Heinz Frei Archives - Biosciences Area

Nature-Inspired Green Energy Technology Clears Major Development Hurdle

March 19, 2020

Heinz Frei, a senior scientist in Biosciences’ Molecular Biophysics and Integrated Bioimaging (MBIB) Division, seeks to engineer devices that emulate photosynthesis – the sunlight-driven chemical reaction that green plants and algae use to convert carbon dioxide (CO2) into cellular fuel. If the necessary technology could be refined past theoretical models and lab-scale prototypes, this idea, known as artificial photosynthesis, has the potential to generate large sources of completely renewable energy using the surplus CO2 in our atmosphere.

Frei’s team has developed an artificial photosynthesis system, comprised of nanosized tubes, that appears capable of performing all the key steps of the fuel-generating reaction. Their latest paper, published in Advanced Functional Materials, demonstrates that their design allows for the rapid flow of protons from the interior space of the tube, where they are generated from splitting water molecules, to the outside, where they combine with CO2 and electrons to form the fuel. Fast proton flow is essential for efficiently harnessing sunlight energy to form a fuel.

Ultrathin Membrane Both Isolates and Couples Living and Non-Living Catalysts

June 26, 2018

Biosciences researchers have developed a novel nanoscale membrane embedded with molecular wires that simultaneously chemically isolates, yet electrochemically couples, a microbial and an inorganic catalyst on the shortest possible length scale. This new modular architecture, described in a paper recently published in Nature Communications, opens up a large design space for building scalable biohybrid electrochemical systems for a variety of applications.

A Core−Shell Nanotube Array for Artificial Photosynthesis

April 11, 2018

“The key design principle of natural photosynthesis is the closing of the photosynthetic cycle on the shortest possible length scale under membrane separation of the incompatible water oxidation and proton reduction environments,” said Heinz Frei, a senior scientist in Biosciences’ Molecular Biophysics and Integrated Bioimaging (MBIB) Division. With collaborators Eran Edri, a former postdoctoral fellow in MBIB now at Ben-Gurion University, and Shaul Aloni in the Molecular Foundry Division, Frei developed a fabrication method to make a square-inch sized artificial photosystem, in the form of an inorganic core-shell nanotube array, that implements this design principle for the first time. The method was described in a paper published earlier this year in ACS Nano.

Crucial Surface Intermediate for Photocatalytic CO2 Reduction Identified

March 9, 2018

Catalytic carbon dioxide (CO₂₎ reduction is an important technology for the production of fuels and chemicals. Mechanistic studies have suggested that both electro- and photocatalytic approaches may share a common intermediate: a carbon dioxide radical anion (CO₂^–) bound to the catalyst’s surface. Now, using rapid-scan Fourier-transformed infrared spectroscopy in combination with isotopic labelling, Heinz Frei, a senior scientist in Molecular Biophysics and Integrated Bioimaging (MBIB), and colleagues have identified a carbon dioxide dimer radical anion (C₂O₄^–) as the crucial surface intermediate during the photocatalytic reduction of CO₂ on copper nanoparticles. Although recent electrochemical investigations have suggested the existence of this one-electron surface intermediate, this study, published in the Journal of the American Chemical Society (JACS), provides the first direct experimental evidence. Read more in this Nature Catalysis research highlight.

Biosciences Area FY17 LDRD Projects

February 2, 2017

The projects of 13 Biosciences Area scientists and engineers received funding through the FY17 Laboratory Directed Research and Development (LDRD) program. The funded projects cover a broad range of topics including the study of microbiomes in relation to their environment, plants, and gut health; catalysis for solar conversion to energy; and genomic expression in tissue. Among them were three projects related to Lab-wide initiatives. Together, these efforts account for 17.5% of the $25.2 million allocated. Lab-wide, a total of 88 projects were selected from a field of 166 proposals.

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