Multi-redox Molecule for High-Energy Redox Flow Batteries
Multi-redox Molecule for High-Energy Redox Flow Batteries
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DOI：
10.1016/j.joule.2018.0.5.014
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发表时间：
2018-09-19
期刊：
影响因子：
39.8
通讯作者：
Kang, Kisuk
中科院分区：
文献类型：
--
作者：
Kwon, Giyun;Lee, Sechan;Kang, Kisuk
氧化还原液流电池(RFB)由于其设计的灵活性是最有前途的储能系统之一，但其低能量密度是限制其广泛应用的主要缺点。提高能量密度的大多数传统方法都涉及到利用高浓度电解液。然而，这种方法导致了许多技术问题，如动力学迟缓。我们提出了一种通过开发多氧化还原吩嗪分子(5，10-二氢-5，10-二甲基吩嗪[DMPZ])来提高能量密度的策略。DMPZ在-0.15和0.61V表现出对Ag/Ag+的双重氧化还原活性，具有显著的动力学和化学稳定性。与9-荧光酮(FL)相结合，DMPZ/FL流动池可提供迄今报道的RFB最高的每摩尔能量密度85W小时摩尔(-1)。此外，DMPZ的显著颜色变化使电荷状态得以精确可视化。这种多氧化还原材料的新策略可以为高能量密度RFB提供一条潜在的途径。
Redox flow batteries (RFBs) are some of the most promising energy storage systems because of their design flexibility; however, their low energy density is a major drawback limiting widespread application. Most conventional approaches to increase the energy density have involved exploiting high-concentration electrolytes. However, this approach results in many technical issues, such as sluggish kinetics. We propose a strategy of boosting the energy density by exploiting a multi-redox phenazine molecule (5,10-dihydro-5,10-dimethyl phenazine [DMPZ]). DMPZ exhibits double-redox activity at -0.15 and 0.61 V versus Ag/Ag+ with remarkable kinetics and chemical stability. Coupled with 9-fluorenone (FL), the DMPZ/FL flow cell can provide the highest energy density per mole 85 W hr mol(-1)) ever reported for RFBs. Furthermore, the marked color change of DMPZ enables the state of charge to be precisely visualized. This novel strategy for a multi-redox material can provide a potential pathway toward high-energy-density RFBs.