Lee, Jong Yoon Park, Hee-Young Hwang, Sang Youp Lee, Gi Won Park, Gwan Gyu Hupp, Joseph T. Jang, Jong Hyun Joh, Han-Ik 2025-04-25T07:31:11Z 2025-04-25T07:31:11Z 2025-04-25 2025-04 1944-8244 https://pubs.kist.re.kr/handle/201004/152334 The efficiency of proton exchange membrane water electrolysis (PEMWE) is a critical issue in realizing the production of green hydrogen. The coexistence of three phases in the catalyst layer of PEMWE causes mass transport limitation at the interfaces between them. In particular, the vigorous production of gaseous hydrogen and oxygen derived from liquid water is generated in the form of bubbles that seriously deactivate the membrane electrode assembly (MEA). In this study, we investigated the effect of porous structure in the electrode on the efficiency of hydrogen production at a high current density, which is highly related to the mass transport limitation. A widely used commercial catalyst (IrO2) was directly coated on the membrane by the electro-spray method. Porous electrodes on the membrane were formed by the charged catalyst particles that repulsed each other due to their electrostatic forces. Our membrane electrode assembly (MEA) exhibited outstanding electrolysis performances such as 5.3 A cm-2 and 3.2 A cm-2 at 2.0 and 1.8 V, respectively, which are the highest values compared with the results published in the current studies. In addition to porosity, it was confirmed that optimum binder contents positively affect the hydrophobicity and contact resistance of MEA. Through a simple porosity-controlled technique, the performance of PEMWE, in which three phases coexist, can be improved by more than 60 %. Accordingly, we expect that our systematic study on the role of porosity in the electrodes opens a new era to efficiently produce green hydrogen. English American Chemical Society Effect of Electro-Sprayed Porous Electrodes on the Performance and Stability of Water Electrolysis Article 10.1021/acsami.4c21901 1 ACS Applied Materials & Interfaces, v.17, no.16, pp.24547 - 24555 ACS Applied Materials & Interfaces 17 16 24547 24555 N scie scopus 001465855200001 2-s2.0-105002371337 Nanoscience & Nanotechnology Materials Science, Multidisciplinary Science & Technology - Other Topics Materials Science Article TRIPLE PHASE-BOUNDARY CATALYST LAYER MESOPOROUS CARBON PEMFC ELECTRODES IONOMER CONTENT MEMBRANE EVOLUTION ENHANCEMENT DURABILITY INSIGHTS mass transport limitation electrolysis electro-spraydeposition membrane electrode assembly porouscatalyst layer proton exchange membrane water electrolysis(PEMWE)