半晶化双螺旋介孔MnO2的合成和电化学性质

Mesoporous silica KIT-6 has novel three-dimensional gyroidal channel structure, space group of 1a-3d, and ordered tunable pores up to 10 nm. In this paper, such mesostructured silica was employed as hard template to prepare semicrystalline gyroidal mesoporous MnO2. The structure was investigated by XRD, TEM and HRTEM, and found to be of high quality 1a-3d symmetry, in good accordance with the template structure. The material has a BET surface of 118 m2·g^-1 and pore volume of 0.35 cm3·g^- 1 after eliminating template. Mesoporous MnO2 has shown good electrochemical property as supercapacitor material in 1 mol·L^-1 Na2SO4 and 1 mol·L^-1 LiClO4 solutions, but interesting pseudocapacitance behavior was observed in the case of 6 mol·L^-1 KOH. It was found that mesoporous MnO2 performed stable reversible electrochemical behavior with capacitance of 220 F·g^-1 in a potential range of -0.1-0.55 V vs. Hg/HgO in alkaline solution, demonstrating that it is a promising novel electrode material for the fabrication of electrochemical capacitors.

Synthesis and Electrochemical Properties of Semicrystalline Gyroidal Mesoporous MnO2

Mesoporous silica KIT‐6 has novel three‐dimensional gyroidal channel structure, space group of Ia‐3d, and ordered tunable pores up to 10 nm. In this paper, such mesostructured silica was employed as hard template to prepare semicrystalline gyroidal mesoporous MnO₂. The structure was investigated by XRD, TEM and HRTEM, and found to be of high quality Ia‐3d symmetry, in good accordance with the template structure. The material has a BET surface of 118 m²·g^‐1 and pore volume of 0.35 cm³·g^?1 after eliminating template. Mesoporous MnO₂ has shown good electrochemical property as supercapacitor material in 1 mol·L^?1 Na₂SO₄ and 1 mol·L^?1 LiClO₄ solutions, but interesting pseudocapacitance behavior was observed in the case of 6 mol·L^?1 KOH. It was found that mesoporous MnO₂ performed stable reversible electrochemical behavior with capacitance of 220 F·g^?1 in a potential range of ?0.1–0.55 V vs. Hg/HgO in alkaline solution, demonstrating that it is a promising novel electrode material for the fabrication of electrochemical capacitors.