1. Highly Crystallized Cubic Cattierite CoS2 for Electrochemically Hydrogen Evolution over Wide pH Range from 0 to 14.
- Author
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Zhang, Haichuan, Li, Yingjie, Zhang, Guoxin, Wan, Pengbo, Xu, Tianhao, Wu, Xiaochao, and Sun, Xiaoming
- Subjects
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CRYSTALLIZATION , *COBALT sulfide , *ELECTROCHEMICAL electrodes , *HYDROGEN , *PH effect , *TITANIUM , *METAL foils - Abstract
Highly-crystallized cubic cattierite CoS 2 pyramids were deposited on Ti foil via a simple hydrothermal method using CoCl 2 and thiourea as precursors. Scanning electron microscopy (SEM) characterization revealed the morphology evolution from ramdom nanoparticles to micro-pyramids with well defined facets. These CoS 2 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 ∼72 mV/dec. The activity was kept almost 89% even after working for 30,000 seconds. Further study showed that these CoS 2 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 CoS 2 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. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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