A precursor route to synthesize mesoporous gamma-MnO2 microcrystals and their applications in lithium battery and water treatment

作者：Li Jingfa; Xi Baojuan; Zhu Yongchun^*; Li Qianwen; Yan Yan; Qian Yitai

来源：Journal of Alloys and Compounds, 2011, 509(39): 9542-9548.

DOI：10.1016/j.jallcom.2011.07.064

• Nanostructures
• Chemical synthesis
• Thermal analysis

MnCO3 microstructures, including 2.3 mu m microplates with the thickness of 200 nm and 3.1 mu m microspheres stacked with 50 nm-thick sheets, were hydrothermally prepared in the assistance of sodium dodecyl benzene sulphonate (SDBS) and dodecyl sulfonic acid sodium (SDS), respectively. With the as-synthesized MnCO3 as precursors followed by annealing at 400 degrees C for 4 h, mesoporous gamma-MnO2 microplates and microspheres with the pore size of 4-50 nm, which basically preserved the initial shapes, were obtained. The Brunauer-Emmett-Teller surface areas of the as-prepared gamma-MnO2 microplates and microspheres were 52.1 m(2) g(-1) and 50.2 m(2) g(-1), respectively. The electrochemical property tests over Li+ batteries showed that the initial discharge capacity of gamma-MnO2 microplates and microspheres were 1997 mAh g(-1) and 1533 mAh g(-1). Noticeably, even after 100 cycles, the discharge capacity of gamma-MnO2 microplates was still as high as 626 mAh g(-1), indicating the decent cycle behavior. In addition, mesoporous gamma-MnO2 was also applied as adsorbents in water treatment, and gamma-MnO2 microplates and microspheres could remove about 55% and 80% of Congo red.

• 出版日期2011-9-29
• 单位中国科学技术大学