Nickel selenide supported on nickel foam as an efficient and durable non-precious electrocatalyst for the alkaline water electrolysis

Kinetically Controlled Coprecipitation for General Fast Synthesis of Sandwiched Metal Hydroxide Nanosheets/Graphene Composites toward Efficient Water Splitting

“…Remarkably, NiCo‐HS@G delivers such a current density of 10 mA cm −2 at a low overpotential of 302 mV, which is much smaller than those of NiCo‐HS (399 mV), Co‐HS@G (376 mV), Ni‐HS@G (394 mV), and commercial benchmark IrO 2 catalyst (319 mV, Figure S12, Supporting Information). Moreover, NiCo‐HS@G could deliver the current density of 50 and 100 mA cm −2 at a lower overpotential of 347 and 373 mV, respectively, comparable to those achieved by the most active powder catalysts reported recently (Table S1, Supporting Information) . LSV curves without iR‐compensation were also recorded as shown in Figure S13 (Supporting Information) and exhibit the same trend of catalytic activity.…”

“…Over the last few years, various transition metal based catalysts have been intensively investigated as OER catalysts, such as metal hydr(oxy)oxides, oxides, and chalcogenides, because of their large elemental abundance and low cost. Among them, metal hydroxides received quite a lot attention due to the low cost, easy preparation, as well as eco‐friendly synthesis compared with metal chalcogenides and phosphides, but suffered from poor conductivity which limited their OER activity and the practical utilization at large output.…”

Ni(OH)2 Nanoflakes Supported on 3D Ni3Se2 Nanowire Array as Highly Efficient Electrodes for Asymmetric Supercapacitor and Ni/MH Battery

“…The binding energies of 853.5 eV for Ni 2p 3/2 and 871 eV for Ni 2p 1/2 are spin-orbit doublets of Ni 2+ , while the binding energies of 859.4 eV for Ni 2p 3/2 and 878.1 eV for Ni 2p 1/2 are shakeup satellites of Ni 2+ , proving the existence of Ni 2+ in Ni 3 Se 2 . [31] For the Se 3d spectrum (Figure 3d), the binding energies at 56.1 and 57 eV can be assigned to Se 3d 5/2 and Se 3d 3/2 , respectively, suggesting −2 valence of Se. [24] O 1s ( Figure S3b after deconvolution, which can be attributed to Ni-O-H and Ni-O-Ni.…”

Rechargeable Zn-air batteries initiated by nickel–cobalt bimetallic selenide

“…However, the poor conductivity of NiCo 2 O 4 limits the electrocatalytic properties to a certain extent. Transition metal selenides (M x Se, M = Co, Ni and Fe) exhibit better electrocatalytic performance owing to their metal conductive features when compared with the oxides and sulfides [24][25][26][27][28] http://engine.scichina.com/doi/10.1016/j.jechem.2019.01.001 active sites exposed by electrocatalysts is important; this is adequately achieved by the porous structure [29][30][31] .…”