Advanced Cu3Sn and Selenized Cu3Sn@Cu Foam as Electrocatalysts for Water Oxidation under Alkaline and Near-Neutral Conditions

Kannimuthu Karthick, Sengeni Anantharaj, Swathi Patchaiammal, Sathya Narayanan Jagadeesan, Piyush Kumar, Sivasankara Rao Ede, Deepak Kumar Pattanayak, Subrata Kundu*

*この研究の対応する著者

研究成果: Article査読

21 被引用数 (Scopus)

抄録

Water electrolysis is a field growing rapidly to replace the limited fossil fuels for harvesting energy in future. In searching of non-noble and advanced electrocatalysts for the oxygen evolution reaction (OER), here we highlight a new and advanced catalyst, selenized Cu3Sn@Cu foam, with overwhelming activity for OER under both alkaline (1 M KOH) and near-neutral (1 M NaHCO3) conditions. The catalysts were prepared by a double hydrothermal treatment where Cu3Sn is first formed which further underwent for second hydrothermal condition for selenization. For comparison, Cu7Se4@Cu foam was prepared by a hydrothermal treatment under the same protocol. The as-formed Cu3Sn@Cu foam, selenized Cu3Sn@Cu foam, and Cu7Se4@Cu foam were utilized as electrocatalysts and showed their potentiality in terms of activity and stability. In 1 M KOH, for attaining the benchmarking current density of 50 mA cm-2, selenized Cu3Sn@Cu foam required a low overpotential of 384 mV and increased charge transfer kinetics with a lower Tafel slope value of 177 mV/dec comparing Cu3Sn@Cu foam, Cu7Se4@Cu foam, and pristine Cu foam. Furthermore, potentiostatic analysis (PSTAT) was carried out for 40 h for selenized Cu3Sn@Cu foam and with minimum degradation in activity assured the long-term application for hydrogen generation. Similarly, under neutral condition selenized Cu3Sn@Cu foam also delivered better activity trend at higher overpotentials in comparison with others. Therefore, the assistance of both Sn and Se in Cu foam ensured better activity and stability in comparison with only selenized Cu foam. With these possible outcomes, it can also be combined with other active, non-noble elements for enriched hydrogen generation in future.

本文言語English
ページ(範囲)9490-9499
ページ数10
ジャーナルInorganic Chemistry
58
14
DOI
出版ステータスPublished - 2019 6月 25
外部発表はい

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 無機化学

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