Journal
ELECTROCHIMICA ACTA
Volume 148, Issue -, Pages 170-174Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2014.09.164
Keywords
Hydrogen evolution; Wide pH range; Cubic cattierite; Cobalt disulfide; Electrocatalyst
Categories
Funding
- 973 Program [2011CBA00503, 2011CB932403]
- Program for Changjiang Scholars and Innovative Research Team in the University
- Fundamental Research Funds for the Central Universities
- NSFC
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Highly-crystallized cubic cattierite CoS2 pyramids were deposited on Ti foil via a simple hydrothermal method using CoCl2 and thiourea as precursors. Scanning electron microscopy (SEM) characterization revealed the morphology evolution from ramdom nanoparticles to micro-pyramids with well defined facets. These CoS2 pyramids were applied as electrocatalysts for hydorgen evolution reaction (HER) and showed very different acidic HER performance. The sample prepared at 15 h reaction time showed the best performance with an onset overpotential as low as 81 mV and a Tafel slope of similar to-72 mV/dec. The activity was kept almost 89% even after working for 30,000 seconds. Further study showed that these CoS2 pyramids also functioned well in neutral (1.0 M potassium phosphate buffer solution, pH = 7.00) and alkaline (1.0 M KOH solution, pH = 13.57) conditions. The cubic cattierite-type CoS2 can work as a novel HER electrocatalyst over the wide pH range from 0 to 14, combined with its easy-synthesis, low-cost and high stability, which can potentially serve as a ready-to-go HER catalyst for practical utilization. (C) 2014 Elsevier Ltd. All rights reserved.
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