Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 13, Issue 5, Pages 1234-1240Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.1c04153
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Funding
- Department of Science and Technology, SERB Project [DST/TMD/HFC/2k18/138, ECR/2018/0014]
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Among 2D materials, asymmetric Janus structures (MoSSe, WSSe) have exciting properties, and using a magnetic field to control spin manipulation can enhance the efficiency of photo-electrochemical water splitting, while delaminated 2D-MXene (Ti3C2Tx/MoSSe/GaN) can further enhance photocurrent and product formation.
Among two-dimensional (2D) materials, asymmetric Janus structures (MoSSe, WSSe) have many exciting properties, such as out-of-plane piezoelectricity, spatial isolation of charge carriers, and strong spin-orbit coupling (SOC), resulting in a significant Rashba effect. However, the experimental validation to utilize SOC along with advanced optical properties for catalytic applications remains unexplored. Herein, for the first time, we demonstrate a proof-of-concept for spin-manipulated photo-electrochemical water splitting using Janus MoSSe/GaN heterostructures under an external low magnetic field. Further, the activation with delaminated 2D-MXene (Ti3C2Tx/MoSSe/GaN) for efficient electron channeling manifests similar to 1.37 times photocurrent enhancement and similar to 1.50-fold enhancement in product (H-2/O-2) formation under a low applied magnetic field (0.4 T). The external magnetic field supports spin manipulation even under unpolarized light by a spin-to-charge conversion in Janus MoSSe/GaN heterostructures. Density functional theory simulations were performed to understand the role of the Rashba-Dresselhaus effect for efficient charge transport.
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