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Hydrogen Evolution on Electrode‐Supported Pt n Clusters: Ensemble of Hydride States Governs the Size Dependent Reactivity

Journal Article · · Angewandte Chemie
 [1];  [2];  [3];  [2];  [4]
  1. Department of Chemistry and Biochemistry University of California, Los Angeles 607 Charles E. Young Drive 90095-1569 Los Angeles CA USA
  2. Department of Chemistry, University of Utah 315 South 1400 East 84112 Salt Lake City UT USA
  3. Department of Chemistry and Biochemistry University of California, Los Angeles 607 Charles E. Young Drive 90095-1569 Los Angeles CA USA, Department of Chemical and Biomolecular Engineering University of California, Los Angeles 5531 Boelter Hall 90095-1569 Los Angeles CA USA, California NanoSystem Institute University of California, Los Angeles 570 Westwood Plaza 90095-1569 Los Angeles CA USA
  4. Department of Chemistry and Biochemistry University of California, Los Angeles 607 Charles E. Young Drive 90095-1569 Los Angeles CA USA, California NanoSystem Institute University of California, Los Angeles 570 Westwood Plaza 90095-1569 Los Angeles CA USA

Abstract

We report the size‐dependent activity and stability of supported Pt 1,4,7,8 for electrocatalytic hydrogen evolution reaction, and show that clusters outperform polycrystalline Pt in activity, with size‐dependent stability. To understand the size effects, we use DFT calculations to study the structural fluxionality under varying potentials. We show that the clusters can reshape under H coverage and populate an ensemble of states with diverse stoichiometry, structure, and thus reactivity. Both experiment and theory suggest that electrocatalytic species are hydridic states of the clusters (≈2 H/Pt). An ensemble‐based kinetic model reproduces the experimental activity trend and reveals the role of metastable states. The stability trend is rationalized by chemical bonding analysis. Our joint study demonstrates the potential‐ and adsorbate‐coverage‐dependent fluxionality of subnano clusters of different sizes and offers a systematic modeling strategy to tackle the complexities.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0020125; AC02-05CH11231
OSTI ID:
1983511
Journal Information:
Angewandte Chemie, Journal Name: Angewandte Chemie Journal Issue: 20 Vol. 135; ISSN 0044-8249
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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Hydrogen Evolution on Electrode–Supported Ptn Clusters: Ensemble of Hydride States Governs the Size Dependent Reactivity
Journal Article · Wed Mar 15 00:00:00 EDT 2023 · Angewandte Chemie (International Edition) · OSTI ID:1963166

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