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Electrocatalytic hydrogen evolution using amorphous tungsten phosphide nanoparticles.

Joshua M McEnaney1, J Chance Crompton, Juan F Callejas

  • 1Department of Chemistry and Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA. schaak@chem.psu.edu.

Chemical Communications (Cambridge, England)
|August 8, 2014
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Summary
This summary is machine-generated.

Amorphous tungsten phosphide nanoparticles show promise as a new electrocatalyst for the hydrogen-evolution reaction. These WP/Ti electrodes achieve significant current densities at low overpotentials in acidic solutions.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • The hydrogen-evolution reaction (HER) is crucial for sustainable energy production.
  • Developing efficient and cost-effective electrocatalysts is essential for HER.
  • Tungsten phosphides are emerging as promising catalytic materials.

Purpose of the Study:

  • To investigate amorphous tungsten phosphide (WP) as a novel electrocatalyst for HER.
  • To synthesize WP as colloidal nanoparticles and evaluate their catalytic performance.
  • To assess the efficiency of WP in acidic aqueous solutions.

Main Methods:

  • Synthesis of amorphous tungsten phosphide (WP) as colloidal nanoparticles (average diameter 3 nm).
  • Fabrication of WP/Ti electrodes.
  • Electrochemical evaluation of HER activity in 0.50 M H2SO4(aq) using techniques like polarization curves.

Main Results:

  • Amorphous tungsten phosphide (WP) demonstrated significant electrocatalytic activity for HER.
  • WP/Ti electrodes achieved a current density of -10 mA cm(-2) at an overpotential of -120 mV.
  • Further increase in performance yielded -20 mA cm(-2) at -140 mV overpotential.

Conclusions:

  • Amorphous tungsten phosphide (WP) is a viable and effective electrocatalyst for the hydrogen-evolution reaction.
  • The nanoparticle form of WP exhibits excellent catalytic properties in acidic media.
  • WP represents a promising alternative to traditional noble metal catalysts for HER.