Projektdarstellungen auf der Webseite

Jedes von der Gebert Rüf Stiftung geförderte Projekt wird mit einer Webdarstellung zugänglich gemacht, die über die Kerndaten des Projektes informiert. Mit dieser öffentlichen Darstellung publiziert die Stiftung die erzielten Förderresultate und leistet einen Beitrag zur Kommunikation von Wissenschaft in die Gesellschaft.


Solar-Bio Fuels


The project management is responsible for the content of the information provided.


This project is one of the seven winners of the call 2019 «Microbials – Direct Use of Micro-Organisms». Project partners: RCAST, University of Tokyo; WNLO, Huazhong University of Science and Technology.


  • Projekt-Nr: GRS-080/19 
  • Förderbeitrag: CHF 287'000 
  • Bewilligung: 30.10.2019 
  • Dauer: 03.2020 - 12.2022 
  • Handlungsfeld:  Microbials, seit 2016



High concentration of atmospheric CO2 and energy crisis are two of the major challenges facing our human beings nowadays. One promising technology to tackle these challenges is the solar-driven conversion of CO2 to fuels and chemicals, known as artificial photosynthesis. In this project, we will develop systems which integrate photovoltaics, electrolyzers and fermenters together to convert CO2 to alcohol fuels with solar radiation as the only energy input. Perovskites photovoltaics will be employed to produce renewable electricity that is used for the generation of syngas via electrolysis. The syngas will be introduced to the fermenters containing microorganism such as C. autoethanogenum and C. kluyveri to produce alcohol fuels. This fermentation process also serves as an effective separation technique by converting gas products to liquid fuels. The entire system is expected to have remarkable energy efficiency, high production rate and robustness. We expect to achieve 10% solar energy to chemical energy efficiency for the conversion of CO2 to alcohol fuels. At the end of the project, the technology readiness level (TRL) is expected to be at 4-5 and we will explore the potential for upscaling towards TW-scale by 2050.

Was ist das Besondere an diesem Projekt?

Solar-driven CO2 reduction to alcohols have been studied in photocatalysis and photo-electrochemistry. However, the energetic efficiency is far from satisfactory. Here, we employ microorganism to convert syngas to alcohol products to circumvent the energy barrier required for the direct reduction of CO2 to alcohol fuels. This innovative tandem electro-bio method will enable exceptionally high energetic efficiency. Moreover, our system will be only dependent on earth abundant materials and will employ the new-generation photovoltaics based on perovskites. These new aspects will not only push the efficiency to a new level, but also bring chemists and microbiologist together to address our concerns on energy crisis and climate change.


We have designed efficient electrocatalysts for the respective synthesis of hydrogen (H2) and carbon monoxide (CO) from water splitting and carbon dioxide (CO2) reduction. After optimizing key components in the electrolyzers, remarkable electricity-to-fuel energy conversion efficiencies for H2 and CO were achieved on newly-developed catalysts. Additionally, by engineering the configuration of organic-inorganic halide perovskite solar cells, we have achieved an efficient solar-to-electricity conversion which were further used to power water splitting and CO2 reduction. The combined photovoltaic-electrolyzer systems illuminated under standard AM 1.5G sunlight, without applying any external bias, delivered a remarkable conversion efficiency of 12.9% for solar-to-H2 and a new record of 19.7% for solar-to-CO conversion, respectively. Research activities on microorganism cultivation are now still ongoing to achieve final alcohols generation by feeding produced syngas and using renewable solar energy as the only input power.


Nature Communications, 2022, 13, 5898


Am Projekt beteiligte Personen

Dr. Jing Gao, project leader, Laboratory of Photonics and Interfaces, EPFL, Lausanne
Prof. Michael Grätzel, member of steering committee, Laboratory of Photonics and Interfaces, EPFL, Lausanne
Meng Xia, phD candidate, Laboratory of Photonics and Interfaces, EPF Lausanne

Letzte Aktualisierung dieser Projektdarstellung  18.03.2024