Journal
NANO ENERGY
Volume 18, Issue -, Pages 1-11Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2015.10.001
Keywords
Hydrogen evolution reaction; Nanowire; Pyrite; Dopant; Component controllable synthesis; Three dimensional
Categories
Funding
- Key Grant Project of Chinese Ministry of Education [313046]
- National Natural Science Foundation of China [51471124, 51002115]
- Program for New Century Excellent Talents in University [NCET-12-0454]
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The ternary alloyed Co(SxSe1 - x)(2) nanowires (NWs) supported by carbon fiber paper (CFP) have been successfully synthesized. By adjusting the components of the NWs, it is found that the Co (S0.73Se0.27)(2) NWs on CFP exhibit the highest electrocatalytic activity towards hydrogen evolution reaction (HER). To drive the current density of 100 mV cm(-2), the Co(S0.73Se0.27)(2) NWs only require a small overpotential of 157 mV in 0.5 M H2SO4 solution and the corresponding Tafel slope is only 45.3 mV dec(-1). After 20 h continuous electrolysis or cycling for 5000 times in acid electrolyte, the robust catalytic activity is still perfectly preserved. DFT calculation results demonstrate that the high intrinsic activity of Co(S0.73Se0.27)(2) NWs towards HER is derived from the significant reduction of kinetic energy barrier induced by anion doping. This work presents a new efficient catalyst for HER and the anion doping strategy implemented here could be extended to other earth-abundant electrocatalysts to improve the catalytic performance. (C) 2015 Elsevier Ltd. All rights reserved.
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