Hydrogen evolution in alkaline medium on intratube and surface decorated PtRu catalyst

Farhan S.m. Ali, Ryan Lacdao Arevalo, Matthias Vandichel, Florian Speck, Eeva-leena Rautama, Hua Jiang, Olli Sorsa, Kimmo Mustonen, Serhiy Cherevko, Tanja Kallio (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

For anion exchange membrane (AEM) electrolysis, challenges include finding an optimal catalyst for hydrogen evolution reaction (HER), as the noble metals are scarce while non-noble metals are inferior. Here, the noble metal amount is reduced in a straightforward solution synthesis which produces Pt-Ru surface nanoparticles and unique intratube nanowires decorated on single walled carbon nanotubes (SWNT). In half-cell tests, 5 wt PtRu-% Pt-Ru SWNT demonstrates stable 10 mA cm −2 HER current at 46 mV overpotential and outperforms commercial electrocatalysts. When integrated in an AEM electrolyser, a high current density of 500 mA cm −2 at a low voltage of 1.72 V is achieved with 34 µg cm −2 metal loading. First-principles calculations reveal that both the Pt-Ru alloy nanoparticle and intratube nanowires promote near optimal H* binding energy, thereby releasing the H 2 faster. Thus, our approach yields an active low metal loading alkaline HER catalyst without sacrificing the performance in an AEM electrolyser.

Original languageEnglish
Article number121541
JournalApplied Catalysis B: Environmental
Volume315
DOIs
Publication statusPublished - 1 Oct 2022
MoE publication typeA1 Journal article-refereed

Keywords

  • Alkaline medium
  • Electrolyser
  • Hydrogen evolution reaction
  • Nanowire
  • Single walled carbon nanotubes

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