Anion defects have been utilized to regulate the active sites in the electrocatalytic. Herein, we report a simple NaBH₄ reduction tactic to design a novel CoP nanorods electrocatalyst with phosphorus vacancy (Pv) and discuss the effect of Pv content on its oxygen evolution reaction (OER) performance. It is proved that phosphate formed by filling Pv with oxygen is the key factor affecting the activity of catalyst. CoP with appropriate quantity Pvs have excellent OER activity, including lower overpotential (297 mV at 10 mA cm⁻²), excellent cyclicity (almost no change after 1000 cycles), good stability (small decay after 11 h) and a lower Tafel slope (58.1 mV dec^-1). The excessive Pvs will hinder the formation of phosphate, thus affecting CoO_x(OH)_y active center production and ultimately reducing the OER performance of the catalyst. This study offers a valuable insight to design OER catalysts with anion vacancy defects.

阴离子缺陷已被用来调节电催化中的活性位。本文中，我们报告了一种简单的NaBH ₄还原策略，以设计具有磷空位（Pv）的新型CoP纳米棒电催化剂，并讨论了Pv含量对其氧释放反应（OER）性能的影响。事实证明，用氧气填充Pv形成的磷酸盐是影响催化剂活性的关键因素。具有适量Pvs的CoP具有优异的OER活性，包括较低的过电势（在10 mA cm ^-2时为297 mV ），出色的循环性（在1000次循环后几乎没有变化），良好的稳定性（在11 h后衰减很小）和较低的Tafel斜率（ 58.1 mV dec ^-1）。过量的Pvs将阻碍磷酸盐的形成，从而影响CoO _x（OH）_ý活性中心的生产和最终降低了催化剂的性能OER。该研究为设计具有阴离子空位缺陷的OER催化剂提供了宝贵的见识。