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Hierarchical micro-reactor as electrodes for water splitting by metal rod tipped carbon nanocapsule self-assembly in carbonized wood
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Organic chemistry.ORCID iD: 0000-0002-4831-5138
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Fibre- and Polymer Technology. KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Centres, Wallenberg Wood Science Center.ORCID iD: 0000-0002-1591-5815
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemistry, Organic chemistry.ORCID iD: 0000-0002-9458-4822
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2020 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 264, article id 118536Article 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 catalyst (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
Elsevier, 2020. Vol. 264, article id 118536
Keywords [en]
Carbonized wood, Metal rod tipped carbon nanocapsules, Microfluidic electrodes, Oxygen evolution reaction
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-267782DOI: 10.1016/j.apcatb.2019.118536Scopus ID: 2-s2.0-85076717565OAI: oai:DiVA.org:kth-267782DiVA, id: diva2:1411671
Note

QC 20200304

Available from: 2020-03-04 Created: 2020-03-04 Last updated: 2020-03-04Bibliographically approved

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Sheng, XiaLi, YuanyuanTimmer, BrianBrett, CalvinRoth, Stephan V.Zhang, BiaobiaoFan, LizhouGuo, YaxiaoBerglund, LarsSun, Licheng

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Sheng, XiaLi, YuanyuanTimmer, BrianBrett, CalvinRoth, Stephan V.Zhang, BiaobiaoFan, LizhouGuo, YaxiaoBerglund, LarsSun, Licheng
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Organic chemistryFibre- and Polymer TechnologyWallenberg Wood Science CenterFluid Mechanics and Engineering AcousticsBiocomposites
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