Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7709512 | International Journal of Hydrogen Energy | 2017 | 10 Pages |
Abstract
Molybdenum oxide and molybdenum carbide coated carbon black (MoO2-Mo2C/C) non-noble metal hybrid electrocatalyst for hydrogen evolution reaction (HER) was synthesized from a mixture of metal molybdenum (Mo) powders and carbon black particles by a spark plasma coating (SPC) method. After the SPC process, the MoO2-Mo2C coating can anchor strongly on carbon black with the help of intermediate products Mo2C. The MoO2-Mo2C/C electrocatalyst exhibited a good HER performance with an onset overpotential of â121Â mV, a high exchange current density of 6.8Â ÃÂ 10â2Â mAÂ cmâ2 and a Tafel slope of â69Â mVÂ decâ1 in 0.5Â MÂ H2SO4 solution. In addition, the MoO2-Mo2C/C showed much higher stability than Pt/C (20Â wt% Pt supported on Vulcan XC-72 carbon black) after 3000 cycles of accelerated durability tests. The enhanced electrocatalytic activity and stability of MoO2-Mo2C/C electrocatalyst toward HER may originate from the Mo2C active sites formed in the process of SPC, and the effectively anchoring effect of MoO2-Mo2C coating on carbon black.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Electrochemistry
Authors
Yan Zhang, Jianbing Zang, Chan Han, Shaopei Jia, Pengfei Tian, Hongwei Gao, Yanhui Wang,