Efficient Hydrogen Evolution on Cu Nanodots-Decorated Ni₃S₂ Nanotubes by Optimizing Atomic Hydrogen Adsorption and Desorption

Abstract

Low-cost transition-metal dichalcogenides (MS) have attracted great interest as alternative catalysts for hydrogen evolution. However, a significant challenge is the formation of sulfur-hydrogen bonds on MS (S-H), which will severely suppress hydrogen evolution reaction (HER). Here we report Cu nanodots (NDs)-decorated NiS nanotubes (NTs) supported on carbon fibers (CFs) (Cu NDs/NiS NTs-CFs) as efficient electrocatalysts for HER in alkaline media. The electronic interactions between Cu and NiS result in Cu NDs that are positively charged and can promote water adsorption and activation. Meanwhile, NiS NTs are negatively charged and can weaken S-H bonds formed on catalyst surfaces. Therefore, the Cu/NiS hybrids can optimize H adsorption and desorption on electrocatalysts and can promote both Volmer and Heyrovsky steps of HER. The strong interactions between Cu and NiS cause the Cu NDs/NiS NTs-CFs electrocatalysts to exhibit the outstanding HER catalytic performance with low onset potential, high catalytic activity, and excellent stability.

Atomically Dispersed Mo Supported on Metallic Co9S8 Nanoflakes as an Advanced Noble‐Metal‐Free Bifunctional Water Splitting Catalyst Working in Universal pH Conditions

“…Additionally, the N 2 adsorption isotherms with the corresponding Brunauer-Emmett-Teller (BET) surface areas of Mo-Co 9 S 8 @C is 31.1, which is three times larger than that of the pristine Co 9 S 8 (10.1 m 2 g −1 in Figures S7 and S8, Supporting Information). [19] The characteristic lattice fringe of the (311) plane of cubic Co 9 S 8 are presented in high-resolution TEM (HRTEM) images of both pure Co 9 S 8 and Mo-Co 9 S 8 @C nanoflakes ( Figure S9, Supporting Information), implying that the single atom Mo modification does not alter the cubic crystal phase, which is consistent with X-ray diffraction (XRD) results. With the increased surface area and arrays-like structures, Mo-Co 9 S 8 @C might better facilitate electrolyte penetration and charge transfer.…”

Co3O4@Cu‐Based Conductive Metal–Organic Framework Core–Shell Nanowire Electrocatalysts Enable Efficient Low‐Overall‐Potential Water Splitting

“…The Cu 2p spectra of the three samples are compared in Figure a and Figure S8a in the Supporting Information, and show that both the CuCAT and Co 3 O 4 @CuCAT samples consist of two spin–orbit doublets characteristic of Cu 2+ and Cu + coupled to two weaker satellites . The binding energy of copper in CuCAT exhibits a negative shift to a lower binding energy after forming the hybrid Co 3 O 4 @CuCAT, which indicates that there exists electronic interactions between CuCAT and Co 3 O 4 . It should be noted that no copper element was observed in the Co 3 O 4 sample Additionally, the O1 peak of the O 1s spectrum of Co 3 O 4 @CuCAT exhibits a positive shift compared with that of pristine Co 3 O 4 (Figure b and Figure S8b).…”

Hatted 1T/2H‐Phase MoS2 on Ni3S2 Nanorods for Efficient Overall Water Splitting in Alkaline Media

“…As imilar XRD pat-tern for the S-Ni@NF sample is shown in Figure S2 (Supporting Information), except for the typical MoS 2 peak, indicating that the appearanceo fM oS 2 does not interferew itht he formation of Ni 3 S 2 on the Ni foam matrix. [3] The peaks at 198, 235, 285,a nd 336 cm À1 were attributedt ot he J 1 ,J 2 ,E 1g ,a nd J 3 bands of the 1T-phase MoS 2 , [35,41,43] and the peaks at 379 and 404 cm À1 were attributed to the E 1 2g andA 1g vibrational modes, respectively, of the 2H-phase MoS 2 . [3] The peaks at 198, 235, 285,a nd 336 cm À1 were attributedt ot he J 1 ,J 2 ,E 1g ,a nd J 3 bands of the 1T-phase MoS 2 , [35,41,43] and the peaks at 379 and 404 cm À1 were attributed to the E 1 2g andA 1g vibrational modes, respectively, of the 2H-phase MoS 2 .…”

“…[1][2][3][4][5] Innumerable publications have evidenced that the electrocatalytich ydrogen evolution reaction (HER) is an efficient and sustainable way to produce clean energy through water splitting. [1][2][3][4][5] Innumerable publications have evidenced that the electrocatalytich ydrogen evolution reaction (HER) is an efficient and sustainable way to produce clean energy through water splitting.…”