Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 31, Issue 41, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202105287
Keywords
carbon nanohorns; functionalization; heterostructures; hydrogen evolution; molybdenum disulfide
Categories
Funding
- European Union (European Social Fund) [MIS 5033021]
- State Scholarships Foundation (IKY)
- Spanish MICINN [PID2019-104739GB-100/AEI/10.13039/501100011033]
- Government of Aragon (project DGA (FEDER, EU)) [E13-20R]
- European Union [823717]
- Graphene Flagship [881603]
- Operational Program Competitiveness, Entrepreneurship and Innovation (NSRF) [MIS 5002772]
- Ministry of Development and Investments
- European Union (European Regional Development Fund)
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The construction of 3D-2D CNH-MoS2 heterostructures by introducing complementary functional groups on the surfaces of carbon nanohorns and molybdenum disulfide enhances electrocatalytic activity for proton reduction, resulting in excellent stability and efficiency.
The realization of novel heterostructures arising from the combination of nanomaterials is an effective way to modify their physicochemical and electrocatalytic properties, giving them enhanced characteristics stemming from their individual constituents. Interfacing carbon nanohorns (CNHs) possessing high porosity, large specific surface area, and good electrical conductivity, with MoS2 owning multiple electrocatalytic active sites but lacking significant conductivity, robust interactions, and effective structure, can be a strategy to boost the electrocatalytic reduction of protons to molecular hydrogen. Herein, in a stepwise approach, complementary functional groups are covalently introduced at the conical tips and sidewalls of CNHs, along with the basal plane of MoS2, en route the construction of 3D-2D CNH-MoS2 heterostructures. The increased MoS2 loading onto CNHs, improving and facilitating charge delocalization and transfer in neighboring CNHs, along with the plethora of active sites, results in excellent electrocatalytic activity for protons reduction, same as that of commercial Pt/C. Minute overpotential is registered, low Tafel slope and small charge-transfer resistance for electrocatalyzing the evolution of hydrogen from the newly prepared heterostructure of 0.029 V, 71 mV dec(-1), and 34.5 omega, respectively. Furthermore, the stability of the 3D-2D CNH-MoS2 heterostructure is validated after performing 10 000 ongoing electrocatalytic cycles.
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