Jung, Jiyoon Lim, Katie H. Maurya, Sandip Manriquez, Luis Delfin Atanasov, Vladimir Ahn, Cheol-Hee Hwang, Seung Sang Lee, Albert S. Kim, Yu Seung 2024-01-19T12:02:16Z 2024-01-19T12:02:16Z 2022-06-17 2022-05 2380-8195 https://pubs.kist.re.kr/handle/201004/115196 The microstructure of ionomers plays a significantrole in the performance of high-temperature polymer electrolytemembrane fuel cells (HT-PEMFCs). Here, we establish directcorrelations between the properties of dispersing agents and themicrostructure of a protonated phosphonic acid ionomer. Mostimportantly, the formation of the porous structure of a protonatedphosphonic acid ionomer depends on the pKaof the liquid media.Namely, the acid-base interaction between the charged polymerand dispersing agents determines the porosity in the ionomer thinfilms. The HT-PEMFC performance increases with the level ofporosity of the ionomer, as the pores enable fast reactant gasaccessibility. This study concludes the importance of the pKaofionomers'dispersing media for the HT-PEMFC performance. English American Chemical Society Dispersing Agents Impact Performance of Protonated Phosphonic Acid High-Temperature Polymer Electrolyte Membrane Fuel Cells Article 10.1021/acsenergylett.2c00359 1 ACS Energy Letters, v.7, no.5, pp.1642 - 1647 ACS Energy Letters 7 5 1642 1647 N scie scopus 000802291300009 Chemistry, Physical Electrochemistry Energy & Fuels Nanoscience & Nanotechnology Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Science & Technology - Other Topics Materials Science Article PHASE-SEPARATION SOLVENT MICROSTRUCTURE CONSTANT