Developing highly efficient, low-cost, and multifunctional electro-catalysts to replace noble metals is of significant importance for energy storage and conversion systems. Herein, we demonstrate a facile strategy for the preparation of CoP quantum dots (QDs) embedded in S,N-codoped graphite carbon (CoP@SNC) by using organophosphoric acid as both phosphorus and carbon sources. Benefiting from the strong coupling and synergistic effect between CoP QDs and highly conductive S,N-codoped carbon, well-structured porosity and high specific surface area, the resulting CoP@SNC exhibits excellent activities for oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and oxygen reduction reaction (ORR), making it a trifunctional electro-catalyst for overall water splitting and rechargeable Zn–air batteries. When CoP@SNC is used for overall water splitting, a cell voltage as low as 1.64 V is required to reach the current density of 10 mA cm⁻²; the obtained rechargeable Zn–air battery with CoP@SNC as the air cathode exhibits a high open-circuit voltage of 1.45 V, a very low discharge-charge voltage gap (0.83 V at 10 mA cm⁻²), and a long cycle life (up to 180 cycles). This work not only offers a new strategy for the synthesis of CoP@SNC but also presents its huge potential as a trifunctional electro-catalyst for clean energy systems.

中文翻译：

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源自有机磷酸的CoP量子点@ S，N掺杂的石墨碳，作为用于整体水分解和Zn-空气电池的三功能电催化剂†

开发高效，低成本和多功能的电催化剂来替代贵金属对能量存储和转换系统具有重要意义。在这里，我们展示了一种通过使用有机磷酸作为磷和碳源来制备嵌入在S，N掺杂的石墨碳（CoP @ SNC）中的CoP量子点（QD）的简便策略。得益于CoP QD与高导电性S，N掺杂碳之间的强耦合和协同作用，结构良好的孔隙率和高比表面积，所得CoP @ SNC对氧释放反应（OER），氢释放反应具有出色的活性（HER）和氧还原反应（ORR），使其成为用于整体水分解和可充电Zn-空气电池的三功能电催化剂。⁻² ; 所获得的以CoP @ SNC作为空气阴极的Zn-空气二次电池具有1.45 V的高开路电压，极低的充放电电压间隙（在10 mA cm ^-2时为0.83 V）和较长的循环寿命（最多180个周期）。这项工作不仅为CoP @ SNC的合成提供了新的策略，而且还展示了其作为清洁能源系统的三功能电催化剂的巨大潜力。