Metal-free polypeptide redox flow batteries
Metal-free polypeptide redox flow batteries
复制标题
无金属多肽氧化还原液流电池
DOI：
10.1039/d2ma00498d
复制
发表时间：
2022
影响因子：
5
通讯作者：
Odom, Susan A.
中科院分区：
文献类型：
--
作者：
Liang, Zhiming;Nguyen, Tan P.;Attanayake, N. Harsha;Easley, Alexandra D.;Lutkenhaus, Jodie L.;Wooley, Karen L.;Odom, Susan A.
非水有机氧化还原液流电池(NAORFB)因其较大的电压窗口和不含金属的特性而被认为是新兴的大规模储能系统。然而，氧化还原材料的低溶解性、可持续性和交叉性仍然是NAORFB发展的主要挑战。在这里，我们报告了适用于NAORFB的氧化还原活性α螺旋多肽的使用。对于Daramic 175分离器和FAPQ 375 PP膜，多肽表现出比小分子类似物更少的交叉，其中FAPQ 375 PP防止交叉最有效。以TEMPO为基础的多肽阴极体和紫精为基础的多肽阳极体组装的多肽NAORFB具有低容量衰退(在500个循环中每循环约0.1%)和高库仑效率(>；99.5%)。多肽NAORFB的输出电压为1.1V，最大容量为0.53A h L−1(理论容量的39%)。在500次充放电循环后，初始容量保持了60%。用光谱和电化学方法进行的后循环分析表明，在电化学循环过程中，多肽主链和酯侧链键是稳定的。综上所述，这些多肽提供了自然衍生的、可解构的平台，以满足无金属能量存储的需求。
Non-aqueous organic redox flow batteries (NAORFBs) are considered emerging large-scale energy storage systems due to their larger voltage window as compared to aqueous systems and their metal-free nature. However, low solubility, sustainability, and crossover of redox materials remain major challenges for the development of NAORFBs. Here, we report the use of redox active α-helical polypeptides suitable for NAORFBs. The polypeptides exhibit less crossover than small molecule analogs for both Daramic 175 separator and FAPQ 375 PP membrane, with FAPQ 375 PP preventing crossover most effectivley. Polypeptide NAORFBs assembled with a TEMPO-based polypeptide catholyte and viologen-based polypeptide anolyte exhibit low capacity fade (ca. 0.1% per cycle over 500 cycles) and high coulombic efficiency (>99.5%). The polypeptide NAORFBs exhibit an output voltage of 1.1 V with a maximum capacity of 0.53 A h L−1 (39% of the theoretical capacity). After 500 charge–discharge cycles, 60% of the initial capacity was retained. Post cycling analysis using spectral and electrochemical methods demonstrate that the polypeptide backbone and the ester side chain linkages are stable during electrochemical cycling. Taken together, these polypeptides offer naturally-derived, deconstructable platforms for addressing the needs of metal-free energy storage.