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Sensors 2020, 20, x FOR PEER REVIEW 5 of 14 Figure 3a–h are CV curves of different types of friction layers at a scan rate of 20–500 mV s−1. It can be seen from each CV curve that when the sweep speed is lower than 200 mV s−1, each friction layer has an obvious redox reaction peak. This is most obvious in the friction layer with the addition Sensors 2020, 20, 506 5 of 14 of PA6. After adding PVDF and BaTiO3, it has a certain inhibitory effect on the redox peak. Ipc/Ipa ≈ 1 is obtained by calculation, which indicates that the whole cycle process is close to stable. However, dwuheertoe mtheisinthtermnalsrseosfisthaencaectoivfeasuchbsftraicntcioenonlatyheer,ealescmtroadllea,ms iosutnhteovfoletagkeagsecacnunrirnegntraisteg,e∆nVeriastethde, wpohtiecnhtiaslsdlirgohpt dinevthiaetiwonhofrleomcycthleaidnedaVl staistet.hAe tlothweesatmvoeltaimge,inthtehsemcyocolteh. and non-virtual CV curve 0 also shows that each friction layer has good electrochemical stability. As the sweep speed increases, Table 1. Specific capacitance values of different friction layers at different scanning rates. the redox peak gradually shifts until it disappears, because the scan rate is too fast to react. The corresponding specific capacitance value is obtained by calculating the area of the CV curve. Reagent Cel Cel + PA6 Cel + PA6 + Cel + PVDF Cel + PVDF Figure 3i and Tabl−e1 1 show that the specific capacitance of theBfarTiciOtion layer changes grea+tlByaTaifOter the ScanRate(mvs ) 3 3 addition of PA6, PVDF and BaTiO3. Specifically, after adding PA6, the specific capacitance of the 20 66.225 77.896 67.252 65.509 65.293 50 57.928 −1 69.077 53.678 56.498 55.491 −2 frictionlayerisgreatlyincreased.At20mVs ,thespecificcapacitanceincreasedfrom66.225mFcm 80 52.807 64.34 48.245 50.942 49.077 to 77.896 mF cm−2, which is increase by 1.176 times. At a sweep speed of 500 mV s−1, the specific 100 50.057 61.642 45.053 47.768 44.318 capacitance increased from 28.156 mF cm−2 to 39.212 mF cm−2, which is increase by 1.393 times. Due 200 42.004 53.631 36.545 39.974 36.716 300 36.112 47.611 30.721 34.529 32.986 to the certain redox reaction and the internal ion migration rate of each friction layer, the specific 400 31.625 42.921 26.148 30.301 30.953 capacitance cannot increase with the increase of the scanning rate as the sweep speed increases, and 500 28.156 39.212 22.654 27.078 29.488 the capacitance value of each friction layer decreases. On this basis, the friction layer is greatly reduced in specific capacitance after the addition of BaTiO3. At 20 mV s−1 sweep speed, the specific Figure 3a–h are CV curves of different types of friction layers at a scan rate of 20–500 mV s−1. capacitance is reduced from 77.896 mF cm−2 to 67.252 mF cm−2, which is reduced to 0.863 times. At It can be seen from each CV curve that when the sweep speed is lower than 200 mV s−1, each friction 500 mV s−1 sweep speed, the specific capacitance decreased from 39.212 mF cm−2 to 22.654 mF cm−2, layer has an obvious redox reaction peak. This is most obvious in the friction layer with the addition of which is reduced to 0.578 times. After adding PVDF, the specific capacitance of the friction layer is PA6. After adding PVDF and BaTiO , it has a certain inhibitory effect on the redox peak. I /I ≈ 1 is −1 3 −2 pcpa−2 reduced. At 20 mV s , the specific capacitance decreases from 66.225 mF cm to 65.509 mF cm , obtained by calculation, which indicates that the whole cycle process is close to stable. However, due which is reduced to 0.989 times. At a sweep speed of 500 mV s−1, the specific capacitance decreases to the internal resistance of each friction layer, a small amount of leakage current is generated, which from 39.212 mF cm−2 to 27.078 mF cm−2, which is reduced to 0.962 times. On this basis, after adding is slight deviation from the ideal state. At the same time, the smooth and non-virtual CV curve also BaTiO3, the friction layer ratio is reduced at low sweep speed. At 20 mV s−1, the specific capacitance shows that each friction layer has good electrochemical stability. As the sweep speed increases, the decreases from 66.225 mF cm−2 to 65.293 mF cm−2, which is reduced to 0.997 times. At 500 mV s−1, the redox peak gradually shifts until it disappears, because the scan rate is too fast to react. specific capacitance increases from 27.078 mF cm−2 to 29.488 mF cm−2, which increases by 1.089 times. Figure 3. CV curve and specific capacitance curve of different types of friction layer: (a) 20 mV s−1, (b) 50 mV s−1, (c) 80 mV s−1, (d) 100 mV s−1, (e) 200 mV s−1, (f) 300 mV s−1, (g) 400 mV s−1, (h) 500 mV s−1, (i) specific capacitance.PDF Image | Green Triboelectric Nano-Generator Composite of Degradable Cellulose, Piezoelectric Polymers of PVDF PA6
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