Electrocatalytic splitting of water to oxygen and hydrogen is one of the most promising approaches for sustainable production of hydrogen as a carbon-neutral fuel. To establish efficient electrocatalytic water splitting, the overall overpotential for this reaction must be minimized via developing efficient catalysts to promote oxygen and hydrogen evolution at the anode and the cathode, respectively. However, the overpotentials for oxygen evolution are insufficiently low (162–300 mV for a current density of 10 mA cm⁻²), and the value less than 100 mV still remains untracked. Here, we report the unprecedentedly low of 32 mV for oxygen evolution attained by the formation of a unique motif of nickel sulfide nanowires stuffed into carbon nitride scabbards (NiS_x/C₃N₄), demonstrating electrocatalytic water splitting at the lowest overall overpotential of 72 mV using the NiS_x/C₃N₄ anode. This motif provides a key to guided thought for the development of efficient catalysts for oxygen evolution.

中文翻译：

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通过塞入氮化碳鞘中的硫化镍纳米线以前所未有的低过电位进行电催化水分解

将水电催化分解为氧和氢是可持续生产氢作为碳中性燃料的最有前途的方法之一。为了建立有效的电催化水分解，必须通过开发有效的催化剂来分别促进阳极和阴极析氧和析氢，从而使该反应的整体过电位最小化。然而，析氧的过电位不够低（对于 10 mA cm ^-2的电流密度为 162-300 mV ），并且小于 100 mV的值仍未被追踪。在这里，我们报告前所未有的低通过形成填充到氮化碳鞘 (NiS _x /C ₃ N ₄ ) 中的硫化镍纳米线的独特图案而获得 32 mV 的氧析出率，证明使用 NiS _x /在 72 mV 的最低总过电位下进行电催化水分解C ₃ N ₄阳极。该主题为开发用于析氧的高效催化剂提供了指导思想的关键。