Journal
JOURNAL OF POWER SOURCES
Volume 279, Issue -, Pages 620-625Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2015.01.009
Keywords
Cobalt-Boride; Electrocatalyst; Hydrogen evolution reaction; Water splitting
Funding
- UGC-UPE Green Technology Project, India
- PAT (Provincia Autonoma di Trento) project ENAM
- Istituto PCB of CNR (Italy)
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This work presents Cobalt-Boride (Co-B) as a non-noble, efficient and robust electrocatalyst for Hydrogen Evolution Reaction (HER) active in aqueous solution of wide pH values. In neutral solution, amorphous Co-B nanoparticles (30-50 nm size) generate high current density (10 mA/cm(2)) at low overpotential (250 mV) with Tafel slope of 75 mV/dec following Volmer-Heyrovsky reaction mechanism. Highly active Co surface sites created by electronic transfer from B to Co (as inferred from XPS analysis and supported by theoretical calculations) are responsible for this significant HER activity in wide range of pH (4-9) values. Stability and reusability tests also demonstrate the robust nature of the catalyst. (C) 2015 Elsevier B.V. All rights reserved.
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