活性的影响，最佳表面S含量约为。0.43%。开发的 S 掺杂 NiFe-LDH 在 1.0 M KOH 中表现出优异的 OER 催化剂活性，在 10 mA cm-2 的电流密度下过电位仅为 257 mV。此外，催化剂在30小时稳定性测试后仍能保持高活性。S掺杂的NiFe-LDH催化剂的高活性可能源于S和Fe位点之间的协同作用。这项工作提供了一种简单但有效的方法来提高过渡金属氧化物/（羟基）氢氧化物的 OER 性能。