Article An efficient cathode electrocatalyst for anion exchange membrane water electrolyzer

Shanmugam Ramakrishnan ; Subramanian Vijayapradeep ; Selva Chandrasekaran Selvaraj ORCID (National Institute for Materials Science) ; Jian Huang ; S.C. Karthikeyan ; Rambabu Gutru ; Natarajan Logeshwaran ; Tsuyoshi Miyazaki SAMURAI ORCID (National Institute for Materials Science) ; Mohamed Mamlouk ; Dong Jin Yoo

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Shanmugam Ramakrishnan, Subramanian Vijayapradeep, Selva Chandrasekaran Selvaraj, Jian Huang, S.C. Karthikeyan, Rambabu Gutru, Natarajan Logeshwaran, Tsuyoshi Miyazaki, Mohamed Mamlouk, Dong Jin Yoo. An efficient cathode electrocatalyst for anion exchange membrane water electrolyzer. Carbon. 2024, 220 (), 118816.
SAMURAI

Description:

(abstract)

A 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 anion exchange membrane (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 green hydrogen.

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Keyword: Hierarchical MoS2, Pt–C core-shell, Density functional theory, In-situ Raman analysis, Anion exchange membrane water electrolyzer

Date published: 2024-01-15

Publisher: Elsevier BV

Journal:

  • Carbon (ISSN: 00086223) vol. 220 p. 118816- 118816

Funding:

  • Ministry of Education 2023RIS-008
  • Ministry of Education NRF-2022R1A2C1012300
  • National Research Foundation of Korea
  • UK Research and Innovation
  • Jeonbuk National University
  • Newcastle University EP/W005204/1

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1016/j.carbon.2024.118816

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Updated at: 2024-03-04 16:30:11 +0900

Published on MDR: 2024-03-04 16:30:11 +0900

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