The Swedish Consortium for Artificial Photosynthesis is a collaborative research environment with the purpose of advancing the science and utilization of solar fuels - fuel from solar energy. We bring together leading scientists with expertise in a broad range of disciplines within chemistry, physics and biology. Together we do fundamental and applied research, developing solutions for a sustainable future.
Time: 9-13:00, Place: Ångström lab. For agenda see: News&Events
Consortium meetings are again in-person!
CAP meetings are once again held in-person ! Unless otherwise stated, the monthly CAP meeting will be in the seminar room on Floor 2, in the Ångström lab House 7. Check our News and Events page or our events calendar every now and then, to see what's next.
Alina Sekretareva awarded the Gustafsson prize in physics
The Göran Gustafsson prize in physics at Uppsala university is awarded to the CAP member Alina Sekretareva. Her research is focused on understanding of electron transfer processes within (bio)electrocatalysts and on the electrode/catalyst interface at the molecular level and on the exploration of novel concepts for electrocatalytic devices based on this new understanding. The prize is a research grant of 2,75 MSEK.
Read more on the home page of the Göran Gustafssons stiftelse (Swedish).
Peafowl Plasmonics raises 40 MSEK
In seed round led by Industrifonden and the Wallenberg fund Navigare Ventures, the startup company Peafowl Plasmonics, founded by the CAP member Jacinto Sá, has raised enough capital to take the company to the next level.
Read about it here (in Swedish): Peafowl Plasmonics har tagit fram genomskinliga solceller (di.se)
April 2022: Sicong Wang, Bin Cai and Haining Tian published an article in Angewandte Chemie:
Abstract: A photocatalyst comprising binary organic polymer dots (Pdots) was prepared. The photocatalyst produces H2O2 in alkaline conditions (1 M KOH) with a production rate of up to 188 mmol h−1 g−1. The external quantum efficiencies were 30 % (5 min) and 14 % (75 min) at 450 nm. Furthermore, photo-oxidation of methanol by Pdots, followed by a disproportionation reaction and an oxidation reaction, produced the high-value chemical formate. On the basis of various spectroscopic and electrochemical measurements, the photophysical processes of the system were studied in detail and a reaction mechanism was proposed.
March 2022: Ashleigh T. Castner, Hao Su, Erik Svensson Grape, A. Ken Inge, Ben A. Johnson*, Mårten S. G. Ahlquist*, and Sascha Ott* published an article in Journal of the American Chemical Society:
Abstract: Electron transport through metal–organic frameworks by a hopping mechanism between discrete redox active sites is coupled to diffusion-migration of charge-balancing counter cations. Experimentally determined apparent diffusion coefficients that characterize this form of charge transport thus contain contributions from both processes. While this is well established for MOFs, microscopic descriptions of this process are largely lacking. Herein, we systematically lay out different scenarios for cation-coupled electron transfer processes that are at the heart of charge diffusion through MOFs. We show that in the PIZOF-type MOF, Zr(dcphOH-NDI), specific cation–linker interactions can open pathways for concerted cation-coupled electron transfer processes that can outcompete limitations from reduced cation flux.
March 2022: Marco Lorenzi, Pierre Ceccaldi, Patricia Rodríguez‑Maciá, HollyJayne Redman, Afridi Zamader, James A. Birrell, Livia S. Mészáros, and Gustav Berggren published an article in Journal of Biological Inorganic Chemistry:
Abstract: Hydrogenases are metalloenzymes that catalyze the reversible oxidation of molecular hydrogen into protons and electrons. For this purpose, [FeFe]-hydrogenases utilize a hexanuclear iron cofactor, the H-cluster. This biologically unique cofactor provides the enzyme with outstanding catalytic activities, but it is also highly oxygen sensitive. Under in vitro conditions, oxygen stable forms of the H-cluster denoted H(trans) and H(inact) can be generated via treatment with sulfde under oxidizing conditions. Herein, we show that an H(trans)-like species forms spontaneously under intracellular conditions, concurrent with the cells ceasing H2 production. Formation of the observed H(trans)-like species is influenced by both steric factors and proton transfer, underscoring the importance of outer coordination sphere effects on H-cluster reactivity.
Abstract: Cyanobacteria are natural photosynthetic microbes which can be engineered for sustainable conversion of solar energy and carbon dioxide into chemical products. Attempts to improve target production often require an improved understanding of the native cyanobacterial host system. Valuable insights into cyanobacterial metabolism, biochemistry and physiology have stimulated key advancements of cyanobacteria as cell factories for production. In the present review, we summarize the current progress in engineering cyanobacteria and discuss the achieved and potential utilization of these advances in cyanobacteria for the production of the bulk chemicals isobutanol and 1-butanol.
Abstract: The mechanism by which proton-coupled electron transfer (PCET) occurs is of fundamental importance and has great consequences for applications, e.g. in catalysis. However, determination and tuning of the PCET mechanism is often non-trivial. Here, we apply mechanistic zone diagrams to illustrate the competition between concerted and stepwise PCET-mechanisms in the oxidation of 4-methoxyphenol by Ru(bpy)3 -derivatives in the presence of substituted pyridine bases. For the first time, we provide direct experimental evidence, that the vibronic coupling strength affects the switching point between CEPT and ETPTlim, i.e. at what driving force one or the other mechanism starts dominating. Implications for solar fuel catalysis are discussed.
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Last updated June 20, 2022