物理化学学报

所属专题: CO2还原

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光催化CO2还原的超薄层状催化剂

秦祖赠1, 吴靖1, 李斌1, 苏通明1, 纪红兵1,2   

  1. 1 广西大学化学化工学院,南宁 530004;
    2 中山大学化学学院,广州 510275
  • 收稿日期:2020-05-11 修回日期:2020-06-10 录用日期:2020-06-18 发布日期:2020-06-24
  • 通讯作者: 秦祖赠, 纪红兵 E-mail:qinzuzeng@gxu.edu.cn;jihb@mail.sysu.edu.cn
  • 基金资助:
    国家自然科学基金(21968007, 21938001), 广西自然科学基金(2016GXNSFFA380015, 2019GXNSFAA245006)和广西八桂学者专项基金资助

Ultrathin Layered Catalyst for Photocatalytic Reduction of CO2

Zuzeng Qin1, Jing Wu1, Bin Li1, Tongming Su1, Hongbing Ji1,2   

  1. 1 School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China;
    2 School of Chemistry, Sun Yat-Sen University, Guangzhou 510275, P. R. China
  • Received:2020-05-11 Revised:2020-06-10 Accepted:2020-06-18 Published:2020-06-24
  • Supported by:
    The project was supported by the National Natural Science Foundation of China (21968007, 21938001), Guangxi Natural Science Foundation, China (2016GXNSFFA380015, 2019GXNSFAA245006), Special funding for ‘Guangxi Bagui Scholars’, China.

摘要: 随着工业化进程加快和消费结构的持续升级,大气中CO2的含量远超过去水平,成为了一个严重的全球性环境问题。光催化CO2还原是解决大气中二氧化碳含量上升的最有前景的手段之一,该技术的核心是开发高效、环保、廉价的光催化剂。凭借大比表面积、大量低配位表面原子,从催化剂内部到表面转移距离更短等性能优势,超薄层状材料显示出实现光催化二氧化碳还原的巨大潜力。本文总结了用于光催化CO2还原的超薄层状光催化剂的最新进展,对现有催化剂进行了分类,对其制备方法和光催化CO2还原机理进行了介绍。另外,重点对保持超薄催化剂层状结构的前提下,采用厚度调整、掺杂、构造缺陷和复合等改进催化剂光催化性能的策略进行了讨论。最后,对用于光催化二氧化碳还原的超薄层状光催化剂的未来机遇和挑战进行了展望。

关键词: 光催化, 二氧化碳, 超薄, 层状, 纳米片

Abstract: The acceleration of industrialization and the continuous upgradation of consumption structure has increased the atmospheric content of CO2 far beyond the past levels, leading to a serious global environmental problem. Photocatalytic reduction of CO2 is one of the most promising methods to solve the problem of rising atmospheric CO2 content. The core of this technology is to develop efficient, environment-friendly, and affordable photocatalysts. A photocatalyst is a semiconductor that can absorb photons from sunlight and produce electron-hole pairs to initiate a redox reaction. Owing to their low specific surface areas, significant electron-hole recombination, and less surface-active sites, bulk photocatalysts are not satisfactory. Ultrathin layered materials have shown great potential for photocatalytic CO2 reduction owing to their characteristics of large specific surface area, a large number of low-coordination surface atoms, short transfer distance from the inside to the catalyst surface, along with other advantages. Photoexcited electrons only need to cover a short distance to transfer to the nanowafer surface, and the speed of migrating electrons on the nanowafer surface is much higher than that in the layers or in the bulk catalyst. The ultrathin structure leads to significant coordinative unsaturation and even vacancy defects in the lattice structure of the atoms; while the former can be used as active sites for CO2 adsorption and reaction, the latter can improve the separation of the electron-hole pair. This review summarizes the latest developments in ultrathin layered photocatalysts for CO2 reduction. First, the photocatalytic reduction mechanism of CO2 is introduced briefly, and the factors governing product selectivity are explained. Second, the existing catalysts, such as g-C3N4, black phosphorus (BP), graphene oxide (GO), metal oxide, transition metal dichalcogenides (TMDCs), perovskite, BiOX (X = Cl, Br, I), layered double hydroxide (LDH), 2D-MOF, MXene, and two-dimensional honeycomb-like Ge―Si alloy compounds (gersiloxenes), are classified. In addition, the prevalent preparation methods are summarized, including mechanical stripping, gas stripping, liquid stripping, chemical etching, chemical vapor deposition (CVD), template method, self-assembly of surfactant, and the intermediate precursor method of lamellar Bi-oleate complex. Finally, we introduced the strategy of improving photocatalyst performance on the premise of maintaining its layered structure, including the factors of thickness adjustment, doping, structural defects, composite, etc. The future opportunities and challenges of ultrathin layered photocatalysts for the reduction of carbon dioxide have also been proposed.

Key words: Photocatalysis, Carbon dioxide, Ultra-thin, Layered, Nanosheets

MSC2000: 

  • O643