Modulation electronic structure of NiS nanoarray induced by Fe, V doping for high efficiency water and urea electrolysis

Water electrolysis for hydrogen production: from hybrid systems to self-powered/catalyzed devices

“…With respect to the UOR, the engineering of high-valence active sites can be achieved by hetero-element doping, alloying, and heterostructures. For example, the recently reported catalyst systems, such as Rh-doped NiFe-LDH, 171 Ru-Co 2 P/N-C/NF, 172 Fe, V doped NiS arrays, 173 V doped FeNi 3 N/Ni 3 N, 174 NiMoV LDH/NF with Mo and V dopants, 175 V-Ni 3 N/NF, 176 S-incorporated CoNiFe(oxy)hydroxides nanosheets, 177 and F-doped Ni(OH) 2 , 178 are all exhibit improved UOR performance. Wang et al developed a W-doped NiO (Ni-WO x ) catalyst, which demonstrated remarkably fast reaction kinetics and a high conversion frequency in urea oxidation, surpassing the performance of the catalysts without W elements.…”

Electrochemical deposition of nickel sulfide catalysts on commercial carbon rods as low-cost electrodes for hydrogen generation

“…Flower-like structures similar to those described in the research conducted by Zhang, Jing-Zhao et al [38] can be observed at higher magnification. Furthermore, the flower-like shape of the material enhances its electrochemical kinetics, capacitive performance, and mass transfer and provides more active sites [39,40]. Figures S2-S5 are the SEM-EDX images of the NiS/CR@300, NiS/CR@350, and NiS/CR@400.…”

Constructing a NiMnS electrode with a Mn-rich surface for hydrogen production in anion exchange membrane water electrolyzers

“…[18][19][20] Notably, the electrocatalytic activities of nickel sulfides under alkaline and neutral conditions are limited by the extremely high bond strength between Ni and H, which hinders the desorption of the hydrogen intermediate (H ads ) to form H 2 . 21 To solve this problem, foreign metal atoms have been doped into nickel sulfides 22,23 as these atoms can manipulate the electronic structure of the nickel sulfides, thereby optimizing the hydrogen adsorption kinetic energy. For instance, Li et al 24 designed a Mo-doped NiS and NiS 2 catalyst over a NiFe layered double hydroxide.…”