發(fā)布時(shí)間：2018-04-22 15:00

  本文選題：β-FeOOH + BiFeO_3��； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟(jì)的飛速發(fā)展,傳統(tǒng)化石能源的短缺和環(huán)境污染已成為當(dāng)今社會(huì)迫切需要解決的嚴(yán)峻問題,因此以超級(jí)電容器和堿性二次電池為代表的清潔可再生的儲(chǔ)能器件已經(jīng)成為學(xué)者研究的重點(diǎn)。本文制備出β-FeOOH、Bi Fe O_3、La摻雜Bi_2O_3等三種電極材料,并與活性炭(C)或Ni(OH)2組裝成C//β-FeOOH非對(duì)稱超級(jí)電容器、BiFeO_3//Ni(OH)2堿性二次電池和La-Bi_2O_3//Ni(OH)2堿性二次電池以研究所制備材料的電化學(xué)性能。本論文的主要內(nèi)容如下:1.以FeCl_3為原料、水和乙二醇的混合液為溶劑,通過水熱法制備了β-FeOOH材料,并將其組裝成C//β-FeOOH非對(duì)稱超級(jí)電容器,研究其電化學(xué)性能。通過正交實(shí)驗(yàn)得出最佳的制備條件為:FeCl_3濃度為0.10 mol L-1,乙二醇與水的體積比為1:6,水熱溫度為145℃,水熱時(shí)間為6 h。該條件下制備的β-FeOOH材料在0.5 A g-1電流密度下,其比電容為642 F g-1,800次循環(huán)后保持初始比電容的72%。2.以Bi(NO_3)_3及Fe(NO_3)_3為原料、酒石酸為絡(luò)合劑,通過自蔓延燃燒法制備了BiFeO_3材料,將其與商品化Ni(OH)2正極材料組成BiFeO_3//Ni(OH)2堿性二次電池,研究其電化學(xué)性能。利用正交實(shí)驗(yàn)制備了不同條件下的BiFeO_3材料,得出最佳制備條件為:Bi(NO_3)_3濃度為0.10 mol L-1,反應(yīng)溫度為500℃,反應(yīng)時(shí)間為5 h,升溫速率為5℃min-1。該材料在1 A g-1電流密度下,其比容量為199mAh g-1,500次循環(huán)后保持初始比容量的62%。在此最佳制備基礎(chǔ)上,采用乙醇作為溶劑配制Bi(NO_3)_3和Fe(NO_3)_3的混合溶液,制備出性能更加優(yōu)良的BiFeO_3材料,在1 A g-1電流密度下其比容量高達(dá)238 mAh g-1,500次循環(huán)后保持初始比容量的79%。3.以Bi(NO_3)_3和La(NO_3)_3為原料、氫氧化鈉為沉淀劑,通過共沉淀法得到La摻雜Bi(OH)_3,通過條件實(shí)驗(yàn)得出最佳摻雜比例為nLa/nBi=0.075。在最佳摻雜比例的基礎(chǔ)上通過進(jìn)一步地高溫煅燒處理制得La摻雜Bi_2O_3,將其與商品化Ni(OH)2電極材料組裝成La-Bi_2O_3//Ni(OH)2堿性二次電池。所制備的La摻雜Bi_2O_3材料在1 A g-1的電流密度下其比容量為240 mAh g-1,500次循環(huán)后保持初始比容量的86%。
[Abstract]:With the rapid development of economy, the shortage of traditional fossil energy and environmental pollution has become a serious problem that needs to be solved urgently. Therefore, clean and renewable energy storage devices, represented by supercapacitors and alkaline secondary batteries, have become the focus of research. In this paper, three kinds of electrode materials such as 尾 -FeOHX BiFeO3La doped Bi_2O_3 have been prepared and assembled with activated carbon (C) or Ni(OH)2 to form C / 尾 -FeOOH asymmetric supercapacitors BiFeO-2 alkaline secondary battery and La-Bi_2O_3//Ni(OH)2 basic secondary battery to study the electrochemical properties of the prepared materials. The main contents of this thesis are as follows: 1. 尾 -FeOOH materials were prepared by hydrothermal method using FeCl_3 as raw material and mixed solution of water and ethylene glycol as solvent. The materials were assembled into C / 尾 -FeOOH asymmetric supercapacitors. The electrochemical properties of 尾 -FeOOH supercapacitors were studied. The optimum preparation conditions were obtained by orthogonal experiment: the concentration of 1: FeCl3 was 0.10 mol / L ~ (-1), the volume ratio of ethylene glycol to water was 1: 6, the hydrothermal temperature was 145 鈩，

本文編號(hào)：1787718