Measuring the alkaline stability of anion-exchange membranes
Measuring the alkaline stability of anion-exchange membranes
复制标题
DOI：
10.1016/j.jelechem.2022.116112
复制
发表时间：
2022-02-10
影响因子：
4.5
通讯作者：
Dekel, Dario R.
中科院分区：
文献类型：
--
作者：
Haj-Bsoul, Saja;Varcoe, John R.;Dekel, Dario R.
在开发用于无液体电解质燃料电池（AEMFC）和水电解槽（AEMWE）的耐用、坚固的阴离子交换膜（AEM）中的一个显著障碍是它们对碱的有限的化学稳定性。为了测量AEM的碱性稳定性，通常使用非原位测试，其中AEM在碱性水溶液中浸泡长时间。然而，这样的测试不能充分模拟AEMFC和AEMWE的无液体电解质的环境，因为水合和碱性条件并不总是模拟实际的操作条件，对于相对较低的水合条件，产生误导和不准确的降解速率指示。我们最近报道了一种独特的非原位方法，该方法在模拟原位操作环境的条件下测定AEM的碱性稳定性。在这项研究中，我们应用这种技术来确定几个AEM含有不同的官能团和主链化学的碱性稳定性。含有不同官能团化学的基于HDPE的辐射接枝（RG）-AEM的碱稳定性遵循以下趋势：TMA >= MPY，类似于MPIP平方DEMA > TEA。含有不同主链和相同稳定TMA基团的辐射接枝的AEM（和非辐射接枝的PPO基准）遵循稳定性顺序：ETFE >= LDPE > HDPE正方形PPO。该技术被推荐用于AEMFC和AEMWE应用的AEM的碱稳定性的非原位测试。
One significant barrier in developing durable, robust anion-exchange membranes (AEMs) for liquid-electrolyte-free fuel cells (AEMFCs) and water electrolyzers (AEMWEs) is their limited chemical stability to alkali. To measure the alkaline stability of AEMs, ex-situ tests are commonly used where the AEMs are immersed for long durations in aqueous alkali solutions. However, such tests do not adequately simulate the liquid-electrolyte-free environment of AEMFCs and AEMWEs, as the hydration and alkaline conditions do not always mimic actual operando conditions, yielding misleading and inaccurate indications of degradation rates for relatively low hydration conditions. We recently reported a unique ex-situ method which determines the alkaline stability of AEMs under conditions that mimic in-situ operating environments. In this study, we apply this technique to determine the alkaline stability of several AEMs containing different functional group and backbone chemistries. The alkaline stability of HDPE-based radiation-grafted (RG)-AEMs containing different functional group chemistries follows the trend: TMA >= MPY similar to MPIP square DEMA > TEA. Radiation-grafted AEMs (and a non-radiation-grafted PPO benchmark) containing different backbones and the same stable TMA group follows the stability order: ETFE >= LDPE > HDPE square PPO. This technique is recommended for ex-situ testing of the alkaline stability of AEMs for both AEMFC and AEMWE applications.