Herein we present a novel multi-level structure of Fe-doped NiO coupled Ni cluster hollow nanotube arrays (Fe-NiO-Ni CHNAs) grown on carbon fiber cloth as an efficient catalyst for oxygen evolution reaction. In this multi-level structure, rocksalt-type Fe-doped NiO phase hybrids with Ni clusters coupled into the nanospheres anchored to the outside of nanotube, forming a unique 3D corn-like structure. This novel multi-level structure represents a large specific area for catalytic reaction. X-ray absorption fine structure indicates that the defect-rich Fe-doped NiO phase has abundant coordinative unsaturated sites as active sites, and Fe doping downshifts the d-band of metal sites, which is the main contribution to the improved oxygen evolution reaction catalytic activity. The OER of Fe-NiO-Ni CHNAs obeys the adsorbate evolution mechanism with the nonconcerted proton-electron transfer pathway as a rate-determining step. Thus Fe-doped NiO CHNAs exhibits excellent OER performance and outstanding durability that surpasses most of transition metal oxides.

在本文中，我们提出了一种新型的多级结构，在碳纤维布上生长的Fe掺杂的NiO偶联的Ni簇簇中空纳米管阵列（Fe-NiO-Ni CHNAs）作为一种有效的氧释放反应催化剂。在这种多级结构中，岩盐型铁掺杂的NiO相杂化物与Ni团簇耦合到锚定在纳米管外部的纳米球中，形成独特的3D玉米状结构。这种新颖的多级结构代表了催化反应的大比表面积。X射线吸收精细结构表明，富缺陷的Fe掺杂NiO相具有丰富的配位不饱和位点作为活性位点，Fe掺杂使金属位点的d带下移，这是改善氧析出反应催化性能的主要贡献。活动。Fe-NiO-Ni CHNAs的OER遵循吸附剂逸出机理，其中非确定性的质子电子转移途径是决定速率的步骤。因此，Fe掺杂的NiO CHNAs具有优异的OER性能和出色的耐久性，超过了大多数过渡金属氧化物。