Octopus-like side chain grafted poly(arylene piperidinium) membranes for fuel cell application

Ma, Lingling; Hussain, Manzoor; Lv, Li; Qaisrani, Naeem Akhtar; Bai, Lei; Jia, Yabin; Yan, Xiaoming; Zhang, Fengxiang; He, Gaohong

doi:10.1016/j.memsci.2021.119529

Cited by 46 publications

(50 citation statements)

References 70 publications

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“…The E a values for qPBN-CA 60,40,20,10 AEMs are 13.4, 13.2, 13.6, and 12.5 kJ mol –1 , respectively. The lower E a is obtained suggesting more facilitate hydroxide ion transport have been constructed in qPBN-CAy AEMs than in our previous octopus-like AEMs (12.5–15.1 kJ mol –1 ) …”

Section: Resultscontrasting

confidence: 55%

“…Moreover, qPBN-CA-based AEMFCs achieved 403 mW cm –2 in H 2 /air (CO 2 free) at 60 °C and 100% relative humidity. As shown in Figure b, the ohmic resistance of qPBN-CA 40 -based MEA is about 0.08 Ω cm 2 , which is lower than our previous octopus-like AEM (0.09 Ω cm 2 ), , resulting in higher peak power density. These results could confirm the structural advantage of hydrophilic–hydrophobic bulky units comodified AEM in AEMFCs.…”

Section: Resultsmentioning

confidence: 56%

“…As can be seen from Figure b, there is only a slight change of integral area for the signal at around 2.96 ppm (H 7 ) coming from methyl group of piperidine . The new signals appear at about 0.8 and 1.2 ppm indicating the occurrence of nucleophilic substitution . The signals between 4.5 and 6 ppm corresponds to the Hofmann elimination, which is unobvious.…”

Section: Resultsmentioning

confidence: 90%

“…The alkaline stability was determined by prolonged immersing AEM in a 1 M NaOH at 80 °C; changes of its 1 H NMR and ionic conductivity were monitored. The water uptake, swelling ratio, and fractional free volume (FFV) were calculated by previous method. , The IEC was determined by back-titration and calculated by reported equations . The conductivity measurement was carried out using electrochemical station (Ivium-n-Stat).…”

Section: Methodsmentioning

confidence: 99%

“…However, the mobility of cations is limited because of the cross-linked structure. Therefore, we then grafted the long side chain onto CD directly to improve the mobility . The resultant octopus-like structure can promote microphase separation and provide high free volume.…”

Section: Introductionmentioning

confidence: 99%

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Hydrophilic–Hydrophobic Bulky Units Modified Anion Exchange Membranes for Fuel Cell Application

Yuan

et al. 2022

ACS Sustainable Chem. Eng.

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The hydroxide conductivity and alkaline stability play a significant role in the application of an anion exchange membranes (AEMs) fuel cell. These high performances are closely related to the structure of the polymer. Side-chain structure is commonly used to construct microphase separation. On this basis, a new strategy is to incorporate a rigid bulky structure into an AEM to break chain packing and reduce resistance against hydroxide ion transport. In this work, rigid bulky hydrophilic–hydrophobic side-chain grafted, ether-free poly(biphenyl indole) (PBN) AEMs are designed and prepared by chemical incorporation of hydrophilic bulky cyclodextrin and hydrophobic bulky adamantane onto the PBN backbone. The enhanced driving force of microphase separation and the enlarged free volume can make for high hydroxide conductivity. The fabricated AEM with an ion exchange capacity (IEC) of 1.81 mmol g–1 shows a conductivity of 122.0 mS cm–1 at 80 °C, which can be retained by 90% after treatment of the AEM in a 1 M NaOH solution at 80 °C for 1008 h. Its single H2/O2 fuel cell yields a peak power density of 603 mW cm–2 at 60 °C; the fuel cell can maintain 70.2% of its initial voltage after operating for 30 h. This strategy provides a new and effective route for the preparation of AEMs with superior performance.

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Section: Resultscontrasting

confidence: 55%

Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 90%