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Preparation of Single-Atom Ag-Decorated MnO2 Hollow Microspheres by Redox Etching Method for High-Performance Solid-State Asymmetric Supercapacitors
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-09-07 , DOI: 10.1021/acsaem.0c01969 Hong Yi 1 , Aimei Gao 1, 2 , Xikun Pang 1 , Zhuoran Ao 1 , Dong Shu 1, 2 , Shengxiang Deng 1 , Fenyun Yi 1, 2 , Chun He 3 , Xiaoping Zhou 1 , Zhenhua Zhu 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-09-07 , DOI: 10.1021/acsaem.0c01969 Hong Yi 1 , Aimei Gao 1, 2 , Xikun Pang 1 , Zhuoran Ao 1 , Dong Shu 1, 2 , Shengxiang Deng 1 , Fenyun Yi 1, 2 , Chun He 3 , Xiaoping Zhou 1 , Zhenhua Zhu 1
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Single-atom Ag-decorated MnO2 hollow microspheres (Ag-MnO2 HMSs) with oxygen vacancies are successfully fabricated via a self-template strategy and redox etching method. The transmission electron microscopy images and nitrogen-sorption analyses reveal that the as-prepared Ag-MnO2 HMSs exhibit a porous peanut-like hollow structure with a large specific surface area (∼240 m2 g–1). High-angle annular dark-field scanning transmission electron microscopy confirms that Ag species exist as isolated single atomic sites. The electrochemical experiments show that the 0.3% Ag-MnO2 HMS electrode delivers high specific capacitance (297.5 F g–1 at 0.3 A g–1), 66.3% higher than that of MnO2 HMSs (178.9 F g–1 at 0.3 A g–1), and excellent cycling stability (88.1% capacitance retention after 9000 cycles). Moreover, the assembled Ag-MnO2 HMSs//AC solid-state asymmetric supercapacitor achieves a high operation voltage of 2.0 V and exhibits a high energy density of 15.9 W h kg–1 at a power density of 250.3 W kg–1. Besides, the device can successfully light up a light-emitting diode. The experimental results demonstrate that an appropriate amount of single-atom Ag in MnO2 HMSs promotes the formation of oxygen vacancies, which can improve the conductivity of MnO2 HMSs and the charge storage at Mn and O sites, thereby improving the capacitance performance of MnO2 HMSs.
中文翻译：
氧化还原刻蚀法制备单原子Ag修饰的MnO 2空心微球用于高性能固态不对称超级电容器
通过自模板策略和氧化还原刻蚀法成功地制备了具有氧空位的单原子Ag修饰的MnO 2空心微球（Ag-MnO 2 HMSs）。透射电子显微镜图像和氮吸附分析表明，所制备的Ag-MnO 2 HMS表现出具有大比表面积（〜240 m 2 g –1）的多孔花生状中空结构。高角度环形暗场扫描透射电子显微镜证实，Ag物种作为孤立的单个原子位点存在。电化学实验表明，0.3％的Ag-MnO的2个HMS电极提供高的比电容（297.5 F G -1 0.3 A G -1），比MnO 2 HMS（在0.3 A g –1时为178.9 F g –1）高66.3％，并具有出色的循环稳定性（9000次循环后的电容保持率为88.1％）。此外，组装的Ag-MnO 2 HMSs // AC固态不对称超级电容器可实现2.0 V的高工作电压，并在250.3 W kg –1的功率密度下表现出15.9 W h kg –1的高能量密度。此外，该装置可以成功点亮发光二极管。实验结果表明，适量的MnO 2 HMSs中单原子Ag可以促进氧空位的形成，从而可以提高MnO 2的电导率。HMS和Mn和O位置的电荷存储，从而提高MnO 2 HMS的电容性能。
更新日期：2020-10-26
中文翻译：
氧化还原刻蚀法制备单原子Ag修饰的MnO 2空心微球用于高性能固态不对称超级电容器
通过自模板策略和氧化还原刻蚀法成功地制备了具有氧空位的单原子Ag修饰的MnO 2空心微球（Ag-MnO 2 HMSs）。透射电子显微镜图像和氮吸附分析表明，所制备的Ag-MnO 2 HMS表现出具有大比表面积（〜240 m 2 g –1）的多孔花生状中空结构。高角度环形暗场扫描透射电子显微镜证实，Ag物种作为孤立的单个原子位点存在。电化学实验表明，0.3％的Ag-MnO的2个HMS电极提供高的比电容（297.5 F G -1 0.3 A G -1），比MnO 2 HMS（在0.3 A g –1时为178.9 F g –1）高66.3％，并具有出色的循环稳定性（9000次循环后的电容保持率为88.1％）。此外，组装的Ag-MnO 2 HMSs // AC固态不对称超级电容器可实现2.0 V的高工作电压，并在250.3 W kg –1的功率密度下表现出15.9 W h kg –1的高能量密度。此外，该装置可以成功点亮发光二极管。实验结果表明，适量的MnO 2 HMSs中单原子Ag可以促进氧空位的形成，从而可以提高MnO 2的电导率。HMS和Mn和O位置的电荷存储，从而提高MnO 2 HMS的电容性能。
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