Hierarchical heterostructure NiCo₂O₄@CoMoO₄/NF as an efficient bifunctional electrocatalyst for overall water splitting

Abstract

The as-obtained NiCo2O4@CoMoO4/NF-7 electrode exhibits superior electrocatalytic performance and extraordinary durability for OER, HER, and overall water splitting.

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

“…Many transition‐metal oxides and hydroxides such as NiO, Ni(OH) 2 , and Ni−Co‐hydroxides have been successfully implemented, exhibiting noteworthy OER performance; however, poor electrical conductivity is an important issue that leads to degraded performance . Moreover, 3D structures such as metal of Ni−Co−S//Ni−Co−P nanowires arrays, NiCoSe 2 @NiO@CoNi 2 S 4 @CoS 2 hybrid structures and hierarchical heterostructures of NiCo 2 O 2 @CoMoO 4 nano‐fibers, Ni 3 S 2 nano‐sheets coated on Co 3 O 4 nano needle arrays has been found efficient as bifunctional and OER catalyst . Along with 3D structures and hierarchical structures many strategies have been implemented to enhance the conductivity as well as streamline the electrochemical reaction towards the OER rather than redox reactions, such as incorporation of a nanocatalyst into the host material to enhance the catalytic activity and stability, and combining a metal‐organic framework with a nanocatalyst .…”

“…[14][15][16][17] Moreover, 3D structures such as metal of NiÀ CoÀ S//NiÀ CoÀ P nanowires arrays, NiCoSe 2 @NiO@CoNi 2 S 4 @CoS 2 hybrid structures and hierarchical heterostructures of NiCo 2 O 2 @CoMoO 4 nano-fibers, Ni 3 S 2 nanosheets coated on Co 3 O 4 nano needle arrays has been found efficient as bifunctional and OER catalyst. [18][19][20][21] Along with 3D structures and hierarchical structures many strategies have been implemented to enhance the conductivity as well as streamline the electrochemical reaction towards the OER rather than redox reactions, such as incorporation of a nanocatalyst into the host material to enhance the catalytic activity and stability, and combining a metal-organic framework with a nanocatalyst. [22,23] However, the metal-organic incorporation strategy requires high-temperature annealing, which is not energy efficient.…”

Hierarchically Porous W‐Doped CoP Nanoflake Arrays as Highly Efficient and Stable Electrocatalyst for pH‐Universal Hydrogen Evolution

“…Despite many efforts have achieved, most of TMPs-based electrocatalysts are still in powder forms, thereby a complex electrode preparation process is involved and the undesired polymeric binders must be used. [40] Unfortunately, the polymeric binders can cover the active sites and are easily peeled off form the surface of electrodes in the long-time HER process, which greatly limits their practical application. To solve such problems, direct growth of well-aligned nanoarray architectures on conductive substrates, has been regarded as an efficient approach to design high-performance, stable, and binder-free electrocatalysts.…”

Synthesis of Graphite Oxide/Cobalt Molybdenum Oxide Hybrid Nanosheets for Enhanced Electrochemical Performance in Supercapacitors and the Oxygen Evolution Reaction

“…[10b] Core/ shell nanostructures of Co 3 O 4 @CoMoO 4 on Ni-foam were exhibited high specific capacitance at a current density of 1 A/ g. [11] To enhance the electrochemical performances of the supercapacitors, the composite electrodes could ensure high electrical conductivity, durability, and surface area by the incorporation of other substances. [14] Moreover, WO 3 /α-Fe 2 O 3 hetero-structures have shown potential applications in photoelectrochemical water oxidation reactions. CoMoO 4 nanostructured materials have been reported as efficient electrocatalysts for OER.…”

“…[13] NiCo 2 O 4 @CoMoO 4 /NF hetero-structured materials are reported as bi-functional electrocatalyst in water splitting reactions for OER and HER. [14] Moreover, WO 3 /α-Fe 2 O 3 hetero-structures have shown potential applications in photoelectrochemical water oxidation reactions. [15] MW Kanan et al have developed cobalt based phosphates electrocatalysts for water oxidation reactions.…”