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

Journal Article · · Nature Communications
ORCiD logo [1];  [2];  [3];  [4];  [3];  [2];  [3];  [5];  [6];  [5];  [7];  [3];  [2];  [3];  [2]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Louisville, Louisville, KY (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Louisville, Louisville, KY (United States)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Rutgers Univ., Piscataway, NJ (United States)
  5. Rice Univ., Houston, TX (United States)
  6. Pittsburg State Univ., Pittsburg, KS (United States)
  7. Rutgers Univ., Piscataway, NJ (United States)

In this study, hydrogen evolution reaction is catalyzed 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 over potential 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.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1341863
Report Number(s):
LA-UR--16-23488
Journal Information:
Nature Communications, Journal Name: Nature Communications Vol. 7; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Hydrogen adsorption engineering by intramolecular proton transfer on 2D nanosheets journal May 2018
Electron density modulation of NiCo2S4 nanowires by nitrogen incorporation for highly efficient hydrogen evolution catalysis journal April 2018
Engineering stepped edge surface structures of MoS 2 sheet stacks to accelerate the hydrogen evolution reaction journal January 2017
A reduced graphene oxide/mixed-valence manganese oxide composite electrode for tailorable and surface mountable supercapacitors with high capacitance and super-long life journal January 2017
Direct deposition of MoSe 2 nanocrystals onto conducting substrates: towards ultra-efficient electrocatalysts for hydrogen evolution journal January 2017
Molybdenum disulfide and Au ultrasmall nanohybrids as highly active electrocatalysts for hydrogen evolution reaction journal January 2017
Highly dispersed palladium nanoparticles generated in situ on layered double hydroxide nanowalls for ultrasensitive electrochemical detection of hydrazine journal January 2017
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The atomic origin of nickel-doping-induced catalytic enhancement in MoS 2 for electrochemical hydrogen production journal January 2019
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