Elsevier

Nano Energy

Volume 49, July 2018, Pages 481-488
Nano Energy

Full paper
Inkjet printing of δ-MnO2 nanosheets for flexible solid-state micro-supercapacitor

https://doi.org/10.1016/j.nanoen.2018.05.002Get rights and content
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open access

Highlights

  • Two-dimensional δ-MnO2 nanosheet-based ink was developed.

  • All-solid-state symmetrical micro-supercapacitors were fabricated by ink jet printing.

  • Printed micro-supercapacitor displayed excellent cycling stability and mechanical flexibility.

Abstract

Inkjet printing is considered as a promising technique for flexible electronics fabrication owing to its simple, versatile, environmental-friendly and low-cost features. The key to inkjet printing is ink formulation. In this work a highly concentrated ink containing two-dimensional δ-MnO2 nanosheets with an average lateral size of 89 nm and around 1 nm thickness was used. By engineering the formulation of the δ-MnO2 ink, it could be inkjet printed on O2 plasma treated glass and polyimide film substrates to form δ-MnO2 patterns without undesired “coffee-ring” effect. As a proof-of-concept application, all-solid-state symmetrical micro-supercapacitors (MSCs) based on δ-MnO2 nanosheet ink were fabricated. The fabricated MSCs showed excellent mechanical flexibility and good cycling stability with a capacitance retention of 88% after 3600 charge-discharge cycles. The MSCs attained the highest volumetric capacitance of 2.4 F cm−3, and an energy density of 1.8·10−4 Wh cm−3 at a power density of 0.018 W cm−3, which is comparable with other similar devices and show great potential as energy storage units for low-cost flexible and wearable electronics applications.

Keywords

Inkjet printing
Two-dimensional materials
Microsupercapacitor
Flexible electronics
Manganese oxide

Cited by (0)

Yang Wang is now a Ph.D. candidate under Dr. Professor J.E. ten Elshof’s supervision in the MESA+ Institute for Nanotechnology at the University of Twente, the Netherlands. He is currently focusing on inkjet printing two-dimensional materials for flexible energy storage devices application with specific emphasis on supercapacitors.

Dr. Yi-Zhou Zhang received his Bachelor from Nanjing University, after which he obtained Ph.D. from Nanjing University of Posts & Telecommunications in 2016 under the supervision of Prof. Wei Huang and Prof. Wen-Yong Lai. He has been working in the field of flexible electronics, especially on printed flexible devices including supercapacitors, strain sensors, and integrated functional systems.

Dr. David Dubbink obtained his BS and MS degrees (2013), and his Ph.D. (2017) from the University of Twente. Currently, he is working as a postdoctoral researcher at the University of Twente. His work focuses on Pulsed Laser Deposition and analysis of complex oxide thin films.

Dr. Johan E. ten Elshof is professor of Inorganic & Hybrid Nanomaterials Chemistry at the MESA+ Institute for Nanotechnology of the University of Twente in Enschede, Netherlands. His research is focused on novel functional metal oxide & organic-inorganic nanomaterials, nanopatterns and nanostructures from colloidal and chemical solutions, with specific emphasis on low-dimensional structures like flexible nanofibers, nanosheets and nanowires. The main application areas of these materials are in the fields of energy materials and nanoelectronics.