混合还原氧化石墨烯/二硒化锰立方体：一种用于超级电容器的新型电极材料,Energy Technology

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混合还原氧化石墨烯/二硒化锰立方体：一种用于超级电容器的新型电极材料
Energy Technology ( IF 3.6 ) Pub Date : 2017-07-05 , DOI: 10.1002/ente.201700097
B. Balamuralitharan ₁ , S. N. Karthick _{1,

2} , Suresh Kannan Balasingam _{3,

4,

5} , K. V. Hemalatha ₆ , Samayanan Selvam ₁ , J. Anandha Raj ₇ , Kandasamy Prabakar ₁ , Yongseok Jun ₅ , Hee-Je Kim ₁

Affiliation

二维石墨烯纳米片和层状过渡金属二卤化碳的集成已被认为是合成用于储能器件的有希望的电极材料的最广泛的策略之一。在这项研究中，立方二硒化锰（MnSe ₂）和杂化还原氧化石墨烯/ MnSe ₂（G-MnSe ₂）材料是通过一种简便的水热法合成的。在该方法中，金属硒杂质被认为是主要的有害副产物。去除此类块状硫族化物的有效方法是关键挑战。对于G-MnSe ₂杂化材料的合成，我们采用了将氧化石墨烯与锰和硒前体混合的策略。令人惊讶的是，最终的G-MnSe_2种产品中硒杂质的量可忽略不计。对MnSe ₂和G‐MnSe ₂杂化材料进行了详细表征。首次针对超级电容器应用评估了MnSe ₂基材料的电化学储能性能。MnSe ₂电极的比电容约为57.8 mF cm ^-2，而混合G-MnSe ₂电极在1 mV s ^-1的扫描速率下显示出更高的比电容93.3 mF cm ^-2。由G-MnSe ₂制成的对称电池混合材料在4500个循环中表现出出色的长期稳定性，其初始电容的保留率约为106％，与基于MnSe ₂的对称电池的循环寿命（在第4500个循环中保持80％的电容）相比，这是令人印象深刻的。

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Hybrid Reduced Graphene Oxide/Manganese Diselenide Cubes: A New Electrode Material for Supercapacitors

The integration of 2 D graphene nanosheets and layered transition‐metal dichalcogenides has been recognized as one of the most extensive strategies for the synthesis of promising electrode materials for energy‐storage devices. In this study, cubic manganese diselenide (MnSe₂) and hybrid reduced graphene oxide/MnSe₂ (G‐MnSe₂) materials were synthesized by a facile hydrothermal method. Metallic selenium impurities are considered to be a major unwanted byproduct in this method. An effective means to remove such bulk chalcogenides is a key challenge. For the synthesis of the G‐MnSe₂ hybrid material, we used a strategy in which the graphene oxide was mixed with manganese and selenium precursors. Surprisingly, the final G‐MnSe₂ product contained a negligible amount of selenium impurity. The MnSe₂ and G‐MnSe₂ hybrid materials were characterized in detail. For the first time, the electrochemical energy‐storage behavior of MnSe₂‐based materials was assessed for supercapacitor applications. The specific capacitance of the MnSe₂ electrode was approximately 57.8 mF cm⁻², whereas the hybrid G‐MnSe₂ electrode showed a much higher specific capacitance of 93.3 mF cm⁻² at a scan rate of 1 mV s⁻¹. A symmetric cell made from the G‐MnSe₂ hybrid material showed excellent long‐term stability for 4500 cycles and approximately 106 % retention of its initial capacitance, which is impressive compared with the cycle life of the MnSe₂‐based symmetric cell (80 % capacitance retention at the 4500th cycle).

更新日期：2017-07-05

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