Ultrafast Growth of a Cu(OH)2-CuO Nanoneedle Array on Cu Foil for Methanol Oxidation Electrocatalysis

Sengeni Anantharaj, Hisashi Sugime, Suguru Noda, Suguru Noda

Research output: Contribution to journalArticlepeer-review

Abstract

A swift potentiostatic anodization method for growing a 5-7 μm tall nanoneedle array of Cu(OH)2-CuO on Cu foil within 100 s has been developed. This catalytic electrode when screened for methanol oxidation electrocatalysis in 1 M KOH with 0.5 M methanol, delivered a current density as high as 70 ± 10 mA cm-2 at 0.65 V versus Hg/HgO which is superior to the performance of many related catalysts reported earlier. The observed activity enhancement is attributed to the formation of both Cu(OH)2-CuO nanoneedle arrays of high active surface area over the metallic Cu foil. In addition, the Cu(OH)2-CuO/Cu electrode had also exhibited excellent stability upon prolonged potentiostatic electrocatalytic oxidation of methanol while retaining the charge-transfer characteristics. Growth of such highly ordered assembly of Cu(OH)2-CuO nanoneedles within a minute has never been achieved before. When compared to its oxygen evolution reaction activity, the addition of 0.5 M methanol has lowered the overpotential at 10 mA cm-2 by 334 mV, which is significant. This encourages the use of methanol as a sacrificial anolyte for energy-saving production of H2 from water electrolysis.

Original languageEnglish
Pages (from-to)27327-27338
Number of pages12
JournalACS Applied Materials and Interfaces
Volume12
Issue number24
DOIs
Publication statusPublished - 2020 Jun 17

Keywords

  • Cu(OH)-CuO nanoneedles
  • OER masking
  • anodization
  • electrocatalysis
  • methanol oxidation

ASJC Scopus subject areas

  • Materials Science(all)

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