Chemical and structural engineering of transition metal boride towards excellent and sustainable hydrogen evolution reaction
- Authors
- Dutta, Soumen; Han, HyukSu; Je, Minyeong; Choi, Heechae; Kwon, Jiseok; Park, Keemin; Indra, Arindam; Kim, Kang Min; Paik, Ungyu; Song, Taeseup
- Issue Date
- Jan-2020
- Publisher
- ELSEVIER
- Keywords
- Metal boride; Holey nanosheets; Hydrogen evolution reaction; Lower overpotential; Durability
- Citation
- NANO ENERGY, v.67
- Journal Title
- NANO ENERGY
- Volume
- 67
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/12418
- DOI
- 10.1016/j.nanoen.2019.104245
- ISSN
- 2211-2855
- 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.
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Collections - College of Science and Technology > Major in Ceramic Engineering > 1. Journal Articles
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