In Situ Formation of Nano Ni–Co Oxyhydroxide Enables Water Oxidation Electrocatalysts Durable at High Current Densities
[1];
[2];
[2];
[4];
[6]
- Department of Materials Science and Engineering University of Toronto 184 College Street Toronto Ontario M5S 3E4 Canada, Department of Electrical and Computer Engineering University of Toronto 35 St George Street Toronto Ontario M5S 1A4 Canada
- Department of Chemistry Queen's University 90 Bader Lane Kingston Ontario K7L 3N6 Canada
- Department of Chemical Engineering McMaster University Hamilton Ontario L8S 4L7 Canada
- Department of Mechanical and Industrial Engineering University of Toronto 5 King's College Road Toronto Ontario M5S 3G8 Canada
- Department of Materials Science and Engineering University of Toronto 184 College Street Toronto Ontario M5S 3E4 Canada
- Department of Electrical and Computer Engineering University of Toronto 35 St George Street Toronto Ontario M5S 1A4 Canada
Abstract The oxygen evolution reaction (OER) limits the energy efficiency of electrocatalytic systems due to the high overpotential symptomatic of poor reaction kinetics; this problem worsens over time if the performance of the OER electrocatalyst diminishes during operation. Here, a novel synthesis of nanocrystalline Ni–Co–Se using ball milling at cryogenic temperature is reported. It is discovered that, by anodizing the Ni–Co–Se structure during OER, Se ions leach out of the original structure, allowing water molecules to hydrate Ni and Co defective sites, and the nanoparticles to evolve into an active Ni–Co oxyhydroxide. This transformation is observed using operando X‐ray absorption spectroscopy, with the findings confirmed using density functional theory calculations. The resulting electrocatalyst exhibits an overpotential of 279 mV at 0.5 A cm −2 and 329 mV at 1 A cm −2 and sustained performance for 500 h. This is achieved using low mass loadings (0.36 mg cm −2 ) of cobalt. Incorporating the electrocatalyst in an anion exchange membrane water electrolyzer yields a current density of 1 A cm −2 at 1.75 V for 95 h without decay in performance. When the electrocatalyst is integrated into a CO 2 ‐to‐ethylene electrolyzer, a record‐setting full cell voltage of 3 V at current density 1 A cm −2 is achieved.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1821021
- Journal Information:
- Advanced Materials, Journal Name: Advanced Materials Journal Issue: 45 Vol. 33; ISSN 0935-9648
- Publisher:
- Wiley Blackwell (John Wiley & Sons)Copyright Statement
- Country of Publication:
- Germany
- Language:
- English
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