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hence the highest boundary region where the hydrophilic S block locates as illustrated a slightly higher maximum power density. The improvement could be attributed to the Materials 2021, 14, 1617 (yellow) in the inset of Figure 12. There are both boundaries and necks between domains [24]. The boundary phase is regarded as primary hydrophilic channels whereas the necks as the secondary hydrophilic channel and the hydrophobic coalescing joints. In addition, with the increase in the dose of the hydrophobic block to x = 100, the boundary phase characteristic fades away and the domain sizes reduce, implying more hydrophilic coa- lescence occurs. Finally, when x = 150, the membrane reveals pits where the loci are formed of the aggregated hydrophilic blocks because the dilution of hydrophilic cross- links. Additional FE-SEM images of cross-linked diblock copolymer membranes (in nano- FE-SEM images of cross-linked diblock copolymer membranes (in nano-scale) have been isnccalue)dhedavienbtheenAipnpcleundeidx Ain.the Appendix A. 14 of 20 Materials 2021, 14, x FOR PEER REVIEW Figure 11. FE-SEM images of the three AxGyS-10 cross-linked diblock membranes. Figure 11. FE-SEM images of the three AxGyS-10 cross-linked diblock membranes. 15 of 20 Figure 12. Performance of the A G S-10 cross-linked diblock ionomer membrane electrode assembly (MEA) and a Nafion Figure 12. Performance of the A100G4S10-010 4cross-linked diblock ionomer membrane electrode assembly (MEA) and a Nafion ◦ 117 M11E7AMtEesAtetdesitneda iDnMa FDCMrFuCnnriunngnaint g30at°C30wiCthwait4h.0aM4.0mMethmaentohlafneoeldfe(feldow(flroawter: a5tec:c/5mcicn/mfoirnMfoerOMHeaOnHd a5n0dcc5/0mcicn/fmorin for dry oxygen). Inset: showing the influence of microstructure on the cell performance. dry oxygen). Inset: showing the influence of microstructure on the cell performance. 3.4. Assessment of DMFC Performance 3.4. Assessment of DMFC Performance The mechanical properties of PEM are often evaluated in terms of their ability to form The mechanical properties of PEM are often evaluated in terms of their ability to form freestanding membranes and to withstand the tensile measurements under certain test freestanding membranes and to withstand the tensile measurements under certain test conditions. However, such ability does not directly translate into practical utility of the conditions. However, such ability does not directly translate into practical utility of the PEMs for fuel cell applications. It is current opinion that an important requirement for PEMs for fuel cell applications. It is current opinion that an important requirement for PEMs is their viability to be fabricated into a membrane electrode assembly (MEA), and PEMs is their viability to be fabricated into a membrane electrode assembly (MEA), and the the performance of that MEA in real fuel cell applications. The diblock ionomer mem- performance of that MEA in real fuel cell applications. The diblock ionomer membranes brandeesvdeelovpeleodpiendthinisthstiusdsytuwdyerwetehrertehfoereffoarberifcaabtreidcaatsedthaesMthEeAMsEfoArsDfMorFDCMs.FWChsi.leWahlliloefthe all oifotnhoemioernsocmoeurlsdcfourmldffroeremstafnredeisntganmdeinmgbmraenmesb,rtahneeAs, thGe SA-1500Gm4Se-1m0bmraenmebwranseunwaabsle to 50 4 unabfolermtoafoMrmEAabMecEaAusbeeocfaiutsehiogfhitsswheilglihngswcheallriancgtecrhisatricasctaenrdistpicosoranddimpeonosriodniaml setnasbiiolintay.l The stabihlitgyh.-Twhaetehriguhp-twakaeteirnutphteahkeydinrattheedhAydrGateSd-1A05m0Ge4mS-b1r0amnemsabmrapnlewsams pulneawblaestuonmabailnetain 50 4 tomaninytdainmaenysiodnimalesntsaiboinliatylsdtaubrilnigtyMdEuArinfgabMriEcaAtiofanb.rTichaetilons.sTohfewlaotsesrodfuweatotehrodt-uperetossing hot-prerseussltiendg irnesauvlterdy ibnriattvleraynbdreitatsleilyanfdraegamsielnytferdagmeemnbterdanme.embrane. The TpherefopremrfaonrmceaonfcethoefMthEeAMoEfAcrofscsr-loisnsk-elidnkdeibdlodcibklomcekmbermanberarenperreespenretesednbteydthbey the A100GA41S0-01G04mS-e1m0mbreamnebrwaanseewvaslueavtaelduaintedasininaglsei-nsgtalec-kstDacMkFDCMaFnCdabnedncbhemncahrkmeadrkaegdaiangsatinst the ptherefopremrfaonrmceaonfcae ocof ma cmoemrcmiaelrNcialfiNonafi1o17n-1b1a7se-bdaMseEdAMuEnAdeurnidernitdiceanlttiecsatl cteosntdciotinodnist:ions: an operating temperature of 30 °C and a feed of 4 M aqueous methanol solution to the anode (Figure 12). It was found that both MEAs exhibited rather similar activation losses and ohmic resistance in the overall cell reaction. However, the A100G4S-10-based MEA could deliverPDF Image | Hydrophilic Cross-Linked Aliphatic Hydrocarbon Diblock Copolymer
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