CNR-ICMATE and INSTM, Department of Chemical Sciences , Padova University , Via F. Marzolo, 1 , 35131 Padova , Italy.
Department of Chemical Sciences , Padova University and INSTM , Via F. Marzolo, 1 , 35131 Padova , Italy.
Langmuir. 2018 Apr 17;34(15):4568-4574. doi: 10.1021/acs.langmuir.8b00642. Epub 2018 Apr 6.
Photoreforming promoted by metal oxide nanophotocatalysts is an attractive route for clean and sustainable hydrogen generation. In the present work, we propose for the first time the use of supported MnO nanosystems, both pure and functionalized with Au nanoparticles (NPs), for hydrogen generation by photoreforming. The target oxide systems, prepared by chemical vapor deposition (CVD) and decorated with gold NPs by radio frequency (RF) sputtering, were subjected to a thorough chemico-physical characterization and utilized for a proof-of-concept H generation in aqueous ethanolic solutions under simulated solar illumination. Pure MnO nanosystems yielded a constant hydrogen production rate of 10 mmol h m even for irradiation times up to 20 h. The introduction of Au NPs yielded a significant enhancement in photocatalytic activity, which decreased as a function of irradiation time. The main phenomena causing the Au-containing photocatalyst deactivation have been investigated by morphological and compositional analysis, providing important insights for the design of MnO-based photocatalysts with improved performances.
金属氧化物纳米光催化剂促进的光重整是一种清洁可持续的制氢途径。在本工作中，我们首次提出了使用负载的 MnO 纳米系统，包括纯 MnO 和功能化的 Au 纳米粒子（NPs），用于光重整制氢。通过化学气相沉积（CVD）制备的目标氧化物系统，并通过射频（RF）溅射镀 Au NPs，对其进行了全面的化学物理特性表征，并在模拟太阳光照射下用于在含水乙醇溶液中生成 H 的概念验证。纯 MnO 纳米系统在长达 20 小时的辐照时间内，氢气的生成速率保持在 10 mmol h m。引入 Au NPs 显著提高了光催化活性，但随着辐照时间的延长，活性逐渐降低。通过形态和组成分析研究了导致含 Au 光催化剂失活的主要现象，为设计具有改进性能的基于 MnO 的光催化剂提供了重要的见解。
