Design and synthesis of NiS@CoS@CC with abundant heterointerfaces as high-efficiency hydrogen evolution electrocatalyst

Direct solvent free synthesis of bare α-NiS, β-NiS and α-β-NiS composite as excellent electrocatalysts: Effect of self-capping on supercapacitance and overall water splitting activity

“…The broad peak at 165.9 eV is associated with the oxidized species of sulfur (SO x 2− ) ( Fig. 5b) [65][66][67] . This observation lines up with the oxygen signal displayed at 529.9 eV.…”

Vertically aligned NiS2/CoS2/MoS2 nanosheet array as an efficient and low-cost electrocatalyst for hydrogen evolution reaction in alkaline media

“…S15 ) NSAs, which indicating abundant active sites, which is in good agreement with its enhanced alkaline HER performance. The turnover frequency (TOF) was calculated according to previously reported method [43,44]. In 1.0 mol L À1 KOH, the TOF value of NiS 2 /CoS 2 /MoS 2 NSAs was calculated to be 4.02 s À1 at ƞ = 300 mV, which was found to be higher than that of NiS Compared to the other non-precious metal based electrocatalysts for alkaline HER, as shown together in Table S1 Basing on the SEM and TEM characterizations, the vertically ori-ented metal molybdate NSAs which directly grown on the Ni foam were utilized as backbones for the synthesis of corresponding metal sulfide NSAs.…”

In Situ Sulfidation for Controllable Heterointerface of Cobalt Oxides–Cobalt Sulfides on 3D Porous Carbon Realizing Efficient Rechargeable Liquid-/Solid-State Zn–Air Batteries

“…By analyzing the O 1s curve of Co–S–O/NSCN, two peaks at 532.0 and 534.1 eV are assigned to the OH – species and OC bonds, and a characteristic peak corresponding to the Co–O bonds of CoO is situated at 530.0 eV, which is different from Co–S/NSCN . The high-resolution S 2p XPS spectra can be best split into four peaks in Figure c, where the peak binding energy (BE) of 161.8 eV is attributed to the Co–S bonds, indicating the formation of Co 9 S 8 species, and the other peaks are associated with C–S–C (163.7 and 165.0 eV) and C–SO x –C (168.9 eV) bonds. , As for the Co 2p XPS spectra of Co–S–O/NSCN in Figure d, the single peak at 778.6 eV is assigned to the metallic Co with zero valence state, and two obvious peaks at 781.6 and 797.3 eV are attributed to the Co 2p 3/2 and Co 2p 1/2 , as well as two broad satellite peaks. ,, Significantly, compared with the BE of 782.9 (Co 2p 3/2 ) and 799.0 eV (Co 2p 1/2 ) for Co–S/NSCN, there is an obvious positive shift of the two peaks in Co–S–O/NSCN, which can be explained by the strong electron interactions of Co 9 S 8 and CoO. , The changes in BEs manifest the transfer of partial electrons from CoO to Co 9 S 8 , confirming the formation of the atomic heterogeneous interface between Co 9 S 8 and CoO once again. Remarkably, the electron transfer between Co 9 S 8 and CoO would accordingly lead to a lopsided charge distribution, thus inducing a local interfacial electric field around the heterogeneous interface and accelerating the electron migration, which is beneficial to the electrochemical reaction.…”

“…(168.9 eV) bonds 51,52. As for the Co 2p XPS spectra of Co−S−O/NSCN in Figure3d, the single peak at 778.6 eV is assigned to the metallic Co with zero valence state, and two obvious peaks at 781.6 and 797.3 eV are attributed to the Co 2p 3/2 and Co 2p 1/2 , as well as two broad satellite peaks 46,47,53.…”