Dutta, Soumen ORCID: 0000-0003-1465-2723, Han, HyukSu, Je, Minyeong, Choi, Heechae ORCID: 0000-0002-9390-6607, Kwon, Jiseok, Park, Keemin, Indra, Arindam, Kim, Kang Min, Paik, Ungyu and Song, Taeseup (2020). Chemical and structural engineering of transition metal boride towards excellent and sustainable hydrogen evolution reaction. Nano Energy, 67. AMSTERDAM: ELSEVIER. ISSN 2211-3282

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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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Dutta, SoumenUNSPECIFIEDorcid.org/0000-0003-1465-2723UNSPECIFIED
Han, HyukSuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Je, MinyeongUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Choi, HeechaeUNSPECIFIEDorcid.org/0000-0002-9390-6607UNSPECIFIED
Kwon, JiseokUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Park, KeeminUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Indra, ArindamUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, Kang MinUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paik, UngyuUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Song, TaeseupUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-352467
DOI: 10.1016/j.nanoen.2019.104245
Journal or Publication Title: Nano Energy
Volume: 67
Date: 2020
Publisher: ELSEVIER
Place of Publication: AMSTERDAM
ISSN: 2211-3282
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
HIGHLY-ACTIVE ELECTROCATALYSTS; TOTAL-ENERGY CALCULATIONS; OXYGEN EVOLUTION; EFFICIENT ELECTROCATALYST; WATER; NANOSHEETS; FILMSMultiple languages
Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, AppliedMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/35246

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