Effect of Sediment Porosity on Electrochemical Performance of Marine Sediment Microbial Fuel Cells and Analysis of Organic Matter Diffusion

doi:10.16183/j.cnki.jsjtu.2023.081

Abstract

Abstract:

During the long-term operation of marine sediment microbial fuel cell (MSMFC) on the ocean floor, the sediment porosity affects the horizontal diffusion coefficient of organic matter near the anode,which finally influences the anodic electrochemical performance and the power output of cells. In this paper, the sediment with different sediment porosities is established in lab by artificially adjusting sediment porosity to investigate its influence on the performance of MSMFC, so as to creatively build the mathematical relationship between the energy production of MSMFC and the horizontal diffusion coefficient. With the increase of sediment porosity, the anode kinetic activity decreases and then increases, the highest kinetic activity is 3.85 times higher than the lowest kinetic activity. When the sediment porosity is 45.2%, the maximum power output reaches 206.8 mW/m². Horizontal diffusion coefficient of organic increases with an increase in sediment porosity, and it has a linear relationship with the energy production of MSMFC. When the sediment porosity is 45.2%, the horizontal diffusion coefficient is 0.48 m²/s, and the energy production of MSMFC reaches 804.04 J. These results render a technological base for the site choice of MSMFC deploying in different marine sediments, anode design and battery operation for long term.

Key words: sediment porosity, marine sediment microbial fuel cell (MSMFC), anode electrochemical properties, cell power, steady-state diffusion, horizontal diffusion coefficient of organic matter

CLC Number:

TM911.4

LI Yang, LIU Zhi, ZAI Xuerong, HUANG Xiang, CHEN Yan, CAO Yali, ZHANG Huaijing, FU Yubin. Effect of Sediment Porosity on Electrochemical Performance of Marine Sediment Microbial Fuel Cells and Analysis of Organic Matter Diffusion[J]. Journal of Shanghai Jiao Tong University, 2024, 58(10): 1567-1574.

Figures/Tables 20

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Horizontal diffusion coefficient of organic matter with different porosities

样品	Φ/%	$∂ c ∂ x$	J_m/[mg· (m²·s)^-1]	D_m/ (m²·s^-1)	单位时间产电量/ (J·d^-1)
MSMFC-0	38.4	-0.398	0.0129	0.32	14.46
MSMFC-1	45.2	-0.292	0.0143	0.48	16.08
MSMFC-2	49.6	-0.282	0.0126	0.44	14.15
MSMFC-3	52.0	-0.296	0.0133	0.45	14.93

Tab.9

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References 17

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样品	石英砂比例(粒径/μm 150∶300∶850)	质量比 (海底沉积物∶总砂)
MSMFC-0	0∶0∶0	1∶0
MSMFC-1	1∶2∶3	1∶1
MSMFC-2	1∶1∶2	1∶1
MSMFC-3	1∶1∶1	1∶1

样品	质量/g		失水量/g	失水率/%	Φ/ %
样品	冷冻干燥前	冷冻干燥后	失水量/g	失水率/%	Φ/ %
MSMFC-0	22.04	20.12	1.92	38.4	38.4
MSMFC-1	21.06	19.93	1.13	22.6	45.2
MSMFC-2	22.30	21.06	1.24	24.8	49.6
MSMFC-3	22.23	20.93	1.30	26.0	52.0

样品	氧化峰		还原峰		C/ mF
样品	i/mA	φ/V	i/mA	φ/V	C/ mF
MSMFC-0	0.479	0.066	-0.402	-0.268	82.3
MSMFC-1	0.145	0.039	-0.136	-0.286	33.6
MSMFC-2	0.214	0.028	-0.241	-0.318	47.3
MSMFC-3	0.233	-0.002	-0.294	-0.320	56.4

样品	i₀×10³/(mA·cm^-2)	K
MSMFC-0	9.462	1.00
MSMFC-1	2.465	0.26
MSMFC-2	2.739	0.29
MSMFC-3	3.204	0.34

样品	P_max/(mW·m^-2)	Q/J	倍率关系
MSMFC-0	185.90	722.78	1.00
MSMFC-1	206.80	804.04	1.11
MSMFC-2	182.00	707.62	0.98
MSMFC-3	192.00	746.50	1.03