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Interfacial Electric Fields Drive Fast Hydroxyl Radical Production in Black-Carbon-Bearing Microdroplets
Yangyang Liu1, Le Yang1, Qiuyue Ge1
1Shanghai Key Laboratory of Air Quality and Environmental Health, National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, IRDR International Center of Excellence on Risk Interconnectivity and Governance on Weather, Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, Peoples' Republic of China.
Black carbon (BC) aerosols act as potent atmospheric photocatalysts, generating hydroxyl radicals (•OH) via a novel electric field mechanism. This significantly boosts atmospheric oxidative capacity and secondary aerosol formation.
Area of Science:
- Atmospheric chemistry
- Environmental science
- Physical chemistry
Background:
- Black carbon (BC) is known as a reaction substrate in the atmosphere.
- Its intrinsic oxidative potential, particularly hydroxyl radical (•OH) production, is understudied.
Purpose of the Study:
- To investigate the hydroxyl radical (•OH) production potential of BC aerosols.
- To elucidate the underlying mechanism of •OH generation at the BC aerosol interface.
Main Methods:
- Investigated BC-bearing microdroplet aerosols as microreactors.
- Analyzed the role of electric fields and photoaging in •OH production.
- Examined the Field-Induced Carrier Separation (FICS) mechanism.
Main Results:
- BC aerosols exhibit ultrafast •OH production (up to ~12 μmol s⁻¹).
- A strong electric field at the aerosol interface drives •OH production via FICS.
- Synergy between electric fields and photoaging enhances surface defects and redox cycling.
Conclusions:
- BC aerosols function as potent atmospheric photocatalysts, not just radiative agents.
- They significantly amplify atmospheric oxidative capacity.
- Accelerated secondary aerosol formation is a key consequence.
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