Nickel sulfide microsphere film on Ni foam as an efficient bifunctional electrocatalyst for overall water splitting

Abstract

Developing low-cost, efficient, and bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is an appealing yet challenging task. Herein, for the first time, a NiS microsphere film was grown in situ on Ni foam (NiS/Ni foam) via a sulfurization reaction as an efficient bifunctional electrocatalyst for overall water splitting with superior activity and good durability. This NiS/Ni foam electrode delivers 20 mA cm(-2) at an overpotential of 158 mV for the HER and 50 mA cm(-2) at an overpotential of 335 mV for the OER in 1.0 M KOH. This bifunctional electrode also enables a high-efficiency alkaline water electrolyzer with 10 mA cm(-2) at a cell voltage of only 1.64 V, which could be promising in water splitting devices for large-scale hydrogen production.

One‐Step Fabrication of Monolithic Electrodes Comprising Co9S8 Particles Supported on Cobalt Foam for Efficient and Durable Oxygen Evolution Reaction

“…According to the XRD analyses, the CF still comprised a mixture of fcc‐Co and hcp‐Co, but weak broadened diffraction peaks from β‐CoOOH (JCPDS no. 14‐0673) could also be resolved (Figure S14), consistent with previous reports . While for the Co@Co 9 S 8 electrodes, it was found that the particulate morphology disappeared after the extended OER electrolysis, and the surface of both Co@Co 9 S 8 ‐180 and Co@Co 9 S 8 ‐220 became smoother (Figure c and Figure S15 a).…”

NiFe/(Ni,Fe)3S2 Core/Shell Nanowire Arrays as Outstanding Catalysts for Electrolytic Water Splitting at High Current Densities

“…This high binding energy shift is smaller than the low binding energy shift, around 1 eV, observed for the before and after sulfurization case, implying partial transformation of the MS bonding of the sulfide shell to MO bonding after the stability test. This observation is consistent with the finding previously reported in relevant literature, in which oxyhydroxide thin layers were formed from sulfides after the OER stability test. The formation of the MO bonding, more resistant to the OER than the MS bonding, ensures the outstanding stability of the catalyst.…”

A Surfactant‐Free and Scalable General Strategy for Synthesizing Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheets for the Oxygen Evolution Reaction

“…To summarize,as eries of ultrathin MOF-74 nanosheets with abundant coordinatively unsaturated metal sites are synthesized through coordination assisted 2dOSA from their corresponding M-ONS,w hich cannot be obtained from the [39] a-CoSe/ Ti, [40] Co 9 S 8 /NOSC, [41] CoFePO, [42] CoP/NC, [43] CoNiP, [44] Ni-NiP, [44] Ni@NC-800/NF, [45] NiFeO x /CNF, [46] NiMo, [47] NiS/NF, [48] NiSe/NF, [49] N-Ni 3 S 2 -NF, [50] and Ni 5 P 4 . [51] delamination of their bulk counterparts or the conventional solvothermal method.…”