报告内容摘要

The scale of renewable energy challenges not only calls for highly efficient but also abundant, inexpensive, and robust materials. However, significant challenges in material performance, bulk and interface defects, and controlled doping and physical properties must be overcome before the potentials of earth-abundant materials can be fulfilled. New semiconductors for efficient light harvesting and charge separation, and highly active electrocatalysts must be discovered to enable the most efficient and sustainable production of energy using solar cells and photoelectrochemical (PEC) water splitting cells. We have comprehensively elucidated the intrinsic defects in earth-abundant iron pyrite (FeS2) semiconductor and conclusively explained the origin of its poor solar performance, which will enable the rational improvement of its solar performance. We also report several new earth-abundant electrocatalysts for the hydrogen evolution reaction (HER) and significantly enhanced their catalytic performance. By controlling the nanostructures and polymorphs of layered metal chalcogenide MS2 (M = Mo, W) materials and metallic cobalt pyrite (CoS2), we significantly enhanced their catalytic activity for HER. We further established ternary pyrite-type cobalt phosphosulfide (CoPS) as the best earth-abundant HER catalyst to date that does not contain expensive noble metals. Nanostructured CoPS can achieve catalytic activity for HER very close to that of platinum with outstanding long-term operation stability. These earth-abundant HER catalysts have been integrated with semiconductors to enable the most efficient solar-driven hydrogen generation devices using earth-abundant materials.

报告人简介

Song Jin is the professor of chemistry at the University of Wisconsin-Madison. He received his PhD. in 2002 from Cornell University under the direction of Prof. Francis J. DiSalvo and carried out his postdoctoral research under the direction of Prof. Charles M. Lieber at Harvard University. Prof. Jin is interested in the chemistry and physics of nanoscale materials and solid state materials and their applications, especially in renewable energy. Prof. Jin developed innovative synthesis of a variety of nanomaterials including metal silicides, oxides and chalcogenides, and developed fundamental understanding of screw dislocation-driven growth of nanomaterials in the context of crystal growth theory. Building on the understanding of novel physical properties, Jin advances the interdisciplinary exploitation of (nano)materials for photovoltaic and photoelectrochemical solar energy conversion, thermoelectric energy conversion, energy storage, nanospintronics, and biotechnology

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