Yang Yang, Zhu Bing, Guo Peng-Fei, Ding Tian-Yi, Yang Qian-Nan, Feng Wan-Xin, Jia Yan, Wang Kuan, Wang Wei-Tao, He Zhen-Hong, Liu Zhao-Tie
Key Laboratory of Chemical Additives for China National Light Industry, College of Chemistry and Chemical Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China.
State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
Inorg Chem. 2022 Oct 24;61(42):16805-16813. doi: 10.1021/acs.inorgchem.2c02706. Epub 2022 Oct 12.
Developing non-noble metal-based core-shell heterojunction electrocatalysts with high catalytic activity and long-lasting stability is crucial for the oxygen evolution reaction (OER). Here, we prepared novel core-shell Fe,V-NiSe@NiFe(OH) heterostructured nanoparticles on hydrophilic-treated carbon paper with high electronic transport and large surface area for accelerating the oxygen evolution rate high-temperature selenization and electrochemical anodic oxidation procedures. Performance testing shows that Fe,V-NiSe@NiFe(OH) possesses the highest performance for OER compared to as-prepared diselenide core-derived heterojunctions, which only require an overpotential of 243 mV at 10 mA cm and a low Tafel slope of 91.6 mV decade under basic conditions. Furthermore, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) confirm the morphology and elementary stabilities of Fe,V-NiSe@NiFe(OH) after long-term chronopotentiometric testing. These advantages are largely because of the strong synergistic effect between the Fe,V-NiSe core with high conductivity and the amorphous NiFe(OH) shell with enriched defects and vacancies. This study also presents a general approach to designing and synthesizing more active core-shell heterojunction electrocatalysts for OER.
开发具有高催化活性和持久稳定性的非贵金属基核壳异质结电催化剂对于析氧反应（OER）至关重要。在此，我们通过高温硒化和电化学阳极氧化程序，在具有高电子传输和大表面积的亲水处理碳纸上制备了新型核壳结构的Fe,V-NiSe@NiFe(OH)异质结构纳米颗粒，以加速析氧速率。性能测试表明，与所制备的二硒化物核衍生异质结相比，Fe,V-NiSe@NiFe(OH)对OER具有最高的性能，在碱性条件下，在10 mA cm时仅需要243 mV的过电位和91.6 mV dec⁻¹的低塔菲尔斜率。此外，X射线光电子能谱（XPS）和扫描电子显微镜（SEM）证实了Fe,V-NiSe@NiFe(OH)在长期计时电位测试后的形态和元素稳定性。这些优点很大程度上归因于具有高导电性的Fe,V-NiSe核与具有丰富缺陷和空位的非晶态NiFe(OH)壳之间的强协同效应。本研究还提出了一种设计和合成更具活性的用于OER的核壳异质结电催化剂的通用方法。
