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September 3, 2026Results in ChemistryOpen Access

Saccharin-assisted microstructural refinement enables enhanced hydrogen evolution reaction in electrodeposited NiCo thin films

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Authors

SBSetia BudiRHRaudhatul HadawiyahMMMokhamad Ali Rizqi Maulana

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Overview

Experimental study demonstrates enhanced hydrogen evolution activity in saccharin-refined NiCo thin films, highlighting additive-assisted electrodeposition for sustainable hydrogen catalysts.

Key Points

  • To evaluate the role of sodium saccharin as an additive in controlling the microstructural and electrocatalytic properties of electrodeposited NiCo thin films for the hydrogen evolution reaction.
  • Fabricated NiCo thin film electrocatalysts using electrodeposition with varying concentrations of sodium saccharin additive.
  • Characterized alloy microstructures, crystallite dimensions, dislocation density, and microstrain using X-ray diffraction.
  • Measured electrocatalytic performance, double-layer capacitance, and charge transfer resistance to determine hydrogen evolution activity.
  • Increasing saccharin concentration refined the NiCo microstructure into a defect-rich nanocrystalline alloy with reduced crystallite size, elevated dislocation density, and increased electrochemically active surface area.
  • The Ni75Co25 catalyst achieved the highest activity via a Volmer–Heyrovsky mechanism, delivering a current density of 30.43 mA cm−2 at 0.5 V, an overpotential of 253 mV, a Tafel slope of 70 mV dec−1, and the lowest charge transfer resistance.

Cite This Study

Budi et al. (2026) studied this question.

synapsesocial.com/papers/6a99352e636c6408cfa7d337https://doi.org/10.1016/j.rechem.2026.103824
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