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首页> 外文期刊>International Journal of Electrochemical Science >MnO2/CdS/N-doped Graphite Nanocomposite for High- Performance Supercapacitors
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MnO2/CdS/N-doped Graphite Nanocomposite for High- Performance Supercapacitors

机译：用于高性能超级电容器的MNO 2 / Cds / n掺杂石墨纳米复合材料

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摘要

To improve the electrochemical performance of supercapacitors, the reaction mechanism and structural design should be examined simultaneously. In this work, an N-doped graphite (NG) layer was self- assembled directly on a Ni matrix and acted as an active interlayer between the current collector and the active material. For the first time, ultrafine CdS nanoparticles were synthesized on an NG layer directly as the electrode active material. Subsequently, MnO2 nanowires penetrated the gaps between the CdS particles and tightly anchored the CdS nanoparticles on the surface of the NG. The presence of the MnO2 nanowires was demonstrated to prompt charge transfer into the interior CdS and facilitate the redox reaction at the MnO2-CdS@NG electrode. In addition, due to the synergy of the N-doped interlayer and the novel reinforced structure, the chemical activity and cycling stability were improved. From the electrochemical measurements, the specific capacitance of the MnO2-CdS@NG electrode -1 -1 was 1497 F g at the current density of 2 A g . In addition, the MnO2-CdS@NG//rGO asymmetric supercapacitor exhibited a superior energy density (33.8 W h kg-1 at a power density of 776 W kg-1) and a great cycling stability (87% at a current density of 10 A g-1 for 5000 cycles).
机译：为了提高超级电容器的电化学性能，应同时检查反应机理和结构设计。在这项工作中，将N掺杂的石墨（NG）层直接自组装在Ni矩阵上，并用作集电器和活性材料之间的有源层间。首次，将超细CDS纳米颗粒直接在Ng层上作为电极活性材料合成。随后，MNO2纳米线穿透Cds颗粒之间的间隙，并将Cds纳米颗粒紧密地锚定在NG的表面上。证明MnO2纳米线的存在以将电荷转移到内部Cds中并促进MnO2-CDS // Ng电极的氧化还原反应。另外，由于N掺杂层间和新颖的增强结构的协同作用，改善了化学活性和循环稳定性。从电化学测量，MnO2-CDS // Ng电极-1 -1的比电容为1497fg，电流密度为2ag。此外，MNO2-CDS // RGO不对称超级电容器表现出优异的能量密度（33.8WH kg-1，功率密度为776Wk-1的功率密度），循环稳定性（以电流密度为87％） 10 a g-1 5000个循环）。

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