New high-performance triboelectric materials fabricated from by-products of petroleum refining process | 6/24/2019 | Staff
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Triboelectric generation is an energy harvesting technique that generates electricity through induction of triboelectric effects using discarded physical energy. Materials employed to triboelectric generators (TEG) are classified positive or negative according to their value of electron affinity; negative materials generally employ fluorinated carbon-based polymers. Yet, most of the research for improving TEG performance focus mainly on structural improvements of device such as the multi-layer device structures, testing triboelectricity in a vacuum condition, and asymmetric device design rather than the development of novel polymeric materials.

Fluorinated carbon-based polymers (i.e. PTFE) are employed as highly negative triboelectric materials due to the high electron affinity of their halogens while carbon-backbones limit triboelectric performance due to low electron affinity of the carbon. Herein, we introduce, for the first time, fluorinated sulfur-based polymer as extremely negative triboelectric material for improvement of triboelectric performance. Sulfur can combine with fluorine more than carbon, up to two more, through an expanded octet using empty d orbital. It also has the highest electron affinity except halogens, gold and platinum. Hence, when sulfur is employed as the...
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