The effect of the pH value of the anodic solution on the transmembrane transport of oxygen in microbial fuel cells

HUANG Dong; YAO Sen; SONG Bingye; HE Yaling

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The effect of the pH value of the anodic solution on the transmembrane transport of oxygen in microbial fuel cells

HUANG Dong #,YAO Sen,SONG Bingye,HE Yaling *

School of Energy & Power Engineering, Xi’an Jiaotong University, Xi’an 710049

*Correspondence author

#Submitted by

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Funding: 111 Project （No.B16038）, Specialized Research Fund for the Doctoral Program of Higher Education （No.20120201130006）, National Natural Science Foundation of China （No.51476125）

Opened online:17 May 2016

Accepted by: none

Citation: HUANG Dong,YAO Sen,SONG Bingye.The effect of the pH value of the anodic solution on the transmembrane transport of oxygen in microbial fuel cells[OL]. [17 May 2016] http://en.paper.edu.cn/en_releasepaper/content/4687878

In this paper, a molecular dynamic model is established to describe the transfer of oxygen in the cathode chamber through the Nafion membrane to the anode chamber of MFCs. The effect of the pH values of the anodic solution on the diffusion process is studied and the diffusion coefficient are calculated either. The law of oxygen transmembrane transport predicted by simulations is validated by experiments. The results of molecular dynamic simulations show that the diffusion coefficient of oxygen molecules increases sharply with the decrease of the pH value of the MFCs anodic solution. It appears that the lower the pH value is, the more easily the oxygen diffuses into the anode chamber. This conclusion is coherent with experimental results. The diffusion coefficient of hydronium ions is almost unchanged after the rise at first with the decrease of the pH value and has the saturation because of the limitation of the Nafion membrane ion exchange capacity. The radial distribution function analysis shows that the main factors affecting the oxygen molecules transmembrane diffusion are the free volume and motion of Nafion side chains.

Keywords:Engineering thermophysics; Microbial FFuel Cells, pH value, dissolved oxygen, diffusion coefficient

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