Nitrogen-Doped Carbon Nanofiber/Molybdenum Disulfide Nanocomposites Derived from Bacterial Cellulose for High-Efficiency Electrocatalytic Hydrogen Evolution Reaction

Abstract

To remit energy crisis and environmental deterioration, non-noble metal nanocomposites have attracted extensive attention, acting as a fresh kind of cost-effective electrocatalysts for hydrogen evolution reaction (HER). In this work, hierarchically organized nitrogen-doped carbon nanofiber/molybdenum disulfide (pBC-N/MoS2) nanocomposites were successfully prepared via the combination of in situ polymerization, high-temperature carbonization process, and hydrothermal reaction. Attributing to the uniform coating of polyaniline on the surface of bacterial cellulose, the nitrogen-doped carbon nanofiber network acts as an excellent three-dimensional template for hydrothermal growth of MoS2 nanosheets. The obtained hierarchical pBC-N/MoS2 nanocomposites exhibit excellent electrocatalytic activity for HER with small overpotential of 108 mV, high current density of 8.7 mA cm(-2) at η = 200 mV, low Tafel slope of 61 mV dec(-1), and even excellent stability. The greatly improved performance is benefiting from the highly exposed active edge sites of MoS2 nanosheets, the intimate connection between MoS2 nanosheets and the highly conductive nitrogen-doped carbon nanofibers and the three-dimensional networks thus formed. Therefore, this work provides a novel strategy for design and application of bacterial cellulose and MoS2-based nanocomposites as cost-effective HER eletrocatalysts.

Phosphorus‐Doped MoS2 Nanosheets Supported on Carbon Cloths as Efficient Hydrogen‐Generation Electrocatalysts

“…%) is neededt oe nhancet he number of active catalytic sites and to improvethe conductivity and, thus, to achieves uperior electrochemical HER activityo fM oS 2 nanosheets directly synthesized on carbon cloths as an integrated electrode system.A ss hown in SupportingI nformation Ta ble S1,b yu sing the adopted simple low-temperature annealing process, the HER performance of as-prepared P-MoS 2 nanosheets on CC is comparable or even better than others reportedi nt he literature. [13,17,[35][36][37] To further study the difference in their intrinsic properties, the electrochemical active surface area (ECSA)e stablished from the electrochemical double-layer capacitance of the catalysts urfacew as as well utilized to compare the differencei nc atalytic active sites. [38] As ECSAi sp roportional to the electrochemical double-layerc apacitance (C dl ) in the non-Faradaic potential region, herein, cyclic voltammogram (CV) curveswith various scan rates were measured to calculate the C dl values.…”

Carbon Aerogels Derived from Bacterial Cellulose/Polyimide Composites as Versatile Adsorbents and Supercapacitor Electrodes

“…Benefitting from the unique microbial fermentation process, [16] bacterial cellulose (BC) consisting of high-content superfine nanofibers with 40-60 nm in diameter is free of lignin/semicellulose, exhibiting large specifics urface area, high crystallinity and porosity. [17,18] Nitrogen-doped carbon networks have been obtained through the carbonization of polyaniline-coatedB C, which are directly used as excellent electrode materials for supercapacitors. [19] Wang et al prepared ultra-light nanocomposite aerogels consisting of BC and graphene oxide,s howing high sorptionc apacity (135-150 gg À1 )t oward organic liquids.…”

Carbon nanofiber activated by molybdenum disulfide as an effective binder‐free composite anode for highly reversible lithium storage

“…Figure 4C-F exhibits the high-resolution Mo 3d and S 2p XPS of MoS 2 /CNF-A and MoS 2 /CNF-B. Two refined peaks at 232.0 eV and 228.9 eV ( Figure 4C,D), respectively, correspond to Mo 4+ 3d 3/2 and Mo 4+ 3d 5/2 , 26,35 two peaks at 162.9 eV and 161.7 eV ( Figure 4E,F) are, respectively, assigned to S 2p 1/2 and S 2p 3/2 XPS. The above deconvoluted peaks of Mo and S are well match with 2H type MoS 2 .…”