期刊
ACS APPLIED ENERGY MATERIALS
卷 5, 期 11, 页码 14290-14300出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c02846
关键词
ion exchange; defect equilibria; photocatalysis; thermocatalysis; two dimension
资金
- Air Force Office of Scientific Research [AFOSR FA 9550-18-1-0030]
This study presents a simplified and high-yield strategy for using LiCoO2 in multifunctional 2D catalysts. By etching and exfoliation treatments, the catalytic performance of LiCoO2 can be significantly enhanced for photocatalytic and CO oxidation reactions.
The stratified nature of LiCoO2 (LCO) makes such materials suitable for rechargeable Li-ion batteries. The existing synthesis technology for LCO, however, results in a low surface area, low activity, and a limited density of active sites, which limit its applications in catalysis, in which the material's functionality is determined by the reactions that occur on its surface. The present work reports a simplified and high-yield strategy for using bulk LCO in multifunctional two-dimensional (2D) catalysts. The recovery involves ordered and/or disordered leaching of Li+ as a result of H+ intercalation and formation of catalytically active oxygen vacancies at high concentrations (similar to 32 atom %). This is followed by exfoliation of the LCO into porous nanosheets through intercalation of tetramethylammonium hydroxide. The catalytic performance of the etched and exfoliated LCOs was investigated; the 1 M HCl-etched LCO exhibited the highest photocatalytic dye degradation (99.9%) under simulated solar light, while the etched and fully exfoliated LCO showed outstanding CO oxidation, with a T90% = 140 degrees C, which is significantly lower than that of the bulk LCO catalyst (T90% = 360 degrees C).
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