| 沉淀法制备Na_(0.7)MnO_(2.05)及其水基超级电容器性能测试 |
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| 作者单位： | ;1.河南师范大学化学化工学院 |
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| 摘 要： | 以Mn(NO_3)_2和NaOH为原料,采用沉淀法合成了用作超级电容器电极材料Na_(0.7)MnO_(2.05).扫描电子显微镜(SEM)观察结果表明所制备样品呈层状板块形貌.电化学测试结果表明,Na_(0.7)MnO_(2.05)是一种性能比较优良的超级电容器电极材料.在1mol·L~(-1) Na_2SO_4电解质溶液中,0~1V的电压范围内,充放电电流密度为200mA·g~(-1)时,比容量高达201F·g~(-1),库伦效率接近100%.
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| 关 键 词： | 超级电容器 Na0.7 MnO2.05 沉淀法 水系电解质溶液 |
Na_(0.7)MnO_(2.05) via Chemical Precipitation Synthesis as an Electrode Material for Aqueous Na-ion Supercapacitors |
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| Institution: | ,College of Chemistry and Chemical Engineering,Henan Normal University |
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| Abstract: | Sodium manganese oxides Na_(0.7)MnO_(2.05) for supercapacitor electrode material was synthesized using Mn(NO_3)_2and NaOH via chemical precipitation method.The X-ray diffraction(XRD)and scanning electron microscopy(SEM)shows that the obtained Na_(0.7)MnO_(2.05) is single-phased with layered structure.The electrochemical performance was characterized by cyclic voltammetry(CV),impedance measurements and galvanostatic charge-discharge tests in symmetric Na-ion supercapacitors with 1mol·L~(-1) Na_2SO_4 solution as electrolyte.The Na_(0.7)MnO_(2.05) material shows a high specific capacity of about 201F·g~(-1) at a current density of 200mA·g~(-1) and a high coulombic efficiency approaching 100%,except the initial 50 cycles. |
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| Keywords: | supercapacitor Na0 7MnO2 05 precipitation method aqueous electrolyte |
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