Chemical and structural engineering of transition metal boride towards excellent and sustainable hydrogen evolution reaction
- Title
- Chemical and structural engineering of transition metal boride towards excellent and sustainable hydrogen evolution reaction
- Author
- 백운규
- Keywords
- Metal boride; Holey nanosheets; Hydrogen evolution reaction; Lower overpotential; Durability
- Issue Date
- 2020-01
- Publisher
- ELSEVIER
- Citation
- NANO ENERGY, v. 67, article no. 104245
- Abstract
- Herein, holey, thin, conductive nickel substituted cobalt molybdenum boride (Ni-CMB) nanosheets have been designed to obtain superior electrochemical HER performance with small overpotential of 69 mV at 10 mA cm(-2) current density and lower Tafel slope of 76.3 mV dec(-1) in alkaline medium. Incorporation of Ni leads to improved conductivity and favorable hydrogen adsorption on Mo sites, which collectively yield efficient electrocatalytic H-2 production from Ni-CMB catalyst. The ultrathin nature (thickness = 5.0 nm) of the designed material expectedly helps to attain high exposure of active sites and facile charge transportation through the nanosheets. Additionally, the decorated mesopores (average size = 3.86 nm) on nanosheets have benefitted towards faster electrolyte diffusion, easy gas escape from catalyst surface to support high electrocatalytic performance. Finally, well-maintained morphology of the sample and evolution of HER active sites in the material have guaranteed long-term, sustainable hydrogen production even at high current densities, which clearly demonstrate its superiority over an expensive electrolyzer (Pt-C) in alkaline water.
- URI
- https://www.sciencedirect.com/science/article/pii/S2211285519309528?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/160950
- ISSN
- 2211-2855; 2211-3282
- DOI
- 10.1016/j.nanoen.2019.104245
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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