Lukic Sasa, Menze Jasper, Weide Philipp, Busser G Wilma, Winterer Markus, Muhler Martin
Nanoparticle Process Technology (NPPT) and CENIDE, University of Duisburg-Essen, 47057, Duisburg, Germany.
Laboratory of Industrial Chemistry, Ruhr-University Bochum, 44780, Bochum, Germany.
ChemSusChem. 2017 Nov 9;10(21):4190-4197. doi: 10.1002/cssc.201701309. Epub 2017 Oct 16.
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 O nanoparticles were optimized for photocatalysis by reductive photodeposition of the Rh/CrO 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 O 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.
化学气相合成（CVS）是一种独特的方法，用于制备具有大比表面积和高结晶度的明确光催化剂材料。通过Rh/CrO助催化剂体系的还原光沉积，对所得的β-GaO纳米颗粒进行了光催化优化。通过在1000°C至1500°C的温度范围内合成β-GaO样品，研究了结晶度和比表面积对光催化水相甲醇重整和全水分解（OWS）的影响。随着温度升高，发现比表面积和微观应变降低，而结晶度和晶粒尺寸增加。具有最高比表面积的光催化剂表现出最高的水相甲醇重整活性，而最高的OWS活性则是具有最佳结晶度与比表面积之比的样品所具有的。因此，有可能表明，简便的水相甲醇重整和苛刻的OWS对高光催化活性有不同的要求。
