3D flexible hydrogen evolution electrodes with Se-promoted molybdenum sulfide nanosheet arrays

Abstract

Se-promoted molybdenum sulfide nanosheet arrays supported on carbon cloth are developed as a novel electrocatalyst for hydrogen evolution reaction.

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

“…[29,30] On the other hand, for the Mo 3d and S2ps pectra as shown in Figure 3b,c, at iny peak at 225.6 eV as well as strong peaks at 228.3 eV and 231.5 eV are visible, corresponding to the MoÀSb ond, and Mo 4 + specieso f Mo 3d 5/2 and Mo 3d 3/2 , [17] and another set of strongp eaks at 161.2 eV and 162.3 eV for 2p 3/2 and 2p 1/2 orbitals of S 2À species in undoped MoS 2 ,r espectively. [13,28] After Pd oping, the spectra of Mo 3d and S2po fM oS 2 are still similar to those of the undoped one, except for the apparent shifts in their binding energies. Explicitly,t he peaks of Mo 3d spectra are shiftedt o 226.0, 228.9, and 232.0 eV,c orrespondingly;a nd for the S2p spectra,t he peaks are movedt o1 61.7 eV and 162.9 eV,r espectively.These peak shifts may be related to the low-temperature annealing process, indicating that elemental substitution of P into Ss ites occurred in MoS 2 crystals during the doping process.…”

“…These additional crystal defects can be accredited to the elemental substitution of Pi nto Ss ites in MoS 2 microstructures. [28] Notably,b ased on the EDSm apping ( Figure 2c-e), all constituents, including the Pd opants, are uniformly distributed,i ndicating that the Pa toms are successfully and homogeneously doped into MoS 2 without deteriorating the nanosheet morphology.…”

“…This peak is believed to result from the surface oxidized phosphate species if P atoms are doped into the lattice of MoS 2 . On the other hand, for the Mo 3d and S 2p spectra as shown in Figure b,c, a tiny peak at 225.6 eV as well as strong peaks at 228.3 eV and 231.5 eV are visible, corresponding to the Mo−S bond, and Mo 4+ species of Mo 3d 5/2 and Mo 3d 3/2 , and another set of strong peaks at 161.2 eV and 162.3 eV for 2p 3/2 and 2p 1/2 orbitals of S 2− species in undoped MoS 2 , respectively . After P doping, the spectra of Mo 3d and S 2p of MoS 2 are still similar to those of the undoped one, except for the apparent shifts in their binding energies.…”

Non‐Noble Metal‐based Carbon Composites in Hydrogen Evolution Reaction: Fundamentals to Applications

“…Another important progress is the preparation of CC‐based binder‐free electrodes with multiple active components . Introducing dopants into the crystal lattice of the catalysts can regulate the electronic structure thus tuning the intrinsic activity.…”

RuP2‐Based Catalysts with Platinum‐like Activity and Higher Durability for the Hydrogen Evolution Reaction at All pH Values

“…[6] To solve such problems,earth-abundant non-Pt catalysts (Mo-, W-,Fe-, Co-, Ni-, and Cu-based materials) have been intensively studied. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] Nevertheless,t heir catalytic performance is still far from satisfactory in comparison with Pt, and most of them only show their best activity in acidic media. Considering the inevitable proton concentration change during the HER process,a ni deal electrocatalyst is expected to work well in different pH solutions so that the water splitting process can be more energy-efficient.…”