Decoupling the Effects of High Crystallinity and Surface Area on the Photocatalytic Overall Water Splitting over β‐Ga2O3 Nanoparticles by Chemical Vapor Synthesis

结晶度 光催化 材料科学 水溶液 比表面积 化学工程 微晶 纳米颗粒 甲醇 纳米技术 催化作用 化学 复合材料 有机化学 冶金 工程类
作者
Saša Lukić,Jasper Menze,Philipp Weide,G. Wilma Busser,Markus Winterer,Martin Mühler
出处
期刊:Chemsuschem [Wiley]
卷期号:10 (21): 4190-4197 被引量:15
标识
DOI:10.1002/cssc.201701309
摘要

Abstract Chemical vapor synthesis (CVS) is a unique method to prepare well‐defined photocatalyst materials with both large specific surface area and a high degree of crystallinity. The obtained β‐Ga 2 O 3 nanoparticles were optimized for photocatalysis by reductive photodeposition of the Rh/CrO x co‐catalyst system. The influence of the degree of crystallinity and the specific surface area on photocatalytic aqueous methanol reforming and overall water splitting (OWS) was investigated by synthesizing β‐Ga 2 O 3 samples in the temperature range from 1000 °C to 1500 °C. With increasing temperature, the specific surface area and the microstrain were found to decrease, whereas the degree of crystallinity and the crystallite size increased. Whereas the photocatalyst with the highest specific surface area showed the highest aqueous methanol reforming activity, the highest OWS activity was that for the sample with an optimum ratio between high degree of crystallinity and specific surface area. Thus, it was possible to show that the facile aqueous methanol reforming and the demanding OWS have different requirements for high photocatalytic activity.
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