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Construction of 2D–2D Plate-on-Sheet Cobalt Sulfide–Reduced Graphene Oxide Nanocomposites for Enhanced Energy Storage Properties in Supercapacitors
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-12-24 , DOI: 10.1021/acsaem.0c01902 Boyang Hu 1 , Hougui Li 1 , Aifeng Liu 1 , Congmei Yue 1 , Zengcai Guo 1 , Jingbo Mu 1 , Xiaoliang Zhang 1 , Hongwei Che 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2020-12-24 , DOI: 10.1021/acsaem.0c01902 Boyang Hu 1 , Hougui Li 1 , Aifeng Liu 1 , Congmei Yue 1 , Zengcai Guo 1 , Jingbo Mu 1 , Xiaoliang Zhang 1 , Hongwei Che 1
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Cobalt sulfides, as a class of promising electrode materials for supercapacitors, are still limited by an unsatisfactory rate capability and cyclic instability, which are caused by their easy agglomeration and large volume changes during repeated charge–discharge processes. Herein, two-dimensional (2D)–2D plate-on-sheet CoS2-reduced graphene oxide (rGO) nanocomposites were constructed by a facile solvothermal reaction followed by heat treatment. In such heterostructured nanocomposites, interconnected rGO nanosheets as supports are revealed to disperse CoS2 nanoplates well on the surface, providing many electroactive sites. More importantly, the face-to-face contact via the C–O–Co bonds creates a highly coupled interface, which not only efficiently promotes interface charge transfer but also increases the mechanical strength to accommodate volume variation. As a result, the synthesized CoS2-rGO nanocomposites exhibit specific capacitances of up to 1417 (1119) F g–1 at 2 (20) A g–1, together with 92% capacitance retention after 5000 cycles at 10 A g–1. Furthermore, the charge storage behavior of CoS2-rGO nanocomposites is investigated by ex situ characterization techniques. Our findings not only further the understanding of the energy storage mechanism of 2D–2D heterostructured CoS2-rGO nanocomposites but may also be extended to the rational design of other high-performance metal sulfide-based nanocomposite electrodes.
中文翻译：
2D–2D板载硫化钴还原石墨烯氧化物纳米复合材料的构建，可提高超级电容器的储能性能
硫化钴作为超级电容器的一种有前景的电极材料，仍然受速率能力和循环不稳定性的限制，这是由于它们易于团聚和在反复的充放电过程中体积变化大而引起的。在这里，二维（2D）– 2D平板上CoS 2还原的氧化石墨烯（rGO）纳米复合材料是通过简单的溶剂热反应然后进行热处理而构建的。在这种异质结构的纳米复合材料中，互连的rGO纳米片作为载体被发现可以分散CoS 2纳米板表面良好，提供许多电活性位点。更重要的是，通过C–O–Co键进行的面对面接触可形成高度耦合的界面，这不仅有效地促进了界面电荷的转移，而且提高了机械强度以适应体积变化。结果，合成的CoS 2 -rGO纳米复合材料在2（20）A g –1下显示出高达1417（1119）F g –1的比电容，在10 A g –1下进行5000次循环后的电容保持率达到92％。此外，COS的电荷存储行为2 -rGO纳米复合材料是通过调查易地表征技术。我们的发现不仅可以进一步理解2D–2D异质结构CoS 2 -rGO纳米复合材料的储能机理，还可以扩展到其他高性能基于金属硫化物的纳米复合电极的合理设计。
更新日期：2021-01-25
中文翻译：
2D–2D板载硫化钴还原石墨烯氧化物纳米复合材料的构建，可提高超级电容器的储能性能
硫化钴作为超级电容器的一种有前景的电极材料，仍然受速率能力和循环不稳定性的限制，这是由于它们易于团聚和在反复的充放电过程中体积变化大而引起的。在这里，二维（2D）– 2D平板上CoS 2还原的氧化石墨烯（rGO）纳米复合材料是通过简单的溶剂热反应然后进行热处理而构建的。在这种异质结构的纳米复合材料中，互连的rGO纳米片作为载体被发现可以分散CoS 2纳米板表面良好，提供许多电活性位点。更重要的是，通过C–O–Co键进行的面对面接触可形成高度耦合的界面，这不仅有效地促进了界面电荷的转移，而且提高了机械强度以适应体积变化。结果，合成的CoS 2 -rGO纳米复合材料在2（20）A g –1下显示出高达1417（1119）F g –1的比电容，在10 A g –1下进行5000次循环后的电容保持率达到92％。此外，COS的电荷存储行为2 -rGO纳米复合材料是通过调查易地表征技术。我们的发现不仅可以进一步理解2D–2D异质结构CoS 2 -rGO纳米复合材料的储能机理，还可以扩展到其他高性能基于金属硫化物的纳米复合电极的合理设计。
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