Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
Publication date: 16th December 2024
This study investigates the synthesis, microstructural characterization, and photoelectrochemical (PEC) performance of a Ti₃C₂Tₓ MXene-decorated MoS₂/SiNWs photocathode, fabricated through hydrothermal and spray coating techniques. The hypothesis posits that the incorporation of MXenes enhances charge separation and photocathodic activity, leading to efficient PEC wastewater (WW) splitting for hydrogen generation and organic pollutant degradation. Experimental results confirm the successful formation of a type-II heterostructure, with Ti₃C₂Tₓ MXenes boosting charge separation. The Ti₃C₂Tₓ/MoS₂/SiNWs photocathode achieves an incident photon-to-current efficiency (IPCE) of 38.12%, significantly outperforming the MoS₂/SiNWs photocathode (15.26%). Long-term chronoamperometry indicates improved stability, and optimized electrodes demonstrate efficient WW treatment, with 80.80% methylene blue degradation, total organic content reduction to 1.520 mg/ml, and a hydrogen production rate of 9.32 µmol/h at -0.78 V vs RHE. Mechanistic studies via scavenger analysis revealed that hole-mediated pathways drive pollutant degradation, while electron-driven hydrogen generation underpins the enhanced PEC activity. This novel Ti3C2Tx/MoS2/SiNWs photocathode showcases the potential for dual applications, offering an effective approach for both energy generation and environmental remediation.
SS gratefully acknowledges the funding support from the Department of Science and Technology (DST), India, through the INSPIRE program (IF200308) for her doctoral research. PD extends gratitude to SERB for the support under project WEA/2020/000022, as well as to CSIR-H2T Hydrogen Mission (FBR 1.2—Catalyst Development for Electrolyzer) for facilitating this study. The authors also express their appreciation to the Director of CSIO for granting permission and providing the necessary infrastructure to conduct this research.
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