Searching for ideal candidates with high electrocatalytic performance for both HER and OER is a major objective to realize the large-scale H₂ production by seawater electrolysis. Herein, we report delicate, heterostructured NiTe-NiCoN and NiTe-NiFeN electrocatalysts, which exhibit outstanding HER and OER performance, respectively. Impressively, the NiTe-NiCoN || NiTe-NiFeN couples in alkaline seawater solution delivered 400 mA cm⁻² at 1.84 V along with long-term stability. Further analysis has revealed that not only heterogeneous interface engineering ensures exposure of abundant active sites and faster electron-mass transfer, but also induces electron modulation that optimizes the absorption/desorption for the reaction intermediates to enhanced the intrinsic activity. Notably, a high electric field intensity generated by the nanosheet-nanorod structure induces a local “hydroxide enrichment” environment that promotes the OER kinetics. This work shed lights on these novel heterostructured electrocatalysts with strong synergy, while demonstrating the key role of the unique nanostructures in high-efficiency seawater electrolysis.

寻找对HER和OER均具有高电催化性能的理想候选物是实现海水电解大规模生产H _{2的主要目标。}在这里，我们报告了精细的异质结构 NiTe-NiCoN 和 NiTe-NiFeN 电催化剂，它们分别表现出出色的 HER 和 OER 性能。令人印象深刻的是，NiTe-NiCoN || NiTe-NiFeN 偶合在碱性海水中提供 400 mA cm ^-2在 1.84 V 以及长期稳定性。进一步的分析表明，异质界面工程不仅确保了丰富的活性位点的暴露和更快的电子-质量转移，而且还诱导了电子调制，优化了反应中间体的吸收/解吸，从而增强了内在活性。值得注意的是，由纳米片-纳米棒结构产生的高电场强度会诱导局部“氢氧化物富集”环境，从而促进 OER 动力学。这项工作揭示了这些具有强协同作用的新型异质结构电催化剂，同时展示了独特的纳米结构在高效海水电解中的关键作用。