NiFe-layered double hydroxide (NiFe LDH) is a state-of-the-art oxygen evolution reaction (OER) electrocatalyst, yet it suffers from rather poor catalytic activity for the hydrogen evolution reaction (HER) due to its extremely sluggish water dissociation kinetics, severely restricting its application in overall water splitting. Herein, we report a novel strategy to expedite the HER kinetics of NiFe LDH by an Ir⁴⁺-doping strategy to accelerate the water dissociation process (Volmer step), and thus this catalyst exhibits superior and robust catalytic activity for finally oriented overall water splitting in 1 M KOH requiring only a low initial voltage of 1.41 V delivering at 20 mA cm⁻² for more than 50 h.

中文翻译：

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Ir ⁴⁺掺杂的NiFe LDH可加速氢分解动力学，作为一种Pt状的水分解电催化剂†

NiFe层状双氢氧化物（NiFe LDH）是最先进的析氧反应（OER）电催化剂，但由于其极慢的水分解动力学，因此对析氢反应（HER）的催化活性相当差，严重限制了其在总水分解中的应用。本文中，我们报告了一种新的策略，该方法通过Ir ⁴⁺掺杂策略加速NiFe LDH的HER动力学，从而加速了水的离解过程（沃尔默步骤），因此该催化剂对于最终定向的总水分解显示出优异而强大的催化活性。在1 M KOH中，仅需要1.41 V的低初始电压即可在20 mA cm ^-2的条件下传输50小时以上。