当前位置: X-MOL 学术Appl. Catal. B Environ. Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Enhancing fuel cell catalyst layer stability using a dual-function sulfonated silica-based ionomer
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2018-03-22 , DOI: 10.1016/j.apcatb.2018.03.080
Reza Alipour Moghadam Esfahani , Holly M. Fruehwald , Foroughazam Afsahi , E. Bradley Easton

Sulfonated-silica ceramic carbon electrodes (SS-CCE) were prepared by an in-situ sol-gel reaction where tetraethylorthosilicate and 3-trihydroxysilyl-1-propanesulfonic acid (TPS) are polymerized in the presence of a commercial Pt/C catalyst. The resultant catalyst layer is a promising candidate for application in proton exchange membrane fuel cells (PEMFCs), however their durability is unproven to date. To that end, we have examined the durability of these SS-CCE’s in fuel cells. The SS-CCE was subjected to an accelerated stress testing (AST) and its fuel cell performance was assessed before and after the AST. Remarkably, the SS-CCE was substantially more durable than a conventional Nafion-based electrode employing the identical Pt/C catalyst. Detailed electrochemical tests and post-mortem analysis of each electrode revealed in addition to its primary function of conducting ions/retaining water, the sulfonated silica ionomer takes on the dual role of stabilizing the Pt/C catalysts through an electronic effect that mitigates Pt nanoparticles Ostwald ripening/agglomeration. The method for producing SS-CCE is highly versatile and could potentially be employed with any fuel cell catalyst. It is therefore proposed that this dual-function ionomer could be paired with almost any Pt/C (or supported alloy catalyst) and extend the operational lifetime of fuel cells without comprising beginning of life performance.



中文翻译:

使用双功能磺化二氧化硅基离聚物提高燃料电池催化剂层的稳定性

通过原位制备磺化二氧化硅陶瓷碳电极(SS-CCE)溶胶-凝胶反应,其中原硅酸四乙酯和3-三羟基甲硅烷基-1-丙烷磺酸(TPS)在市售Pt / C催化剂存在下聚合。所得的催化剂层是用于质子交换膜燃料电池(PEMFC)的有希望的候选物,但是迄今为止其耐久性尚未得到证实。为此,我们检查了这些SS-CCE在燃料电池中的耐久性。对SS-CCE进行了加速应力测试(AST),并在AST前后评估了其燃料电池性能。值得注意的是,SS-CCE比使用相同Pt / C催化剂的传统基于Nafion的电极更加耐用。除了电极的主要功能是传导离子/保留水外,还对每个电极进行了详细的电化学测试和验尸分析,磺化二氧化硅离聚物通过减轻Pt纳米颗粒奥斯特瓦尔德熟化/团聚的电子效应而担负着稳定Pt / C催化剂的双重作用。制备SS-CCE的方法用途广泛,可以与任何燃料电池催化剂一起使用。因此,提出该双功能离聚物可以与几乎任何Pt / C(或负载的合金催化剂)配对并延长燃料电池的使用寿命,而不包括使用寿命的开始。

更新日期:2018-03-22
down
wechat
bug