He Bing, Zhao Feifan, Yi Ping, Huang Jing, Wang Yang, Zhao Shiqiang, Li Zhen, Zhao Yanli, Liu Xueqin
Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan 430074, P. R. China.
Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore.
ACS Appl Mater Interfaces. 2021 Oct 20;13(41):48901-48912. doi: 10.1021/acsami.1c15225. Epub 2021 Oct 12.
Spinel oxide materials have been widely used as oxygen evolution catalysts to enhance the photoelectrochemical (PEC) performance of photoelectrodes. Herein, we demonstrate that the water splitting efficiency of a photoanode can be further enhanced by introducing its photothermal effect. Under near-infrared radiation, the temperature of the NiCoO/BiVO photoanode increases moderately, leading to improved water oxidation kinetics and charge transport simultaneously. With the assistance of the photothermal effect, the obtained photoanode reaches a photocurrent density of 6.20 mA cm at 1.23 V vs reversible hydrogen electrode. A series of spinel-type MCoO oxides (M = Mn, Zn, Cu, and Fe) are deposited on the surface of the BiVO photoanode to show similar photothermally enhanced PEC performance. The research discovery provides a way for improving the catalytic activity of photoanode materials with a photothermal effect, which may be applied to various fields of energy conversion, including CO reduction, N fixation, and pollutant degradation.
尖晶石氧化物材料已被广泛用作析氧催化剂，以提高光电极的光电化学（PEC）性能。在此，我们证明通过引入光热效应可以进一步提高光阳极的水分解效率。在近红外辐射下，NiCoO/BiVO光阳极的温度适度升高，从而同时改善了水氧化动力学和电荷传输。在光热效应的辅助下，所制备的光阳极在相对于可逆氢电极1.23 V时达到6.20 mA cm的光电流密度。一系列尖晶石型MCoO氧化物（M = Mn、Zn、Cu和Fe）沉积在BiVO光阳极表面，表现出类似的光热增强PEC性能。该研究发现为利用光热效应提高光阳极材料的催化活性提供了一种途径，这可能应用于包括CO还原、N固定和污染物降解在内的各种能量转换领域。
