A high performance direct carbon solid oxide fuel cell – A green pathway for brown coal utilization

Wu, Hao; Xiao, Jie; Zeng, Xiaoyuan; Li, Xue; Yang, Jing; Zou, Yuling; Liu, Sudongfang; Dong, Peng; Zhang, Yingjie; Liu, Jiang

doi:10.1016/j.apenergy.2019.04.104

Cited by 81 publications

(25 citation statements)

References 40 publications

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“…5,21,24 The fact that a higher oxygen content of carbon would yield a higher OCP is widely accepted and might be the principal reason for the high OCP of the BP-fed cell in this study. 5,6,17,26 BP is a kind of biomass, and this explains the high oxygen content of carbon therein, being composed of many oxygenrich (hydroxyl, carbonyl, and carboxyl) groups. Additionally, as the operating temperature increased to 450 °C, the fluidity of the hydroxide ions was enhanced, rendering the transport of hydroxide ions to the carbon fuel considerably easier, while the OCP of the BP-fed cell was further increased.…”

Section: Resultsmentioning

confidence: 99%

“…The other EIS profiles imply a combination behavior of Ohmic-controlled and mass-transfer-controlled polarization. To investigate the detailed information of these EIS profiles, a simulation of the equivalent circuit of the cell was applied to the EIS data using modified Randle cell models composed of R 1 , R 2 , Q (constant phase element), and W . , The best fitting model was a modified Randel cell model, as depicted in Figure . The simulation results of this model are revealed in Table .…”

Section: Resultsmentioning

confidence: 99%

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Feasibility of Pine Bark Pellets and Their Pyrolyzed Biochar Pellets as Fuel Sources in Molten Hydroxide Direct Carbon Fuel Cells

Luo

et al. 2020

Energy Fuels

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A comprehensive study was conducted on the fuel feasibility of forest-based biomass−pine bark pellets (BPs) and their pyrolyzed biochar pellets (BP800) using molten hydroxide direct carbon fuel cells (MH-DCFCs). The polarization behaviors of MH-DCFCs fed with BP and BP800 were Ohmic resistance-controlled in the low current density region, while mass-transfercontrolled polarization behavior was dominant in the high current density region. The achieved maximum current density and peak power density were 74.5 mA/cm 2 and 30.8 mW/cm 2 at 450 °C for BP and 110.4 mA/cm 2 and 45.0 mW/cm 2 at 450 °C for BP800, respectively. The fuel availability test revealed that the batch lives of BP-and BP800-fed cells are ∼19.0 and ∼15.7 h and the energy conversion efficiencies are 39.0 and 45.9%, respectively, indicating that the fuel performance of BP is comparable with that of the pyrolyzed biochar (BP800) thereof with regard to energy conversion efficiency and cell stability. The characterizations suggest that this can be largely attributed to the inherent ash components in BP and the water formation during the BP-fed cells' operation, which can suppress the carbonate ion accumulation at the anode. In conclusion, direct utilization of raw BP as the fuel is feasible to feed MH-DCFCs, and the thermal pretreatment might not be required for biomass to run MH-DCFCs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Feasibility of Pine Bark Pellets and Their Pyrolyzed Biochar Pellets as Fuel Sources in Molten Hydroxide Direct Carbon Fuel Cells

Luo

et al. 2020

Energy Fuels

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“…The preparation method of Ag-GDC slurry has been reported in the previous works. 2,22 The electrodes, including anode and cathode, were prepared by brushing method. 20,21 A high temperature adhesive tape was used to control the cathode area of 0.28 cm 2 .…”

