Facile tailoring of Co-based spinel hierarchical hollow microspheres for highly efficient catalytic conversion of CO2.
Facile tailoring of Co-based spinel hierarchical hollow microspheres for highly efficient catalytic conversion of CO2.
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DOI：
10.1016/j.jcis.2019.05.054
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发表时间：
2019-09
影响因子：
9.9
通讯作者：
Yaxuan Li;Xinyong Li;Shiying Fan;Jincheng Mu;Zhifan Yin;Hangfan Ma;Shaobin Wang
中科院分区：
文献类型：
--
作者：
Yaxuan Li;Xinyong Li;Shiying Fan;Jincheng Mu;Zhifan Yin;Hangfan Ma;Shaobin Wang
高性能、低成本的光催化剂对于人工光合作用系统将CO2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来制造分层钴基尖晶石空心微球，用于使用钌基敏化剂进行可见光驱动的二氧化碳还原。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守的前体。采用一系列表征技术来研究所制备的钴基尖晶石空心球的结构特征。由于特定的微观结构、功能性Ni/Co物种和氧空位的整合，钴基尖晶石空心球具有增强的CO2吸附能力、更多的活性位点以及光生电子的高效转移和分离。高CO释放速率（27.7μmolh−1）和选择性（84.4%）表明钴基尖晶石空心球在CO2光催化还原方面具有良好的性能。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双金属氧化物分级空心球对于光催化二氧化碳还原是有效的。
High-performance and low-cost photocatalysts are of significance to artificial photosynthetic systems for converting of CO2into 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 CO2reduction 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 CO2adsorption ability, more active sites, and efficient transfer and separation of photoexcited electrons. The high CO-evolving rate (27.7 μmol h−1) and selectivity (84.4%) manifest desirable performance of Co-base spinel hollow spheres for CO2photocatalytic 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 CO2reduction.