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Hierarchical micro-reactor as electrodes for water splitting by metal rod tipped carbon nanocapsule self-assembly in carbonized wood
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2019 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883Article in journal (Refereed) Published
Abstract [en]

Materials design of efficient electrochemical micro-reactors is challenging, although hierarchically structured, self-standing electrodes with catalyst arrays offer promise. Herein, catalyst function in compact micro-reactor electrodes is designed by nanostructural tailoring of carbonized wood for efficient water splitting. Specifically, NiFe rod tipped, N-doped graphitic carbon nanocapsule arrays are self-assembled in hierarchical wood, and the benefit of this unique presentation and its promotive effect on accessibility of the catalyst surfaces is apparent. This report also comprises the first wood based micro-reactor electrodes for electrocatalytic water oxidation demonstrating excellent performance. The overpotential for oxygen evolution reaction was as low as 180 mV for 10 mA cm−2 current density and TOFredox was high at a level of 5.8 s−1 (at 370 mV overpotential). This hierarchical electrode can also work as bifunctional catalysts (both as anodic and as cathodic electrode) for total water splitting with a cell potential of 1.49 V for 10 mA cm-2 in alkaline solution, suggestive of their potential also in other electrochemical applications.

Place, publisher, year, edition, pages
2019.
National Category
Nano Technology
Research subject
Engineering Science with specialization in Nanotechnology and Functional Materials
Identifiers
URN: urn:nbn:se:uu:diva-400207DOI: 10.1016/j.apcatb.2019.118536OAI: oai:DiVA.org:uu-400207DiVA, id: diva2:1380540
Available from: 2019-12-19 Created: 2019-12-19 Last updated: 2019-12-19

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Publisher's full texthttps://www.sciencedirect.com/science/article/abs/pii/S0926337319312822
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Nanotechnology and Functional Materials
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Applied Catalysis B: Environmental
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