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염상호(SANG HO YEOM),윤영화(YOUNG HWA YUN),최승욱(SEUNGWOOK CHOI),권지희(JIHEE KWON),이세찬(SECHAN LEE),이재훈(JAE HUN LEE),이창수(CHANGSOO LEE),김민중(MINJOONG KIM),김상경(SANG-KYUNG KIM),엄석기(SUKKEE UM),김창희(CHANG-HEE KIM),조원철( 한국수소및신에너지학회 2021 한국수소 및 신에너지학회논문집 Vol.32 No.6
The porous transport layer (PTL) is essential to effectively remove oxygen and hydrogen gas from the electrode surface at high current density operation conditions. In this study, the effect of PTL with different characteristics such as pore size, pore gradient, interfacial coating was investigated by multi-layered sintered mesh. A water electrolysis single cell of active area of the 34.56 cm² was constructed, and IV performance and impedance analysis were conducted in the range of 0 to 2.0 A/cm². It was confirmed that the multi-layered sintered mesh PTL, which have an average pore size of 25 to 57 μm and a larger pore gradient, removed bubbles effectively and thus seemed to improve IV performance. Also, it was confirmed that the catalytic metals such as Ni, NiMo coating on the PTL reduced activation overpotential, but increased mass transport overpotential.