纳米MnO2的制备及显微结构和电化学性能
Preparation, Microstructure and Electrochemical Performance of Nano-Sized MnO2
摘 要
将KMnO4负载在介孔二氧化硅KIT-6模板上，在不同温度（400~700℃）煅烧制备纳米MnO2，研究了不同煅烧温度下纳米MnO2的显微结构和电化学性能。结果表明：当煅烧温度为400℃时，制备得到的纳米MnO2只由具有层状结构的δ-MnO2组成，当煅烧温度升高至500℃时，纳米MnO2由具有层状结构的δ-MnO2和少量具有隧道结构的α-MnO2组成，当煅烧温度为600，700℃时，纳米MnO2均由具有隧道结构的α-MnO2组成，且α-MnO2分别呈有序介孔形貌和棒状形貌；具有隧道结构的α-MnO2的循环稳定性优于具有层状结构δ-MnO2的，在100 mA·g-1电流密度下经50次循环充放电后仍具有100 mAh·g-1以上的放电容量。
介孔
电化学性能
α-MnO2
δ-MnO2
nano-sized MnO2
mesoporous
electrochemical performance
α-MnO2
δ-MnO2
Abstract
Nano-sized MnO2 was synthesized by loading KMnO4 on a mesoporous silica KIT-6 template and calcination at different temperatures (400-700℃). The microstructure and electrochemical performance of nano-sized MnO2 at different calination temperatures were studied. The results show that the prepared nano-sized MnO2 was composed of δ-MnO2 with layered structure when calcined at 400℃, δ-MnO2 with layered structure and a small amount of α-MnO2 with tunnel structure when calcined at 500℃, α-MnO2 with tunnel structure which presented ordered mesoporous morphology and rod shape morphology, respectively, when calcined at 600℃ and 700℃. The α-MnO2 with tunnel structure showed a better cycling stability than that of δ-MnO2 with layered structure, and had a discharge capacity more than 100 mAh·g-1 after 50 cycles of charge-discharge at a current density of 100 mA·g-1.
中图分类号 TQ127.1 DOI 10.11973/jxgccl201807006
所属栏目 材料性能及应用
基金项目
收稿日期 2018/4/2
修改稿日期 2018/6/12
网络出版日期
作者单位点击查看
备注汤慧利(1980-),女,湖北襄阳人,工程师,博士
引用该论文: TANG Huili,REN Yu. Preparation, Microstructure and Electrochemical Performance of Nano-Sized MnO2[J]. Materials for mechancial engineering, 2018, 42(7): 28～31
汤慧利,任瑜. 纳米MnO2的制备及显微结构和电化学性能[J]. 机械工程材料, 2018, 42(7): 28～31
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参考文献
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【2】TIEMANN M. Porous metal oxides as gas sensors[J]. Chemistry-A:European Journal, 2007, 13(30):8376-8388.
【3】KONDO J N, DOMEN K. Crystallization of mesoporous metal oxides[J]. Chemistry of Materials,2008,20(3):835-847.
【4】REN Y, MA Z, BRUCE P G. Ordered mesoporous metal oxides:Synthesis and applications[J]. Chemical Society Reviews, 2012, 41(14):4909-4927.
【5】MA Z, ZHOU B, REN Y. Crystalline mesoporous transition metal oxides:Hard-templating synthesis and application in environmental catalysis[J]. Frontiers of Environmental Science & Engineering, 2013,7(3):341-355.
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【7】FENG Q, KANOH H, OOI K. Manganese oxide porous crystals[J]. Journal of Materials Chemistry,1999,9(2):319-333.
【8】SUIB S L. Porous manganese oxide octahedral molecular sieves and octahedral layered materials[J]. Accounts of Chemical Research, 2008, 41(4):479-487.
【9】TIAN Z R, TONG W, WANG J Y, et al. Manganese oxide mesoporous structures:Mixed-valent semiconducting catalysts[J]. Science, 1997, 276(5314):926-930.
【10】REN Y, MA Z, MORRIS R E, et al. A solid with a hierarchical tetramodal micro-meso-macro pore size distribution[J]. Nature Communications, 2013, 4(3):2015.
【11】JOHNSON C S, DEES D W, MANSUETTO M F, et al. Structural and electrochemical studies of alpha-manganese dioxide (α-MnO2)[J]. Energy Storage,1996,68(2):570-577.
【12】KIM S H, KIM S J, OH S M. Preparation of layered MnO2 via thermal decomposition of KMnO4 and its electrochemical characterizations[J]. Chemistry of Materials, 1999, 11(3):557-563.
【13】KLEITZ F, CHOI S H, RYOO R. Cubic Ia3d large mesoporous silica:Synthesis and replication to platinum nanowires, carbon nanorods and carbon nanotubes[J]. Chemical Communications, 2003, 9(17):2136-2137.
【14】GOFF P L, BAFFIER N, BACH S, et al. Chemical lithium insertion into sol-gel lamellar manganese dioxide MnO1.85·nH2O[J].Journal of Materials Chemistry,1994,4(1):133-137.
【15】BOPPANA V B R, YUSUF S, HUTCHINGS G S, et al. Nanostructured alkaline-cation-containing δ-MnO2 for photocatalytic water oxidation[J]. Advanced Functional Materials, 2012, 23(7):878-884.
【16】JIAO F, BAO J L, HILL A H, et al. Synthesis of ordered mesoporous Li-Mn-O spinel as a positive electrode for rechargeable lithium batteries[J]. Angewandte Chemie, 2008, 120(50):9857-9862.
【17】REN Y, MA Z, BRUCE P G. Ordered mesoporous NiCoMnO4:Synthesis and application in energy storage and catalytic decomposition of N2O[J]. Journal of Materials Chemistry, 2012, 22(30):15121-15127.
【18】JIAO F, SHAJU K M, BRUCE P G. Synthesis of nanowire and mesoporous low-temperature LiCoO2 by a post-templating reaction[J]. Angewandte Chemie, 2005, 117(40):6708-6711.
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