海泥孔隙率对海底微生物燃料电池电化学性能影响及有机质扩散分析

doi:10.16183/j.cnki.jsjtu.2023.081

上海交通大学学报 ›› 2024, Vol. 58 ›› Issue (10): 1567-1574.doi: 10.16183/j.cnki.jsjtu.2023.081

• 新型电力系统与综合能源 • 上一篇下一篇

海泥孔隙率对海底微生物燃料电池电化学性能影响及有机质扩散分析

李洋, 刘志, 宰学荣, 黄翔, 陈岩, 曹亚俐, 张怀静, 付玉彬()

中国海洋大学 a. 材料科学与工程学院; b. 化学化工学院; c. 海洋化学理论与工程技术教育部重点实验室;d. 海洋地球科学学院,山东青岛 266100

收稿日期:2023-03-09 修回日期:2023-07-12 接受日期:2023-07-18 出版日期:2024-10-28 发布日期:2024-11-01
通讯作者: 付玉彬,教授,博士生导师,电话(Tel.):0532-66782752;E-mail:ffyybb@ouc.edu.cn.
作者简介:李洋(1995—),博士生,从事海底微生物燃料电池研究.
基金资助:
国家自然科学基金资助项目(22075262)

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

LI Yang, LIU Zhi, ZAI Xuerong, HUANG Xiang, CHEN Yan, CAO Yali, ZHANG Huaijing, FU Yubin()

School of Materials Science and Engineering; b. College of Chemistry and Chemical Engineering;c. Key Laboratory of Marine Chemistry Theory and Technology; d. College of Marine Geosciences, Ocean University of China, Qingdao 266100, Shandong, China

Received:2023-03-09 Revised:2023-07-12 Accepted:2023-07-18 Online:2024-10-28 Published:2024-11-01

摘要/Abstract

摘要：

海底沉积物微生物燃料电池(MSMFC)在长期运行过程中,海泥孔隙率影响阳极表面水平方向有机质扩散,进而影响阳极电化学性能和电池功率输出.通过人工调节孔隙率在实验室模拟并研究孔隙率对MSMFC的影响,建立孔隙率与MSMFC产电量和水平扩散系数之间定量关系式.结果表明:随着孔隙率升高,阳极动力学活性先降低后升高,最高动力学活性是最低动力学活性的3.85倍;电池最大输出功率密度在孔隙率为45.2% 时,达到最大值206.8 mW/m².随着孔隙率的增大,有机质水平扩散系数升高,并与MSMFC产电量存在线性关系.当孔隙率为45.2%时,扩散系数为0.48 m²/s,MSMFC产电量达到804.04 J.该研究结果将为MSMFC在不同海域布放选址、阳极结构设计及电池长期产电运行提供技术支撑.

关键词: 海泥孔隙率, 海底微生物燃料电池, 电化学特性, 电池功率, 稳态扩散, 有机质水平扩散系数

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

中图分类号:

TM911.4

李洋, 刘志, 宰学荣, 黄翔, 陈岩, 曹亚俐, 张怀静, 付玉彬. 海泥孔隙率对海底微生物燃料电池电化学性能影响及有机质扩散分析[J]. 上海交通大学学报, 2024, 58(10): 1567-1574.

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.

图/表 20

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表9

不同孔隙率有机质水平扩散系数

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

表9

表A1

表A2

表A3

表A4

参考文献 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

海泥孔隙率对海底微生物燃料电池电化学性能影响及有机质扩散分析

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

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样品	阳极电位/mV	Φ/%
MSMFC-0	-427	38.4
MSMFC-1	-278	45.2
MSMFC-2	-269	49.6
MSMFC-3	-242	52.0

距离/ cm	含量/mg
距离/ cm	MSMFC-0	MSMFC-1	MSMFC-2	MSMFC-3
0	36.00	18.00	18.00	18.05
2	36.00	18.00	18.00	18.00
4	36.00	18.00	17.80	17.90
6	36.00	17.50	17.60	17.70
7	35.50	17.25	17.15	17.30

样品	关系式	R²
MSMFC-0	c=-0.398x + 36.420	0.880
MSMFC-1	c=-0.292x + 18.121	0.970
MSMFC-2	c=-0.282x + 18.130	0.970
MSMFC-3	c=-0.296x + 18.065	0.980

距离/ cm	含量/mg
距离/ cm	1次	2次	3次	4次	5次
0	36.00	36.00	36.00	36.00	36.00
2	36.00	36.00	36.00	36.00	36.00
4	36.00	36.00	35.80	35.50	35.10
6	36.00	35.55	34.50	34.40	34.30
7	35.50	34.50	33.50	33.20	33.15

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