Transition Metal‐Doped Edge‐Terminated MoS₂ Superstructures as Efficient Catalysts for H₂ Production

Abstract

As the most important layered transition metal dichalcogenide, molybdenum disulfide (MoS2) is applicable for simultaneous H2 production and CO elimination by water‐gas shift reaction (WGSR), while its performance is still not satisfactory. To further promote the catalytic activities of MoS2, herein a series of transition metals (M = Mn, Fe, Co, Ni, Cu, and Zn) into the column‐like superstructures with edge‐terminated MoS2 nanosheet building blocks (termed as M‐ET MoS2 SSs) is doped as the efficient catalysts for WGSR. A precise M doping into ET MoS2 SSs reveals that the M‐ET MoS2 SSs exhibit the volcano‐like activity toward WGSR as a function of specific M with the 5%Ni‐ET MoS2 SSs displaying the best average rate of 50.48 µmolH2 gcat. −1 s−1 in WGSR at 473 K, which is 4 and 13 times higher than those of the ET MoS2 SSs and commercial MoS2, respectively, and is even comparable to many noble‐metal‐based catalysts. The valence band spectra reveal that the boosted WGSR activity of 5%Ni‐ET MoS2 SSs can be ascribed to the downshift of the d‐band center relative to the Fermi level, which facilitates the H desorption to produce H2 in WGSR, showing a highly efficient and earth‐abundant catalysts for WGSR and beyond.

Efficient Photoelectrochemical Route for the Ambient Reduction of N2 to NH3 Based on Nanojunctions Assembled from MoS2 Nanosheets and TiO2

“…On the basis of density functional theory (DFT) calculations, Nørskov et al studied the prospect of electrochemically N 2 reduction to NH 3 at ambient conditions and envisage that Mo provides a lot of additional active surfaces for N 2 reduction. , A number of Mo-based catalysts has been developed for N 2 fixation. However, limited stability in reducing conditions and effective grafting of catalysts on electrodes are still challenging. − ,− Very recently, using the MoS 2 as the catalyst, the electrocatalytic NRR was indeed shown to be possible at environmental conditions while its NRR yield and product selectivity were still relatively low. , MoS 2 has been applied to photocatalysis as an effective cocatalyst because of its high conductivity and good H 2 evolution activity. As a 2D layered material, the MoS 2 layer can not only conduct electrons similarly to graphene but also serve as an active site for the nitrogen fixation reaction.…”

Effect of MoSe2 nanoribbons with NW30 edge reconstructions on the electronic and catalytic properties by strain engineering

“…32 Compared to 2D TMDs, 1D nanoribbons with a finite width and higher flexibility in spatial distribution resulting in relatively active sites through edge reconstructions, are considered as promising electrochemical catalysts. [33][34][35][36] Element doping, including transition metals (Pt, Fe, Co, Cu) [37][38][39] and nonmetal elements (B, C, N, P, and O), 16,40,41 at TMD edge defect sites is a feasible method for improving the catalytic performance. For instance, T 1 -vacancy termination modified by Pt atom at MoS 2 edges showed a lower overpotential of À0.10/0.46 V for the hydrogen/oxygen evolution reaction, comparable to precious metal catalysts.…”

Amorphous Doping Promotes Utilization of Fe‐Doped Amorphous Zr(HPO4)2 for Superb Water Oxidation Electrocatalysis

“…[6][7][8] Besides, the doped hetero-atoms could serve as active sites, inducing a giant advance in the catalytic activity enhancement. [9][10][11] Up to now, there are many researchers reported doping transition metals such as Fe, [12,13] Co, [14,15] Ni, [16,17] is reported to serve as OER catalysts, shows an overpotential of 410 mV at a current density of 3 mA cm −2 , [36] which is still far from a satisfactory electrocatalyst. Therefore, it is significant to design and utilize novel as well as earth-abundant α-ZrP with high electrochemical activity for the OER rationally.…”

“…[ 6–8 ] Besides, the doped hetero‐atoms could serve as active sites, inducing a giant advance in the catalytic activity enhancement. [ 9–11 ] Up to now, there are many researchers reported doping transition metals such as Fe, [ 12,13 ] Co, [ 14,15 ] Ni, [ 16,17 ] and Mn, [ 18 ] which can play an indispensable role in tuning the electrocatalytic activity. It is well known that the electrochemical reaction mainly occurs on the surface of the catalyst.…”