Enhancing multifunctional photocatalysis with acetate-assisted cesium doping and unlocking the potential of Z-scheme solar water splitting  

作　　者：Mengmeng Ma Jingzhen Li Xiaogang Zhu Kong Liu Kaige Huang Guodong Yuan Shizhong Yue Zhijie Wang Shengchun Qu 

机构地区：[1]Key Laboratory of Semiconductor Materials Science,Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices,Institute of Semiconductors,Chinese Academy of Sciences,Beijing,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing,China [3]Department of Physics,College of Physical Science and Technology,Xiamen University,Xiamen,China [4]State Key Laboratory for Superlattices and Microstructures,Institute of Semiconductors,Chinese Academy of Sciences,Beijing,China

出　　处：《Carbon Energy》2024年第3期178-195,共18页碳能源（英文）

基　　金：supported primarily by the National Natural Science Foundation of China(Contract No.21975245,51972300,62274155,and U20A20206);the National Key Research and Development Program of China(Grant No.2018YFE0204000);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB43000000);the National Natural Science Foundation of China under Grant No.62175231.Prof.Kong Liu appreciates the support from the Youth Innovation Promotion Association,the Chinese Academy of Sciences(No.2020114);the Beijing Nova Program(No.2020117).

摘　　要：Graphitic carbon nitride(g-C_(3)N_(4))has been extensively doped with alkali metals to enlarge photocatalytic output,in which cesium(Cs)doping is predicted to be the most efficient.Nevertheless,the sluggish diffusion and doping kinetics of precursors with high melting points,along with imprecise regulation,have raised the debate on whether Cs doping could make sense.For this matter,we attempt to confirm the positive effects of Cs doping on multifunctional photocatalysis by first using cesium acetate with the character of easy manipulation.The optimized Csdoped g-C_(3)N_(4)(CCN)shows a 41.6-fold increase in visible-light-driven hydrogen evolution reaction(HER)compared to pure g-C_(3)N_(4) and impressive degradation capability,especially with 77%refractory tetracycline and almost 100%rhodamine B degradedwithin an hour.The penetration ofCs+is demonstrated to be a mode of interlayer doping,and Cs–N bonds(especially with sp^(2) pyridine N in C═N–C),along with robust chemical interaction and electron exchange,are fabricated.This atomic configuration triggers the broadened spectral response,the improved charge migration,and the activated photocatalytic capacity.Furthermore,we evaluate the CCN/cadmium sulfide hybrid as a Z-scheme configuration,promoting the visible HER yield to 9.02 mmol g^(−1) h^(−1),which is the highest ever reported among all CCN systems.This work adds to the rapidly expanding field of manipulation strategies and supports further development of mediating served for photocatalysis.

关 键 词：acetate-assisted cesium doping MULTIFUNCTIONAL PHOTOCATALYSIS Z-scheme 

分 类 号：O64[理学—物理化学]