02183nas a2200253   4500008004100000022001400041245012000055210006900175260000800244300001200252490000600264520129000270653002101560653001501581653001301596653003001609100002801639700002701667700002901694700002901723700002501752700002401777856012801801       2021                        eng d  a2366-748600aIn situ preparation of ionomer as a tool for triple-phase boundary enhancement in 3D graphene supported Pt catalyst0 aIn situ preparation of ionomer as a tool for triplephase boundar  cJAN  a20001250 v53 a<p>For improving the performance of platinum electrocatalysts in polymer electrolyte membrane fuel cells (PEMFCs), it is important to enhance the Pt utilization level in the catalyst systems. A high performing electrocatalyst (Pt/3DNG) is developed for PEMFC applications by using nitrogen-doped 3D graphene (3DNG) as the support material and an in situ grafted active ``triple-phase boundary'' to more precisely control the formation of the proton conducting ionomer interface at the active sites. Considering the 3D morphology of the system, during the electrode fabrication for realistic single-cell evaluation, the concept of in situ generation of the proton conducting-ionomer based ``active triple-phase boundary'' is introduced, which could potentially replace the conventional method of using Nafion ionomer for the electrode preparation. The monomers owing to their small-size can access the pores and inner regions of the 3DNG support, which on UV-curing, undergo polymerization and transform into an ionomer with an extended interfacial network into the nanoregimes of 3DNG. Single cell evaluation of the membrane electrode assembly in a high-temperature PEMFC by using phosphoric acid doped polybenzimidazole membrane demonstrates the utility of the present strategy.</p>
10aelectrocatalysts10afuel cells10agraphene10aoxygen reduction reaction1 aGangadharan, Pranav, K.1 aVijayakumar, Vidyanand1 aNediyirakkal, Shijil, A.1 aFernandez, Roshni, Tresa1 aSiddharthan, Adhrika1 aKurungot, Sreekumar  uhttps://library.ncl.res.in/content/situ-preparation-ionomer-tool-triple-phase-boundary-enhancement-3d-graphene-supported-pt