Electrochemical water splitting into H₂ and O₂ provides a promising and sustainable strategy for the future production of clean energy. Herein, we report an ammonium nitrate (AN)‐assisted synthetic strategy to prepare Co, Co₂P@CoP nanoparticles embedded in biomass‐derived porous carbons as bifunctional electrodes for water splitting. The use of AN is not only activating biomass to porous carbons, but also reducing the synthetic temperature significantly. The synergistic effects of the Co₂P@CoP heterostructure could lead to a low adsorption energy of hydrogen (ΔG_H*) and conduction band bending, together with the N/S‐codoped porous carbons could provide large specific surface area and desirable electron‐donating feature, contribute to the remarkable performance with overpotentials of 0.129 and 0.212 V for hydrogen evolution reaction (HER) in 0.5 mol L⁻¹ H₂SO₄ and 1 mol L⁻¹ KOH, and 0.328 V for oxygen evolution reaction (OER) in 1 mol L⁻¹ KOH, at a current density of 10 mA cm⁻². Moreover, the Co₂P@CoP/PC catalysts enable overall water splitting with a small cell voltage of 1.63 V to achieve 10 mA cm⁻² and exhibit long‐term durability over 1000 min.

中文翻译：

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硝酸铵辅助低温合成生物质衍生碳中埋藏的Co，Co2P @ CoP，作为氢和氧释放反应的高效电催化剂

分解为H ₂和O _2的电化学水为未来清洁能源的生产提供了一种有希望且可持续的策略。本文中，我们报道了硝酸铵（AN）辅助的合成策略，以制备嵌入生物质衍生的多孔碳中的Co，Co ₂ P @ CoP纳米颗粒，作为双功能电极用于水分解。AN的使用不仅将生物质活化为多孔碳，而且还显着降低了合成温度。Co ₂ P @ CoP异质结构的协同效应可能导致氢的低吸附能（ΔGH _*）和导带弯曲，再加上N / S掺杂的多孔碳，可提供较大的比表面积和理想的给电子特征，从而在0.5的氢气释放反应（HER）中具有0.129和0.212 V的超电势，从而提供了卓越的性能mol L ^-1 H ₂ SO ₄和1 mol L ^-1 KOH，以及0.328 V的氧气逸出反应（OER）在1 mol L ^-1 KOH中，电流密度为10 mA cm ^-2。此外，Co ₂ P @ CoP / PC催化剂可在1.63 V的小电池电压下实现整体水分解，从而达到10 mA cm ^{-2的性能，}并在1000分钟内表现出长期耐久性。