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Lookup NU author(s): Dr Ramakrishnan ShanmugamORCiD, Jian Huang, Dr Rambabu Gutru, Professor Mohamed MamloukORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024 The AuthorsA high performance and durable electrocatalyst for the cathodic hydrogen evolution reaction (HER) in anion exchange membrane (AEM) water electrolyzers is crucial for the emerging hydrogen economy. Herein, we synthesized Pt–C core-shell nanoparticles (core: Pt nanoparticles, shell: N-containing carbon) were uniformly coated on hierarchical MoS2/GNF using pyrolysis of h-MoS2/GNF with a Pt-aniline complex. The synthesized Pt–C core-shell@h-MoS2/GNF (with 11.3 % Pt loading) showed HER activity with a lower overpotential of 30 mV at 10 mA cm−2 as compared to the benchmark catalyst 20 % Pt–C (41 mV at 10 mA cm−2) with improved durability over 94 h at 10 mA cm−2. Furthermore, we investigated the structural stability and hydrogen adsorption energy for Pt13 cluster, C90 molecule, h-MoS2 sheet, Pt13–C90 core-shell, and Pt13–C90 core-shell deposited h-MoS2 sheets using density functional theory (DFT) simulations. We investigated the Pt–C core-shell@h-MoS2/GNF catalyst active sites during HER performance using in-situ Raman analysis as well as DFT. We fabricated AEM water electrolyzers with cathode catalysts of Pt–C core-shell@h-MoS2/GNF and evaluated device performance with 0.1 and 1.0 M KOH at 20 and 60 °C. Our work provides a new pathway to design core-shell electrocatalysts for use in AEM water electrolyzers to generate hydrogen.
Author(s): Ramakrishnan S, Vijayapradeep S, Selvaraj SC, Huang J, Karthikeyan SC, Gutru R, Logeshwaran N, Miyazaki T, Mamlouk M, Yoo DJ
Publication type: Article
Publication status: Published
Journal: Carbon
Year: 2024
Volume: 220
Print publication date: 20/02/2024
Online publication date: 14/01/2024
Acceptance date: 12/01/2024
Date deposited: 14/02/2024
ISSN (print): 0008-6223
ISSN (electronic): 1873-3891
Publisher: Elsevier Ltd
URL: https://doi.org/10.1016/j.carbon.2024.118816
DOI: 10.1016/j.carbon.2024.118816
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