4.8 Article

Hot-Electron-Induced Photothermal Catalysis for Energy-Dependent Molecular Oxygen Activation

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 9, Pages 4872-4878

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202012306

Keywords

activation barrier; energy transfer; hot electron; molecular oxygen activation (MOA); photothermal catalysis

Funding

  1. National Natural Science Foundation of China [52022048, 51738013, 51978371]
  2. Chinese Academy of Sciences [QYZDY-SSW-DQC004]
  3. Independent Project Program of State Key Laboratory of Petroleum Pollution Control [PPCIP2017002]
  4. CNPC Research Institute of Safety and Environmental Technology

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The study demonstrates that hot electrons can enhance the electron-donating effect in molecular oxygen activation (MOA) process, thereby reducing the activation energy barrier and increasing the efficiency and light dependence of MOA.
Hot electrons activate reactants and reduce the activation energy barrier (E-a) of a reaction through electron donation. However, a comprehensive understanding of the intrinsic driving force of this electron-donating effect is lacking, let alone the precise manipulation of electron donation processes. Herein, the essential and promotional role of hot electron energy on the electron-donating effect was elucidated using molecular oxygen activation (MOA) as a model reaction. Through providing an available electron source to the conventional photo-thermal conversion system, the high energy carried by hot electrons was liberated and greatly enhanced the electron donation towards the LUMO (pi*) orbit of O-2. The energy was also transferred to O-2 and elevated the potential energy surface (PES) of MOA, which was reflected by the enhanced formation of superoxide oxygen anions. As predicted, the E-a of MOA decreased by 45.1 % and exhibited a substantial light dependence, demonstrating that MOA became energy-efficient due to improved exploitation and conversion of photon energies.

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