采用水热法合成海胆球形和单相纳米线形MnO2,并以X射线衍射、扫描电子显微镜、循环伏安、交流阻抗等方法对其进行测试.结果表明:相同反应条件下采用不同反应物可制备具有不同形貌的MnO2.海胆球形MnO2由单相γ-MnO2构成,其直径在1～10 μm之间;纳米线形MnO2由单相α-MnO2构成,直径约为50 nm,长度大于1 μm.两种形貌的MnO2在2 mol/L的(NH4)2SO4溶液中具有良好的电容特性,2 mA/cm2放电时海胆球状MnO2比容量值为244 F/g, 纳米线状MnO2比容量值为159 F/g.交流阻抗测试表明,海胆形MnO2作为电极材料,具有更良好的电容性能.
参考文献
| [1] | ARBIZZANI C;MASTRAGOSTINO M;SOAVI F .New trends in electrochemical supercapacitors[J].Journal of Power Sources,2001,100(1-2):164-170. |
| [2] | Huggins RA. .Supercapacitors and electrochemical pulse sources[J].Solid state ionics,2000(1/2):179-195. |
| [3] | Sang-Bok Ma;Kyun-Young Ahn;Eun-Sung Lee .Synthesis and characterization of manganese dioxide spontaneously coated on carbon nanotubes[J].Carbon: An International Journal Sponsored by the American Carbon Society,2007(2):375-382. |
| [4] | Toupin M.;Brousse T.;Belanger D. .Influence of microstucture on the charge storage properties of chemically synthesized manganese dioxide[J].Chemistry of Materials,2002(9):3946-3952. |
| [5] | MACHEFAUX E;BROUSSE T;B(E)LANGER D;GUYOMARD D .Supercapacitor behavior of new substituted manganese dioxides[J].Journal of Power Sources,2007,165:651-655. |
| [6] | Li XL;Li WJ;Chen XY;Shi CW .Hydrothermal synthesis and characterization of orchid-like MnO2 nanostructures[J].Journal of Crystal Growth,2006(2):387-389. |
| [7] | Ye C;Lin ZM;Hui SZ .Electrochemical and capacitance properties of rod-shaped MnO2 for supercapacitor[J].Journal of the Electrochemical Society,2005(6):A1272-A1278. |
| [8] | RAVINDER N R;RAMANA G R .Synthesis and electrochemical characterization of amorphous MnO2 electrochemical capacitor electrode material[J].Journal of Power Sources,2004,132:315-320. |
| [9] | 袁中直,周震涛,李伟善,孙峰.α-MnO2纳米棒在1 mol/L KOH溶液中的电容行为[J].中国锰业,2004(04):23-26,30. |
| [10] | Du GH;Yuan ZY;Van Tendeloo G .Transmission electron microscopy and electron energy-loss spectroscopy analysis of manganese oxide nanowires[J].Applied physics letters,2005(6):3113-1-3113-3-0. |
| [11] | WANG X Y;HUANG W G;SEBASTIAN P J;GAMBOA S .Sol-gel template synthesis of highly ordered MnO2 nanowire arrays[J].Journal of Power Sources,2005,140(01):211-215. |
| [12] | Li ZQ;Ding Y;Xiong YJ;Xie Y .Rational growth of various alpha-MnO2 hierarchical structures and beta-MnO2 nanorods via a homogeneous catalytic route[J].Crystal growth & design,2005(5):1953-1958. |
| [13] | TAKAKI Y;TANIGUCHI T;HORI K .Program package for obtaining unit-cell constants and possible space group from X-ray powder diffraction data[J].Journal of the Ceramic Society of Japan,1993,101:373-375. |
| [14] | HILL L I;VERBAERE A;GUYOMARD D .MnO2 (α-,γ-,γ-) compounds prepared by hydrothermal-electrochemical synthesis:Characterization,morphology,and lithium insertion behavior[J].Journal of Power Sources,2003,119-121:226-231. |
| [15] | Lili Zhao;Rongshu Wang .γ-MnO_2 nano-sieve membrane: preparation, characterization and reaction studies[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2004(1/4):217-222. |
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