Performance of polyethylene based radiation grafted anion exchange membrane with polystyrene-b-poly (ethylene/butylene)-b-polystyrene based ionomer using NiCo2O4 catalyst for water electrolysis
Performance of polyethylene based radiation grafted anion exchange membrane with polystyrene-b-poly (ethylene/butylene)-b-polystyrene based ionomer using NiCo2O4 catalyst for water electrolysis
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DOI：
10.1016/j.jpowsour.2017.07.026
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发表时间：
2018-02-01
影响因子：
9.2
通讯作者：
Mamlouk, Mohamed
中科院分区：
文献类型：
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作者：
Gupta, Gaurav;Scott, Keith;Mamlouk, Mohamed
以聚苯乙烯-b-聚(乙烯/丁烯)-b-聚苯乙烯(SEBS)为原料，通过氯甲基化反应合成了一种具有与Nafion相当的氢离子电导率的可溶性阴离子交换离聚体，并将其用于NiCo2O4电催化剂电解水。该离聚体在50℃时的离子交换容量为1.9mmolg(-1)，离子电导率为0.14 S cm(-2)。在20℃、100 mA cm(-2)、0.1和1.0M氢氧化钠中，电池电压分别为1.77和1.72V，最佳负载量为10 mg cm(-2)NiCo2O4。在10 mg cm(-2)下，NiCo2O4电解槽的性能至少等于或优于IrO2在2 mg cm(-2)下的性能，且在1h以上具有良好的稳定性，当催化剂喷洒在GDL上而不是CCM上时，在60℃和0.1M KOH下，性能进一步提高到1.65 vat 100 mA cm(-2)。与PEM和碱性电解槽相比，在去离子水中运行时AEM电解槽的性能有限，原因是AEM环境中相当于pH为11.5的缓慢OER，HER活性相对于酸性介质低两个数量级，以及120 mV dec(-1)的高Tafel斜率。(C)2017年作者。爱思唯尔出版公司(Elsevier B.V.)
A soluble anion exchange ionomer with high OH- ion conductivity comparable to that of H+ conductivity of Nafion is synthesised by chloromethylation of polystyrene-b-poly (ethylene/butylene)-b-polystyrene (SEBS) and used with NiCo2O4 electro-catalyst for water electrolysis. The ionomer has an ion exchange capacity of 1.9 mmol g(-1) and ionic conductivity of 0.14 S cm(-2) at 50 degrees C. The cell voltage at 20 degrees C at 100 mA cm(-2) is 1.77 and 1.72 V in, 0.1 and 1.0 M NaOH, respectively, for an optimum loading of 10 mg cm(-2) NiCo2O4. At 10 mg cm(-2) NiCo2O4 electrolyser cell performance is at least equal to or superior to that of IrO2 at 2 mg cm(-2) with excellent stability over 1 h. When the catalyst is sprayed on the GDL instead of CCM, the performance is further improved to 1.65 Vat 100 mA cm(-2) at 60 degrees C & 0.1 M KOH. The limited AEM electrolyser performance when operating with deionised water in comparison to PEM and alkaline electrolyser arises from the sluggish OER in the AEM environment equivalent to pH of 11.5 and the two orders of magnitude lower HER activity with respect to acid medium combined with the high Tafel slope of 120 mV dec(-1) . (C) 2017 The Authors. Published by Elsevier B.V.