阴极
化学
溶解
电极
碳纤维
电池(电)
氧化还原
电化学
微量
化学工程
水溶液
无机化学
分析化学(期刊)
有机化学
物理化学
复合材料
材料科学
复合数
医学
功率(物理)
物理
替代医学
量子力学
病理
工程类
作者
Xin Huang,Xue Qiu,Sheng Wang,Junjie Li,Zhi Liu,Xia Yu,Jing Ma,Yangang Wang
摘要
Organic electrode materials have gained attention for their tunable structures and sustainability, but their low electronic conductivity requires the use of large amounts of carbon additives (30 wt %) and low mass loadings (<2 mg cm-2) in electrodes. Here, we synthesize dibenzo[b,i]phenazine-5,7,12,14-tetrone (DPT) as a cathode active material for an aqueous Zn battery and find that Zn2+ storage dominates the cathode reaction. This battery demonstrates high capacity (367 mAh g-1), high-rate performance, and superlong life (12000 cycles). Remarkably, despite DPT's insulative nature, even with a high mass loading (10 mg cm-2) and only 10 wt % carbon additives, the DPT-based cathode exhibits promising performance due to trace dissolved discharge product (DPTx-). During discharge, the DPT is reduced to trace amounts of dissolved DPTx- at the cathode surface, which in turn reduces the remaining solid DPT as a redox mediator. Furthermore, dissolution-redeposition results in the reduction of DPT size and the formation of pores, further activating the electrode.
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