Abstract
Search for a Platinum metal-free catalyst for Proton Exchange Membrane Fuel Cells (PEMFCs) is a concern to scientists as the Pt-catalyzed electrode comprises about 45% of the entire fuel cell stack cost. Due to layered structure, Two-dimensional (2D) MoS2 nanostructured materials have recently drawn attention as effective catalysts for oxygen reduction reaction (ORR). The 1T-phase of MoS2 (1T-MoS2) has higher electronic conductivity than the 2H-phase (2H-MoS2); high surface area 1T-MoS2 can have high electrocatalytic activity towards PEFFCs. Here, we report hydrothermally synthesized 2H-MoS2 and solvothermally synthesized mixed 1T/2H-MoS2 phases as a catalyst for ORR in PEM Fuel Cells. Owing to the high BET-specific surface area, hybrid 1T/2H-MoS2 showed better ORR activity than 2H-MoS2. The limiting current density of the 1T/2H-MoS2 hybrid structure is ‒7.1 mA cm−2 compared to Pt/C (‒8.2 mA cm−2) at 1600 rpm. The Tafel slope values of 2H-MoS2, 1T/2H-MoS2, and Pt/C are 92.7 mV dec−1, 57.5 mV dec−1, and 39.3 mV dec−1, respectively. The electron transferred during ORR are 3.8 and 1.8, respectively, for 1T/2H-MoS2 and 2H-MoS2 (in 0.1 M KOH) ; suggesting less formation of undesirable peroxide formation than 2H-MoS2. The 1T/2H-MoS2 displays better electrochemical durability compared to 2H-MoS2 (after 2000 CV cycles).
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Acknowledgements
The SERB, New Delhi is acknowledged by the authors for funding the lab infrastructure under the SRG project (Ref: SRG/2019/001090).The authors thank Prof. Kanupriya Sachdev, Dr. Debasish Sarkar and Dr. Ritu Bala for their meaningful advice. The characterizations were done by Material Research Centre (MRC), MNIT Jaipur. The authors also acknowledge MRC.
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Conceptualization, Methodology, experimental, and writing the original draft was done by MS. Conceptualization, validation, review, supervision, and editing of the final manuscript were done by RD. VK and KR reviewed and edited the manuscript.
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Shrivastav, M., Kumar, V., Rana, K. et al. Oxygen reduction reaction kinetics of 2H-MoS2 and mixed-phase 1T/2H-MoS2 as a metal-free cathodic catalyst for PEM fuel cells. J Appl Electrochem (2024). https://doi.org/10.1007/s10800-023-02053-0
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DOI: https://doi.org/10.1007/s10800-023-02053-0