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Confning TiO2 Nanotubes in PECVD‑Enabled Graphene Capsules Toward Ultrafast K‑Ion Storage: In Situ TEM/XRD Study and DFT Analysis

Journal Article


Abstract


  • © 2020, © 2020, The Author(s). Titanium dioxide (TiO2) has gained burgeoning attention for potassium-ion storage because of its large theoretical capacity, wide availability, and environmental benignity. Nevertheless, the inherently poor conductivity gives rise to its sluggish reaction kinetics and inferior rate capability. Here, we report the direct graphene growth over TiO2 nanotubes by virtue of chemical vapor deposition. Such conformal graphene coatings effectively enhance the conductive environment and well accommodate the volume change of TiO2 upon potassiation/depotassiation. When paired with an activated carbon cathode, the graphene-armored TiO2 nanotubes allow the potassium-ion hybrid capacitor full cells to harvest an energy/power density of 81.2 Wh kg−1/3746.6 W kg−1. We further employ in situ transmission electron microscopy and operando X-ray diffraction to probe the potassium-ion storage behavior. This work offers a viable and versatile solution to the anode design and in situ probing of potassium storage technologies that is readily promising for practical applications.[Figure not available: see fulltext.].

Authors


  •   Gao, Peng. (external author)
  •   Cai, Jingsheng. (external author)
  •   Sun, Jingyu. (external author)
  •   Shao, Yuanlong. (external author)
  •   Xu, Feng. (external author)
  •   Cai, Ran. (external author)
  •   Sun, Zhongti. (external author)
  •   Wang, Xiangguo. (external author)
  •   Wei, Nan. (external author)
  •   Dou, Shi Xue

Publication Date


  • 2020

Citation


  • Cai, J., Cai, R., Sun, Z., Wang, X., Wei, N., Xu, F., Shao, Y., Gao, P., Dou, S. & Sun, J. (2020). Confning TiO2 Nanotubes in PECVD‑Enabled Graphene Capsules Toward Ultrafast K‑Ion Storage: In Situ TEM/XRD Study and DFT Analysis. Nano-Micro Letters, 12 (1),

Scopus Eid


  • 2-s2.0-85086021480

Ro Full-text Url


Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/4206

Has Global Citation Frequency


Start Page


End Page


Volume


  • 12

Issue


  • 1

Place Of Publication


  • Germany

Abstract


  • © 2020, © 2020, The Author(s). Titanium dioxide (TiO2) has gained burgeoning attention for potassium-ion storage because of its large theoretical capacity, wide availability, and environmental benignity. Nevertheless, the inherently poor conductivity gives rise to its sluggish reaction kinetics and inferior rate capability. Here, we report the direct graphene growth over TiO2 nanotubes by virtue of chemical vapor deposition. Such conformal graphene coatings effectively enhance the conductive environment and well accommodate the volume change of TiO2 upon potassiation/depotassiation. When paired with an activated carbon cathode, the graphene-armored TiO2 nanotubes allow the potassium-ion hybrid capacitor full cells to harvest an energy/power density of 81.2 Wh kg−1/3746.6 W kg−1. We further employ in situ transmission electron microscopy and operando X-ray diffraction to probe the potassium-ion storage behavior. This work offers a viable and versatile solution to the anode design and in situ probing of potassium storage technologies that is readily promising for practical applications.[Figure not available: see fulltext.].

Authors


  •   Gao, Peng. (external author)
  •   Cai, Jingsheng. (external author)
  •   Sun, Jingyu. (external author)
  •   Shao, Yuanlong. (external author)
  •   Xu, Feng. (external author)
  •   Cai, Ran. (external author)
  •   Sun, Zhongti. (external author)
  •   Wang, Xiangguo. (external author)
  •   Wei, Nan. (external author)
  •   Dou, Shi Xue

Publication Date


  • 2020

Citation


  • Cai, J., Cai, R., Sun, Z., Wang, X., Wei, N., Xu, F., Shao, Y., Gao, P., Dou, S. & Sun, J. (2020). Confning TiO2 Nanotubes in PECVD‑Enabled Graphene Capsules Toward Ultrafast K‑Ion Storage: In Situ TEM/XRD Study and DFT Analysis. Nano-Micro Letters, 12 (1),

Scopus Eid


  • 2-s2.0-85086021480

Ro Full-text Url


Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/4206

Has Global Citation Frequency


Start Page


End Page


Volume


  • 12

Issue


  • 1

Place Of Publication


  • Germany