<i>α</i>-MnO<sub>2</sub>纳米管自组装微球的可控制备及电化学性能

引用本文: 鞠广凯, 陶占良, 陈军. α-MnO₂纳米管自组装微球的可控制备及电化学性能[J]. 物理化学学报, 2017, 33(7): 1421-1428. doi: 10.3866/PKU.WHXB201704077 shu

Citation: JU Guang-Kai, TAO Zhan-Liang, CHEN Jun. Controllable Preparation and Electrochemical Performance of Self-assembled Microspheres of α-MnO₂ Nanotubes[J]. Acta Physico-Chimica Sinica, 2017, 33(7): 1421-1428. doi: 10.3866/PKU.WHXB201704077 shu

α-MnO₂纳米管自组装微球的可控制备及电化学性能

南开大学化学学院, 天津 300071
基金项目:
国家重点研发计划（2016YFB0901502）和国家自然科学基金（21231005，51371100）资助项目

摘要: 以KMnO₄、HCl为反应物，H₂SO₄、NH₄Cl为助剂，利用水热法成功合成了α-MnO₂纳米管自组装微球。并采用X射线晶体衍射（XRD）、场发射扫描电子显微镜（SEM）、透射电子显微镜（TEM）以及X射线光电子能谱（XPS）表征手段对产物进行了形貌和结构表征，发现H⁺与Cl^-离子浓度对产物的晶型有很大影响：单一增加H⁺或Cl^-离子浓度可以使纳米管管径减小、长度增加；同时增加两种离子浓度则产物从α相转化为β相；NH₄⁺可以起到维持产物晶型（α相）以及管状形貌的作用。电化学性能测试表明，具有独特形态的α-MnO₂纳米管微球作为锂电负极具有高容量（20 mA·g^-1电流密度下首周放电比容量达1783.5 mAh·g^-1）与良好的倍率性能，是具有广阔应用前景的锂离子电池材料。

关键词:

English

Controllable Preparation and Electrochemical Performance of Self-assembled Microspheres of α-MnO₂ Nanotubes

College of Chemistry, Nankai University, Tianjin 300071, China
Received Date: 01 March 2017
Revised Date: 24 March 2017
Available Online: 07 April 2017
Fund Project:
The project was supported by the National Key R&D Program of China (2016YFB0901502) and the National Natural Science Foundation of China (21231005, 51371100)

Abstract: Self-assembled microspheres of α-MnO₂ nanotubes were successfully synthesized by hydrothermal method using KMnO₄ and HCl as reactants, and H₂SO₄ and NH₄Cl as auxiliaries. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) were used to characterize the structure and morphology of the products. The H⁺ and Cl^- ion concentrations substantially influence the crystal form of the product. Increasing either H⁺ or Cl^- ion concentration decreases the diameter of nanotubes but increases their length. In contrast, increasing both H⁺ and Cl^- ion concentrations, changes the product from α phase to β phase. Moreover, NH₄⁺ ion plays the key role of maintaining the product crystal and its tubular morphology. The electrochemical performance results showed that the microspheres of α-MnO₂ nanotubes with a unique morphology have a high first cycle discharge capacity of 1783.5 mAh·g^-1 at the current density of 20 mA·g^-1, along with a good rate performance. This suggests that the self-assembled microspheres were a promising material for lithium-ion batteries.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

α-MnO₂纳米管自组装微球的可控制备及电化学性能

English

Controllable Preparation and Electrochemical Performance of Self-assembled Microspheres of α-MnO₂ Nanotubes

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

α-MnO2纳米管自组装微球的可控制备及电化学性能

English

Controllable Preparation and Electrochemical Performance of Self-assembled Microspheres of α-MnO2 Nanotubes

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

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CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

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CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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通讯作者: 陈斌, bchen63@163.com

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Controllable Preparation and Electrochemical Performance of Self-assembled Microspheres of α-MnO₂ Nanotubes

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