Polypyrrole reinforced ZIF-67 with modulated facet exposure and billion-fold electrical conductivity enhancement towards robust photocatalytic CO2 reduction

• 作者: Xuzhou Yuan Qiaoqiao Mu Songlin Xue Yanhui Su Yanlei Zhu Hao Sun Zhao Deng Yang Peng
• 来源期刊: 能源化学
• 年，卷（期）: 2021,（9）
• 页码范围: 202-208
• 页数: 7页
• 语种: 英文

摘要

The implementation of metal organic frameworks(MOFs)as the co-catalysts in hybrid photocatalytic systems puts requirements on both their charge-carrying capability and solvent stability.In the current study,in order to simultaneously promote the electrical conductivity and water stability of ZIF-67,an in-situ monomer trapping strategy is deployed to synthesize polypyrrole(PPy)-reinforced ZIF-67 ensembles.Through coordination modulation,the incremental addition of pyrrole monomers enables to alter the crystal morphology of ZIF-67 from rhombic dodecahedra to truncated rhombic dodecahedra,and further to cubes.Upon polymerization,the resulted composite,in comparison to ZIF-67,demonstrates a billion-fold conductivity enhancement,much improved chemical stability in pronated solvents,as well as largely retained specific surface area and porosity,enabling it functioning as an outstanding co-catalyst for cat-alyzing robust photocatalytic CO2 reduction.Furthermore,a PPy-mediated electron harvest and relay mechanism is proposed for rationalizing the enhanced photocatalytic performance.