Exploring efficient and cheap electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is crucial for water splitting. Herein, novel porous disk-like nanostructured CoP (CoP NDs) were synthesized by a facile strategy involving precipitation, ammonia-etching and phosphidation steps. Endowed with abundant catalytically active sites and enriched nanoporosity, the CoP NDs show excellent bifunctional catalytic performances toward both HER and OER, which are comparable and even superior to those of the recently reported noble-metal-free electrocatalysts. Consequently, an efficent water electrolyzer composed of two symmetrical CoP ND electrodes can afford a current density of 10 mA cm⁻² at a cell voltage of 1.62 V.

中文翻译：

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磷化钴纳米盘作为双功能电催化剂的增强水分解的形成

对于氢分解反应（HER）和氧分解反应（OER），探索高效廉价的电催化剂对于水分解至关重要。本文中，通过包括沉淀，氨蚀刻和磷化步骤的简便策略合成了新颖的多孔盘状纳米结构CoP（CoP NDs）。CoP ND具有丰富的催化活性位点和丰富的纳米孔隙度，对HER和OER均显示出优异的双功能催化性能，这与最近报道的不含贵金属的电催化剂相当甚至更好。因此，由两个对称的CoP ND电极组成的高效水电解槽在电池电压为1.62 V时可提供10 mA cm ^-2的电流密度。