Abstract
Fuel cells are finding wide range of applications from small capacity cells used for portable electronic devices to large capacity stacks for automobile applications. Among the different types of fuel cells, passive Direct methanol fuel cell (DMFC) has many advantages because of its simplicity. This paper presents the effect of Anode Diffusion Layer (ADL) thickness and its porosity on the performance of a passive DMFC. A one-dimensional, non-isothermal model is developed in MATLAB environment for exploring the complex physicochemical phenomena taking place inside the passive DMFC, by considering both heat and mass transfer effects. Modeling studies have been carried out by varying the ADL thickness from 0.1 mm to 0.6 mm, and the ADL porosity from 0.3 to 0.8. The concentration distribution of methanol, water and oxygen inside the cell have been predicted and, the crossover of methanol and water across the membrane have also been estimated. It is observed that increase in thickness of the ADL decreases the methanol corss over. Further, the effect of ADL thickness and porosity on the anodic overpotential and cathodic overpotential have been estimated. It was observed that increase in ADL thickness as well as its porosity increase the overpotentials.
Acknowledgements
The authors acknowledged the financial support provided by DST-SERB, Govt. of India and TEQIP-II-CoE, National Institute of Technology, Warangal.
References
[1] Patnaikuni VS. CFD simulation of flow through the reconstructed microstructure of fibrous gas di昀fusion layer in a polymer electrolyte membrane fuel cell, 2017:1–15.10.1515/cppm-2017-0008Search in Google Scholar
[2] Ren X, Springer TE, Zawodzinski TA, Gottesfeld S. Methanol transport through nafion membranes - electro-osmotic drag effects on potential step measurements. J Electrochem Soc. 2000;147:466–74.10.1149/1.1393219Search in Google Scholar
[3] Hikita S, Yamane K, Nakajima Y. Measurement of methanol crossover in direct methanol fuel cell. JSAE Rev. 2001;22:151–6.10.1016/S0389-4304(01)00086-8Search in Google Scholar
[4] Wang J-T. Real-time mass spectrometric study of the methanol crossover in a direct methanol fuel cell. J Electrochem Soc. 1996;143:1233.10.1149/1.1836622Search in Google Scholar
[5] Guo H, Chen YP, Xue YQ, Ye F, Ma CF. Three-dimensional transient modeling and analysis of two-phase mass transfer in air-breathing cathode of a fuel cell. Int J Hydrogen Energy. 2013;38:11028–37.10.1016/j.ijhydene.2013.03.054Search in Google Scholar
[6] Xu C, Faghri A. Water transport characteristics in a passive liquid-feed DMFC. Int J Heat Mass Transf. 2010;53:1951–66.10.1016/j.ijheatmasstransfer.2009.12.060Search in Google Scholar
[7] Chen R, Zhao TS. Mathematical modeling of a passive-feed DMFC with heat transfer effect. J Power Sources. 2005;152:122–30.10.1016/j.jpowsour.2005.02.088Search in Google Scholar
[8] Shrivastava NK, Thombre SB, Wasewar KL. Nonisothermal mathematical model for performance evaluation of passive direct methanol fuel cells, no. December, 2013:266–74.10.1061/(ASCE)EY.1943-7897.0000112Search in Google Scholar
[9] Shrivastava NK, Thombre SB, Wasewar KL. A real-time simulating non-isothermal mathematical model for the passive feed direct methanol fuel cell. Int J Green Energy. 2016;13:213–28.10.1080/15435075.2014.916220Search in Google Scholar
[10] Zou J, He Y, Miao Z, Li X. Non-isothermal modeling of direct methanol fuel cell. Int J Hydrogen Energy. 2010;35:7206–16.10.1016/j.ijhydene.2010.01.123Search in Google Scholar
[11] Methanol D, Cells F, Shrivastava NK, Thombre SB, Wasewar KL. Nonisothermal mathematical model for performance evaluation of passive nonisothermal mathematical model for performance evaluation of passive direct methanol fuel cells. no. December, 2013.10.1061/(ASCE)EY.1943-7897.0000112Search in Google Scholar
[12] Rice J, Faghri A. Thermal and start-up characteristics of a miniature passive liquid Feed DMFC system, including continuous/discontinuous phase limitations. J Heat Transfer. 2008;130:062001.10.1115/1.2891156Search in Google Scholar
[13] Oliveira VB, Rangel CM, Pinto AM. One-dimensional and non-isothermal model for a passive DMFC. J Power Sources. 2011;196:8973–82.10.1016/j.jpowsour.2011.01.094Search in Google Scholar
[14] Liu JG, Zhao TS, Liang ZX, Chen R. Effect of membrane thickness on the performance and efficiency of passive direct methanol fuel cells. J Power Sources. 2006;153:61–7.10.1016/j.jpowsour.2005.03.190Search in Google Scholar
[15] Rice J, Faghri A. A transient, multi-phase and multi-component model of a new passive DMFC. Int J Heat Mass Transf. 2006;49:4804–20.10.1016/j.ijheatmasstransfer.2006.06.003Search in Google Scholar
[16] Scott K, Taama W, Cruickshank J. Performance and modelling of a direct methanol solid polymer electrolyte fuel cell. J Power Sources. 1997;65:159–71.10.1016/S0378-7753(97)02485-3Search in Google Scholar
[17] Zhao TS, Yang WW, Chen R, Wu QX. Towards operating direct methanol fuel cells with highly concentrated fuel. J Power Sources. 2010;195:3451–62.10.1016/j.jpowsour.2009.11.140Search in Google Scholar
[18] Bahrami H, Faghri A. Exergy analysis of a passive direct methanol fuel cell. J Power Sources. 2011;196:1191–204.10.1016/j.jpowsour.2010.08.087Search in Google Scholar
[19] Guo H, Ma CF. 2D analytical model of a direct methanol fuel cell. Electrochem Commun. 2004;6:306–12.10.1016/j.elecom.2004.01.005Search in Google Scholar
[20] Vera M. A single-phase model for liquid-feed DMFCs with non-Tafel kinetics. J Power Sources. 2007;171:763–77.10.1016/j.jpowsour.2007.05.098Search in Google Scholar
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