Chem 278 Prof. Song Jin

Seminar series
Inorganic Chemistry
Wed, Feb 26 4:30pm
Molecular Sciences 3440
Speaker Song Jin
University of Wisconsin-Madison
Department of Chemistry

Abstract: Due to the intermittent nature of most renewable energy sources (such as solar and wind), practical large scale renewable energy utilization demands both efficient energy conversion and large scale energy storage or alternative usage. Earth-abundant but highly active and selective electrocatalysts are needed to enable efficient and sustainable production of energy using electrocatalytic and photoelectrochemical (PEC) energy conversion. We developed earth-abundant electrocatalysts, such as exfoliated nanosheets of MoS2 and ternary pyrite-type cobalt phosphosulfide (CoPS), for highly efficient hydrogen evolution reaction (HER). The increasingly affordable renewable electricity can also drive the electrochemical production of value-added chemicals, such as biomass-derived molecules and hydrogen peroxide (H2O2). I will highlight our recent work on combining computations and experiments to demonstrate cobalt pyrite (CoS2) as a selective catalyst for two-electron oxygen reduction reaction (2e- ORR) to produce H2O2. We have integrated these earth-abundant electrocatalysts rationally with efficient semiconductor materials to demonstrate efficient photoelectrochemical hydrogen generation systems. We also developed high performance hybrid solar-charged storage devices that integrate photoelectrochemical solar cells and redox flow batteries (RFBs). In these integrated solar flow batteries (SFBs), solar energy is absorbed by semiconductor electrodes to directly charge up the redox couples without external electric bias; which can be discharged to generate the electricity when needed.