| Summary: | 碩士 === 逢甲大學 === 化學工程學系 === 107 === The aim of this study is to discovery the optimum composition of NiO2-based binary and ternary metal oxide catalysts for oxygen evolution reaction (OER) by scanning electrochemical microscopy. A metal oxide mainly composed of nickel and added with other metals such as cobalt, iron, lanthanum, gallium, vanadium, gold, silver, lanthanum, manganese, lanthanum, tin, zinc, copper, tungsten by the combinatorial methods. The ratio of the catalyst with higher activity after screening is prepared into a large electrode. The Tafel slope, electron transfer coefficient, standard rate constant, onset potential and amount of oxygen evolution of the catalysts were determinded by Tafel plots, linear sweep voltammetry and polarization curve . The surface morphology and elemental compositon of catalysts were characterized by sanning electron microscope and energy dispersive spectrometer while the crystalline and chemical state of the catalysts were characterized by high resolution X-ray diffractometer and X-ray photoelectron spectroscope. The results show that the Ni0.4Ir0.2Co0.4Ox catalysts have the best activity for OER. The catalytic current value, overpotential and standard rate constant of the Ni0.4Co0.4Ir2Ox catalysts are 9.44 nA/cm2, 0.492V and 2.4110-12 cm/s at 0.55 V vs. Ag/AgCl.
Key word：metal oxide catalysts, nickel oxide, oxygen evolution reaction (OER), scanning electrochemical microscopy (SECM)
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