Coal derived carbon nanomaterials – Recent advances in synthesis and applications

Hoang, Van Chinh; Hassan, Mahbub; Gomes, Vincent G.

doi:10.1016/j.apmt.2018.06.007

Cited by 126 publications

(51 citation statements)

References 107 publications

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“…In the NiO nanoparticles, four Raman scattering peaks were observable at 510, 742, 1085, and 1490 cm −1 , and those could be ascribed to the first-order longitudinal optical (LO 1 ) phonon mode of the Ni-O lattice vibration, the second-order transverse (TO 2 ), the second-order longitudinal optical (LO 2 ) phonon modes [ 39 , 57 ], and the two-magnon (2 M) mode of the NiO [ 31 ], respectively. Different from the NiO nanoparticles, the AC-NiO nanotablets revealed three additional Raman peaks at 1360, 1586, and 2856 cm −1 , attributing to D, G, and 2D bands of AC nanosponges [ 58 , 59 ] (see also Figure S3 ). From the Raman intensity ratio between D and G peaks (I D /I G = 0.99), one may also confirm that our biomass-AC was well graphitized [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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

Lee

Kim

2020

Nanomaterials

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“…So coal is a good carbon precursor material. 21,22 Some by-products in coal coking industry are studied generally, 23,24 but coal is seldom reported. However, the performance of pure coal is poor when used in the devices of energy conversion and storage.…”

Section: Introductionmentioning

confidence: 99%

KOH activation of coal-derived microporous carbons for oxygen reduction and supercapacitors

Guo

et al. 2020

RSC Adv.

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“…Coal is consist of angstrom-sized or nanometer-sized crystalline carbon linked by amorphous carbon and polymerized aromatic hydrocarbon (Thiyagarajan et al, 2016). These crystalline carbon domains are abundant in coal and the size of them meet requirements of CQDs (Dong et al, 2014;Hoang et al, 2018). Additionally, the cheapest price and substantial deposits of coal, in contrast to crystalline carbon such as graphene, carbon tubes and fullerenes, have attracted tremendous interest and efforts in developing preparation methods of CQDs from coal.…”

Section: Introductionmentioning

confidence: 99%

Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties

et al. 2020

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Low-cost and earth-abundant coal has been considered to have a unique structural superiority as carbon sources of carbon quantum dots (CQDs). However, it is still difficult to obtain CQDs from raw coal due to its compactibility and lower reactivity, and the majority of the current coal-based CQDs usually emit green or blue fluorescence. Herein, a facile two-step oxidation approach (K 2 FeO 4 pre-oxidation and H 2 O 2 oxidation) was proposed to fabricate bandgap tunable CQDs from anthracite. The K 2 FeO 4 pre-oxidation can not only weaken the non-bonding forces among coal molecules which cause the expansion of coal particles, but also form a large number of active sites on the surface of coal particles. The above effects make the bandgap tunable CQDs (blue, green, or yellow fluorescence) can be quickly obtained from anthracite within 1 h in the following H 2 O 2 oxidation by simply adjusting the concentration of H 2 O 2 . All the as-prepared CQDs contain more than 30 at% oxygen, and the average diameters of which are <10 nm. The results also indicate that the high oxygen content only can create new energy states inside the band gap of CQDs with average diameter more than 3.2 ± 0.9 nm, which make the as-prepared CQDs emit green or yellow fluorescence.

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Coal derived carbon nanomaterials – Recent advances in synthesis and applications

Cited by 126 publications

References 107 publications

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

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

KOH activation of coal-derived microporous carbons for oxygen reduction and supercapacitors

Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties

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