Ternary nickel–iron sulfide microflowers as a robust electrocatalyst for bifunctional water splitting

Abstract

3D ternary nickel iron sulfide microflowers with a hierarchically porous structure have been directly grown on Ni foam via a convenient two-step method for efficient bifunctional water splitting.

Localized NiS2 Quantum Dots on g‐C3N4 Nanosheets for Efficient Photocatalytic Hydrogen Production from Water

“…For Ni 2p spectrum (Figure c), two typical peaks at 855.9 eV (Ni 2p 3/2 ) and 874.1 eV (Ni 2p 1/2 ) accompanied with two obvious satellite peaks are presented, certified the Ni(II) state . This chemical state was further validated by the high‐resolution S 2p scan, in which two typical (S 2 ) 2− peaks located at 162.7 and 163.9 eV were observed (see Figure d) . Moreover, another conspicuous peak observed at the range of 166–172 eV can be assigned to the oxidized metal sulfide species,, which is in accordance with the Ni 2p satellite signal shown in Figure c.…”

“…These signals derive from the sp 2 N atoms in triazine units, bridging N in N‐(C) 3 , N in the heterocycles and cyano groups (C−N−H), and π‐excitation in the polymeric g‐C 3 N 4 structures, respectively ,,,. For Ni 2p spectrum (Figure c), two typical peaks at 855.9 eV (Ni 2p 3/2 ) and 874.1 eV (Ni 2p 1/2 ) accompanied with two obvious satellite peaks are presented, certified the Ni(II) state . This chemical state was further validated by the high‐resolution S 2p scan, in which two typical (S 2 ) 2− peaks located at 162.7 and 163.9 eV were observed (see Figure d) .…”

Mo‐Doped Ni3S2 Nanowires as High‐Performance Electrocatalysts for Overall Water Splitting

“…Consequently, it is essential to fabricate nickel sulfides with well‐defined electronic nanostructures and morphologies to further increase their catalytic performances. On one hand, from the view of electronic structure level, the introduction of another metal atom has been demonstrated as an efficient strategy to increase the electrocatalytic activity due to the resulted optimized surface structure of the electrocatalysts after doping . For instance, Sun reported NiMoS 4 3D nanoarray, FeMoS 4 3D nanorod and CoMoS 4 3D nanotube array toward efficient hydrogen evolution, respectively, and provide further theoretical insight into the enhancement mechanism by density functional theory (DFT) calculations .…”

Co9S8‐Catalyzed Growth of Thin‐Walled Graphite Microtubes for Robust, Efficient Overall Water Splitting

“…[4][5][6][7] Twos imple reactions, the oxygen evolution reaction (OER) and hydrogen evolutionr eaction( HER), are critical for current energyc onversion technologies. [8][9][10][11][12] Co 9 S 8 is ap romising materialt hat has been demonstrated to have superb electrochemical performance for a varietyo fa pplications,f or instance, lithium-ion ands odium-ion batteries, supercapacitors, HER, and OER. However,t he high cost and limitedr eserves of noble metals greatlyp rohibit their largescale commercial applications.…”