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in response to NO2 gas and UV light of MWCNT/SnO2 hybrid sensor. The UV sensitivity was unchanged under a strain between 0% and 50%. All the results obtained in this paper suggested the fabricated stretchable multifunctional integrated sensing system can be used as next‐generation body‐attached healthcare and environmental sensor devices for continuous nondestructive monitoring.
Figure 2.15 (a, b) Schematic illustration and circuit diagram of 2D multifunctional integrated system, containing a RF power receiver, a MSC array, strain sensor, and UV/NO2 gas sensor. (c, d) Photograph of integrated system attached to human body. (e) Charge/discharge curve of integrated system powered by RF power source. (f) Carotid pulse curve of the strain sensor. (g) NO2 gas response at strain of 0%, 20%, 50%. (h) UV detection under 0% and 50% strain with exposure of 312 nm.
Source: Reproduced with permission [106]. © 2015, Wiley‐VCH.
2.3.4 Perspective
As a new member of the SC family, stretchable devices have been greatly developed in the past few years, buoyed by the portable and wearable electronics, which need a stretchable energy storage to form a complete and safe system to monitor electrical and biomedical signal generated by human activities, thus achieving the practical application of wearable electronics in the field of biomimetic E‐skins, interactive human‐machine interface, “big health” and “big data.” In this review, we systematically summarize the recent progress in stretchable SCs from the perspective of the three dimension and corresponding configuration of the stretchable device, as well as the fabrication process and strategies toward the stretchable SCs. The stretchable integrated system is also concluded in this chapter, all of them realized stable response to the physical and bio‐signal under different stretching or deformations when attached to the human body, showing potential for wearable electronics.
Despite the considerable achievements in stretchable SCs which have been achieved, there are great challenges still remaining for future practical applications. These challenges and the direction for future development can be summarized as follows: (i) Electrochemical performance of SCs under deformation still requires to be improved. Electrode material is the decisive factor of the electrochemical performance. But most of the stretchable SCs depend on the CNTs, which lead to the low specific capacitance of the devices. Discovering novel kinds of electrode materials and design of various configuration for stretchable SCs are one of the promising directions. (ii) The elastic substrate with high stretchability and skin‐touched feature is desired. The most popular elastic substrate used in stretchable devices is PDMS. However, it possesses hydrophobic properties. Electrode materials with binder like PVDF covered on the PDMS usually need to face the detaching problem, which is not of benefit to the mechanical stability of the devices. A stretchable substrate that ensures electrode materials direct growth on it may be a great way to develop stretchable devices. (iii) More attention should be focused on the development of air stable gel electrolyte. Most of the existing all‐solid‐state gel electrolyte is water‐based polymer gel electrolyte, which have a short lifespan under air ambient conditions. How to improve the lifespan of the water‐based gel electrolyte in the further development of stretchable SCs must be a significant topic. (iv) The integration and encapsulation method is important for wearable integrated system. For the stretchable multifunctional integrated systems powered by SCs containing several kinds of stretchable devices, the integration and encapsulation method that makes every component work tuneful must be considered. The embedding method is a mature way but can't be the only one for packaging the integrated system. (v) More low‐cost fabrication technology for large scale production of stretchable SCs should be introduced to meet the requirement of the practical application. From the angle of actual application, the large‐scale production of stretchable SCs with low cost also should be considered. Overall, stretchable SCs have been proved as a promising energy storage to power the portable and wearable electronics and occupy an indispensable position in the future development and applications of wearable electronics.
References
1 1 Li, Lou, Z., Chen, D. et al. (2018). Recent advances in flexible/stretchable supercapacitors for wearable electronics. Small 14 (43): e1702829.
2 2 Lee, G., Kim, D., Kim, D. et al. (2015). Fabrication of a stretchable and patchable array of high performance micro‐supercapacitors using a non‐aqueous solvent based gel electrolyte. Energy Environ. Sci. 8 (6): 1764–1774.
3 3 Hu, H., Pei, Z., and Ye, C. (2015). Recent advances in designing and fabrication of planar micro‐supercapacitors for on‐chip energy storage. Energy Storage Mater. 1: 82–102.
4 4 Li, L., Wu, Z., Yuan, S. et al. (2014). Advances and challenges for flexible energy storage and conversion devices and systems. Energy Environ. Sci. 7 (7): 2101–2122.
5 5 Chu, X., Zhang, H., Su, H. et al. (2018). A novel stretchable supercapacitor electrode with high linear capacitance. Chem. Eng. J. 349: 168–175.
6 6 Xu, J., Wu, H., Lu, L. et al. (2014). Integrated photo‐supercapacitor based on Bi‐polar TiO2 nanotube arrays with selective one‐side plasma‐assisted hydrogenation. Adv. Funct. Mater. 24 (13): 1840–1846.
7 7 Chen, X., Lin, H., Chen, P. et al. (2014). Smart, stretchable supercapacitors. Adv. Mater. 26 (26): 4444–4449.
8 8 Huang, Y., Liang, J., and Chen, Y. (2012). An overview of the applications of graphene‐based materials in supercapacitors. Small 8 (12): 1805–1834.
9 9 Zheng, Y., Yang, Y., Chen, S. et al. (2016). Smart, stretchable and wearable supercapacitors: prospects and challenges. CrystEngComm 18 (23): 4218–4235.
10 10 Senthilkumar, B., Vijaya, S.K., Sanjeeviraja, C. et al. (2013). Synthesis and physico‐chemical property evaluation of PANI–NiFe2O4 nanocomposite as electrodes for supercapacitors. J. Alloys Compd. 553: 350–357.
11 11 Mahmood, Q., Park, S.K., Kwon, K.D. et al. (2016). Transition from diffusion‐controlled intercalation into extrinsically pseudocapacitive charge storage of MoS2 by nanoscale heterostructuring. Adv. Energy Mater. 6 (1): n/a‐n/a.
12 12 Hsia, B., Marschewski, J., Wang, S. et al. (2014). Highly flexible, all `solid‐state micro‐supercapacitors from vertically aligned carbon nanotubes. Nanotechnology 25 (5): 055401.
13 13 An, C.H., Wang, Y.J., Huang, Y.N. et al. (2014). Porous NiCo2O4 nanostructures for high performance supercapacitors via a microemulsion technique. Nano Energy 10: 125–134.
14 14 Wu, H., Jiang, K., Gu, S. et al. (2015). Two‐dimensional Ni(OH)2 nanoplates for flexible on‐chip microsupercapacitors. Nano Res. 8 (11): 3544–3552.
15 15 Yu, Z.‐Y., Chen, L.‐F., and Yu, S.‐H. (2014). Growth of NiFe2O4 nanoparticles on carbon cloth for high performance flexible supercapacitors. J. Mater. Chem. A 2 (28): 10889.
16 16 Li, L., Lou, Z., Han, W. et al. (2016). Flexible in‐plane microsupercapacitors with electrospun NiFe2O4 nanofibers for portable sensing applications. Nanoscale 8 (32): 14986–14991.
17 17 Ai, Y., Lou, Z., Li, L. et al. (2016). Meters‐long flexible CoNiO2‐nanowires@carbon‐fibers based wire‐supercapacitors for wearable electronics. Adv. Mater. Technol. 1 (8): 1600142.
18 18 Zhao, X., Zheng, B., Huang, T. et al. (2015). Graphene‐based single fiber supercapacitor with a coaxial structure. Nanoscale 7 (21): 9399–9404.
19 19 Wu, Z.S., Parvez, K., Feng, X. et al. (2013). Graphene‐based in‐plane micro‐supercapacitors with high power and energy