Self-Regulated Surface Reconstruction of Fe Modified Nickel Tellurium Oxides Enabling Highly Efficient and Durable Oxygen Evolution

en This link goes to a English section zh This link goes to a Chinese section Improving the efficiency and stability of oxygen evolution electrocatalysts remains essential for advancing water splitting technologies. Although in situ surface reconstruction into active phases is desirable, it often leads to uncontrolled structural degradation. Herein, we demonstrate that lattice doping of Fe into Ni 2 Te 3 O 8 (NTO) pre-catalysts triggers a self-terminating surface reconstruction during OER. The deliberate incorporation of Fe introduced a higher density of unsaturated surface coordination sites and weakened the local surface crystallinity, which collectively accelerated the oxidative transformation of the NTO into an oxyhydroxide-rich active layer during electrocatalysis. During the reconstructive process, soluble tellurium species released from the host framework spontaneously adsorbed onto the evolving surface and subsequently served as stabilizing anionic units, contributing to the structural integrity of the metastable oxyhydroxide phase. Benefiting from this self-terminating mechanism, the optimized Fe-NTO catalyst exhibited remarkable oxygen evolution activity, requiring only 220 mV of overpotential to deliver a current density of 50 mA cm −2 , along with exceptional operational durability exceeding 200 h at the same current. This work highlights the critical role of doping and anionic regulation in controlling reconstruction dynamics and establishes a novel paradigm for designing durable, high-performance electrocatalysts. 摘要 en This link goes to a English section zh This link goes to a Chinese section 提升析氧反应(OER)电催化剂的效率与稳定性对推进水分解技术发展至关重要。尽管原位表面重构能够生成高活性相,但其过程常伴随不可控的结构衰退。本文报道,在Ni 2 Te 3 O 8 (NTO)预催化剂中晶格掺杂铁,可在OER过程中触发自终止的表面重构。Fe的引入增加了不饱和配位位点密度并降低了表面晶格有序性,共同促进了NTO在电催化过程中向富含羟基氧化物的高活性表面层转化。在重构过程中,从主体骨架释放的可溶性碲物种自发吸附于动态演化的表面,并作为稳定阴离子单元,有效增强了亚稳态羟基氧化物相的结构完整性。得益于该自终止机制,优化后的Fe-NTO催化剂表现出卓越的析氧性能,仅需220 mV过电位即可实现50 mA cm −2 的电流密度,并在该电流下保持超过200小时的持续稳定运行。本研究揭示了掺杂与阴离子调控在控制表面重构动力学中的关键作用,为设计高性能、长寿命电催化剂提供了新思路。