Few-Layered Trigonal WS2Nanosheet-Coated Graphite Foam as an Efficient Free-Standing Electrode for a Hydrogen Evolution Reaction
MetadataShow full item record
© 2017 American Chemical Society. Few-layered tungsten disulfide (WS 2 ) with a controlled-phase ratio (the highest trigonal-phase ratio being 67%) was exfoliated via lithium insertion. The exfoliated WS 2 nanosheets were then anchored onto three-dimensional (3D) graphite foam (GF) to fabricate free-standing binder-free electrodes. The 3D GF can increase the interfacial contact between the WS 2 nanosheets and the electrolyte and facilitate ion transfer. Without the nonconductive binder, an intimate contact between the WS 2 and GF interface can be created, leading to the improvement of electrical conductivity. In comparison to the pure WS 2 nanosheets, the overpotential for a hydrogen evolution reaction is significantly decreased from 350 mV to 190 mV at 10 mA/cm 2 , and no deactivation occurs after 1000 cycles. The density functional theory computations reveal that the efficient catalytic activity of the trigonal-phase WS 2 /GF electrode is attributed to the lower Gibbs free energy for H* adsorption and higher electrical conductivity.
Showing items related by title, author, creator and subject.
Islam, A.; Hwa Teo, S.; Awual, Rabiul ; Taufiq-Yap, Y.H. (2020)Since the complexity of photocatalyst synthesis process and high cost of noble cocatalyst leftovers a major hurdle to producing hydrogen (H2) from water, a noble metal-free Ni-Si/MgO photocatalyst was realized for the ...
Micro-/nano-structured hybrid of exfoliated graphite and Co3O4 nanoparticles as high-performance anode material for Li-ion batteriesZhao, Y.; Li, Y.; Ma, C.; Shao, Zongping (2016)A novel Co3O4 nanoparticles (NPs)/exfoliated graphite (EG) composite has been prepared through a stirring-assistant hydrothermal route and a subsequent post-anneal treatment. Results of microstructure characterizations ...
Duan, L.; Wang, H.; Liu, Jian; Zhang, Y. (2015)© 2015 IOP Publishing Ltd. Self-assembly of two-dimensional graphene nanosheets is an important strategy for obtaining graphene architectures for practical applications. However, construction of graphene self-assembled ...