EFFECT OF THE DIRECTION OF THE MAGNETIC FIELD LINES ON THE VOLTAGE OUTPUT OF A TRIBOELECTRIC NANOGENERATOR

Document Type : Original Article

Abstract

The present work investigates the effect of the direction of the magnetic field lines on the voltage output of a triboelectric nanogenerator (TENG). The effect of the permanent magnets on generation of ESC depends on the field lines relative to the triboelectrified area. The present work studies the optimal position of the permanent magnets relative to the tested area. The voltage difference between the friction surfaces of polytetrafluoroethylene (PTFE) and polyamide textile was measured after contact-separation and sliding.
 
Based on the experimental results, it was found that voltage increased up to maximum then decreased with further increase of the field strength when the substrate was paper sheet.  The maximum voltage value was observed at certain field strength depending on the efficiency of the influence of the magnetic field on the contact area. Voltage increase was attributed to the ability of the Al electrode to cut perpendiculary the lines of a magnetic field and induce extra voltage. In contradiction to that, the sliding in the direction parallel to the field lines generated lower voltage values. Higher voltage values was displayed for rabbit fur sliding on PP than that measured for PTFE sliding on PA. Finally, it is recommended to select the proper position of the magnet to harvest the highest voltage values. The present work determined the optimal position of the permanent magnets relative to the sliding direction to get the highest voltage. This condition was realized when the moving electrode cut perpendiculary the maximum number of the lines of the magnetic field.

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