Up-cycling petroleum waste into a high-performance yet sustainable triboelectric nanogenerator
The Big Yellow Sulfur Pile. Credit: Woongbi Cho A striking landmark in Vancouver, Canada, “The Big Yellow Sulfur Pile” is a testament to the massive amounts of elemental sulfur produced from the hydrodesulfurization process of petroleum refining. In 2013, Prof. Pyun’s group from the University of Arizona developed inverse vulcanization, a method to synthesize a