Transition metal phosphides and oxides are heralded as inexpensive alternatives to precious metal catalysts for the electrochemical hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), respectively. Combing both transition metal phosphides and oxides into one catalyst system can generate a bifunctional electrocatalyst for overall water splitting. Still, the synthesis of such a catalyst has always been very challenging. Herein, we report the synthesis of Cu₃P-Cu₂O Janus bifunctional catalysts into a N, P co-doped 3D hierarchically porous carbon framework (Cu₃P-Cu₂O/NPC). Simple carbonization of Cu²⁺-containing ion-exchange resins with KOH make hundred-gram scale production of this superior catalyst possible. The Janus Cu₃P-Cu₂O heterostructure within a N, P-doped hierarchically porous carbon framework provides increased mass transport, enhanced electrocatalytic activity, and promoted cycling durability. As an electrocatalyst, the designed Cu₃P-Cu₂O/NPC delivers superior bifunctional activity for both the HER and OER in 1 M KOH, including extremely low overpotentials (138 mV for HER and 286 mV for OER) to reach a current density of 10 mA cm⁻² and small Tafel slopes (62.64 mV dec^-1 for HER and 79.02 mV dec^-1 for OER). More impressively, the Cu₃P-Cu₂O/NPC-assembled electrolyzer needs drive voltages of only approximately 1.57 and 1.81 V to achieve current densities of 10 and 50 mV cm⁻², respectively, demonstrating a superior electrocatalytic activity compared to the state-of-the-art electrolyzer (Pt/C || RuO₂/C), and exhibits ultrahigh stability over a week of continuous overall water splitting reaction. This work highlights the significance of nanoengineering on the production of highly efficient electrocatalysts and provides a promising bifunctional electrocatalyst for future industrial implementation.

过渡金属磷化物和氧化物被誉为分别用于电化学析氢反应 (HER) 和析氧反应 (OER) 的贵金属催化剂的廉价替代品。将过渡金属磷化物和氧化物结合到一个催化剂体系中，可以产生一种用于整体水分解的双功能电催化剂。尽管如此，这种催化剂的合成一直非常具有挑战性。在此，我们报道了将 Cu ₃ P-Cu ₂ O Janus 双功能催化剂合成为 N、P 共掺杂的 3D 分层多孔碳框架（Cu ₃ P-Cu ₂ O/NPC）。Cu ^{2+ 的}简单碳化含有 KOH 的离子交换树脂使这种优质催化剂的百克规模生产成为可能。在 N、P 掺杂的分级多孔碳框架内的 Janus Cu ₃ P-Cu ₂ O 异质结构提供了增加的传质、增强的电催化活性和提高的循环耐久性。作为电催化剂，设计的 Cu ₃ P-Cu ₂ O/NPC 在 1 M KOH 中为 HER 和 OER 提供了卓越的双功能活性，包括极低的过电位（HER 为 138 mV，OER 为 286 mV）以达到电流密度为10mA厘米^-2和小塔菲尔斜率（62.64毫伏癸^-1为HER和79.02毫伏癸^-1为OER）。更令人印象深刻的是，Cu₃ P-Cu ₂ O/NPC 组装的电解槽只需要大约 1.57 V 和 1.81 V 的驱动电压即可分别实现 10 和 50 mV cm ^{-2 的}电流密度，与目前的状态相比，显示出优异的电催化活性。 art 电解槽 (Pt/C || RuO ₂ /C)，在连续一周的整体水分解反应中表现出超高的稳定性。这项工作突出了纳米工程对生产高效电催化剂的重要性，并为未来的工业应用提供了一种有前途的双功能电催化剂。