Crystallinity and interfacial Mo–N–C bond engineered MoS2 embedded graphitic nitrogen doped carbon hollow sphere for enhanced HER activity

To restrain fossil fuel depletion, the need of the hour is the development of efficient, durable, and non-precious electrocatalysts for the hydrogen evolution reaction (HER). The hierarchical nanostructure consisting of transition metal dichalcogenides and graphitic heteroatom-doped carbon with an a...

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Published in:International journal of hydrogen energy 2024-02, Vol.56, p.570-581
Main Authors: Chanda, Kausik, Bairi, Partha, Maiti, Soumen, Tripathi, Anjana, Thapa, Ranjit, Ghosh, Shrabani, Panigrahi, Karamjyoti, Roy, Dipayan, Sarkar, Ratna, Chattopadhyay, Kalyan Kumar
Format: Article
Language:English
Subjects:
Crystallinity
Electrocatalysis
Hierarchical-structured
Hydrogen production
Interface
MoS2
Nitrogen-doped
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Summary:To restrain fossil fuel depletion, the need of the hour is the development of efficient, durable, and non-precious electrocatalysts for the hydrogen evolution reaction (HER). The hierarchical nanostructure consisting of transition metal dichalcogenides and graphitic heteroatom-doped carbon with an abundant interfacial M–N–C catalytic site is highly demanding for electrolytic applications. Herein, we report crystallinity-engineered ultrathin MoS2 nanosheets hierarchy over nitrogen-doped graphitic carbon (NC) hollow spheres as a promising material for HER. The well optimized NC@MoS2 demonstrates superior HER activity with a low onset overpotential of 9 mV and an overpotential of 145 mV at a current density of −10 mA cm−2. It exhibits low Tafel slope of 39 mV dec−1 and excellent chronoamperometric stability. Superior HER activity originates from interfacial Mo–N–C bonds. Density functional theory (DFT) calculations unveil that Mo–N–C bonds between MoS2 and NC matrix ease electronic transportation and further diminish Gibbs free energy for HER. [Display omitted] •Hierarchy of MoS2 Nanosheets (NSs) and polymer (PNMA) hollow spheres was realized.•Annealing altered crystallinity and convert of PNMA to N-doped carbon (NC).•Mo–N–C bond at interface of NC Matrix and MoS2 NSs eased charge transfer for HER.•Distinctive morphology of hybrid and NC provided more accessible catalytic site.•Durability in acidic electrolytes makes the hybrid a potential electrocatalyst.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2023.12.159