利用强度调制光电流/光电压谱研究碳点/KOH电解液界面的动力学行为

doi:10.3866/PKU.WHXB201706092

Abstract

Abstract:

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.

Key words: Carbon dots, Photoelectrochemical hydrogen production, Interface dynamic, IMPS, IMVS

MSC2000:

O649

Li-Xia SANG,Jia LIN,Hao GE,Lei LEI. Dynamic Analysis of Carbon Dots/KOH Electrolyte Interface by IMPS/IMVS[J].Acta Phys. -Chim. Sin., 2017, 33(12): 2454-2462.

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

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