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A new hexacyanoferrate nanosheet array converted from copper oxide as a high-performance binder-free energy storage electrode
Electrochimica Acta ( IF 6.6 ) Pub Date : 2018-10-17 , DOI: 10.1016/j.electacta.2018.10.056
Hua Yao , Feng Zhang , Gaowei Zhang , Yangyi Yang

Coordination Supramolecular Networks (CSNs) is attracting more and more attention in the energy storage field because of its numerous merits such as dynamic structural reversibility and porosity. In this work, a binder-free electrode of CSN (copper hexacyanoferrate, CuHCF) nanosheet array on carbon cloth ([email protected]) has been fabricated by in-situ conversion strategy. The initial CuO nanosheets can be converted to CuHCF hierarchical structure by competitive coordination reactions between the [Fe(CN)6]−3 and 1,3,5-Benzenetricarboxylic acid (H3BTC). Benefitting from the good dynamic structural reversibility of CSNs, large ionic channels in the CuHCF lattice and hierarchical structure of [email protected], the electrode delivers a high areal capacitance/capacity of 1441.4 mF cm−2/1441.4 mC cm−2, superior rate capability (∼75% of its initial capacitance/capacity when the current densities increased from 2 to 30 mA cm−2) and good cycling performance (∼87% retention after 2000 cycles at 30 mA cm−2). An asymmetric supercapacitor assembled with [email protected] as positive electrode and activated carbon as negative electrode ([email protected]//AC) exhibits a high energy density of 78.8 μW h cm−2, further demonstrating its application potential. This nanosheet's strategy may provide a guideline for fabricating high active electrodes of energy storage from traditional bulk coordination supramolecular networks.



中文翻译:

由氧化铜转变为高性能的无氰储能电极的新型六氰基高铁酸盐纳米片阵列

协调超分子网络(CSN)由于其动态结构可逆性和孔隙率等诸多优点而在储能领域受到越来越多的关注。在这项工作中,通过原位转换策略在碳布([受电子邮件保护])上制造了CSN(六氰合铁酸铜,CuHCF)纳米片阵列的无粘合剂电极。初始的CuO纳米片可以通过[Fe(CN)6 ] -3与1,3,5-苯三羧酸(H 3BTC)。得益于CSN的良好动态结构可逆性,CuHCF晶格中的大离子通道和[电子邮件保护]的分层结构,该电极可提供1441.4 mF cm -2 /1441.4 mC cm -2的高面积电容/容量,出众的速率容量(当电流密度从2增大到30 mA cm -2时约为其初始电容/容量的75%)和良好的循环性能(在30 mA cm -2的2000个循环后保持约87%)。以[email protected]作为正极和活性炭作为负极([email protected] // AC)组装的不对称超级电容器具有78.8μWh cm -2的高能量密度,进一步证明了其应用潜力。该纳米片的策略可以为从传统的本体配位超分子网络制造储能的高活性电极提供指导。

更新日期:2018-10-17
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