Electrochemical integration of amorphous NiFe (oxy)hydroxides on surface-activated carbon fibers for high-efficiency oxygen evolution in alkaline anion exchange membrane water electrolysis
| Autor: | Kwang S. Kim, Pandiarajan Thangavel, Guntae Kim |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Tafel equation
Electrolysis Materials science Electrolysis of water Renewable Energy Sustainability and the Environment Oxygen evolution 02 engineering and technology General Chemistry Alkaline anion exchange membrane Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology Electrochemistry 01 natural sciences 0104 chemical sciences Anode law.invention Chemical engineering law General Materials Science 0210 nano-technology |
| Zdroj: | Journal of Materials Chemistry A. 9:14043-14051 |
| ISSN: | 2050-7496 2050-7488 |
| DOI: | 10.1039/d1ta02883a |
| Popis: | Developing practical water-splitting devices that convert earth-abundant solar energy and water into renewable fuel holds promise for a sustainable energy future; however, its successful commercialization for practical applications is limited by the sluggish kinetics of the oxygen evolution reaction (OER). Herein, we developed a high-efficiency and low-cost three-dimensional (3D) OER electrode via electrochemical integration of amorphous NiFeOOH on surface activated carbon fiber paper (CFP). The as-synthesized 3D-a-NiFeOOH/N-CFP electrode exhibits an ultra-low overpotential η(O2) of 170 mV to afford 10 mA cm−2 current density, together with a Tafel slope of 39 mV per decade, and excellent stability under OER conditions. Apart from the synergistic effect, the excellent OER activity of a-NiFeOOH/N-CFP is attributed to the unique 3D structure with enriched active sites and the improved electrical conductivity that facilitates the fast OER kinetics and mass transport properties. As a result, the catalyst achieves a high turnover frequency (TOF) of 0.99 s−1 and mass activity (jm) of 2527 A g−1 at η(O2) 270 mV, which outperforms so far reported state-of-the-art OER catalysts and commercial IrO2. Besides, an alkaline anion exchange membrane water electrolyzer fabricated with the a-NiFeOOH/N-CFP anode delivers 1 A current at 1.88 V with a long-term durability of 240 h. These findings highlight the design of high-efficiency OER catalysts and significant advancements towards the utilization of NiFeOOH catalysts for commercial applications. |
| Databáze: | OpenAIRE |
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