Journal
JOURNAL OF POWER SOURCES
Volume 400, Issue -, Pages 190-197Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.08.028
Keywords
Overall water splitting; Bifunctional electrocatalyst; Co-3(PO4)(2) nanosheet arrays; Plasma treatment; Co3+-rich surfaces
Funding
- National Natural Science Foundation of China [21601136]
- National Program for Thousand Young Talents of China
- Tianjin Municipal Education Commission
- Tianjin Municipal Science and Technology Commission [15JCYBJC52600]
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Highly efficient and stable bifunctional electrocatalyst for overall water splitting (OWS) are vital for large-scale hydrogen production. Herein, we demonstrate a novel bifunctional electrocatalyst - Co-3(PO4)(2) nanosheet arrays - prepared by a combined hydrothermal growth and plasma treatment. Owing to the large surface area, enhanced conductivity, the abundance of coordinately unsaturated Co3+ sites and numerous oxygen vacancies, the plasma activated Co-3(PO4)(2) nanosheet arrays exhibit low overpotentials for oxygen evolution reaction (240 mV) and hydrogen evolution reaction (50 mV) at 10 mA cm(-2) with excellent stability. The overall performance is comparable to the best reports for precious-metal-free electrocatalysts. Also, the plasma activated Co-3(PO4)(2) nanosheet arrays show superior kinetics for hydrogen- and oxygen-evolution with Tafel slope values of 35 and 53 mV dec(-1), respectively. The overall-water-splitting, with 10 mA cm(-2) at a low voltage of 1.48 V, is achieved using the nanosheet arrays as both the anode and cathode and the performance surpasses that of the IrO2/C-Pt/C couple for sufficiently high overpotentials. This work presents a promising strategy for designing high-performance electrocatalysts toward overall water splitting.
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