The proton exchange membrane water electrolyzer (PEMWE), driven by electrocatalysts, is a promising green technology for producing hydrogen. It provides high current density (0.6-2.0 A cm-2 at 1.75-2.20 V per cell) and high energy conversion efficiency (80-90%). Ir-Based catalysts are the current state-of-the-art electrocatalyst materials, and have been widely utilized because they offer high oxygen evolution reaction (OER) activity and moderate resistance to acidic corrosion. However, the OER durability of Ir-based catalysts does not meet the practical demands. At low pH values the anodic potential (1.8-2.2 V) driving the OER usually oxidizes Ir-based catalysts and makes them vulnerable to dissolution, which in turn degrades the electrocatalytic activity and long-term stability. In order to address the problems associated with these Ir-based catalysts, a number of multimetallic compositions have been investigated, and, notably, increases in mass activity and durability compared with Ir-based catalysts have been accomplished. Here, notable recent advances in the development and understanding of multimetallic electrocatalysts toward the OER in acidic media are presented. Synthetic strategies, synergies in multimetallic systems, and their catalytic performances are systematically discussed in an attempt to advance the development of economical and eco-friendly hydrogen production. Lastly, the challenges and the outlook for further development are discussed.
Bibliographical noteFunding Information:
This work was supported by the KIST Institutional Program (2E31002). This work was supported by the Industrial Strategic Technology Development Program (20011712) funded by the Ministry of Trade, Industry & Energy (MOTIE, Korea). This work was supported by National Research Foundation of Korea (NRF-2020R1A2B5B03002475, NRF-2019R1A6A1A11044070, NRF-2019M3E6A1064709, NRF-2020R1A6A3A01096557). The Korea Basic Science Institute under the R&D program (Project No. C38530), Korea University Future Research Grant (KU-FRG), and a Korea University Grant to T. Kim.
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ASJC Scopus subject areas
- General Materials Science
- Materials Chemistry