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A Hybrid Mineral Battery: Energy Storage and Dissolution Behavior of CuFeS2 in a Fixed Bed Flow Cell
ChemSusChem ( IF 7.5 ) Pub Date : 2018-04-18 , DOI: 10.1002/cssc.201800157 Kashif Mairaj Deen 1 , Edouard Asselin 1
ChemSusChem ( IF 7.5 ) Pub Date : 2018-04-18 , DOI: 10.1002/cssc.201800157 Kashif Mairaj Deen 1 , Edouard Asselin 1
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The development of a hybrid system capable of storing energy and the additional benefit of Cu extraction is discussed in this work. A fixed bed flow cell (FBFC) was used in which a composite negative electrode containing CuFeS2 (80 wt %) and carbon black (20 wt %) in graphite felt was separated from a positive (graphite felt) electrode by a proton‐exchange membrane. The anolyte (0.2 m H2SO4) and catholyte (0.5 m Fe2+ in 0.2 m H2SO4 with or without 0.1 m Cu2+) were circulated in the cell. The electrochemical activity of the Fe2+/Fe3+ redox couple over graphite felt significantly improved after the addition of Cu2+ in the catholyte. Ultimately, in the CuFeS2∥Fe2+/Cu2+ (CFeCu) FBFC system, the specific capacity increased continuously to 26.4 mAh g−1 in 500 galvanostatic charge–discharge (GCD) cycles, compared to the CuFeS2∥Fe2+ (CFe) system (13.9 mAh g−1). Interestingly, the specific discharge energy gradually increased to 3.6 Wh kg−1 in 500 GCD cycles for the CFeCu system compared to 3.29 Wh kg−1 for the CFe system in 150 cycles. In addition to energy storage, 10.75 % Cu was also extracted from the mineral, which is an important feature of the CFeCu system as it would allow Cu extraction and recovery through hydrometallurgical methods.
中文翻译：
混合矿物电池：固定床流通池中CuFeS2的储能和溶解行为
在这项工作中讨论了能够存储能量和提取铜的其他好处的混合系统的开发。使用固定床流通池（FBFC），其中通过质子交换将包含石墨毡中的CuFeS 2（80 wt％）和炭黑（20 wt％）的复合负极与正极（石墨毡）分开膜。将阳极电解液（0.2 m H 2 SO 4）和阴极电解液（0.5 m Fe 2+在0.2 m H 2 SO 4中的有或无0.1 m Cu 2+的溶液中）循环。Fe 2+的电化学活性在阴极电解液中添加Cu 2+后，石墨上的/ Fe 3+氧化还原对明显改善。最终，在CuFeS 2 ∥Fe 2+ / Cu的2+（CFeCu）FBFC系统中，比容量不断增加至26.4毫安克-1在500恒电流充放电（GCD）周期，相比于CuFeS 2 ∥Fe 2 +（CFe）系统（13.9 mAh g -1）。有趣的是，该特定放电能量逐渐增加至3.6瓦时千克-1在500次循环GCD为CFeCu系统相比3.29瓦千克-1用于CFe系统的150个循环。除了储能外，还从矿物中提取了10.75％的Cu，这是CFeCu系统的重要特征，因为它将允许通过湿法冶金法提取和回收Cu。
更新日期：2018-04-18
中文翻译：
混合矿物电池：固定床流通池中CuFeS2的储能和溶解行为
在这项工作中讨论了能够存储能量和提取铜的其他好处的混合系统的开发。使用固定床流通池（FBFC），其中通过质子交换将包含石墨毡中的CuFeS 2（80 wt％）和炭黑（20 wt％）的复合负极与正极（石墨毡）分开膜。将阳极电解液（0.2 m H 2 SO 4）和阴极电解液（0.5 m Fe 2+在0.2 m H 2 SO 4中的有或无0.1 m Cu 2+的溶液中）循环。Fe 2+的电化学活性在阴极电解液中添加Cu 2+后，石墨上的/ Fe 3+氧化还原对明显改善。最终，在CuFeS 2 ∥Fe 2+ / Cu的2+（CFeCu）FBFC系统中，比容量不断增加至26.4毫安克-1在500恒电流充放电（GCD）周期，相比于CuFeS 2 ∥Fe 2 +（CFe）系统（13.9 mAh g -1）。有趣的是，该特定放电能量逐渐增加至3.6瓦时千克-1在500次循环GCD为CFeCu系统相比3.29瓦千克-1用于CFe系统的150个循环。除了储能外，还从矿物中提取了10.75％的Cu，这是CFeCu系统的重要特征，因为它将允许通过湿法冶金法提取和回收Cu。
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