Efficient hydrogen evolution in transition metal dichalcogenides via a simple one-step hydrazine reaction

Dustin R. Cummins, Ulises Martinez, Andriy Sherehiy, Rajesh Kappera, Alejandro Martinez-Garcia, Roland K. Schulze, Jacek Jasinski, Jing Zhang, Ram K. Gupta, Jun Lou, Manish Chhowalla, Gamini Sumanasekera, Aditya D. Mohite, Mahendra K. Sunkara, Gautam Gupta

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Abstract

Hydrogen evolution reaction is catalysed efficiently with precious metals, such as platinum; however, transition metal dichalcogenides have recently emerged as a promising class of materials for electrocatalysis, but these materials still have low activity and durability when compared with precious metals. Here we report a simple one-step scalable approach, where MoOx/MoS2 core-shell nanowires and molybdenum disulfide sheets are exposed to dilute aqueous hydrazine at room temperature, which results in marked improvement in electrocatalytic performance. The nanowires exhibit â '1/4100 mV improvement in overpotential following exposure to dilute hydrazine, while also showing a 10-fold increase in current density and a significant change in Tafel slope. In situ electrical, gate-dependent measurements and spectroscopic investigations reveal that hydrazine acts as an electron dopant in molybdenum disulfide, increasing its conductivity, while also reducing the MoO x core in the core-shell nanowires, which leads to improved electrocatalytic performance.

Original languageEnglish
Article number11857
JournalNature Communications
Volume7
DOIs
Publication statusPublished - Jun 10 2016

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ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Chemistry(all)
  • Physics and Astronomy(all)

Cite this

Cummins, D. R., Martinez, U., Sherehiy, A., Kappera, R., Martinez-Garcia, A., Schulze, R. K., ... Gupta, G. (2016). Efficient hydrogen evolution in transition metal dichalcogenides via a simple one-step hydrazine reaction. Nature Communications, 7, [11857]. https://doi.org/10.1038/ncomms11857