Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7706136 | International Journal of Hydrogen Energy | 2018 | 8 Pages |
Abstract
The development of photoelectrodes capable of light-driven hydrogen evolution from water with non-noble metals is an important approach for the storage of solar energy in the form of a chemical energy carrier. In this study, we report Co nanoparticles@N-doped carbon coated on carbon nanotube@defective-silica (CNTs@Co@NC/D-SiO2), which are composed of Co nanoparticles@N-doped carbon as electrocatalyst, defective-silica as photocatalyst and carbon nanotube as conductive substrates. The obtained non-noble photocathode possesses the high performance for efficient photoelectrochemical hydrogen evolution reaction. When evaluated for hydrogen evolution reaction electrocatalysis, CNTs@Co@NC/D-SiO2 exhibits a small onset overpotential of 104Â mVÂ (JÂ =Â 1Â mAÂ cmâ2), a Tafel slope of 69.1Â mVÂ decâ1 and outstanding long-term cycling stability. The P type semiconductor characteristics of CNTs@Co@NC/D-SiO2 due to defective-silica with carrier concentration of 3.53Â ÃÂ 1019Â cmâ3 is measured, which produces a significant positive shift of overpotential of 40Â mVÂ (JÂ =Â 10Â mAÂ cmâ2) under 100Â mWÂ cmâ2 simulated sunlight irradiation. These findings provide a straightforward and effective route to produce cheap and efficient photo-electro-catalyst for water splitting.
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Authors
Aili Wang, Lili Zhao, Jiayuan Yu, Weijia Zhou, Benli Chu, Hong Liu,