TY - JOUR
T1 - Efficient hydrogen evolution in transition metal dichalcogenides via a simple one-step hydrazine reaction
AU - Cummins, Dustin R.
AU - Martinez, Ulises
AU - Sherehiy, Andriy
AU - Kappera, Rajesh
AU - Martinez-Garcia, Alejandro
AU - Schulze, Roland K.
AU - Jasinski, Jacek
AU - Zhang, Jing
AU - Gupta, Ram K.
AU - Lou, Jun
AU - Chhowalla, Manish
AU - Sumanasekera, Gamini
AU - Mohite, Aditya D.
AU - Sunkara, Mahendra K.
AU - Gupta, Gautam
N1 - Funding Information:
This work was funded primarily by Los Alamos Directed Research Grant. This work was performed, in part, at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science. Los Alamos National Laboratory, an affirmative action equal opportunity employer, is operated by Los Alamos National Security, LLC, for the National Nuclear Security Administration of the US Department of Energy under contract DE-AC52-06NA25396. The authors would also like to acknowledge the Conn Center for Renewable Energy Research at the University of Louisville for facilities and access to characterization equipment. Development of samples and characterization was supported partially by DOE EPSCoR (DE-FG02-07ER46375) and by a graduate fellowship funded by NASA Kentucky under NASA award No: NNX10AL96H. We thank Dan Kelly and Joseph Dumont at Los Alamos National Laboratory for assistance with XPS analysis. We thank National Science Foundation NSF EPSCoR Grant 1355438 for supporting this work.
PY - 2016/6/10
Y1 - 2016/6/10
N2 - 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.
AB - 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.
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U2 - 10.1038/ncomms11857
DO - 10.1038/ncomms11857
M3 - Article
AN - SCOPUS:84974577379
VL - 7
JO - Nature Communications
JF - Nature Communications
SN - 2041-1723
M1 - 11857
ER -