MoS2 Decorated Carbon Nanofibers as Efficient and Durable Electrocatalyst for Hydrogen Evolution Reaction

Abstract

Abstract:Hydrogen is an efficient fuel which can be generated via water splitting, however hydrogen evolution occurs at high overpotential, and efficient hydrogen evolution catalysts are desired to replace state-of-the-art catalysts such as platinum. Here, we report an advanced electrocatalyst that has low overpotential, efficient charge transfers kinetics, low Tafel slope and durable. Carbon nanofibers (CNFs), obtained by carbonizing electrospun fibers, were decorated with MoS 2 using a facile hydrothermal method. The imaging of catalyst reveals a flower like morphology that allows for exposure of edge sulfur sites to maximize the HER process. HER activity of MoS 2 decorated over CNFs was compared with MoS 2 without CNFs and with commercial MoS 2 . MoS 2 grown over CNFs and MoS 2 -synthesized produced about 374 and 98 times higher current density at −0.30 V (vs. Reversible Hydrogen Electrode, RHE) compared with the MoS 2 -commercial sample, respectively. MoS 2 -commercial, MoS 2 -synthesized and MoS 2 grown over CNFs showed a Tafel slope of 165, 79 and 60 mV/decade, capacitance of 0.99, 5.87 and 15.66 mF/cm 2 , and turnover frequency of 0.013, 0.025 and 0.54 s −1 , respectively. The enhanced performance of MoS 2 -CNFs is due to large electroactive surface area, more exposure of edge sulfur to the electrolyte, and easy charge transfer from MoS 2 to the electrode through conducting CNFs.

Structure Engineering of MoS2 via Simultaneous Oxygen and Phosphorus Incorporation for Improved Hydrogen Evolution

“…While an additional peak can be identified at 163.6 eV after fitting the S 2p spectra. In accordance with related literature, it is attributed to the edge S . More significantly, integral calculation on the peak area shows that O,P‐MoS 2 have 19.06% edge S, yet the percentage of edge S for O‐MoS 2 is 14.69%.…”

Using Si/MoS2 Core-Shell Nanopillar Arrays Enhances SERS Signal

“…Figure 3 b shows that S 2p 1/2 and S 2p 3/2 are located near the energy of 162.2 and 161.2 eV, respectively. These peak positions are in good agreement with the results of previous relevant reports, which also determine the MoS 2 is in 1T stacked structure in this study [ 27 , 28 , 29 ]. On the other hand, all peaks of the planar MoS 2 are slightly lower than that of Si/MoS 2 core-shell NP arrays.…”

MoS2 Nanosheets Decorated Multi‐walled Carbon Nanotube Composite Electrocatalyst for 4‐Nitrophenol Detection and Hydrogen Evolution Reaction

“…The electrochemical surface area (ECSA) was calculated using the formula C dl / specific capacitance (C s ). The C s was calculated as 40 μF/cm 2 [42]. The calculated ECSA of MoS 2 and MWCNTs/MoS 2 composite was 0.098 cm 2 and 0.207 cm 2 , respectively.…”