Emerging grid storage needs are motivating the discovery and development of new, potentially inexpensive redox couples for use in flow batteries. Long-term stability in electrochemical environments remains a key challenge and charge/discharge cycling in a bulk electrolysis cell is a common initial approach. However, as cycling protocols are not yet standardized, comparison between different materials is difficult. Here, using a well-studied, substituted dialkoxybenzene as a model compound, we examine the impact of cycling conditions on perceived stability. Specifically, we show that cycle time is a better measure of stability than cycle number and, for materials that are unstable in their charged state, the fractional capacity accessed is inversely related to cycle time to failure.

新兴的网格存储需求正在推动发现和开发用于液流电池的新型，潜在廉价的氧化还原电对。在电化学环境中的长期稳定性仍然是关键的挑战，在大容量电解槽中的充电/放电循环是一种常见的初始方法。但是，由于自行车协议尚未标准化，因此很难在不同材料之间进行比较。在这里，使用经过充分研究的取代的二烷氧基苯作为模型化合物，我们研究了骑行条件对感知稳定性的影响。具体而言，我们表明循环时间比循环次数是更好的稳定性度量，并且对于在充电状态下不稳定的材料，所获得的分数容量与故障循环时间成反比。