不同半导体体系中磷化镍光催化甲酸分解的助催化作用  

Co-catalytic Effect of Ni_(2)P on Photocatalytic Formic Acid Dehydrogenation over Different Semiconductors

作　　者：肖兆忠 马智[1] 朴玲钰[2] XIAO Zhaozhong;MA Zhi;PIAO Lingyu(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300072,China;CAS Key Laboratory of Standardization and Measurement for Nanotechnology,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China)

机构地区：[1]天津大学化工学院,天津300072 [2]中国科学院纳米技术标准化与测量重点实验室,中国科学院纳米科学卓越中心,国家纳米科学技术中心,北京100190

出　　处：《高等学校化学学报》2021年第12期3692-3700,共9页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21703046)资助.

摘　　要：研究了在不同的半导体体系(TiO_(2),CdS和C_(3)N_(4))中,Ni_(2)P光催化甲酸(HCOOH)分解制氢的助催化效应.作为助催化剂,Ni_(2)P与3种半导体形成的复合光催化剂均表现出良好的HCOOH分解制氢活性.Ni_(2)P/TiO_(2),Ni_(2)P/CdS,Ni_(2)P/C_(3)N_(4)3种光催化剂最优的产氢活性分别为41.69,22.45和47.67μmol·mg^(−1)·h^(−1),分别为纯TiO_(2),CdS和C_(3)N_(4)的3.8倍、10倍和210倍,表明Ni_(2)P在光催化HCOOH分解制氢体系中具有普适性.研究了光催化HCOOH分解制氢的机理,Ni_(2)P的加入使光生电子从半导体转移至Ni_(2)P,提高了光生电子-空穴对的分离效率;Ni_(2)P还促进了活性物种·OH的生成,提高了光催化HCOOH分解的产氢速率.The co-catalytic effect of Ni_(2)P in the field of photocatalytic formic acid dehydrogenation on different photocatalysts(TiO_(2),CdS and C_(3)N_(4))was studied.Ni_(2)P as a cocatalyst combined with the three semi⁃conductors showed good activity for hydrogen production from formic acid decomposition.The optimal H2 evolution rate reaches 41.69,22.45 and 47.67μmol·mg^(−1)·h^(−1) under the optimal HCOOH concentration over Ni_(2)P/TiO_(2),Ni_(2)P/CdS and Ni_(2)P/C_(3)N_(4) photocatalyst,respectively,which are 3.8,10 and 210 times greater than those of pure TiO_(2),CdS and C_(3)N_(4).The result indicates that Ni_(2)P has universality in photocatalytic decomposi⁃tion of formic acid for hydrogen production.Finally,the mechanism of photocatalytic hydrogen production was proposed.The introduction of Ni_(2)P significantly accelerates photogenerated electrons transfer from semiconduc⁃tor to Ni_(2)P and the separation of photogenerated electrons.At the same time,Ni_(2)P promotes the formation of active species·OH and enhances H2 evolution efficiency.These research results show that nickel phosphide has high hydrogen production activity.It has a good application prospects for constructing an efficient photoca⁃talytic formic acid dehydrogenation system.

关 键 词：光催化 甲酸分解 制氢 机理 磷化镍 

分 类 号：O643[理学—物理化学] TQ426.98[理学—化学]