Electrochemical characterization of polypyridine iron(II) and cobalt(II) complexes for organic redox flow batteries
Electrochemical characterization of polypyridine iron(II) and cobalt(II) complexes for organic redox flow batteries
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用于有机氧化还原液流电池的聚吡啶铁(II)和钴(II)配合物的电化学表征
DOI：
10.1016/j.poly.2017.12.001
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发表时间：
2017
期刊：
影响因子：
2.6
通讯作者：
C. Bignozzi
中科院分区：
文献类型：
--
作者：
E. Benazzi;Vito Cristino;Stefano Caramori;L. Meda;Rita Boaretto;C. Bignozzi
探索了一系列基于螯合配体的配合物的电化学性质，目的是寻找在高压有机流通池中应用的有希望的候选物。 Co(II)/(I) 和 Fe(III)/(II) 的组合作为阴极和阳极电偶，在碳酸乙烯酯和碳酸丙烯酯的混合物中，在 0.3M 浓度下，开路电压接近 2V，电流限制为 30mA/cm2 量级。发现三氟甲磺酸 (OTf) 盐形式的双阳离子复合物的最佳溶解度，在室温下达到 >0.6M。恒电位和动电位实验也表明碳基电极具有显着的化学和电化学稳定性。
The electrochemical properties of a series of complexes based on chelate ligands were explored with the aim of finding promising candidates for applications in high voltage organic flow cells. The combination of Co(II)/(I) and Fe(III)/(II) as the cathodic and the anodic couple leads to open circuit voltages close to 2 V and to limiting current of the order of 30 mA/cm2in 0.3 M concentration in a mixture of Ethylene and Propylene carbonates. The best solubility was found for bis-cationic complexes as triflate (OTf) salts, reaching >0.6 M at room temperature. Potentiostatic and potentiodynamic experiments point to a substantial chemical and electrochemical stability at carbon based electrodes as well.