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 () and Gautam Gupta ()
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Dustin R. Cummins: Materials Physics and Applications (MPA-11), Los Alamos National Laboratory
Ulises Martinez: Materials Physics and Applications (MPA-11), Los Alamos National Laboratory
Andriy Sherehiy: Chemical Engineering and Conn Center for Renewable Energy Research, University of Louisville
Rajesh Kappera: Materials Physics and Applications (MPA-11), Los Alamos National Laboratory
Alejandro Martinez-Garcia: Chemical Engineering and Conn Center for Renewable Energy Research, University of Louisville
Roland K. Schulze: Materials Science and Technology (MST-6), Los Alamos National Laboratory
Jacek Jasinski: Chemical Engineering and Conn Center for Renewable Energy Research, University of Louisville
Jing Zhang: Materials Science and NanoEngineering, Rice University
Ram K. Gupta: Chemistry, Pittsburg State University
Jun Lou: Materials Science and NanoEngineering, Rice University
Manish Chhowalla: Materials Science and Engineering, Rutgers University
Gamini Sumanasekera: Chemical Engineering and Conn Center for Renewable Energy Research, University of Louisville
Aditya D. Mohite: Materials Physics and Applications (MPA-11), Los Alamos National Laboratory
Mahendra K. Sunkara: Chemical Engineering and Conn Center for Renewable Energy Research, University of Louisville
Gautam Gupta: Materials Physics and Applications (MPA-11), Los Alamos National Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-10

Abstract: 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 ∼100 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 MoOx core in the core-shell nanowires, which leads to improved electrocatalytic performance.

Date: 2016
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DOI: 10.1038/ncomms11857

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