本文選題：陽極生物膜 + 陽極界面雙電層電容��； 參考：《浙江大學(xué)》2014年碩士論文

【摘要】：本文從陽極電阻、陽極材料電容和電池放電電壓曲線三方面研究了微生物燃料電池生物陽極結(jié)構(gòu)和產(chǎn)電性能性能。 本文應(yīng)用MATLAB數(shù)值模擬研究了大型化微生物燃料電池陽極電流導(dǎo)出形式對(duì)電池產(chǎn)電功率的影響,并通過實(shí)驗(yàn)結(jié)果驗(yàn)證計(jì)算結(jié)果的準(zhǔn)確性。實(shí)驗(yàn)結(jié)果表明：不當(dāng)?shù)倪B接方式會(huì)造成21.7%的產(chǎn)電性能下降,結(jié)合計(jì)算和實(shí)驗(yàn)的結(jié)果推斷在微生物燃料電池大型化的過程中,不當(dāng)?shù)倪B接造成的功率損失占陽極總功率損失的47.1%。本文還提出兩種降低電阻造成產(chǎn)電功率損失的途徑：(1)采用金屬網(wǎng)作為集電體；(2)采用合理的高效的電流導(dǎo)出形式。 通過改變陽極材料界面雙電層電容研究了陽極材料電容對(duì)生物膜生長的影響。實(shí)驗(yàn)結(jié)果表明：增大陽極表面的雙電層電容可顯著提高電池的產(chǎn)電性能。用35目不銹鋼網(wǎng)載超級(jí)電容器活性炭電極作為陽極的微生物燃料電池的功率密度最高可以達(dá)到585mWm-2。而載200nm粒徑納米活性炭作為陽極的電池功率密度只有31mWm-2。電池功率隨著雙電層電容的增大而增加,而與電極表面積相關(guān)度低。掃描電子顯微鏡的結(jié)果表明,陽極材料電容的增大使得陽極表面附著的微生物膜厚度、覆蓋度增加,生物量的增加可能是功率密度隨雙電層電容增大而增加的原因。載超級(jí)電容器活性炭的電極的平均生物膜厚度為259urn,是在納米活性碳電極生物膜厚度的203.1%。 以補(bǔ)料式單室空氣陰極微生物燃料電池首次研究了更換溶液之后電池電壓的恢復(fù)過程和影響因素。研究發(fā)現(xiàn),更換溶液后,以碳纖維材料為陽極的微生物燃料電池的放電電壓曲線上出現(xiàn)兩個(gè)電壓平臺(tái)(對(duì)應(yīng)陽極電位分別為-250~-290mV和-390±10mV)。電壓平臺(tái)的現(xiàn)象主要和陽極有關(guān),與陰極無關(guān)。碳刷陽極的電池第一個(gè)電壓平臺(tái)持續(xù)時(shí)間比碳纖維布陽極長。第一個(gè)電壓平臺(tái)受陽極表面特性的影響,其形成的原因可能是微生物燃料電池部分電流對(duì)陽極的雙電層電容充電的過程；第二個(gè)電壓平臺(tái)與溶解氧有關(guān),溶解氧增加會(huì)導(dǎo)致第二個(gè)電壓平臺(tái)的持續(xù)時(shí)間增加,并使得陽極性能變差。第二個(gè)電壓平臺(tái)的形成可能是陽極附近溶液從厭氧環(huán)境到微氧環(huán)境的變化造成的。
[Abstract]:In this paper, the structure and electrical properties of microbial fuel cell biological anode were studied from three aspects: anode resistance, anode capacitance and discharge voltage curve. In this paper, the influence of anodic current derived form on the output power of large scale microbial fuel cell is studied by MATLAB numerical simulation, and the accuracy of the calculated results is verified by the experimental results. The experimental results show that the power loss caused by improper connection will decrease by 21.7%. Combined with the calculation and experimental results, it is inferred that the power loss caused by improper connection accounts for 47.1% of the total anode power loss in the process of microbial fuel cell enlargement. This paper also proposes two ways to reduce the loss of electrical power caused by resistance: 1) the metal net is used as the collector and the current is derived in a reasonable and efficient way. The effect of anode capacitance on the growth of biofilm was studied by changing the double layer capacitance of anode interface. The experimental results show that increasing the double layer capacitance on the anode surface can significantly improve the electrical performance of the battery. The maximum power density of microbial fuel cell with 35 mesh stainless steel net-loaded activated carbon electrode as anode can reach 585 mWm-2. However, the power density of the anode with 200nm particle size nano-activated carbon was only 31 mWm-2. The power of the battery increases with the increase of the double layer capacitance, but the correlation with the electrode surface area is low. The results of scanning electron microscope (SEM) show that the increase of the capacitance of anode material can increase the thickness and coverage of the microbial film attached to the anode surface, and the increase of biomass may be the reason for the increase of power density with the increase of the double layer capacitance. The average biofilm thickness of the activated carbon electrode loaded with supercapacitor is 259 urn, which is 203.1 the thickness of the biofilm on the nanocrystalline activated carbon electrode. The recovery process and influencing factors of the battery voltage after changing solution were studied for the first time with the recharge single chamber air cathode microbial fuel cell. It was found that two voltage platforms appeared on the discharge voltage curve of microbial fuel cell with carbon fiber as anode after changing solution. The corresponding anode potentials were -250 ~ 290mV and -390 鹵10mV respectively. The phenomenon of voltage platform is mainly related to anode and independent of cathode. Carbon brush anode battery first voltage platform duration longer than carbon fiber cloth anode. The first voltage platform is affected by the surface characteristics of the anode, which may be due to the charging process of the partial current of the microbial fuel cell to the anode's double-layer capacitance, and the second voltage platform is related to the dissolved oxygen. The increase of dissolved oxygen will increase the duration of the second voltage platform and make the anode performance worse. The formation of the second voltage platform may be caused by the change of anodic solution from anaerobic environment to micro-oxygen environment.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM911.4

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本文編號(hào)：1949611