The impact of morphologies and electrolyte solutions on the supercapacitive behavior for Fe2O3 and the charge storage mechanism
The impact of morphologies and electrolyte solutions on the supercapacitive behavior for Fe2O3 and the charge storage mechanism
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DOI：
10.1016/j.electacta.2015.08.013
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发表时间：
2015-10-01
影响因子：
6.6
通讯作者：
Zhang, Yunhuai
中科院分区：
文献类型：
--
作者：
Li, Yanhong;Li, Qi;Zhang, Yunhuai
先前的工作表明Fe2O3是一种有前途的负极材料。其生化性能受形态的强烈影响。因此，通过水热法分别合成了纳米颗粒、纳米片和纳米棒形貌的Fe2O3。研究了形态与电化学性能之间的关系，特别是比电容和倍率性能方面。详细的循环伏安分析表明，表面电容和内部嵌入电容的相对贡献随形貌的变化而变化。表面相对于内部电荷存储的不同贡献导致不同的比电容和倍率能力。此外，由于内部插层效应，Fe2O3纳米片在5 mV s(-1)的扫描速率下提供了279.9 F g(-1) (419.8 mF cm(-2))的显着比电容。此外，中性和碱性溶液中的电化学测试表明，Fe2O3的电容行为与电位窗口密切相关，不同的电解质导致表面相对于内部电荷存储的贡献不同。这些研究有助于阐明 Fe2O3 基电极电荷存储的机制和形态效应，并为提高其电容提供方向。 (C) 2015 Elsevier Ltd. 保留所有权利。
Previous work demonstrates that Fe2O3 is a promising negative electrode material. Its biochemical performance is strongly influenced by the morphology. Hence, Fe2O3 with nanoparticles, nanosheets and nanorods morphologies are synthesized by hydrothermal method respectively. The relationship between morphology and electrochemical property, particularly in terms of specific capacitance and rate capability are investigated. Detail cyclic voltammetry analysis reveals that the relative contributions of surface capacitive and inner intercalation capacitance change with the morphology. Different contribution of surface relative to inner charge storage leads to different specific capacitance and rate capability. Additionally, Fe2O3 nanosheets delivers a remarkable specific capacitance of 279.9 F g(-1) (419.8 mF cm(-2)) at the scan rate of 5 mV s(-1) ascribing to the inner intercalation effect. Moreover, electrochemical tests in neutral and alkaline solution show that the capacitive behavior of Fe2O3 is closely related to the potential window and different electrolyte leads to different contribution of surface relative to inner charge storage. These studies should be useful for elucidating the mechanism and morphological effects on charge storage for Fe2O3-based electrode and provide a direction to enhance its capacitance. (C) 2015 Elsevier Ltd. All rights reserved.