Synergistic balancing hydrogen and hydroxyl adsorption/desorption of nickel sulfide via cation and anion dual-doping for boosting alkaline hydrogen evolution

Anion‐cation double‐substitution endows iron sulfide with remarkably enhanced specific capacity and rate performance as anode for supercapacitors

“…The electron interaction between *OH and FeS 2 is presumed to be the coupling between O 2p and the highest occupied d‐states ( E d ), which has been proposed in previous reports 43,44 . The higher energy of E d compared with E f results in a slighter filling of the antibonding states and the more forceful adsorption *OH 43,45,46 . Thus Ni doping can enhance *OH adsorption due to the slighter filling of antibonding states, which is demonstrated by the distribution of crystal orbital Hamilton populations (COHP) of Fe‐O bonds (Figure 4E).…”

“…43,44 The higher energy of E d compared with E f results in a slighter filling of the antibonding states and the more forceful adsorption *OH. 43,45,46 Thus Ni doping can enhance *OH adsorption due to the slighter filling of antibonding states, which is demonstrated by the distribution of crystal orbital Hamilton populations (COHP) of Fe-O bonds (Figure 4E). The stronger *OH adsorption can decrease the deprotonation energy, as shown in Figure 4F.…”

Active Sites Regulation for High-Performance Oxygen Evolution Reaction Electrocatalysts

“…Numerous studies revealed that the adsorption energy of intermediates has scale relation, such as ΔG(*OOH) = ΔG(*OH)+3.2, the ΔG *OOH can be restricted by ΔG *OH , which limit a minimum theoretical overpotential of about 0.37 V, and the adsorption energy of intermediates cannot be optimized independently on a catalyst composed of a single type of site. So the synergistic effect of multi-site was put forward to break or overcome the adsorption-energy scaling relations ( Song et al, 2021 ). Du et al design the NiO/NiFe LDH interface to introduce additional active sites, and the intermediates can be adsorbed by the interfacial dual-site, so the adsorption energy of each intermediate can be adjusted independently to decrease the overpotential into 0.2 V ( Figure 1D ) ( Gao et al, 2019 ).…”

Corrosive engineering assistedin situconstruction of an Fe–Ni-based compound for industrial overall water-splitting under large-current density in alkaline freshwater and seawater media

“…Therefore, it is urgent to realize alternative media in this eld to meet the growing demand for hydrogen. [23][24][25][26][27][28][29] Considering that seawater occupies about 96.5% of the total water reserves, along with the removal of complex desalination and purication technologies, direct water electrolysis in raw seawater is also highly favored in the industry. 30 The water electrolysis in freshwater will lay a foundation for seawater electrolysis.…”