Drop-casted Platinum Nanocube Catalysts for Hydrogen Evolution Reaction with Ultrahigh Mass Activity

Bonhyeong Koo, Jinwoo Chu, Jongsu Seo, Gihun Jung, Seung Hee Baek, Sung Wook Nam, Calem Duah, Young Kuk Lee, Woo Chul Jung, Byungha Shin

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Platinum hydrogen evolution reaction (HER) electrocatalysts in the form of nanocubes (NCs) were synthesized at 50 °C by aqueous-based colloidal synthesis and were applied to electrochemical (EC) and photoelectrochemical (PEC) systems by a fast and simple drop-casting method. A remarkable Pt mass activity of 1.77 A mg−1 at −100 mV was achieved in EC systems (fluorine-doped tin oxide/Pt NC cathode) with neutral electrolyte while maintaining low overpotential and Tafel slope. In the Cu(In,Ga)(S,Se)2 (CIGS)-based PEC system, a carefully chosen amount of Pt NC loading to achieve a compromise between the catalytic activity (more Pt NCs) and better light transmittance (fewer Pt NCs) led to a maximum onset potential of 0.678 V against the reference hydrogen electrode. The photoelectrodes with Pt NCs also exhibited good long-term operational stability over 9.5 h with negligible degradation of the photocurrent. This study presents an effective strategy to greatly reduce the use of expensive Pt without compromising the catalytic performance because the drop-casting of Pt NC solutions to form electrocatalysts is expected to waste less raw material than vacuum deposition.

Original languageEnglish
Pages (from-to)2585-2590
Number of pages6
JournalChemSusChem
Volume14
Issue number12
DOIs
StatePublished - 21 Jun 2021

Keywords

  • drop-casting
  • hydrogen reduction
  • nanocubes
  • photoelectrochemistry
  • water splitting

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