| Title: | Photoinduced Simultaneous Thermal and Photocatalytic Activities of MnO(2) Revealed by Femtosecond Transient Absorption Spectroscopy |
| Author(s): | Zhang H; Rong S; Zhang P; |
| Address: | "State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China. Beijing Key Laboratory for Indoor Air Quality Evaluation and Control, Beijing 100084, China" |
| Journal Title: | ACS Appl Mater Interfaces |
| ISSN/ISBN: | 1944-8252 (Electronic) 1944-8244 (Linking) |
| Abstract: | "Solar light-induced catalysis has recently received great interest in efficiently and economically degrading volatile organic compounds, which deteriorate indoor and outdoor air quality. However, a few studies explored its essential photophysical and photochemical processes. Herein, the femtosecond transient absorption spectroscopy was used to investigate the decay of photogenerated holes in MnO(2) with different Mn vacancies. About 67-93% of photogenerated holes recombined within a very short time (<130 ps), resulting in enhanced thermal catalytic activity of MnO(2). Besides, really a small portion of photogenerated holes remained unchanged in the detection time period (1400 ps). ESR tests further confirm that photocatalytic pathway plays a significant role in degrading VOCs besides the thermal catalytic pathway when MnO(2) is under illumination of UV-visible light. The introduction of an appropriate content of Mn vacancy did prolong the lifetime of photogenerated carriers. This work clarifies the mechanism of photoirradiation in improving the catalytic activity of MnO(2) and the effect of manganese defects on the catalytic reaction" |
| Keywords: | MnO2 lifetime manganese vacancy photocatalysis thermal catalysis; |
| Notes: | "PubMed-not-MEDLINEZhang, Huiyu Rong, Shaopeng Zhang, Pengyi eng 2021/04/17 ACS Appl Mater Interfaces. 2021 Apr 28; 13(16):18944-18953. doi: 10.1021/acsami.1c05009. Epub 2021 Apr 16" |
