Highly Crystalline Mesoporous Phosphotungstic Acid: A High-Performance Electrode Material for Energy-Storage Applications

Hamid Ilbeygi, In Young Kim, Min Gyu Kim, Wangsoo Cha, Paskalis Sahaya Murphin Kumar, Dae Hwan Park, Ajayan Vinu

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Heteropoly acids (HPAs) are unique materials with interesting properties, including high acidity and proton conductivity. However, their low specific surface area and high solubility in polar solvents make them unattractive for catalytic or energy applications. This obstacle can be overcome by creating nanoporosity within the HPA. We synthesized mesoporous phosphotungstic acid (mPTA) with a spherical morphology through the self-assembly of phosphotungstic acid (PTA) with a polymeric surfactant as stabilized by KCl and hydrothermal treatment. The mPTA nanostructures had a surface area of 93 m2 g−1 and a pore size of 4 nm. Their high thermal stability (ca. 450 °C) and lack of solubility in ethylene carbonate/diethyl carbonate (EC/DEC) electrolyte are beneficial for lithium-ion batteries (LIBs). Optimized mPTA showed a reversible capacity of 872 mAh g−1 at 0.1 A g−1 even after 100 cycles for LIBs, as attributed to a super-reduced state of HPA and the storage of Li ions within the mesochannels of mPTA.

Original languageEnglish
Pages (from-to)10849-10854
Number of pages6
JournalAngewandte Chemie - International Edition
Volume58
Issue number32
DOIs
StatePublished - 5 Aug 2019

Bibliographical note

Funding Information:
H.I. acknowledges the University of South Australia and the University of Queensland for an IPRS scholarship. I.Y.K. acknowledges the research support provided by the Australian Research Council (ARC) through a Discovery Early Career Researcher Award (grant number DE170101069). NEXAFS experiments were financially supported by The Australian Synchrotron. A.V. acknowledges the support of the University of Newcastle and the Australian Research Council (DP1501048248 and DP170104478).

Publisher Copyright:
© 2019 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

  • crystalline structures
  • electrochemistry
  • mesoporous materials
  • phosphotungstic acid
  • soft templating

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