Ultrafast Formation of Amorphous Bimetallic Hydroxide Films on 3D Conductive Sulfide Nanoarrays for Large‐Current‐Density Oxygen Evolution Electrocatalysis

Abstract

Developing nonprecious oxygen evolution electrocatalysts that can work well at large current densities is of primary importance in a viable water-splitting technology. Herein, a facile ultrafast (5 s) synthetic approach is reported that produces a novel, efficient, non-noble metal oxygen-evolution nano-electrocatalyst that is composed of amorphous Ni-Fe bimetallic hydroxide film-coated, nickel foam (NF)-supported, Ni S nanosheet arrays. The composite nanomaterial (denoted as Ni-Fe-OH@Ni S /NF) shows highly efficient electrocatalytic activity toward oxygen evolution reaction (OER) at large current densities, even in the order of 1000 mA cm . Ni-Fe-OH@Ni S /NF also gives an excellent catalytic stability toward OER both in 1 m KOH solution and in 30 wt% KOH solution. Further experimental results indicate that the effective integration of high catalytic reactivity, high structural stability, and high electronic conductivity into a single material system makes Ni-Fe-OH@Ni S /NF a remarkable catalytic ability for OER at large current densities.

Utilizing the Space‐Charge Region of the FeNi‐LDH/CoP p‐n Junction to Promote Performance in Oxygen Evolution Electrocatalysis

“…Thea bove OER performances are summarized in the Supporting Information, Table S2, indicating our work comes up to,e ven exceeds,t he corresponding performances of the reported OER catalysts.Their mole activity normalized to active metal ions and corresponding turnover frequency (TOF) at different overpotentials can be evaluated directly related to the intrinsic activities of catalytic sites.Asshown in the Supporting Information, Figure S6 Table S3). [48] As displayed in Figure 5d,T he FeNi-LDH/CoP/CC anode exhibits excellent durability with maintaining the high OER activity for about 18.5 hw ithout degradation, indicating the junction has the long-term robustness that can be attributed to the binder-free design and the strong interaction of the interface. [48] As displayed in Figure 5d,T he FeNi-LDH/CoP/CC anode exhibits excellent durability with maintaining the high OER activity for about 18.5 hw ithout degradation, indicating the junction has the long-term robustness that can be attributed to the binder-free design and the strong interaction of the interface.…”

Oxygen Vacancies Dominated NiS2/CoS2 Interface Porous Nanowires for Portable Zn–Air Batteries Driven Water Splitting Devices

“…[12][13][14] However, their low abundance and high cost limit their large-scale applications in energy conversion and storage devices. [21][22][23][24][25] One of promising material systems is transition metal sulfides with controlled surface and interface tuning [26][27][28][29][30] such as high-index faceted sulfides, [28] metallic sulfides, [29] and interface sulfides [30] for catalyzing OER. [21][22][23][24][25] One of promising material systems is transition metal sulfides with controlled surface and interface tuning [26][27][28][29][30] such as high-index faceted sulfides, [28] metallic sulfides, [29] and interface sulfides [30] for catalyzing OER.…”

Integrated Nanostructural Electrodes Based on Layered Double Hydroxides

“…Copyright 2015, John Wiley & Sons, Inc. SEM images of g) Ni 3 S 2 / NF and h) Ni 3 S 2 @NiFe‐ LDH . i) Schematic illustration of the enhanced OER activity with Ni 3 S 2 @NiFe‐ LDH . Copyright 2017, John Wiley & Sons, Inc. SEM images of j) Co@ CNT s nanoarrays with different magnifications, k) Co@ CNT s@CoNi‐ LDH nanoarrays with the mass‐loading of CoNi‐ LDH of 2 mg cm −2 .…”

“…The interaction between components in the hierarchical structure could be enhanced when the second phase is in situ formation on the matrix. Zou et al . reported a hierarchical core–shell structures with Ni 3 S 2 as core and NiFe‐LDH as shell (Ni 3 S 2 @NiFe‐LDH) via a facile ultrafast synthetic method (Figure g,h).…”