FEU Institute of Technology

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Paula Marielle S. Ababao

Associate

Electrochemical Engineer

Quezon, Metro Manila · FEU Institute of Technology

Personal Information

Short Biography

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Educational Qualification

Masteral · Sep 2020 - Aug 2025

Master of Engineering in Applied Chemistry

Electrochemistry · . - South Korea

Tertiary · Jul 2014 - Oct 2019

Bachelor of Science in Materials Science; Engineering

Advanced Materials · .

Organizations and Memberships

Institute of Materials Engineers of the Philippines

Member · March 15, 2025 - Present

Research Publications

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Journal Article · 10.1016/j.ijhydene.2025.03.110

Mass Activity Boost in Ni@Ir Nanowire Catalysts for Oxygen Evolution Reaction in PEM Water Electrolysis

International Journal of Hydrogen Energy, (2025), Vol. 118, pp. 441-448

Paula Marielle  S. Ababao Paula Marielle S. Ababao , John Jherson Bofill, ... Ilwhan Oh
View Paper

Hydrogen production via water electrolysis faces significant commercialization challenges due to the high cost and scarcity of iridium (Ir). Reducing Ir loading while maintaining high catalytic performance is critical for advancing proton exchange membrane (PEM) water electrolyzers. To address these challenges, this study introduces Ni@Ir core-shell nanowires (CSNW) as a cost-effective catalyst for enhancing Ir utilization in oxygen evolution reaction (OER). Ni@Ir-CSNW features an amorphous Ir shell coating crystalline Ni nanowires, achieving a high BET surface area of 417 m2 g−1 and an electrochemical surface area (ECSA) of 324 m2 g−1. With a reduced Ir loading of 22 wt.%, Ni@Ir-CSNW delivers remarkable performance, including a mass activity of 9.4 A mg−1 which is a 35-fold increase compared to conventional Ir nanoparticle (Ir-NP) catalysts. Ni@Ir-CSNW achieves an overpotential of 260 mV at 10 mA cm−2 and a favorable Tafel slope of 54 mV dec−1. Stability tests further demonstrate 68% retention of mass activity after 100 cycles. This work presents an effective strategy to enhance catalyst performance while reducing Ir usage, contributing to more sustainable and economically viable PEM water electrolysis systems.

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