Nano‐Micro‐Structured Nickel‐Cobalt Hydroxide/Ni₂P₂O₇ Assembly on Nickel Foam: An Outstanding Electrocatalyst for Alkaline Oxygen Evolution Reaction

Abstract

The design and development of materials for the efficient electrochemical evolution of oxygen from hydroxyl ions in alkaline media is of prime importance for reducing energy losses in water‐alkaline electrolytes. In this Communication, we report non‐noble nano‐micro‐structured Ni2P2O7 microsheets decorated with nickel‐cobalt hydroxide (Ni−Co‐hydroxide) nanoflakes for the efficient oxygen evolution reaction (OER). Remarkably, the nano‐micro‐assembled Ni−Co‐hydroxide/Ni2P2O7 structured electrode exhibits superior catalytic activity towards the OER with a relatively low overpotential of 197 mV at a current density of 10 mA/cm2 in 1.0 M KOH, coupled with excellent long‐term stability (12 h). The outstanding OER activity resulted from the nano‐micro structure of the prepared electrode with excellent redox activity in an alkaline electrolyte.

NiCo-Based Electrocatalysts for the Alkaline Oxygen Evolution Reaction: A Review

“…The construction of NiCo-based multicomponent composites contributes to the improvement of OER performance because the interface of different components can provide more active sites and facilitate electron transfer. , Guo et al synthesized NiCo LDH@NiCo-hydroxysulfide (NiCo-LDH@HOS) nanosheet arrays through a facile surface sulfurization strategy . The NiCo-hydroxysulfide layer significantly increases the electrical conductivity, reactivity, and antierosion ability in alkaline media.…”

Ultrafast synthesis of NiFe electrocatalysts via a Fenton-assisted corrosion strategy for alkaline water and urea oxidation

“…19 Despite the slight decrease in the natural seawater electrolyte, its performance is still superior to that of many previously reported transition metal-based OER catalysts (Fig. 2d), [24][25][26][27][28][29][30][31] and it only needed overpotentials of 265 mV and 308 mV to yield 10 mA cm À2 and 100 mA cm À2 , respectively. In addition, the evaluation of electrochemical stability was carried out to analyze the overall performance of the F-NiFe LDH-NF catalyst.…”

Hierarchically porous Ni foam-supported Co and Sn doped Ni3S2nanosheets for oxygen evolution reaction electrocatalysts

“…4d). 22,28,[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59] The HER catalysis of the Ni 3 S 2 @NF, Co-Ni 3 S 2 @NF, and CoSn-Ni 3 S 2 @NF catalysts was also evaluated together with commercial Pt/C in O 2 -saturated 1.0 M KOH electrolyte using a typical three-electrode system. As shown in the polarization curve and Tafel plots of Fig.…”