Recent progress in the development of water oxidation electrocatalysts has mainly focused on achieving high performance in a single measurement, while the importance of durability has not yet been deeply studied. Additionally, oxygen evolution reaction (OER) involves a phase transition from a liquid to a gas, and thus, the removal of the generated oxygen bubble is an important factor for improving the activity or maintaining the performance. In this study, 3D ordered nanoporous nickel electrode is synthesized with a thickness of 5 µm by using a templating method composed of proximity field nanopatterning (PnP) and electrodeposition followed by introduction of NiFe(OH)2 on the nickel electrode to increase the OER activity. The unique nanopore array structure of the electrode has advantages of not only an enlarged active surface area but also the fast removal of oxygen bubbles by spatial confinement effect. Consequently, the NiFe-decorated 3D ordered nanoporous nickel electrode shows a highly efficient oxygen-evolving ability with a turnover frequency of 2.9 s−1 and an ultralong durability of 300 h.
Bibliographical noteFunding Information:
This work is mainly supported by the NRF of Korea Grant funded by the Ministry of Science, ICT, and Future Planning ( NRF-2016R1A2A1A05005216, 2015M1A2A2074663, 2016M3D3A1A01913254 ). S. Jeon acknowledges the support by the Multi-Ministry Collaborative R&D Program (Development of Techniques for Identification and Analysis of Gas Molecules to Protect Against Toxic Substances) through the National Research Foundation of Korea (NRF) funded by KNPA, MSIT, MOTIE, ME, and NFA ( 2017M3D9A1073501 ).
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Electrical and Electronic Engineering