**Author details**

*A Guide to Small-Scale Energy Harvesting Techniques*

through the world wide efforts.

**Acknowledgements**

**Conflict of interest**

There is no conflict of interest.

electronic signals, which directly reflected the information of mechanical stimuli and environmental conditions without an external power source. By extensively investigating, TENG can effectively harvest mechanical energy in almost any form based on the four fundamental modes, and thus can regard as the self-powered sensors for a wide application under diffident mechanical triggerings. In the future, the continuous endeavors on TENGs will lagerly enhance their output performance. Based on deeply investigating the fundamental menchanism of triboelectrification, it is possible to realize the ultrahigh charge density of TENG via material modification, structure design, or condition optimization. Besides the output perfoermance, the durability and output stability is the other bottleneck that limited the application of TENG, especially comparing with the traditional generator. It might overcome through fabricating new materials or coupling modes of operations. Based on the above discussion and analysis, it can be anticipated that TENG will soon become an ideal small-scall energy haverter with broad application as self-powered sensors

The authors like to thank the financial supports from the National Key R & D Project from Minister of Science and Technology (2016YFA0202704), Beijing Municipal Science & Technology Commission (Z171100000317001, Z171100002017017, Y3993113DF), and National Natural Science Foundation of China (Grant No. 61774016, 21773009, 51432005, 5151101243, 51561145021).

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Jie Wang1,2\*, Linglin Zhou1,2, Chunlei Zhang1,2 and Zhong Lin Wang1,2,3

1 Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, PR China

2 College of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, PR China

3 School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, USA

\*Address all correspondence to: wangjie@binn.cas.cn

© 2019 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
