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Effective Charge Separation in a Dual-Single-Atom Photocatalyst for Sacrificial Agent-Free H2 Evolution

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Title
Effective Charge Separation in a Dual-Single-Atom Photocatalyst for Sacrificial Agent-Free H<sub>2</sub> Evolution
Author(s)
Mengfang Liang; Xiaodong Shao; Yunhee Cho; Amol R. Jadhav; Yosep Hwang; Jinsun Lee; Kim, Min Gyu; Yeseul Hong; Sara Ajmal; Dong-Yub Yee; Tran, Trang Thu; Kim, Jeongyong; Bui, Viet Q.; Ho, Thi Huynh; Zhao, Shufang; Kim, Young Dok; Ji-Hee Kim; Hyoyoung Lee
Publication Date
2024-04
Journal
ACS SUSTAINABLE CHEMISTRY &amp; ENGINEERING, v.12, no.16, pp.6122 - 6131
Publisher
AMER CHEMICAL SOC
Abstract
The challenge of achieving efficient photocatalytic H-2 production from water splitting without sacrificial agents remains a significant hurdle. Herein, we demonstrate that the dual doping of Cu/Co single atoms on Li-reduced blue TiO2 (Cu-Co SA/BTO) can effectively modulate the charge separation of photogenerated carriers during photocatalytic pure water splitting. Remarkably, the H-2 evolution rate of Cu-Co SA/BTO achieves a remarkable value of 1238.15 mu molg(-1)h(-1), surpassing that of BTO by 11 times. Particularly, femtosecond transient absorption spectroscopy (fs-TA) and differential charge densities reveal that the efficient electron-hole separation originates from the doping of Cu/Co dual-single atoms. The doping of Cu single atoms boosts electron transfer from the TiO2 conduction band to Cu atoms, while the doping of Co single atoms facilitates photogenerated hole migration to Co single atoms from TiO2. This work establishes a promising photocatalyst design strategy for achieving highly efficient H-2 evolution through pure water splitting, marking a significant step toward sustainable and green energy production.
URI
https://pr.ibs.re.kr/handle/8788114/15195
DOI
10.1021/acssuschemeng.3c07119
ISSN
2168-0485
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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