Title: Polyoxometalate (POM) redox system-mediated electro-chemical method for biomass energy conversion
Reporter: Distinguished Professor Wei Liu, Central South University
Time: April 26, 2021 at 3:00 pm
Location: Room 304, Block B, Physics Building
Organizers: Provincial Key Laboratory of Photovoltaic Materials, Topological Functional Materials Research Center
Abstract
Polyoxometallates (POMs) are considered to be soluble nano-metal oxides with good redox properties and photocatalytic activity. This report will introduce the POMs redox system used in the electro-chemical conversion of biomass renewable energy, including: (1) POMs-mediated direct biomass fuel cell. The battery uses POMs as catalysts and charge transfer carriers in the anode. Under the action of sunlight or heat, raw biomass (such as leaves, switchgrass and shrub leaves) that have not been chemically treated can be used as fuel to generate electricity. Power density It can reach ~50mW/cm2. (2) POMs redox system is used to directly electrolyze natural biomass to produce hydrogen. Compared with the traditional method of electrolyzing water to produce hydrogen, direct biomass electrolysis can save up to 84% of the electricity consumption, which is a promising method of hydrogen production. (3) The POM-Pt/C dual catalyst system converts biomass pyrolysis oil into saturated hydrocarbon fuel in the electrochemical hydrodeoxygenation reaction. The catalyst system realizes electrolysis with high current density (100-800 mA cm -2) and has high Faraday efficiency (99-80%), which solves the problem of low current efficiency in traditional electrochemical hydrogenation reactions. More importantly, we found that the dual-catalyst system has the function of "hydrogen buffering", which realizes the deoxygenation reaction that is generally considered to be difficult to carry out under low temperature (<100oC) catalysis, and can efficiently convert the oxygen-containing derivatives of biomass into Saturated hydrocarbon fuel.
Introduction
Wei Liu, Distinguished Professor of Central South University, graduated from the Georgia Institute of Technology (Georgia Institute of Technology) with a Ph.D., and did post-doctoral research at Texas A&M University (Texas A&M University). The research field is the electro-chemical conversion of biomass energy mediated by polyoxometalate. Published multiple articles as the first author in international journals such as Nature Energy, Nature Comm., Angew. Chem (VIP articles), EES (2 articles) and ChemSusChem (cover article), with 1,521 citations, h-index 19, i10 -index 30, co-authored 1 English monograph. Authorized 2 Chinese patents and 1 PCT patent. Proposed a low-temperature direct biomass fuel cell catalyzed by polyoxometallates, which has attracted widespread attention at home and abroad. It has been reported by nearly 50 newspapers, websites, media and radio stations in the United States, and has been reprinted and published by major language countries such as China, Japan, and France. Report. The domestic Xinhua News Agency, People's Daily Online and Science Net reported the results in detail.