A Flexible Piezoelectric Energy Harvester-Based Single-Layer WS 2 Nanometer 2D Material for Self-Powered Sensors

Quan Wang, Kyung-Bum Kim, Sang Bum Woo, Yoo Seob Song and Tae Hyun Sung
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Quan Wang: Department of Electrical Engineering, Hanyang University, Seoul 133-791, Korea
Kyung-Bum Kim: Department of Electrical Engineering, Hanyang University, Seoul 133-791, Korea
Sang Bum Woo: Department of Electrical Engineering, Hanyang University, Seoul 133-791, Korea
Yoo Seob Song: Department of Civil Engineering, The University of Texas Rio Grande Valley, Edinburg, TX 78539, USA
Tae Hyun Sung: Department of Electrical Engineering, Hanyang University, Seoul 133-791, Korea

Energies, 2021, vol. 14, issue 8, 1-14

Abstract: A piezoelectric sensor is a typical self-powered sensor. With the advantages of a high sensitivity, high frequency band, high signal-to-noise ratio, simple structure, light weight, and reliable operation, it has gradually been applied to the field of smart wearable devices. Here, we first report a flexible piezoelectric sensor (FPS) based on tungsten disulfide (WS 2 ) monolayers that generate electricity when subjected to human movement. The generator maximum voltage was 2.26 V, and the produced energy was 55.45 μJ of the electrical charge on the capacitor (capacity: 220 μF) when applying periodic pressing by 13 kg. The generator demonstrated here can meet the requirements of human motion energy because it generates an average voltage of 7.74 V (a knee), 8.7 V (a sole), and 4.58 V (an elbow) when used on a running human (weight: 75 kg). Output voltages embody distinct patterns for different human parts, the movement-recognition capability of the cellphone application. This generator is quite promising for smart sensors in human–machine interaction detecting personal movement.

Keywords: piezoelectric energy harvester; tungsten disulfide; flexible device; monolayer; human movement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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