Surface-functionalized three-dimensional MXene supports to boost the hydrogen evolution activity of Pt catalysts in alkaline media

Haeji Hong, Ho Young Kim, Won Il Cho, Ho Chang Song, Hyung Chul Ham, Kyunghee Chae, Filipe Marques Mota, Jin Young Kim, Dong Ha Kim

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Alkaline water electrolysis is the most promising technology for green-hydrogen production, which is considered a cornerstone of carbon-neutral energy society. In the development of functional catalysts able to overcome the sluggish kinetics of the alkaline hydrogen evolution reaction (HER), MXenes emerge as attractive support candidates with distinctive hydrophilicity, high conductivity, and high (electro)chemical stability. Herein, we assess the promise of three-dimensionally interconnected Ti3C2Tx MXenes with distinct surface terminations (-O, -OH, and -F) as efficient support materials for Pt-loaded alkaline HER catalysts. In particular, our OH-functionalized Pt/Ti3C2(OH)x shows the highest HER activity (30 mV dec−1), unlocking a competitive performance against the Pt/C reference (61 mV dec−1) and benchmark literature reports. The outstanding performance is ascribed to the cooperative effects of the extended MXene surface area and established interactions between Pt and Ti(OH)x surface centers. In parallel, the oxophilic nature of Ti3C2(OH)x facilitates Pt dispersion, presumably playing a key role in the extended catalytic stability here reported. The superior activity is further substantiated by density functional theory calculations, with the modeled Pt/Ti3C2(OH)2 unveiling a significantly higher onset potential and the weakest hydrogen binding energy over supported Pt nanoparticles (−2.51 eV) against both -O (−2.72 eV) and -F (−3.15 eV) functionalized counterparts.

Original languageEnglish
Pages (from-to)5328-5336
Number of pages9
JournalJournal of Materials Chemistry A
Volume11
Issue number10
DOIs
StatePublished - 17 Feb 2023

Bibliographical note

Funding Information:
The work was supported by the National Research Foundation (NRF) of Korea Grant funded by the Korean Government (2020R 1A 2C 3003958), by the Basic Science Research Program (Priority Research Institute) through the NRF funded by the Ministry of Education (2021R1A6A1A10039823), and by the Korea Basic Science Institute (National Research Facilities and Equipment Center) grant funded by the Ministry of Education (2020R1A6C101B194). F. M. M. acknowledges the support by the Brain Pool Program through the NRF funded by the Ministry of Science and ICT (2017H1D3A1A02054206). The work was also supported by the KIST Institutional Program (2E31871) and by the program of Future Hydrogen Original Technology Development (NRF-2021M3I3A1082879) through the NRF funded by the Korea government (Ministry of Science and ICT). This work was also financially supported by the NRF grant funded by the Korea government (MSIT) (NRF-2020R1A2C1099711). This work was supported by the Korea Institute Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (no. 20213030030260).

Publisher Copyright:
© 2023 The Royal Society of Chemistry

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