Structural and electrochemical properties of babassu coconut mesocarp-generated activated carbon and few-layer graphene

Ghosh, Anupama; Razzino, Claudia A.; Dasgupta, Archi; Fujisawa, Kazunori; Vieira, Laís Helena Sousa; Subramanian, S.; Costa, Rubens Silva; Lobo, Anderson Oliveira; Ferreira, Odair P.; Terrones, Mauricio; Terrones, Humberto; Viana, Bartolomeu C.

doi:10.1016/j.carbon.2018.12.114

Cited by 68 publications

(30 citation statements)

References 55 publications

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“…Particularly, the (002) and (100) peak of HBFC-1 and HBFC-2 shifts to lower angle as compared with HBFC-3 and HBFC-4 samples, suggesting the larger interlayer distance of HBFC-1, HBFC-2 samples due to the much thinner carbon nanosheets. 42 Moreover, the (002) diffraction peaks can be distinguished in HBFC-1, due to the strong etching effect on the lamellar crystal structure by activation. This suggests that a disturbed structure in amorphous carbons is caused due to the randomly oriented hexagonal carbon layers, which is beneficial for increasing the specific surface area.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of porous carbon material based on biomass derived from hibiscus sabdariffa fruits as active electrodes for high-performance symmetric supercapacitors

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Synthesis of porous carbon material based on biomass derived from hibiscus sabdariffa fruits as active electrodes for high-performance symmetric supercapacitors

et al. 2021

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“…Supercapacitors play an important role in electrochemical energy storage device due to their high energy density, longevity, and good stability [1][2][3]. They can be divided on the basis of energy storage principle into the electric double-layered capacitors (EDLCs) and pseudocapacitors [4].…”

Section: Introductionmentioning

confidence: 99%

Preparation of an O/N/P/S co-doped hierarchical porous carbon material derived from snake skin for supercapacitors

Shao

Wang

Guo

et al. 2020

J Mater Sci: Mater Electron

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An O/N/P/S co-doped carbon material with hierarchical porous structure for supercapacitors is prepared from snake skin by a simple calcination method, which exploits its own scaffold silica (SiO 2 ) as the self-sacrifice template combining with the activated agent potassium hydroxide (KOH). The KOH acts not only as activator to create micropores, but also as etching agent to remove the nonconductive SiO 2 in situ, leading to better conductivity, as well as forming mesopores and macropores. The influences of calcination temperature and SiO 2 etching on the electrochemical performances are discussed. Under the synergistic effects of the hierarchical pores in its structure and the existing of multiple hetero atoms, as well as the removal of SiO 2 , the obtained carbon material (C-KOH) displays outstanding specific capacitance (717.6 F g − 1 at 1 A g − 1 ) and excellent stability (120% capacitance retention rate after 40,000 cycles).

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“…Gr nanosheets were grown vertically on the Ta current collector to form a 3D mesh structure with multilevel pores, which provide this working electrode with an electroactive area ( A eff = 10.36 cm 2 ), which is 10.36 times larger than its geometric area (1 cm 2 ) (Figure S3). The electroactive area ( A eff ) was calculated using the Randles–Sevcik equation I P = 2.69 × 10 5 n 3/2 A eff D 1/2 ν 1/2 c , where n is the number of transferred electrons (here, n = 1), D is the diffusion coefficient (7.6 × 10 –6 cm 2 s –1 ), and c is the initial concentration of the redox probe. Specifically, A eff was calculated by substituting n , D , c , and the slope of the I p – v 1/2 curve (Figure S3c) into the Randles–Sevcik equation.…”

Section: Resultsmentioning

confidence: 99%

In Situ Detection of Melatonin and Pyridoxine in Plants Using a CuO–Poly(l-lysine)/Graphene-Based Electrochemical Sensor

Liu

et al. 2019

ACS Sustainable Chem. Eng.

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Plants operate under a wide range of pH conditions, which makes it difficult to achieve breakthroughs when developing sensors for the in vivo monitoring of bioactive molecules in plants. Herein, we report a highly sensitive and long-life plant sensor for the in situ detection of melatonin (MT) and vitamin B 6 (pyridoxine, PN) in plants. A CuO−poly(L-lysine)/graphene-sensing electrode is the core component of the electrochemical sensor, in which CuO and poly(L-lysine) are mainly responsible for identifying MT and PN, and the three-dimensional (3D) graphene layer amplifies the catalytic current to improve sensitivity. According to differential pulse voltammetry (DPV), the oxidation potential of MT ranges from −0.1 to 0.5 V, while the optimum oxidation potential of PN is about 0.6 V. To adapt to the large differences in plant pH values, a series of linear regression equations were established in the pH range 5.8−7.4, which is convenient for the in situ detection of analytes in plants and their direct detection in puree. Current−time curves reveal a linear concentration range of 0.016−1110 μM for MT, with an average sensitivity of 0.076 μA μM −1 cm −2 , while the linear concentration range for PN is 3−2076 μM, with an average sensitivity of 0.230 μA μM −1 cm −2 (pH 6.8−7.4). The plant sensor is suitable for the in situ determination of MT and PN levels in various fruits; hence, it has important applied value for monitoring growth processes in plants and analyzing components in agricultural products. In addition, this detection strategy can be used to establish the detection modes of other sensors.

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Structural and electrochemical properties of babassu coconut mesocarp-generated activated carbon and few-layer graphene

Cited by 68 publications

References 55 publications

Synthesis of porous carbon material based on biomass derived from hibiscus sabdariffa fruits as active electrodes for high-performance symmetric supercapacitors

Synthesis of porous carbon material based on biomass derived from hibiscus sabdariffa fruits as active electrodes for high-performance symmetric supercapacitors

Preparation of an O/N/P/S co-doped hierarchical porous carbon material derived from snake skin for supercapacitors

In Situ Detection of Melatonin and Pyridoxine in Plants Using a CuO–Poly(l-lysine)/Graphene-Based Electrochemical Sensor

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