本文選題：金屬空氣電池　切入點(diǎn)：復(fù)合材料　出處：《山西師范大學(xué)》2017年碩士論文

【摘要】：全球范圍內(nèi)能源需求的逐步增長(zhǎng)以及生態(tài)環(huán)境的日益惡化,推動(dòng)了可持續(xù)能源轉(zhuǎn)換和存儲(chǔ)技術(shù)的快速發(fā)展。金屬空氣電池作為一種新型的電池體系,因其高能量密度,低成本以及環(huán)境友好等優(yōu)點(diǎn)已然引發(fā)眾多科研工作者的關(guān)注。然而,氧電極緩慢的電化學(xué)反應(yīng)動(dòng)力學(xué)阻礙其商業(yè)化道路。因此,研究開發(fā)具備氧還原反應(yīng)(ORR)和氧析出反應(yīng)(OER)活性的雙功能催化劑成為關(guān)鍵因素�；谝陨蠁栴},本文主要制備了三種以過渡金屬氧化物為主的復(fù)合材料,并研究其作為金屬空氣電池氧電極雙功能催化劑的催化活性,主要內(nèi)容如下:首先,以活性碳為基底利用一步溶劑熱法首次合成Ag-CoFe_2O_4/C納米復(fù)合材料。所制備的Ag-CoFe_2O_4/C納米復(fù)合材料在堿性溶液中表現(xiàn)出良好的ORR和OER催化活性。這是因?yàn)镃oFe_2O_4的加入阻礙了Ag納米顆粒的團(tuán)聚,使復(fù)合材料表面暴露出更多的活性位點(diǎn)。與此同時(shí),Ag與CoFe_2O_4之間產(chǎn)生的電子效應(yīng)也促進(jìn)了Ag-CoFe_2O_4/C納米復(fù)合材料電化學(xué)性能的提升。此外,Ag-CoFe_2O_4/C催化劑表現(xiàn)出較好的抗甲醇能力以及穩(wěn)定性。其次,采用溶劑熱法制備MnO_2-CoFe_2O_4/C納米復(fù)合材料。經(jīng)過電化學(xué)測(cè)試發(fā)現(xiàn),MnO_2-CoFe_2O_4/C催化劑具有比MnO_2/C、CoFe_2O_4/C以及MnO_2/C+CoFe_2O_4/C(機(jī)械混合)都要好的ORR和OER催化活性。此外,通過對(duì)不同質(zhì)量比的MnO_2-CoFe_2O_4/C的催化活性進(jìn)行比較,可以得出,當(dāng)MnO_2與CoFe_2O_4的質(zhì)量比為1:1時(shí),其ΔE值最小,即MnO_2-CoFe_2O_4/C(1:1)具有最好的氧電極催化活性。最后,經(jīng)過兩步水熱法合成以MnOOH納米棒為基底的CoMn_2O_4/MnOOH納米復(fù)合材料。其中,MnOOH不僅作為載體,還為合成CoMn_2O_4提供錳源。經(jīng)測(cè)試可得,CoMn_2O_4/MnOOH具有較高的電化學(xué)活性面積(ECSA),這為氧還原反應(yīng)提供更多的活性位點(diǎn)。同時(shí),CoMn_2O_4與MnOOH的之間產(chǎn)生的協(xié)同效應(yīng)也對(duì)ORR性能有促進(jìn)作用。此外,CoMn_2O_4/MnOOH復(fù)合材料在堿性條件下表現(xiàn)出較好的OER催化性能,并且在抗甲醇能力以及穩(wěn)定性方面都有出色表現(xiàn)。而且,較小的ΔE值說明CoMn_2O_4/MnOOH具備作為氧電極雙功能催化劑的潛能。
[Abstract]:The rapid development of sustainable energy conversion and storage technology is promoted by the gradual growth of global energy demand and the worsening of ecological environment. As a new type of battery system, metal air battery has high energy density. The advantages of low cost and environmental friendliness have attracted the attention of many researchers. However, the slow electrochemical reaction kinetics of oxygen electrode hinders its commercialization. The research and development of bifunctional catalysts with the activity of oxygen reduction reaction (ORR) and oxygen precipitation reaction (ORR) have become the key factors. Based on the above problems, three kinds of composite materials with transition metal oxides (TME) were prepared. Its catalytic activity as a bifunctional catalyst for oxygen electrode of metal air battery is studied. The main contents are as follows: first of all, Ag-CoFe_2O_4/C nanocomposites were synthesized by one-step solvothermal method using activated carbon as substrate. The prepared Ag-CoFe_2O_4/C nanocomposites exhibited good catalytic activity of ORR and OER in alkaline solution. This is because the addition of CoFe_2O_4 hinders Ag. The agglomeration of nanoparticles, At the same time, the electronic effect between Ag and CoFe_2O_4 also promoted the improvement of electrochemical performance of Ag-CoFe_2O_4/C nanocomposites. In addition, Ag-CoFe2O4 / C catalyst showed better methanol resistance. Force and stability. Second, MnO_2-CoFe_2O_4/C nanocomposites were prepared by solvothermal method. Electrochemical tests showed that the catalyst MNO\ +\'s\ + _ (2) /\%\%\%\%\\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\%\. It can be concluded that when the mass ratio of MnO_2 to CoFe_2O_4 is 1:1, its 螖 E value is the smallest, that is, MNO _ 2-CoFe _ 2O _ 4 / C _ 2O _ 1: 1: 1) has the best catalytic activity on oxygen electrode. Finally, CoMn_2O_4/MnOOH nanocomposites based on MnOOH nanorods are synthesized by two-step hydrothermal method. It is found that CoMn2O4 / MnOOH has a higher electrochemical active area and this provides more active sites for the oxygen reduction reaction. At the same time, the synergistic effect between CoMn2O4 and MnOOH also promotes the performance of ORR. In addition, CoMn2O4 / MnOOH composites show better OER catalytic performance under alkaline conditions. Moreover, the small 螖 E value indicates that CoMn_2O_4/MnOOH has the potential as a bifunctional catalyst for oxygen electrode.
【學(xué)位授予單位】：山西師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：O643.36;TM911.41

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本文編號(hào)：1667097