摘要
光催化分解水制氢技术作为一种将太阳能转换为清洁、高效氢能的可持续途径,具有无污染、可再生等优点。为了提高三元金属硫化物NiIn_(2)S_(4)的制氢性能,该文将Co_(2)P纳米颗粒负载到表面,得到Co_(2)P/NiIn_(2)S_(4)复合光催化剂。采用XRD、SEM、TEM、XPS、DRS、PL、电化学等多种技术对Co_(2)P/NiIn_(2)S_(4)的结构进行了分析,表征了其在可见光和紫外-可见光下分解水制氢的性能。Co_(2)P的负载可以降低Ni In_2S_4的禁带宽度,增强其在可见光区域的吸收。更重要的是,Co_(2)P与NiIn_(2)S_(4)之间的能带匹配,可以促进光生电荷从NiIn_(2)S_(4)向Co_(2)P的传输,实现光催化还原反应位和氧化反应位在空间上的分离,有效抑制了光生载流子的复合。因此,Co_(2)P的负载显著增强了NiIn_(2)S_(4)光催化制氢的性能。当Co_(2)P的负载量为5%(w)时,得到的5-Co_(2)P/NiIn_(2)S_(4)复合光催化剂表现出最佳的光催化性能,制氢速率达到384.8μmol/h,是单一NIS的29.2倍,365和420 nm处的表观量子效率分别为32.7%和10.1%,且表现出良好的稳定性和耐久性。
Photocatalytic water splitting for hydrogen production is a sustainable approach to convert solar energy into clean and efficient hydrogen energy,with the advantages of being pollution-free and renewable.To enhance the hydrogen produc-tion performance of ternary metal sulfide NiIn_(2)S_(4),Co_(2)P nanoparticles were loaded onto its surface,resulting in the fabrication of Co_(2)P/NiIn_(2)S_(4) composite photocatalysts.The structure of Co_(2)P/NiIn_(2)S_(4) was analyzed using various techniques including XRD,SEM,TEM,XPS,DRS,PL,and electrochemistry,and the photocatalytic performance for hydrogen production under visible and UV-visible light was evaluated.The loading of Co_(2)P can reduce the bandgap of NiIn_(2)S_(4) and enhance the absorp-tion in visible light region.More importantly,the band alignment between Co_(2)P and NiIn_(2)S_(4) can promote the transfer of photo-generated electrons from NiIn_(2)S_(4) to Co_(2)P,achieving spatial separation of photocatalytic reduction and oxidation reaction sites,effectively suppressing the recombination of photogenerated charge carriers.Therefore,the loading of Co_(2)P significantly enhanced the photocatalytic hydrogen production performance of NiIn_(2)S_(4).When the loading amount of Co_(2)P was 5%(w),the obtained 5-Co_(2)P/NiIn_(2)S_(4) composite exhibited the optimum photocatalytic activity and good stability and durability,with a hydrogen production rate of 384.8μmol/h,which is 29.2 times that of the pristine NiIn_(2)S_(4).The apparent quantum efficiency at 365 and 420 nm was 32.7%and 10.1%,respectively.
作者
张劲松
周晓红
汤燕
ZHANG Jinsong;ZHOU Xiaohong;TANG Yan(Anhui Ecological Environmental Monitoring Centre,Hefei 230071,China;Shanghai Keze Intelligence Environment Sci-Tech Co.,Ltd.,Shanghai 200090,China;School of the Environmental and Safety Engineering,Jiangsu University,Zhenjiang 212000,China)
出处
《环境科学与技术》
北大核心
2025年第2期60-67,共8页
Environmental Science & Technology
基金
西藏自治区重点研发计划项目(XZ202301ZY0002N)。
