Photochemical Metal Organic Deposition of FeOx Catalyst on BiVO4 for Improving Solar-Driven Water Oxidation Efficiency

• Main Authors: Bo-En Wu, 吳伯恩
• Other Authors: Chia-Ying Chiang
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/7695m9

碩士 === 國立臺灣科技大學 === 化學工程系 === 105 === Serving as a photoelectrochemical water splitting material, monoclinic BiVO4 satisfies many requirements for a highly active photoanode, such as moderate band gap (2.55eV), favorable chemical and photoelectrochemical stability, low overpotential for oxygen evolution reaction. However, it suffers from a key drawback: the slow kinetics of photon-generated charge carrier reacting with water molecules. Therefore, a layer of metal oxide oxygen evolution reaction catalyst, preparing by photochemical metal-organic deposition (PMOD), was introduced on the BiVO4 photoanode surface to enhance the efficiency of photoelectrochemical water splitting reaction. In this study, amorphous iron oxide catalyst was deposited on the BiVO4 photoanode. It is found that there is an optimal thickness for the metal oxide catalyst due to the competition between the light sheltering effect of this catalyst layer and the amount for catalyst for reaction. With the introduction of this catalyst layer, the photocurrent density increases about two times, i.e. from 0.5 mA/cm2 for BiVO4 alone to 1.2 mA/cm2 for FeOx/BiVO4 at 1.3 V vs. RHE.