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Title: Cobalt phosphide based nanostructures as bifunctional electrocatalysts for low temperature alkaline water splitting

Abstract

Cobalt phosphide based thin films and nanoparticles were prepared by the thermal phosphidation of spinel Co 3O 4 precursor films and nanoparticles, respectively. CoP films were prepared with overall retention of the Co 3O 4 nanoplatelet morphology while the spherical/cubic Co 3O 4 and Ni 0.15Co 2.85O 4 nanoparticles were converted to nanorods or nanoparticles, respectively. The inclusion of nickel in the nanoparticles resulted in a 2.5 fold higher surface area leading to higher gravimetric performance. In each case high surface area structures were obtained with CoP as the primary phase. All materials were found to act as effective bifunctional electrocatalysts for both the HER and the OER and compared well to commercial precious metal benchmark materials in alkaline electrolyte. As a result, a symmetrical water electrolysis cell prepared from the CoP-based film operated at a low overpotential of 0.41-0.51 V.

Authors:
 [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1341751
Report Number(s):
SAND2017-0770J
Journal ID: ISSN 1938-6737; 650698
Grant/Contract Number:
AC04-94AL85000
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
ECS Transactions (Online)
Additional Journal Information:
Journal Name: ECS Transactions (Online); Journal Volume: 75; Journal Issue: 14; Journal ID: ISSN 1938-6737
Publisher:
Electrochemical Society
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 30 DIRECT ENERGY CONVERSION

Citation Formats

Lambert, Timothy N., Vigil, Julian A., and Christensen, Ben. Cobalt phosphide based nanostructures as bifunctional electrocatalysts for low temperature alkaline water splitting. United States: N. p., 2016. Web. doi:10.1149/07514.1137ecst.
Lambert, Timothy N., Vigil, Julian A., & Christensen, Ben. Cobalt phosphide based nanostructures as bifunctional electrocatalysts for low temperature alkaline water splitting. United States. doi:10.1149/07514.1137ecst.
Lambert, Timothy N., Vigil, Julian A., and Christensen, Ben. Mon . "Cobalt phosphide based nanostructures as bifunctional electrocatalysts for low temperature alkaline water splitting". United States. doi:10.1149/07514.1137ecst. https://www.osti.gov/servlets/purl/1341751.
@article{osti_1341751,
title = {Cobalt phosphide based nanostructures as bifunctional electrocatalysts for low temperature alkaline water splitting},
author = {Lambert, Timothy N. and Vigil, Julian A. and Christensen, Ben},
abstractNote = {Cobalt phosphide based thin films and nanoparticles were prepared by the thermal phosphidation of spinel Co3O4 precursor films and nanoparticles, respectively. CoP films were prepared with overall retention of the Co3O4 nanoplatelet morphology while the spherical/cubic Co3O4 and Ni0.15Co2.85O4 nanoparticles were converted to nanorods or nanoparticles, respectively. The inclusion of nickel in the nanoparticles resulted in a 2.5 fold higher surface area leading to higher gravimetric performance. In each case high surface area structures were obtained with CoP as the primary phase. All materials were found to act as effective bifunctional electrocatalysts for both the HER and the OER and compared well to commercial precious metal benchmark materials in alkaline electrolyte. As a result, a symmetrical water electrolysis cell prepared from the CoP-based film operated at a low overpotential of 0.41-0.51 V.},
doi = {10.1149/07514.1137ecst},
journal = {ECS Transactions (Online)},
number = 14,
volume = 75,
place = {United States},
year = {Mon Aug 22 00:00:00 EDT 2016},
month = {Mon Aug 22 00:00:00 EDT 2016}
}

Journal Article:
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