Hierarchical carbon-silicon nanowire heterostructures for the hydrogen evolution reaction
- Moon, Joonhee; Sim, Uk; Kim, Dong Jin; Ahn, Hyo-Yong; An, Junghyun; Ha, Heonjin; Choi, Kyoung Soon; Jeon, Cheolho; Lee, Jouhahn; Nam, Ki Tae; Hong, Byung Hee
- Issue Date
- Nanoscale, Vol.10 No.29, pp.13936-13941
- Silicon nanowires (SiNWs) opened up exciting possibilities in a variety of research fields due to their unique anisotropic morphologies, facile tuning capabilities, and accessible fabrication methods. The SiNW-based photoelectrochemical (PEC) conversion has recently been known to provide an efficiency superior to that of various photo-responsive semiconductor heterostructures. However, a challenge still remains in designing optimum structures to minimize photo-oxidation and photo-corrosion of the Si surface in a liquid electrolyte. Here, we report a simple method to synthesize hierarchically branched carbon nanowires (CNWs) on SiNWs utilizing copper vapor as the catalyst in a chemical vapor deposition (CVD) process, which exhibits outstanding photo catalytic activities for hydrogen generation along with excellent chemical stability against oxidation and corrosion. Thus, we believe that the CNW-SiNW photoelectrodes would provide a new route to developing high-performing cost-effective catalysts essential for advanced energy conversion and storage technologies.
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