Ni/NiO@rGO as an efficient bifunctional electrocatalyst for enhanced overall water splitting reactions

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.…”

“…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.…”

Graphene-based materials as electrocatalysts for the oxygen evolution reaction: a review

“…Narwade et al prepared nickel/nickel oxide on reduced graphene oxide (Ni/NiO@rGO) using a chemical synthesis method. 56 The composite was used as an electrocatalyst for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). For the HER, the composite displayed an overpotential of 582 mV vs. RHE at 10 mA cm −2 and Tafel slope of 63 mV dec −1 in 0.5 M H 2 SO 4 .…”

Palladinized graphene oxide-MOF induced coupling of Volmer and Heyrovsky mechanisms, for the amplification of the electrocatalytic efficiency of hydrogen evolution reaction

“…Accordingly, a replacement of these platinum-based materials is paramount important 10 – 14 . Non-noble catalysts have been shown as alternative materials because of their exceptional electrical conductivity and outstanding durability 12 – 14 , yet, their limited active sites limit their HER performance 6 , 15 .…”

“…They showed that Rh–GO composite possessed an improved electrochemical performance for water splitting reactions with a small overpotential of 2 mV for the HER at a current density of 10 mA cm −2 and Tafel slope of 10 mV dec –1 . The nickel/nickel oxide on reduced graphene oxide (Ni/NiO@rGO) composite demonstrated to have an overpotential of 582 mV at a current density at 10 mA cm −2 with a Tafel slope of 63 mV dec −1 obtained in 0.5 M H 2 SO 4 towards HER 12 . The establishment of GO/MOF composite was demonstrated by Petit and Bandosz 25 , 26 which was formed through connections between metallic cores of MOF and oxygen groups of GO.…”