Nitrogen-doped carbon based on peptides of hair as electrode materials for surpercapacitors

Yue

Desalination and Water Treatment

2016

A B S T R A C TFour activated carbons (ACs) were prepared from four different solid wastes (SWs), including Enteromorpha prolifera, Kraft lignin, hair, and petroleum coke, using KOH as the activating agent. The fabricated ACs were characterized by N 2 adsorption, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier transformed infrared and X-ray photoelectron spectroscopy to compare their pore structures and surface chemical properties of the ACs. It was found that ACs produced from E. prolifera and Kraft lignin were rich in mesopores, whereas petroleum coke and hair were inclined to produce ACs with more micropores. Meanwhile, ACs derived from E. prolifera possessed the largest surface area of 3,471 m 2 g −1 and pore volume of 2.681 cm 3 g −1 . In addition, ACs prepared from various SWs displayed different chemical nature. Adsorption behavior of hexavalent chromium on the four fabricated ACs was studied as well, and the adsorption data were all well fitted by Freundlich equation, indicating the similar multilayer adsorption behavior of hexavalent chromium on the heterogeneous surface of the ACs.

Section: Morphology Analysissupporting

confidence: 92%

Comparison on physical, chemical, and adsorption properties of activated carbon derived from different solid wastes

Yue

Desalination and Water Treatment

2016

“…Another protocol to improve the electrochemical performance of electrodes is the incorporation of nitrogen‐containing functional groups, which can induce pseudo‐capacitance and also improve the electrical conductivity. In the past, the traditional ways to make nitrogen‐doping carbon materials is dangerous and time‐consuming . For example, nitrogen‐doped ACs have been synthesized by carbonization of nitrogen‐enriched precursors or treatment with ammonia gas.…”

Section: Introductionmentioning

confidence: 84%

N‐doping Hierarchical Porosity Carbon from Biowaste for High‐Rate Supercapacitive Application

Zhao

Zhang

et al. 2017

ChemistrySelect

In this work, nitrogen‐doped carbon materials with hierarchical porosity were prepared from biowaste of soybean curd residue (SCR) by KOH activation. The morphology, structure and textural properties of the carbon materials are investigated by scanning electron microscopy, transmission electron microscopy, X‐ray photoelectron spectroscopy, X‐ray diffraction, Raman spectroscopy, and N2 absorption‐desorption isotherms, respectively. The products exhibit high specific surface area of 3431 m2 g−1, high nitrogen doping level, outstanding charge storage capacity of 282 F g−1 at the current density of 0.5 A g−1 and good electrochemical stability over 10000 cycles. Moreover, it still retains 200 F g−1 (71 % of its capacitance at 0.5 A g−1) at 20 A g−1. The findings pave the way for improving charge storage capacity of supercapacitors based on activated carbon and provide a new method to transfer biowaste to effective electrode material.

International Journal of Photoenergy

“…Moreover, two XRD peaks were observed at 25.5°and 42.3°. These peaks can be assigned to (002) and (101) planes, respectively [20,30]. The presence of clear (002) and (101) peaks suggests that the carbonized hair already partially transforms into some turbostratic graphitic structure [30].…”

Section: Resultsmentioning

confidence: 99%

“…Yet, there were only a few reports involving applications of carbonized human hair as an electrochemical electrode. These reports demonstrated the use of carbonized hair as a supercapacitor electrode [19,20] and as a CE of a quantum dot-sensitized solar cells (QDSSC) [13]. As for the QDSSC-related work, Sahasrabudhe et al fabricated their QDSSC CEs by mixing carbonized-hair powder with a PVDF binder and an NMP solvent.…”

Section: Introductionmentioning

confidence: 99%

A Dye-Sensitized Solar Cell Using a Composite of PEDOT:PSS and Carbon Derived from Human Hair for a Counter Electrode

Moolsarn

Tangtrakarn

Pimsawat

et al. 2017

Carbon derived from hair is interesting because it has good electrocatalytic activity due to the existence of innate heteroatom dopants especially nitrogen and sulfur. In this study, a carbon catalyst containing high nitrogen contents (9.47 at.%) was fabricated without using any harsh chemicals. Moreover, the carbonization temperature was only 700°C. Carbonized hair/ PEDOT:PSS composites (C x P) with varied carbon contents from x = 0.2 to 0.8 g were tested as a counter electrode (CE) for a dye-sensitized solar cell (DSSC). This type of DSSC CE has scarcely been investigated. A DSSC with a C 0.6 P CE provides the best efficiency (6.54 ± 0.11%) among all composite CEs because it has a high fill factor (FF) and a high short-circuit current density (J sc ). The efficiency of DSSC with C 0.6 P CE is lower than Pt's (7.29 ± 0.01%) since the Pt-based DSSC has higher FF and J sc values. However, C 0.6 P is still promising as a DSSC CE since it is more cost-effective than Pt.