POS6-0825
Ir-Efficient Nb2O5@IrO2 Core–Shell Electrocatalysts for Acidic Oxygen Evolution Reaction
When and Where
Nov 30, -0001
00:00 - 00:00
Room 301 (Grand Ballroom)
Presenter(s)
Soomin Kim (Inha University)
Co-Author(s)
Abstract
Proton exchange membrane water electrolysis (PEMWE) has attracted considerable attention as a sustainable hydrogen production technology owing to its capability for high-current-density operation, high energy efficiency, and the generation of high-purity hydrogen. Nevertheless, the extensive use of Ir-based oxygen evolution reaction (OER) catalysts remains a major obstacle to the broad implementation of PEMWE because of the high cost and scarcity of Iridium. Therefore, designing electrocatalyst architectures that minimize Ir utilization while preserving catalytic activity and durability is essential.
Herein, Nb2O5@IrO2 core–shell catalysts were developed as Ir-efficient electrocatalysts for the OER under acidic conditions. Nb2O5 was employed as a structurally and electrochemically stable core material, while IrO2 was introduced as a catalytically active shell. The morphology and core–shell structure of the synthesized catalysts were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
The OER performance was systematically evaluated using cyclic voltammetry (CV), linear sweep voltammetry (LSV), and chronopotentiometry (CP) in acidic electrolyte. The catalytic properties were assessed based on overpotential, mass activity, electrochemically active surface area (ECSA), and operational stability. The Nb2O5@IrO2 core–shell catalysts showed enhanced acidic OER activity and durability with reduced IrO2 content, indicating that the core–shell configuration is an effective strategy for improving Ir utilization. These results suggest that Nb2O5@IrO2 catalysts are promising anode catalyst candidates for cost-effective PEMWE applications.
Herein, Nb2O5@IrO2 core–shell catalysts were developed as Ir-efficient electrocatalysts for the OER under acidic conditions. Nb2O5 was employed as a structurally and electrochemically stable core material, while IrO2 was introduced as a catalytically active shell. The morphology and core–shell structure of the synthesized catalysts were investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
The OER performance was systematically evaluated using cyclic voltammetry (CV), linear sweep voltammetry (LSV), and chronopotentiometry (CP) in acidic electrolyte. The catalytic properties were assessed based on overpotential, mass activity, electrochemically active surface area (ECSA), and operational stability. The Nb2O5@IrO2 core–shell catalysts showed enhanced acidic OER activity and durability with reduced IrO2 content, indicating that the core–shell configuration is an effective strategy for improving Ir utilization. These results suggest that Nb2O5@IrO2 catalysts are promising anode catalyst candidates for cost-effective PEMWE applications.
