Citation: SANG Li-Xia, LIN Jia, GE Hao, LEI Lei. Dynamic Analysis of Carbon Dots/KOH Electrolyte Interface by IMPS/IMVS[J]. Acta Physico-Chimica Sinica, ;2017, 33(12): 2454-2462. doi: 10.3866/PKU.WHXB201706092 shu

Dynamic Analysis of Carbon Dots/KOH Electrolyte Interface by IMPS/IMVS

Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

Received Date: 8 May 2017
Revised Date: 31 May 2017

Fund Project: The project was supported by the National Natural Science Foundation of China (51376013).

The dynamic behaviors at the interface of carbon dots and KOH electrolyte were studied using intensity-modulated photocurrent spectroscopy (IMPS) and intensity-modulated photovoltage spectroscopy (IMVS) in the photoelectrochemical hydrogen production from water splitting. The results show that the kinetic parameters like electron transport time (τ_d), electron diffusion coefficient (D_n), electron lifetime (τ_n), and electron diffusion length (L_n) remain unchanged in the light intensity range of 30-90 mW·cm^-2. When the light intensity increases to 110 and 130 mW·cm^-2, τ_d and τ_n increase, while D_n decreases. It is indicated that the photogenerated electrons are mainly transported in the trap-free limited diffusion mode at the electrode/electrolyte interface due to the presence of few defects in carbon dots, which is different from the mode of transport at the semiconductor TiO₂/electrolyte interface. Moreover, the photocarrier collection efficiencies (η_cc) associated with the electron transport time and the electron lifetime are similar for light intensity of 30-130 mW·cm^-2.
- Carbon dots,
- Photoelectrochemical hydrogen production,
- Interface dynamic,
- IMPS,
- IMVS
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