WEB Iridium-Based Hollow Nanostructures toward Efficient Oxygen Evolution ElectrocatalysisWednesday (23.09.2020) 17:35 - 17:50 Z: Special Symposia I Part of:
The sluggish kinetics of the oxygen evolution reaction (OER) leads researchers to continue to develop more active and stable electrocatalysts for water electrolysis.1 Currently, the most active OER catalyst is IrO2 in acidic medium, but this catalyst suffers from the scarcity and high cost of precious metal.2 Intense research efforts dedicated to form highly active and stable electrocatalysts; promising approach is the bimetallic framework nanostructures, which can achieve excellent catalytic activity, compared to bulk materials.3 The three-dimensional geometry and exposed corners and edges will have a positive role as the active sites.
Herein, we demonstrate a facile synthesizing method to design core-shell NiIr hollow nanoframes. The catalytic performance of the NiIr hollow structure shows significantly enhanced iridium mass activity and demonstrates excellent durability compared to commercial iridium nanoparticles. Furthermore, our NiIr hollow nanoframe retained its structural shape with excellent robustness after aging processes, which can prevent the degradation of an electrolyzer’s life span. This study provides significant insight into designing efficient electrocatalysts for OER by controlling the structure and compositional distribution of the metals.
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