Nitrogen doped MoS 2 nanosheets synthesized via a low-temperature process as electrocatalysts with enhanced activity for hydrogen evolution reaction

Engineered 2D Transition Metal Dichalcogenides—A Vision of Viable Hydrogen Evolution Reaction Catalysis

“…Besides the transition metals, the doping of nonmetals such as O, B, Cl, Se, P, N, and C have also been investigated to improve the catalytic performance on HER. [ 95,97–99,101,105,115 ] Theoretical calculations suggested that the P dopants (substitutional replace S, Table 2) can be the new active site (Δ G H* of 0.04 eV) and offer the reduced Δ G H* (0.43 eV vs 2.2. eV of pristine one) of the neighboring S atoms favoring for the HER. [ 110 ] The Δ G H* can be further reduced to −0.11 eV by considering the layer expansion induced by the P dopant.…”

“…In 2017, Li et al revealed that the N doping (through the substitution of S) can lead to the decrease of the Δ G H* at the basal plane S atoms (0.71 eV vs 2.11 eV of pristine one, Table 2), while the N atom is inactive (Δ G H* of −1.43 eV). [ 115 ] Although the Δ G H* at the S atom is still high (0.71 eV), the N doped MoS 2 nanosheets showed a low Tafel slope of 45 mV dec −1 and low onset overpotential of 168 mV (at the j of 10 mA cm −2 ), which were largely improved from the pristine MoS 2 . [ 115 ] Unlike the P doped MoS 2 /WS 2 with significantly reduced Δ G H* , [ 110 ] the good catalytic performance on the HER of the N doped MoS 2 was also ascribed to the improved electrical conductivity upon the regulation of the electronic structure.…”

Synergistic Doping and Intercalation: Realizing Deep Phase Modulation on MoS2 Arrays for High‐Efficiency Hydrogen Evolution Reaction

“…[33][34][35] Then egligible HER activity of VG skeleton suggests that the VG is mainly used as ah ighly conductive support for active MoS 2 nanosheets.The excellent catalytic performance of (N,PO 4 3À )-MoS 2 /VGisattributed to the synergistic doping-intercalation effect and higher proportion of 1T-MoS 2 .T he HER performance of (N,PO 4 3À )-MoS 2 / VG is also better than those of reported Mo-based materials (Figure 4c)r eported previously. [36][37][38][39][40][41][42][43][44] To eliminate the influence of surface area and reveal the intrinsic catalytic behavior, turnover frequency (TOF) is calculated to gain the intrinsic per-site activity, [28,45] as shown in the Supporting Information, Figure S15. Impressively,t he TOFv alues of (N,PO 4 3À )-MoS 2 /VGa re larger than those of MoS 2 /VG, N- intercalation can essentially promote the activity for HER catalysis.T he cycling durability test was carried out at 10 mA cm À2 for 10 h, and there is no obvious decay observed for the all electrodes (Figure 4d), suggesting their excellent long-term stability.M oreover,c omparatively,t he S2pa nd Mo 3d XPS spectra of (N,PO 4 3À )-MoS 2 /VGa fter 1000 cycles (Supporting Information, Figure S16) do not change and all characteristic peaks are noticed, demonstrating its excellent stability.Furthermore,SEM image (Supporting Information, Figure S17) after 10 hs tability test reveals that the morphology of (N,PO 4 3À )-MoS 2 /VGa rray is well maintained, further suggesting its excellent structure stability.T ofurther study the superior HER performance of the (N,PO 4 3À )-MoS 2 /VG electrode,t he effective electrochemical active surface areas (ECSA) of these electrodes were calculated by monitoring the double-layer capacitance (C dl )according to the CV results at different scan rates (Supporting Information , Figure S18).…”

Nowotny phase Mo3+2xSi3C0.6 dispersed in a porous SiC/C matrix: A novel catalyst for hydrogen evolution reaction

“…Although a few precious metals, such as Pt, show high efficiency in the HER, their high cost and low abundance are severe hurdles for large-scale applications. 5,6 Inorganic molybdenum-based compounds, such as molybdenum carbide (Mo 2 C), 7,8 molybdenum boride (MoB), 7 molybdenum phosphide (MoP), [9][10][11] and molybdenum sulfides (MoS x ), [12][13][14] have drawn much attention recently as a possible replacement for Pt-catalysts, because of their d-band electronic density-of-state similar to that of Pt, 15,16 high electric conductivity, and low cost. Besides, in order to avoid aggregation and densification of Mo-based nanoparticles and to improve their intrinsic electric conductivity, carbon-based supports, 17 such as graphene [18][19][20][21] or carbon nanotubes, 18,[22][23][24] were used to disperse Mo-based nanoparticles.…”