二氧化锰晶型对MSMFCs阴极电化学性能的影响  

Effects of crystal structure of MnO_(2) on electrochemical performance of cathode of marine sediment microbial fuel cells

作　　者：魏书香 李洋 钟莲[2] 金顶峰[3] 付玉彬[1] WEI Shuxiang;LI Yang;ZHONG Lian;JIN Dingfeng;FU Yubin(School of Materials Science and Engineering,Ocean University of China,Qingdao Shandong 266100,China;College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao Shandong 266100,China;College of Materials and Chemistry,China Jiliang University,Hangzhou Zhejiang 310018,China)

机构地区：[1]中国海洋大学材料科学与工程学院,山东青岛266100 [2]中国海洋大学化学化工学院,山东青岛266100 [3]中国计量大学材料与化学学院,浙江杭州310018

出　　处：《电源技术》2024年第10期1922-1930,共9页Chinese Journal of Power Sources

基　　金：国家自然科学基金(22075262)。

摘　　要：海水环境中较低的阴极催化活性严重限制海泥电池(MSMFCs)长期输出功率。碳毡阴极经二氧化锰(MnO_(2))改性可显著提高海泥电池阴极溶氧还原动力学和电化学性能,进而提升电池输出功率。利用水热法合成4种晶型(α、β、γ和δ)MnO_(2)用于海泥电池阴极改性,研究了4种晶型MnO_(2)对海泥电池阴极电化学性能的影响并进行了机理分析。结果表明,与空白对照组相比,4种晶型MnO_(2)均可显著提高阴极抗极化性能、电容性能、交换电流密度和最大输出功率;其中,β-MnO_(2)由于具有高浓度的Mn3+和氧空位,大幅提高了阴极氧还原活性和电化学性能,使比电容最高达846.08 F/m^(2),功率密度最高达700.2 mW/m^(2)。该结果有利于促进设计低溶氧海水条件下海泥电池阴极,进而开发高功率海底原位电源。The low cathodic catalytic activity in seawater environment severely limits the output power of the marine sediment microbial fuel cells(MSMFCs)as a long-term power source.The cathode modified by manganese dioxide(MnO_(2))significantly improves the kinetics and electrochemical performance of dissolved oxygen reduction of the MSMFCs cathode and improves the output power of MSMFCs.Four kinds of crystalline structure(α、β、γandδ)MnO_(2) were synthesized by the hydrothermal method for the cathode modification,the impact of four kinds of crystalline structure MnO_(2) on the electrochemical performance of MSMFCs cathode was researched,and the mechanism analysis was conducted.The results demonstrate that compared with the blank control group,four kinds of crystalline structure MnO_(2) significantly improve the cathodic polarization resistance,capacitance,exchange current density and maximum output power.Among them,β-MnO_(2) significantly improves the cathode oxygen reduction activity and electrochemical performance due to its high concentration of Mn3+and oxygen vacancies,resulting in the highest specific capacitance up to 846.08 F/m^(2) and the highest power density up to 700.2 mW/m^(2).The results are conducive to the cathode design of MSMFCs in low dissolved oxygen seawater,thereby developing high power in situ marine power sources.

关 键 词：海底沉积物微生物燃料电池 二氧化锰 晶型 阴极改性 电化学性能 输出功率 

分 类 号：TM911.4[电气工程—电力电子与电力传动]