Highly active and stable hybrid catalyst of cobalt-doped FeS2 nanosheets-carbon nanotubes for hydrogen evolution reaction

Di Yan Wang, Ming Gong, Hung Lung Chou, Chun Jern Pan, Hsin An Chen, Yingpeng Wu, Meng Chang Lin, Mingyun Guan, Jiang Yang, Chun Wei Chen, Yuh Lin Wang, Bing Joe Hwang, Chia Chun Chen, Hongjie Dai

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521 Citations (Scopus)

Abstract

Hydrogen evolution reaction (HER) from water through electrocatalysis using cost-effective materials to replace precious Pt catalysts holds great promise for clean energy technologies. In this work we developed a highly active and stable catalyst containing Co doped earth abundant iron pyrite FeS2 nanosheets hybridized with carbon nanotubes (Fe1-xCoxS2/CNT hybrid catalysts) for HER in acidic solutions. The pyrite phase of Fe1-xCoxS2/CNT was characterized by powder X-ray diffraction and absorption spectroscopy. Electrochemical measurements showed a low overpotential of ∼0.12 V at 20 mA/cm2, small Tafel slope of ∼46 mV/decade, and long-term durability over 40 h of HER operation using bulk quantities of Fe0.9Co0.1S2/CNT hybrid catalysts at high loadings (∼7 mg/cm2). Density functional theory calculation revealed that the origin of high catalytic activity stemmed from a large reduction of the kinetic energy barrier of H atom adsorption on FeS2 surface upon Co doping in the iron pyrite structure. It is also found that the high HER catalytic activity of Fe0.9Co0.1S2 hinges on the hybridization with CNTs to impart strong heteroatomic interactions between CNT and Fe0.9Co0.1S2. This work produces the most active HER catalyst based on iron pyrite, suggesting a scalable, low cost, and highly efficient catalyst for hydrogen generation.

Original languageEnglish
Pages (from-to)1587-1592
Number of pages6
JournalJournal of the American Chemical Society
Volume137
Issue number4
DOIs
Publication statusPublished - 2015 Feb 4

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this

Wang, D. Y., Gong, M., Chou, H. L., Pan, C. J., Chen, H. A., Wu, Y., Lin, M. C., Guan, M., Yang, J., Chen, C. W., Wang, Y. L., Hwang, B. J., Chen, C. C., & Dai, H. (2015). Highly active and stable hybrid catalyst of cobalt-doped FeS2 nanosheets-carbon nanotubes for hydrogen evolution reaction. Journal of the American Chemical Society, 137(4), 1587-1592. https://doi.org/10.1021/ja511572q