Justifying the significance of Knudsen diffusion in solid oxide fuel cells

Yang, Fei; Gu, Jianmin; Ye, Luhan; Zhang, Zuoxiang; Rao, Gaofeng; Liang, Yachun; Wen, Kechun; Zhao, Jiyun; Goodenough, John B; He, Weidong

doi:10.1016/j.energy.2015.12.022

Cited by 25 publications

(12 citation statements)

References 35 publications

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“…CO 2 molecules transferred into microalgal biofilm for photosynthetic growth by gas Knudsen diffusion. According to Knudsen diffusion, molecular concentration is the primary factor affecting diffusion flux (Yang et al, 2016). Thus, the higher CO 2 molecular concentration in the chamber, the more CO 2 transferred into the biofilm.…”

Section: Effect Of Co 2 Flow Rate On Growth Of C Vulgaris Biofilmmentioning

confidence: 99%

Comparison of Chlorella vulgaris biomass productivity cultivated in biofilm and suspension from the aspect of light transmission and microalgae affinity to carbon dioxide

Huang

Wang

Liu

et al. 2016

Bioresource Technology

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To investigate light transmission and cells affinity to CO, Chlorellavulgaris was attached to microfiltration membrane that laid on the solidified BG11 medium compared to that in suspended cultivation mode in this study. The results showed that C. vulgaris showed a 30.4% higher biomass production (103gm) in attached than in suspend system. The upper layer of biofilm with a thickness of 41.31μm (the corresponding areal density of 40gm) was effectively illuminated under light intensity of 120μmolms and more than 40% of the microalgal cells were in light even the areal density was high to 100gm. While only 2.5% of the cells were effectively illuminated in the suspended cultivation system. Furthermore, microalgae cells in biofilm showed a higher affinity to CO compared with that in suspension, and CO saturation point of microalgae cells in biofilm was 1.5% but 4.5% in suspension.

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Section: Effect Of Co 2 Flow Rate On Growth Of C Vulgaris Biofilmmentioning

confidence: 99%

Comparison of Chlorella vulgaris biomass productivity cultivated in biofilm and suspension from the aspect of light transmission and microalgae affinity to carbon dioxide

Huang

Wang

Liu

et al. 2016

Bioresource Technology

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“…The activity of SOFC anodes is well known to be dependent not only on materials but also on the microstructure and operating conditions [7,18,19]. Optimizing the operating conditions can both promote electrochemical methane oxidation and inhibit carbon deposition.…”

Section: Introductionmentioning

confidence: 99%

Controlled deposition and utilization of carbon on Ni-YSZ anodes of SOFCs operating on dry methane

Jiao

Zhang

et al. 2016

Energy

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Solid oxide fuel cells (SOFCs) are promising power-generation systems to utilize methane or methane-based fuels with a high energy efficiency and low environmental impact. A successive multi-stage process is performed to explore the operation of cells using dry methane or the deposited carbon from methane decomposition as fuel. Stable operation can be maintained by optimizing the fuel supply and current density parameters. An electrochemical impedance analysis suggests that the partial oxidization of Ni can occur at anodes when the carbon fuel is consumed. The stability of cells operated on pure methane is investigated in three operating modes. The cell can run in a comparatively stable state with continuous power output in an intermittent methane supply mode, where the deposition and utilization of carbon is controlled by balancing the fuel supply and consumption. The increase in the polarization resistance of the cell might originate from the small amount of NiO and residual carbon at the anode, which can be removed via an oxidation-and-reduction maintenance process. Based on the above strategy, this work provides an alternative operating mode to improve the stability of direct methane SOFCs and demonstrates the feasibility of its application.

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“…The results of Holcomb's study [40] showed that when the pore size of diffusion medium was less than 10 μm, the effect of Knudsen diffusion could not be ignored, and increased with the decrease of pore size. Yang et al [41] reported that Knudsen diffusion tended to contribute dominantly when the average pore size of diffusion medium was 2 μm. Thus, the similar pore size in HfO 2 skeleton was small enough to enable Knudsen diffusion for the outward species of silicon oxide.…”

Section: Resultsmentioning

confidence: 99%

Ablation of C/SiC-HfC composite prepared by precursor infiltration and pyrolysis in plasma wind tunnel

Duan

Luo²,

Liu

et al. 2020

J Adv Ceram

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Carbon fiber reinforced silicon carbide-hafnium carbide (C/SiC-HfC) composite was prepared by precursor infiltration and pyrolysis process. Then, ablation behavior of C/SiC-HfC was evaluated in plasma wind tunnel. It was found that oxide layer formed during ablation significantly influenced the surface temperature. Formation of dense HfO 2-SiO 2 layer under low heat flux led to stable surface temperature. Silica (SiO 2) on the surface was gradually consumed when heat flux increased, resulting in conversion of HfO 2-SiO 2 on the surface to HfO 2. Converted HfO 2 with high catalytic coefficient absorbed more energy, causing gradual increase in the surface temperature. Formed oxide layer was destroyed at high heat flux and high stagnation point pressure. After carbon fiber lost the protection of HfO 2-SiO 2 layer, it burned immediately, leading to surface temperature jump.

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Justifying the significance of Knudsen diffusion in solid oxide fuel cells

Cited by 25 publications

References 35 publications

Comparison of Chlorella vulgaris biomass productivity cultivated in biofilm and suspension from the aspect of light transmission and microalgae affinity to carbon dioxide

Comparison of Chlorella vulgaris biomass productivity cultivated in biofilm and suspension from the aspect of light transmission and microalgae affinity to carbon dioxide

Controlled deposition and utilization of carbon on Ni-YSZ anodes of SOFCs operating on dry methane

Ablation of C/SiC-HfC composite prepared by precursor infiltration and pyrolysis in plasma wind tunnel

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