Section: Preparing and Assembling Of Dc-sofcsmentioning

confidence: 99%

Direct carbon solid oxide fuel cells powered by rice husk biochar

Cai

Tong

Yan

et al. 2021

Intl J of Energy Research

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The inefficient application of fossil energy is one of the fundamental factors leading to global warming. Bioenergy is a renewable energy and also a carbonneutral energy, with advantages of extensive sources, diverse products, and environmental friendliness. Direct carbon solid oxide fuel cell (DC-SOFC) is a novel high-efficient bioenergy technology, which is able to directly convert the chemical energy of biochar into power. A biochar derived from rice husk is applied to power an electrolyte-supported DC-SOFC. The maximum power density of the cell with pure rice husk biochar is 135 mW cm À2 at 850 C, which enhances to 214 mW cm À2 after using a Boudouard reaction catalyst.The microstructures, components and thermochemical parameters of the biochar are characterized and analyzed. The results show that the microstructure of the rice husk biochar is rough and porous. Na, K, Mg, Al, and other elements are found to present in the biochar. The physicochemical properties of the biochar and the enhanced electrical output of the DC-SOFCs are demonstrated and discussed in detail. K E Y W O R D S biochar, Boudouard reaction, direct carbon fuel cell, Fe catalyst, rice husk 1 | INTRODUCTION Climate change characterized by global warming is one of the most significant environmental and development challenges that human society has faced since the Second World War. 1 On September 22, 2020, President Xi Jinping announced that China would strive to reach the peak of carbon dioxide emissions by 2030 and achieve carbon neutrality by 2060. This goal is challenging for China. The realization of carbon neutrality requires large-scale emission reductions in the energy, industry, construction and transportation sectors. Biomass energy is a special

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“…Compared with other fuel cells fed with gaseous fuel (such as H 2 , natural gas, CH 4 ), the exclusive characteristic of DC-SOFC is the solid fuel, which has a higher volumetric energy density. The solid fuel is convenient and safe to transport and can be obtained widely from coal [9][10][11][12][13][14][15] and biomass [3,16] (such as almond shells [17], wheat straw [18], corn cob char [19], pepper straw [20], and pomelo peel [21]). The concentration of solid fuel will not decrease due to the co-existence with gaseous products during the operation of the fuel cell, and thus the theoretical potential will not reduce.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Fluidized Bed Gasifier Coupled with Solid Oxide Fuel Cell Fed with Solid Carbon

et al. 2021

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A model of a fluidized bed coupled with direct carbon solid oxide fuel cell (SOFC) is developed to explore the effect of coupling between fluidized bed and solid oxide fuel cell. Three gas–solid flow regimes are involved including fixed bed, delayed bubbling bed and bubbling bed. The anode reaction of SOFC is treated as the coupling processes of Boudouard gasification of carbon and electrochemical oxidation of CO. The effects of inlet velocity of the fluidizing agent CO2, carbon activity, channel width and coupling extent on the system performance are investigated. The results show that the inlet velocity of CO2 can promote the gasification rate in the anode, but too high velocities may lower CO molar fraction. The gasification rate generally increases with the increase of the channel width and carbon activity. The overlapping area between the anode surface and the initial carbon bed, gas–solid regime and carbon activity have a significant influence on the gasification rate and the maximum current density the system can support. Overall, the mass transport in the anode is dramatically enhanced by the expansion of the carbon bed, back-mixing, solid mixing and gas mixing, especially for the delayed bubbling bed and bubbling bed. This indicates that the adopted coupling method is feasible to improve the anode performance of direct carbon solid oxide fuel cell.

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A high performance direct carbon solid oxide fuel cell – A green pathway for brown coal utilization

Cited by 81 publications

References 40 publications

Feasibility of Pine Bark Pellets and Their Pyrolyzed Biochar Pellets as Fuel Sources in Molten Hydroxide Direct Carbon Fuel Cells

Feasibility of Pine Bark Pellets and Their Pyrolyzed Biochar Pellets as Fuel Sources in Molten Hydroxide Direct Carbon Fuel Cells

Direct carbon solid oxide fuel cells powered by rice husk biochar

Numerical Simulation of Fluidized Bed Gasifier Coupled with Solid Oxide Fuel Cell Fed with Solid Carbon

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