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Understanding catalyst structure is key for solar-to-fuel technologies. This study reveals how electrolyte choice impacts the intermediate-range structure of cobalt-based water-splitting catalysts, influencing their performance.

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Area of Science:

  • Materials Science
  • Catalysis
  • Nanotechnology

Background:

  • Improving solar-to-fuel conversion efficiency necessitates a deep understanding of catalyst structure-function relationships.
  • Beyond local atomic arrangements, the intermediate-range structural order of catalysts plays a critical role in their performance.

Purpose of the Study:

  • To investigate the nanoscale and intermediate-range structure of oxidic cobalt-based water-splitting catalysts.
  • To determine the influence of electrolyte composition on catalyst film structure.
  • To correlate structural differences with catalytic activity.

Main Methods:

  • X-ray pair distribution function (PDF) analysis was employed to probe the nanoscale order.
  • Catalyst films were prepared using different electrolytes (borate and phosphate).
  • Structural characterization was linked to catalytic activity measurements.

Main Results:

  • Significant electrolyte dependence was observed in the intermediate-range structure of the cobalt-based catalyst films.
  • Films formed in borate electrolyte (CoB(i)) showed coherent domains of 3-4 nm cobaltate clusters stacked up to three layers.
  • Films prepared in phosphate electrolyte (CoP(i)) exhibited smaller, non-coherently stacked clusters.

Conclusions:

  • The intermediate-range structure of cobalt-based water-splitting catalysts is tunable via electrolyte choice during film formation.
  • Differences in nanoscale and intermediate-range structural organization directly impact catalytic activity.
  • These findings provide crucial insights for designing more efficient solar-to-fuel catalysts.