Lubke, M;
Sumboja, A;
McCafferty, L;
Armer, CF;
Handoko, AD;
Du, Y;
McColl, K;
... Darr, JA; + view all
(2018)
Transition-Metal-Doped alpha-MnO2 Nanorods as Bifunctional Catalysts for Efficient Oxygen Reduction and Evolution Reactions.
ChemistrySelect
, 3
(9)
pp. 2613-2622.
10.1002/slct.201702514.
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Brett revised manuscript MnO2.pdf - Accepted Version Download (2MB) | Preview |
Abstract
Nano‐sized α‐MnO2 nanorods doped with Co or Ru were directly synthesized using a continuous hydrothermal synthesis process (production rate 10 g h−1) and investigated as relatively inexpensive (due to the small Ru content) bifunctional catalysts for both the Oxygen Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER). The materials were extensively characterized using a range of analytical methods; these including Extended X‐Ray Absorption Fine Structure (EXAFS) spectroscopy measurements, which was accompanied by density functional theory studies, in order to elucidate the role of dopants in α‐MnO2 structure. Electrochemical ORR and OER investigations of the as‐prepared doped α‐MnO2 nanomaterials were compared to more expensive Pt/C or RuO2 catalysts. The doped manganese oxide nanomaterials were used as bifunctional catalysts in the positive electrode of zinc air batteries (with oversized zinc metal negative electrode and limited density of discharge window) and displayed excellent performance (the overpotential was 0.77 and 0.68 V for α‐MnO2 modified with 7.6 at% Co and 9.4 at% Ru, respectively). Overall, as a result of doping, this study achieved improved bifunctional catalytic activities of metal oxide catalysts, which was comparable to more expensive alternatives.
| Type: | Article |
|---|---|
| Title: | Transition-Metal-Doped alpha-MnO2 Nanorods as Bifunctional Catalysts for Efficient Oxygen Reduction and Evolution Reactions |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/slct.201702514 |
| Publisher version: | https://doi.org/10.1002/slct.201702514 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Science & Technology, Physical Sciences, Chemistry, Multidisciplinary, Chemistry, Continuous hydrothermal flow synthesis, MnO2, doping, oxygen reduction, oxygen evolution, Zn-air batteries, ZINC-AIR BATTERIES, LITHIUM-ION BATTERIES, HIGH-PERFORMANCE, TEMPERATURE SYNTHESIS, NEGATIVE ELECTRODES, MANGANESE-DIOXIDE, WATER OXIDATION, ALKALINE MEDIA, OXIDE, ELECTROCATALYSTS |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10049213 |
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