The simultaneous integration of electronic regulation and architectural engineering in one electrocatalyst represents a powerful leverage to concurrently boost the electrocatalytic performance towards overall water splitting. We herein rationally fabricate Sn₄P₃/Co₂P “stalk”-“cap”-typed nanoarrays (Sn₄P₃/Co₂P SCNAs) with abundant heterointerfaces and elaborately implanted “caps”. The nanoarrayed structure can substantially enlarge the exposure of active sites and promote the mass/electron transport, thus accelerating the reaction kinetics. Moreover, the purposely grafted “caps” are beneficial to increase the hydrophilicity/aerophobicity, which facilitate the water affinity and release of generated gas bubbles. Accordingly, the obtained Sn₄P₃/Co₂P SCNAs deliver exceptional electrocatalytic performances towards the HER and OER, as reflected by the overpotentials of 45.4 and 280.4 mV at 10 mA cm^-2, respectively. More impressively, the two-electrode electrolyzer assembled by freestanding Sn₄P₃/Co₂P SCNAs requires a cell voltage of 1.56 V at 10 mA cm^-2 and exhibits superior stability and full reversibility, holding great potential in practical water electrolysis.

在一个电催化剂中同时集成电子调节和建筑工程代表了一种强大的杠杆作用，可以同时提高电催化性能以实现整体水分解。我们在此合理地制造了 Sn ₄ P ₃ /Co ₂ P“茎”-“帽”型纳米阵列（Sn ₄ P ₃ /Co ₂P SCNA）具有丰富的异质界面和精心植入的“帽”。纳米阵列结构可以显着扩大活性位点的暴露并促进质量/电子传输，从而加速反应动力学。此外，特意接枝的“帽”有利于增加亲水性/疏气性，这有利于水的亲和力和产生的气泡的释放。因此，所获得的 Sn ₄ P ₃ /Co ₂ P SCNA 对 HER 和 OER 具有出色的电催化性能，这分别由 10  mA  cm ^-2下的 45.4 mV和 280.4 mV过电位反映出来。更令人印象深刻的是，由独立式 Sn ₄组装的双电极电解槽P ₃ /Co ₂ P SCNA 在 10  mA  cm ^{-2 下}需要 1.56 V的电池电压，并表现出优异的稳定性和完全可逆性，在实际水电解中具有巨大潜力。