Ultra-high-rate pseudocapacitive energy storage in two-dimensional transition metal carbides

Maria R. Lukatskaya, Sankalp Kota, Zifeng Lin, Meng Qiang Zhao, Netanel Shpigel, Mikhael D. Levi, Joseph Halim, Pierre Louis Taberna, Michel W. Barsoum, Patrice Simon, Yury Gogotsi

Research output: Contribution to journalArticlepeer-review

1493 Scopus citations

Abstract

The use of fast surface redox storage (pseudocapacitive) mechanisms can enable devices that store much more energy than electrical double-layer capacitors (EDLCs) and, unlike batteries, can do so quite rapidly. Yet, few pseudocapacitive transition metal oxides can provide a high power capability due to their low intrinsic electronic and ionic conductivity. Here we demonstrate that two-dimensional transition metal carbides (MXenes) can operate at rates exceeding those of conventional EDLCs, but still provide higher volumetric and areal capacitance than carbon, electrically conducting polymers or transition metal oxides. We applied two distinct designs for MXene electrode architectures with improved ion accessibility to redox-active sites. A macroporous Ti3 C2 T x MXene film delivered up to 210 F g-1 at scan rates of 10 V s-1, surpassing the best carbon supercapacitors known. In contrast, we show that MXene hydrogels are able to deliver volumetric capacitance of ∼1,500 F cm-3 reaching the previously unmatched volumetric performance of RuO2.

Original languageEnglish (US)
Article number17105
JournalNature Energy
Volume6
DOIs
StatePublished - Jul 10 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology

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