Research Papers

Prediction of Direct Methanol Fuel Cell Stack Performance Using Artificial Neural Network

[+] Author and Article Information
M. A. Rafe Biswas

Department of Mechanical Engineering,
University of Texas at Tyler,
Tyler, TX 75799
e-mail: mbiswas@uttyler.edu

Melvin D. Robinson

Department of Electrical Engineering,
University of Texas at Tyler,
Tyler, TX 75799
e-mail: mrobinson@uttyler.edu

1Corresponding author.

Manuscript received December 14, 2016; final manuscript received April 30, 2017; published online June 21, 2017. Assoc. Editor: Matthew Mench.

J. Electrochem. En. Conv. Stor. 14(3), 031008 (Jun 21, 2017) (7 pages) Paper No: JEECS-16-1162; doi: 10.1115/1.4036811 History: Received December 14, 2016; Revised April 30, 2017

A direct methanol fuel cell (DMFC) converts liquid fuel into electricity to power devices, while operating at relatively low temperatures and producing virtually no greenhouse gases. Since DMFC performance characteristics are inherently complex, it can be postulated that artificial neural networks (NN) represent a marked improvement in prediction capabilities. In this work, an artificial NN is employed to predict the performance of a DMFC under various operating conditions. Input variables for the analysis consist of methanol concentration, temperature, current density, number of cells, and anode flow rate. The addition of the two latter variables allows for a more distinctive model when compared to prior NN models. The key performance indicator of our NN model is cell voltage, which is an average voltage across the stack and ranges from 0 to 0.8 V. Experimental studies were conducted using DMFC stacks with membrane electrode assemblies consisting of an additional unique liquid barrier layer to minimize water loss to atmosphere. To determine the best fit to the experimental data, the model is trained using two second-order training algorithms: OWO-Newton and Levenberg–Marquardt (LM). The topology of OWO-Newton algorithm is slightly different from that of LM algorithm by employing bypass weights. The application of NN shows rapid construction of a predictive model of cell voltage for varying operating conditions with an accuracy on the order of 104, which can be comparable to literature. The coefficient of determination of the optimal model results using either algorithm were greater than 0.998.

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Fig. 1

Schematic of the DMFC cell used in the experimental setup

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Fig. 2

VI curve of a four-cell DMFC stack under a steady-state operating condition

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Fig. 3

Illustration of a generic fully connected multilayer perceptron

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Fig. 4

Comparison of model VI curves to experimental data of a four-cell DMFC stack where NN models are based on OWO-Newton and LM

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Fig. 5

Comparison of model and experimental VI curves of an eight-cell DMFC stack where NN models are based on OWO-Newton and LM

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Fig. 6

Experimental and NN-based OWO-Newton model curves of a four-cell DMFC for operating temperatures of 45 °C and 60 °C

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Fig. 7

Experimental and NN-based LM Model curves of a four-cell DMFC for operating temperatures of 45 °C and 60 °C

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Fig. 8

Experimental and NN-based OWO-Newton model curves of a four-cell DMFC for operating methanol concentration of 1 M and 1.5 M

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Fig. 9

Experimental and NN-based LM Model curves of a four-cell DMFC for operating methanol concentration of 1 M and 1.5 M




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