Influence of selected coal contaminants on graphitic carbon electro-oxidation for application to the direct carbon fuel cell

Tulloch, John; Allen, J. A.; Wibberley, L. J.; Donne, Scott W.

doi:10.1016/j.jpowsour.2014.03.026

Cited by 36 publications

(46 citation statements)

References 32 publications

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“…A commonly used technique for measuring the redox characteristics of carbons is solid-state cyclic voltammetry (SSCV) [24]. In this technique, a composite electrode consisting of 10% biochar and 90% SFG6 graphite (Timcal) was prepared through light grinding in a mortar and pestle.…”

Section: Measurement Of the Electrochemical Properties Of Fresh Biochmentioning

confidence: 99%

“…Nakamura et al [37] and [24] reported that the increase in current would indicate that oxidation of the C to CO2 takes place preferentially at the nanophase mineral/C interfaces and areas where high concentrations of oxygen functional groups exist [38]. Tulloch et al [24] using cyclic voltammetry has shown that anatase, pyrite, kaolin montmorillinite and alumina increased the rate of oxidation of C in coal. Corrosion experiments carried out on graphite and amorphous C indicate that oxidation of amorphous C surfaces results in an increase in pore surface area [38].…”

Section: Electrochemical Properties Of Biochar As Measured Using Solimentioning

confidence: 99%

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The Electrochemical Properties of Biochars and How They Affect Soil Redox Properties and Processes

et al. 2015

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Biochars are complex heterogeneous materials that consist of mineral phases, amorphous C, graphitic C, and labile organic molecules, many of which can be either electron donors or acceptors when placed in soil. Biochar is a reductant, but its electrical OPEN ACCESSAgronomy 2015, 5 323 and electrochemical properties are a function of both the temperature of production and the concentration and composition of the various redox active mineral and organic phases present. When biochars are added to soils, they interact with plant roots and root hairs, micro-organisms, soil organic matter, proteins and the nutrient-rich water to form complex organo-mineral-biochar complexes Redox reactions can play an important role in the development of these complexes, and can also result in significant changes in the original C matrix. This paper reviews the redox processes that take place in soil and how they may be affected by the addition of biochar. It reviews the available literature on the redox properties of different biochars. It also reviews how biochar redox properties have been measured and presents new methods and data for determining redox properties of fresh biochars and for biochar/soil systems.

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Section: Measurement Of the Electrochemical Properties Of Fresh Biochmentioning

confidence: 99%

Section: Electrochemical Properties Of Biochar As Measured Using Solimentioning

confidence: 99%

The Electrochemical Properties of Biochars and How They Affect Soil Redox Properties and Processes

et al. 2015

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“…All electrodes were held above the carbonate eutectic until it became molten, at which point they were submerged and allowed to equilibrate for 30 minutes. The graphitic reference system, hereafter referred to as the C/CO 2 /CO 3 2− system, has previously been shown to provide a reliable reference potential for electrochemical studies in molten carbonate salts . As such the system was judged to be sufficiently stable for use during the carbon electrodeposition process utilized here.…”

Section: Methodsmentioning

confidence: 99%

Optimized Electrolytic Carbon and Electrolyte Systems for Electrochemical Capacitors

2020

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Electrochemical reduction of a molten Li2CO3−Na2CO3−K2CO3 eutectic is used to produce highly amorphous carbon with considerable oxygen functionalization in a process focusing on the conversion of CO2 to value‐added carbon. Electrochemical characterization of materials using multiple techniques in different electrolytes allowed for the optimization of these materials as electrochemical capacitor electrodes. Variation in capacitive performance of the investigated materials has been provided based on their physical characteristics. The synthesized carbons are hybrid materials, showing both pseudocapacitive and electric double layer contributions to the total performance. Annealing under nitrogen at 800 °C is shown to widen pores in the carbon material, resulting in an increase in medium scan rate (5–10 mV.s−1) capacitance. A stable specific capacitance of 425 F.g−1 is obtained at 5 mV s−1 in 0.5 M Na2SO4 after 1000 cycles.

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“…The presence of clay and mineral components, kaolin, montmorillonite and alumina, in the ash fraction of coal have been shown to promote MCFC-type DCFC performance when combined with graphite [21]. The removal of these catalytic mineral components, including Fe [9], such as through demineralization [10], may result in decreased performance, as observed for the HDCFC performances of demineralized anthracite (AIII-MD and AIII-C, Table 2 and [28]).…”

Section: Coalsmentioning

confidence: 99%

“…2(a)). However, MCFC-type DCFC 3-electrode setups (Table 1) have been employed to identify the redox couples of other additives, including SiO 2 [21], CeO 2 [18], and various sulphur-containing compounds (e.g., K 2 S) [20], through the identification of CV peaks.…”

Section: Cyclic Voltammetrymentioning

confidence: 99%

Hybrid direct carbon fuel cell anode processes investigated using a 3-electrode half-cell setup

Deleebeeck

Arenillas

Menéndez

2015

International Journal of Hydrogen Energy

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Cyclic voltammetry (CV) Bituminous coal Carbon monoxide Carbon dioxide a b s t r a c t A 3-electrode half-cell setup consisting of a yttria-stabilized zirconia (YSZ) electrolyte support was employed to investigate the chemical and electrochemical processes occurring in the vicinity of a model hybrid direct carbon fuel cell (HDCFC) anode (Ni-YSZ) in contact with a molten carbon-alkali carbonate slurry. Electrochemical testing, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), with and without the Ni-YSZ layer highlighted the promotional effect of the Ni-YSZ anode layer, and revealed the contributions of Ni/NiO, and potentially K/K 2 O, redox couple(s). Treated anthracite and bituminous coals, as well as carbon black, were tested, revealing similar open circuit potential and activation energies in mixed 96e4 vol% N 2 eCO 2 and 50e50 vol% COeCO 2 environments between 700 and 800 C. Bituminous coal showed the highest activity, likely associated to a high O/C ratio and hydrogen content. Based on acquired data, a reaction scheme was proposed for processes at the working electrode, including the role of bubble formation in the vicinity of the electrochemically active solid/molten medium interface.

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Influence of selected coal contaminants on graphitic carbon electro-oxidation for application to the direct carbon fuel cell

Cited by 36 publications

References 32 publications

The Electrochemical Properties of Biochars and How They Affect Soil Redox Properties and Processes

The Electrochemical Properties of Biochars and How They Affect Soil Redox Properties and Processes

Optimized Electrolytic Carbon and Electrolyte Systems for Electrochemical Capacitors

Hybrid direct carbon fuel cell anode processes investigated using a 3-electrode half-cell setup

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