Core-shell particles of C-doped CdS and graphene: A noble metal-free approach for efficient photocatalytic H_(2) generation

• 作者: Muhammad Zubair Estelle Marie M.Vanhaecke Ingeborg-Helene Svenum Magnus RФnning Jia Yang
• 来源期刊: 绿色能源与环境:英文版
• 学科: 工学
• 关键词: C-doped CdS@G Core-shell nanostructure Photocatalytic H2 generation GRAPHENE Carbon doping in CdS Bandgap narrowing
• 年，卷（期）: 2020,（4）
• 页码范围: 461-472
• 页数: 12页
• 分类号: TB3

摘要

To achieve efficient photocatalytic H_(2) generation from water using earth-abundant and cost-effective materials,a simple synthesis method for carbon-doped CdS particles wrapped with graphene(C-doped CdS@G)is reported.The doping effect and the application of graphene as cocatalyst for CdS is studied for photocatalytic H_(2) generation.The most active sample consists of CdS and graphene(CdS-0.15G)exhibits promising photocatalytic activity,producing 3.12 mmol g^-(1) h^-(1) of H_(2) under simulated solar light which is~4.6 times superior than pure CdS nanoparticles giving an apparent quantum efficiency(AQY)of 11.7%.The enhanced photocatalytic activity for H_(2) generation is associated to the narrowing of the bandgap,enhanced light absorption,fast interfacial charge transfer,and higher carrier density(N_(D))in C-doped CdS@G samples.This is achieved by C doping in CdS nanoparticles and the formation of a graphene shell over the C-doped CdS nanoparticles.After stability test,the spent catalysts sample was also characterized to investigate the nanostructure.