Enhanced Photoelectrocatalytic Activity of TiO2 Nanowire Arrays via Copolymerized G-C3N4 Hybridization

Energies

Runhua Li¹  Qiaohuan Wu¹  Yajun Wang¹  Fan Fan¹  Zhuang Yang¹  Yuming Li¹  Guiyuan Jiang¹ 

[1] State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;

关键词: photoelectrocatalysis;    copolymerization;    CN_x;    TiO₂;    nanowire arrays;   

DOI  :  10.3390/en15124180

来源: DOAJ

【 摘 要 】

Photoelectrocatalytic (PEC) oxidation is an advanced technology that combines photocatalytic oxidation (PC) and electrolytic oxidation (EC). PEC activity can be greatly enhanced by the PC and EC synergy effect. In this work, novel copolymerized g-C₃N₄ (denoted as CN_x)/TiO₂ core-shell nanowire arrays were prepared by chemical vapor deposition. CN_x were deposited on the surface of TiO₂ nanowire arrays using organic monomer 4,5-dicyanidazole and dicyandiamide as copolymerization precursor. TiO₂ nanowire arrays provide a direct and fast electron transfer path, while CN_x is a visible light responsive material. After CN_x deposition, the light response range of TiO₂ is broadened to 600 nm. The deposition of CN_x shell effectively improves the PC efficiency and PEC efficiency of TiO₂. Under visible light irradiation and 1 V bias potential, the rate constant k of PEC degradation of CN_x/TiO₂ core-shell nanowire arrays is 0.0069 min⁻¹, which is 72% higher than that of pure TiO₂ nanowires. The built-in electric field formed in the interface between TiO₂ core and CN_x shell would effectively promote photogenerated charge separation and PEC activity.

【 授权许可】

Unknown