Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves: A sustainable bifunctional electrocatalyst for efficient water splitting

Hoang, Van Chinh; Dinh, Khang Ngoc; Gomes, Vincent G.

doi:10.1016/j.carbon.2019.09.080

Cited by 90 publications

(54 citation statements)

References 38 publications

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“…It is important to remember that both NiO and Ni(OH) 2 follow a similar redox reaction, which can be simplified with a single-electron reaction as: 40,41 Ni(OH) 2 + OH À 2 NiOOH + H 2 O + e À NiO + OH À 2 NiOOH + e À…”

Section: Resultsmentioning

confidence: 99%

High intrinsic activity of the oxygen evolution reaction in low-cost NiO nanowall electrocatalysts

et al. 2020

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Section: Resultsmentioning

confidence: 99%

High intrinsic activity of the oxygen evolution reaction in low-cost NiO nanowall electrocatalysts

et al. 2020

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“…Among the transition-metal-based OER and ORR catalysts, Ni-containing catalysts are promising candidates [7,[11][12][13]. The performance of the nickel catalysts could be further enhanced via modifications, such as the usage of carbon supports including N-doped graphene [14], active carbon [15], graphene oxide [16,17], carbon nanotubes [12,18] and covalent triazine frameworks (CTFs) [19,20].…”

Section: Introductionmentioning

confidence: 99%

Nickel nanoparticles supported on a covalent triazine framework as electrocatalyst for oxygen evolution reaction and oxygen reduction reactions

Öztürk

Xiao

Dietrich

et al. 2020

Beilstein J. Nanotechnol.

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Covalent triazine frameworks (CTFs) are little investigated, albeit they are promising candidates for electrocatalysis, especially for the oxygen evolution reaction (OER). In this work, nickel nanoparticles (from Ni(COD)2) were supported on CTF-1 materials, which were synthesized from 1,4-dicyanobenzene at 400 °C and 600 °C by the ionothermal method. CTF-1-600 and Ni/CTF-1-600 show high catalytic activity towards OER and a clear activity for the electrochemical oxygen reduction reaction (ORR). Ni/CTF-1-600 requires 374 mV overpotential in OER to reach 10 mA/cm2, which outperforms the benchmark RuO2 catalyst, which requires 403 mV under the same conditions. Ni/CTF-1-600 displays an OER catalytic activity comparable with many nickel-based electrocatalysts and is a potential candidate for OER. The same Ni/CTF-1-600 material shows a half-wave potential of 0.775 V for ORR, which is slightly lower than that of commercial Pt/C (0.890 V). Additionally, after accelerated durability tests of 2000 cycles, the material showed only a slight decrease in activity towards both OER and ORR, demonstrating its superior stability.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Lee

Kim

2020

Nanomaterials

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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.

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Hybrid Ni/NiO composite with N-doped activated carbon from waste cauliflower leaves: A sustainable bifunctional electrocatalyst for efficient water splitting

Cited by 90 publications

References 38 publications

High intrinsic activity of the oxygen evolution reaction in low-cost NiO nanowall electrocatalysts

High intrinsic activity of the oxygen evolution reaction in low-cost NiO nanowall electrocatalysts

Nickel nanoparticles supported on a covalent triazine framework as electrocatalyst for oxygen evolution reaction and oxygen reduction reactions

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

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