Nitrogen-doped cobalt sulfide as an efficient electrocatalyst for hydrogen evolution reaction in alkaline and acidic media

Synthesis of High Entropy and Entropy-Stabilized Metal Sulfides and Their Evaluation as Hydrogen Evolution Electrocatalysts

“…Metal monosulfides have been previously reported as HER electrocatalysts in acidic conditions, although the literature in this area is limited (Table S9). Cobalt-, – silver-, , and copper , -based sulfides have been reported and we compared the η 10 to those found here. Co-based systems were found to yield η 10 between 97 and 198 mV, Cu-based systems in the range of 86–193 mV, and Ag-based systems as 193–199 mV.…”

Anion-exchange synthesis of an MnCo2S4 electrocatalyst towards facilitated ultralong hydrogen evolution reaction in acidic and alkaline media

“…A widely recognized occurrence of the HER mechanism on the cathode surface was unfolded through a multistep electrochemical process. The HER reaction proceeded via the 26 These reaction pathways give further insight into the catalyst's intrinsic reaction kinetics. Fig.…”

“…20,22 To boost the catalytic HER performance of MnCo 2 O 4 catalysts through the effective improvement of catalytic sites and conductivity for water dissociation by converting the catalyst into nitrides, phosphides, and/or sulfides. [23][24][25][26] Among these, sulfide formation is facile and could be more promising because the lone pair electrons in 3p and untenanted 3d orbital of sulfur are believed to facilitate the surface charge of the MnCo 2 S 4 catalyst, thereby enhancing HER activity. 27,28 Besides, the direct growth of the catalyst material on the three-dimensional (3D) nickel foam (NF) architecture could show better conductive and stable network for the efficient electron/ion transport.…”

Recent Advances in Co‐Based Electrocatalysts for Hydrogen Evolution Reaction

“…Cobalt sulfide is now emerging as an attractive HER catalyst, in which the S element has vacant 3d orbitals and two lone pair electrons in 3p orbitals that may facilitate surface charge state and persuade local charge density. [69,134] The Co sites in cobalt sulfide are generally considered the active centers due to their advantageous ΔG H values, the S sites seem inert for directly participating in the HER electrocatalysis. [135] Therefore, further regulation of the electron structure of the inert S-site to optimize its ΔG H to enhance the activity is necessary but still in challenge.…”

“…For instance, N dopants can improve the charge transfer kinetics of CoS 2 catalysts to promote efficient adsorption and activation of reactant molecules. [ 69 ] These modified surface chemistry properties enable enhanced HER catalytic activity in both alkaline and acidic electrolyte environments. Also, co‐doping of Fe and P into CoS 2 can significantly adjust the chemical bonds between Co and S/P by depleting the anti‐bonding e g * orbitals.…”