A quadrafunctional electrocatalyst of nickel/nickel oxide embedded N-graphene for oxygen reduction, oxygen evolution, hydrogen evolution and hydrogen peroxide oxidation reactions

Abstract

A multifunctional nano-heterostructured electrocatalyst of transition metal/metal oxide (nickel/nickel oxide) embedded on nitrogen-doped graphene is reported.

Trimetallic Mn‐Fe‐Ni Oxide Nanoparticles Supported on Multi‐Walled Carbon Nanotubes as High‐Performance Bifunctional ORR/OER Electrocatalyst in Alkaline Media

“…Their properties can be further modified, e.g., through heteroatom functionalization, or by engineering of defects as potential anchoring sites for active nanoparticles . Thus, a wide variety of MO X /C‐type materials has been proposed as catalysts for OER, ORR, and for reversible ORR/OER . Materials used for the latter are commonly known as bifunctional oxygen electrodes (BOEs), finding application in electrochemical devices which require the reversible conversion of water into oxygen and vice versa, such as rechargeable metal–air batteries and reversible fuel cells …”

Excellent Oxygen Evolution Reaction of Activated Carbon-Anchored NiO Nanotablets Prepared by Green Routes

“…However, the electrocatalytic OER performances of the NiO nanostructures are still unsatisfiable because of their sluggish kinetics, low electronic conductivity, and limited active sites [ 32 , 33 ]. To release such drawbacks, thus, anchoring of NiO with carbonaceous materials (e.g., carbon particles [ 32 ], carbon nanotubes [ 33 , 34 ], carbon fibers [ 35 ], carbon nanowires [ 36 ], activated carbon (AC) [ 37 ], graphene [ 38 , 39 , 40 ], reduced graphene oxide [ 41 , 42 ], etc.) has been proposed as an effective way to improve the electrical conductivity as well as the vigorous kinetic reaction.…”

“…For instance, Hoang et al [ 37 ] synthesized Ni/NiO/N-doped AC by using cauliflower leaves, and they showed a low overpotential of 346 mV at 10 mA/cm 2 and a small Tafel slope of 70 mV/dec. Faisal et al [ 40 ] also reported a low overpotential of 410 mV at 10 mA/cm 2 when using the Ni/NiO/N-graphene composites as an OER electrocatalyst. Very recently, Mugheri et al [ 32 ] achieved a very low overpotential of 220 mV and a small Tafel slope of 55 mV/dec from NiO/C electrocatalysts.…”

“…Furthermore, due to its environmental friendliness, vast abundance, fast regeneration, and low cost, biomass-derived AC has attracted extensive attention from the next-generation energy technology community [ 43 , 44 , 45 , 46 , 47 ]. However, most of all previous works have still used some chemical solutions (e.g., solvents and/or acids) for the formation of both electrocatalysts and carbonaceous materials [ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ]. Therefore, developing an ecofriendly and chemical-free synthesis method is essential to realize the fully green energy technology.…”

Boron-doped graphene-supported manganese oxide nanotubes as an efficient non-metal catalyst for the oxygen reduction reaction

“…Graphene nanosheets (GNS), a two-dimensional material with sp 2 hybridized network of carbon atoms, is a novel support material due to its excellent physical and chemical properties such as high carrier mobility, excellent electrical conductivity, high chemical stability, high surface area and strong interfacial adhesion with electrocatalytic materials. GNS are almost transparent and has great potential in many applications such as solar cell 12 , sensors 13 , energy storage applications 14 and ORR 15 .…”