Transition metal-based nanomaterials represent an emerging class of highly active and low-cost precatalysts for the oxygen evolution reaction (OER) in alkaline electrolyzers. However, most OER precatalysts undergo slow or incomplete self-reconstructions to generate real active sites, which is a time-consuming process for achieving high OER performance. Thus, we report a new class of OER precatalysts that can achieve highly active OER species by a rapid and deep self-reconstruction (denoted by SELF-RECON). The precatalysts with a core-shell structure comprising NiMoO₄ (core) and NiFe/NiFeO_x nanoparticles in N-doped amorphous carbons (shell) (denoted by NiMoFeO@NC), can realize rapid MoO₄²⁻ dissolution and fast formation of NiOOH with Fe incorporation simultaneously. In situ Raman spectroscopy together with electron microscopy, X-ray photoelectron spectroscopy, and electrochemical tests indicate that the obtained NiFeOOH/NiFe-LDH after SELF-RECON behave as the real active species that outperform NiMoFeO@NC, with ultralow overpotentials and extraordinary long-term stability.

基于过渡金属的纳米材料代表了新兴的一类高活性和低成本的预催化剂，用于碱性电解槽中的氧释放反应（OER）。但是，大多数OER预催化剂会经历缓慢或不完全的自我重建，以生成真正的活性位点，这是获得高OER性能的耗时过程。因此，我们报告了一种新型的OER预催化剂，它可以通过快速和深度的自我重建（以SELF-RECON表示）来实现高活性的OER物种。在N掺杂无定形碳（壳）中由NiMoO ₄（核）和NiFe / NiFeO _x纳米颗粒组成的核-壳结构的预催化剂（以NiMoFeO @ NC表示）可以实现快速的MoO ₄ ^2-Fe的同时溶解和快速形成NiOOH。原位拉曼光谱，电子显微镜，X射线光电子能谱和电化学测试表明，在SELF-RECON之后获得的NiFeOOH / NiFe-LDH表现为比NiMoFeO @ NC更好的真正活性物质，具有超低的超电势和超长的电势。长期稳定性。