Li Yaxuan, Li Xinyong, Fan Shiying, Mu Jincheng, Yin Zhifan, Ma Hangfan, Wang Shaobin
State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
State Key Laboratory of Fine Chemicals, Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
J Colloid Interface Sci. 2019 Sep 15;552:476-484. doi: 10.1016/j.jcis.2019.05.054. Epub 2019 May 18.
High-performance and low-cost photocatalysts are of significance to artificial photosynthetic systems for converting of CO into CO and other value-added products. In this work, we developed a controllable and scalable self-templated approach to fabricate hierarchical Co-base spinel hollow microspheres for visible light-driven CO reduction with a Ru-based sensitizer. The hollow microspheres are assembled by ultrathin nanosheets using Ni-Co-hydroxides as the morphology-conserved precursor. A series of characterization techniques were conducted to investigate structural features of the prepared Co-base spinel hollow spheres. Owing to the integration of the specific microstructure, functional Ni/Co species and oxygen vacancies, Co-base spinel hollow spheres possess enhanced CO adsorption ability, more active sites, and efficient transfer and separation of photoexcited electrons. The high CO-evolving rate (27.7 μmol h) and selectivity (84.4%) manifest desirable performance of Co-base spinel hollow spheres for CO photocatalytic reduction. The findings suggest that such spinel-structured bimetallic oxides hierarchical hollow spheres, facilely synthesized via the proposed self-templated method, are efficient for photocatalytic CO reduction.
高性能且低成本的光催化剂对于人工光合系统将CO转化为CO和其他增值产品具有重要意义。在这项工作中，我们开发了一种可控且可扩展的自模板方法，以制备具有分级结构的钴基尖晶石空心微球，用于在基于钌的敏化剂作用下实现可见光驱动的CO还原。这些空心微球由超薄纳米片组装而成，使用镍钴氢氧化物作为形态保留前驱体。我们进行了一系列表征技术来研究制备的钴基尖晶石空心球的结构特征。由于特定微观结构、功能性镍/钴物种和氧空位的整合，钴基尖晶石空心球具有增强的CO吸附能力、更多的活性位点以及光激发电子的高效转移和分离。高的CO析出速率（27.7 μmol h）和选择性（84.4%）表明钴基尖晶石空心球在CO光催化还原方面具有理想的性能。研究结果表明，通过所提出的自模板方法轻松合成的这种尖晶石结构的双金属氧化物分级空心球对于光催化CO还原是高效的。
