DataVXACS Applied Materials & InterfacesPaper
journal article·2019-12-11Open access

Amorphous Mo–Ta Oxide Nanotubes for Long-Term Stable Mo Oxide-Based Supercapacitors

Bowen Jin, Seyedsina Hejazi, Florian Pyczak, Michael Oehring, Shiva Mohajernia, Stepan Kment, Ondrej Tomanec, Radek Zboril, Nhat Truong Nguyen, Min Yang, Patrik Schmuki

ACS Applied Materials & Interfaces· Volume 11· Issue 49
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Source abstract

Abstract

With a large-scale usage of portable electric appliances, a high demand for increasingly high-density energy storage devices has emerged. MoO 3 has, in principle, a large potential as a negative electrode material in supercapacitive devices due to high charge densities that can be obtained from its reversible redox reactions. Nevertheless, the extremely poor electrochemical stability of MoO 3 in aqueous electrolytes prevents a practical use in high capacitance devices. In this work, we describe how to overcome this severe stability issue by forming amorphous molybdenum oxide/tantalum oxide nanotubes by anodic oxidation of a Mo–Ta alloy. The presence of a critical amount of Ta oxide (>20 at. %) prevents the electrochemical decay of the MoO 3 phase and thus yields an extremely high stability. Due to the protection provided by tantalum oxide, no capacitance losses are measureable after 10,000 charging/discharging cycles.
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Research context

Energy storageMetals & alloysNanomaterials

OpenAlex topics: Supercapacitor Materials and Fabrication · Advancements in Battery Materials · Electrocatalysts for Energy Conversion

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, PR China

Department of Materials Science, Institute for Surface Science and Corrosion WW4-LKO, University of Erlangen-Nuremberg, Martensstraße 7, D-91058 Erlangen, Germany

Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH, Max-Planck-Straße 1, 21502 Geesthacht, Germany

Regional Centre of Advanced Technologies and Materials, Palacky University Olomouc, 17. Listopadu 50A, 772 07 Olomouc, Czech Republic

Department of Chemistry, King Abdulaziz University, Jeddah, Saudi Arabia

Funding

Deutsche Forschungsgemeinschaft · China Scholarship Council · National Natural Science Foundation of China · H2020 European Research Council

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