Local Surface Structure and Composition Control the Hydrogen Evolution Reaction on Iron Nickel Sulfides

Cameron L. Bentley, Corina Andronescu, Mathias Smialkowski, Minkyung Kang, Tsvetan Tarnev, Bernd Marler, Patrick R. Unwin, Ulf Peter Apfel, Wolfgang Schuhmann

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53 Citations (Scopus)

Abstract

In order to design more powerful electrocatalysts, developing our understanding of the role of the surface structure and composition of widely abundant bulk materials is crucial. This is particularly true in the search for alternative hydrogen evolution reaction (HER) catalysts to replace platinum. We report scanning electrochemical cell microscopy (SECCM) measurements of the (111)-crystal planes of Fe4.5Ni4.5S8, a highly active HER catalyst. In combination with structural characterization methods, we show that this technique can reveal differences in activity arising from even the slightest compositional changes. By probing electrochemical properties at the nanoscale, in conjunction with complementary structural information, novel design principles are revealed for application to rational material synthesis.

Original languageEnglish
Pages (from-to)4093-4097
Number of pages5
JournalAngewandte Chemie - International Edition
Volume57
Issue number15
DOIs
Publication statusPublished - 3 Apr 2018
Externally publishedYes

Keywords

  • electrocatalysis
  • hydrogen evolution reaction
  • iron nickel sulfides
  • SECCM
  • surfaces

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