高性能电催化析氧催化剂氧化钌的设计

The Design of High-performance Ruthenium Oxide Catalyst for Electrocatalytic Oxygen Evolution Reaction

采用高温固相法结合离子交换法制备了一种HRu_(4)O_(8)微米棒;利用X射线衍射仪、透射电子显微镜、扫描电子显微镜、X射线光电子能谱等对材料进行形貌和物相表征;采用线性扫描伏安、循环伏安、塔菲尔、计时电位等电化学方法研究了HRu_(4)O_(8)微米棒电解水氧析出反应的催化活性。结果表明:以RuO_(2)纳米颗粒为前驱体制备HRu_(4)O_(8),其电化学活性比表面积显著增大,展现出优异的氧析出催化反应活性,在10 mA/cm^(2)电流密度下的过电位(仅为208 mV)低于RuO2纳米颗粒(276 mV)。另外,HRu_(4)O_(8)微米棒具有出色的稳定性,该研究为设计高活性的电解水催化剂提供了新思路。

One kind of HRu_(4)O_(8) microrods were fabricated with solid-state calcination and the proton exchange method.The morphology and crystal structure of HRu_(4)O_(8) microrods were characterized with X-ray diffraction,transmission electron microscopy,scanning electron microscopy,X-ray photoelectron spectroscopy and so on.The catalytic activity of HRu_(4)O_(8) was evaluated with the linear scanning voltammetry,cyclic voltammetry,Tafel plot,chronopotentiometry and other electrochemical methods.The results showed that the preparation of HRu_(4)O_(8) with the RuO2 nanoparticle precursor resulted in a significant increase of the electrochemical active surface area.HRu_(4)O_(8) exhibited excellent electrocatalytic activity towards OER with an overpotential of only 208 mV at 10 mA/cm^(2),lower than that of RuO_(2) nanoparticles(276 mV).Moreover,HRu_(4)O_(8) also presented outstanding stability for 10 h without apparent degradation.Such work sheds light on new perspectives for designing highly active electrocatalyst of water splitting.