Abstract
A sustainable and efficient electrocatalyst for the oxygen evolution reaction (OER) is vital to realize green and clean hydrogen production technology. Herein, we synthesized the nanocomposites of activated carbon-anchored nickel oxide (AC-NiO) via fully green routes, and characterized their excellent OER performances. The AC-NiO nanocomposites were prepared by the facile sonication method using sonochemically prepared NiO nanoparticles and biomass-derived AC nanosponges. The nanocomposites exhibited an aggregated structure of the AC-NiO nanotablets with an average size of 40 nm. When using the nanotablets as an OER catalyst in 1 M KOH, the sample displayed superb electrocatalytic performances, i.e., a substantially low value of overpotential (320 mV at 10 mA/cm2), a significantly small Tafel slope (49 mV/dec), and a good OER stability (4% decrease of overpotential after 10 h). These outstanding OER characteristics are considered as attributing to the synergetic effects from both the ample surface area of the electrochemically active NiO nanoparticles and the high electrical conductivity of the AC nanosponges. The results pronounce that the fully ecofriendly synthesized AC-NiO nanotablets can play a splendid role as high-performance electrocatalysts for future green energy technology.
Highlights
Due to both the anxiety of environmental complications and the scarcity of fossil fuels, renewable energy sources have been of vast interest to realize green energy technology [1,2,3]
We report on experimental data for obtaining high-performance we report on experimental for the synthesis of anchored nickel oxide (AC-nickel oxide (NiO))
The energy dispersive x-ray (EDX) spectrum confirmed that the AC-NiO nanocomposites obviously involved the C species (Figure 2f)
Summary
Due to both the anxiety of environmental complications and the scarcity of fossil fuels, renewable energy sources have been of vast interest to realize green energy technology [1,2,3]. Ir/Ru-based oxides are deemed to be a benchmark of the high-performance OER electrocatalysts because of their most active sites and high water-to-hydrogen conversion efficiency [7,8]. The electrocatalytic OER performances of the NiO nanostructures are still unsatisfiable because of their sluggish kinetics, low electronic conductivity, and limited active. 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, anchoring of NiO with carbonaceous materials
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