Less than a month two \”Science\”! User: ……
Just a few days ago summed up Professor Sargent 2020 1 year ago, progress in February (link: shock only two months, published a Science, more than 10 sub-Journal / AM / JACS- Canada academicians Professor Sargent achievement highlights! ). Legend still going on, 7 February to March 6, less than a month, Sargent recurrence \”Science\”, perovskite micron was treated by whole cell and the top silicon heterojunction textured bottom cell combined dual-stack cell composition, 25.7% efficiency breakthrough, capable of withstanding 400 hours at the maximum power point 85 ℃ thermally stable tracking test and 40 ° C 400 hours test, no attenuation performance. User: Most people half a lifetime achievement, he did two months …… March 6 \”Science\” high efficiency tandem solar cell efficiency breakthrough 25.7%! The solar cell having a smaller bandgap stacked to form a double conjunctiva, expected to overcome the single-junction photovoltaic cell Shockley-Queisser limit. The rapid development of a solid solution of perovskite brought a perovskite single-junction efficiency of> 20%. However, this process has not been associated with industry can be textured crystalline silicon solar cell for monolithic integration. University of Toronto, Canada, Edward H. Sargent Academy of Sciences and King Abdullah University of Science and Technology Stefaan De Wolf cooperation , perovskite micron top of the battery was treated with a full texture crystalline silicon hetero-junction bottom cell combined to form dual-stack battery. Papers related to \”Efficient tandem solar cells with solution-processed perovskite ontextured crystalline silicon\” in the title, today published in \”Science\”. To overcome the challenges micron perovskite charge collection, the depletion width at the bottom of the TF silicon pyramid tripled. Further, by limiting the self-passivating agents (butanethiol) was immobilized on the surface of perovskite, and further increase the length of the diffusion suppressing phase separationfrom. These combined enhancements perovskite silicon tandem solar cell independent certification power conversion efficiency of 25.7%. These devices can be subjected to a thermal stability test for 400 hours at 85 ° C, and the maximum power point tracking at 40 ° C 400 hours, the performance loss is negligible.
6 February , Science: a record rate, theis converted to ethylene!
electrolysis catalytic CO 2 reduction of CO, and multi-carbon organic matter is expected to alleviate the current energy crisis and the growing prominence of environmental issues. General electrolysis catalyst device needs to be provided in an aqueous solution by the electrolysis of water to organic carbon multiple proton, which led to a serious problem: CO 2 in an aqueous solution diffusion poor ability (diffusion in alkaline solution length of only several tens of nanometers), thus resulting in a low current density electrolysis (<100 mA cm -2 ) and a low energy conversion efficiency, at the same time, since the catalytic reaction in the electrolytic gas (CO 2 ) – the solid (catalyst) – liquid (electrolyte) complex three-phase zone, a hydrophilic layer may be corroded catalyst activity at high alkaline electrolyte into the environment, resulting in increased catalytic activity and decreasing hydrogen evolution reaction. Based on this, the University of Toronto Professor Edward H. Sargent joint team Professor David Sinton team design of the capable of decoupling the gas ions and electrons metalliferous – electrolytic ionic polymer composite catalytic system (CIBH) , the electrolysis CO.\’s 2 when preparing a multi-carbon compound current density exceeds 1 A cm -2 , for the current the highest value reported. Selection of with hydrophilic -SO 3 – group and a hydrophobic -CF 2 Poly-perfluorosulfonic acid group (a PFSA) coated on this catalyst surface is achieved CIBH structure , a hydrophilic group of the surface of the coating layer so as to contact the catalyst with the electrolyte solution sufficiently wetted contact proton conducive generating, while the interior of the channel is advantageous for the hydrophobic CO 2 of the transmission. The results showed that only the thickness of the coating layer can be made of 5-10nm CO 2 to to enhance the diffusion length of nearly 400-fold , to the micron level. The structures were applied to the group of Ag and Cu catalysts were CO 2 prepared by reduction of CO, Ag-CIBH Cu-CIBH and current density, respectively, of the catalytic system can reach 400 m Acm -2 [ 123], and 340 m Acm -2 , while the original current density of Ag and Cu catalysts were only 54 mA cm -2 and 64 mA cm -2 . On this concept, the design of the 3D Cu- CIBH catalyst system, in 7M KOH electrolyte CO 2 the flow rate reached 50 cm 3 min -1 , the maximum current density of 1.32 a cm -2 , the cathode to improve the energy efficiency by 45%, this technique greatly enhance the catalytic electrolysis CO 2 preparation of multi carbon organics its feasibility iNDUSTRIAL ( \”Science\”: a record rate, the carbon dioxide is converted to ethylene !). Author Professor Edward H. Sargent, vice president of the University of Toronto, the Royal Canadian Academy of Sciences, Canadian Academy of Engineering, Ministry of Science and president of the Canadian branch of nanotechnology, InVisage Technologies founder , Xagenic co-founder, AAAS Fellow, IEEE Fellow, ACS Photonics deputy editor. Professor Edward H. Sargen is material and photonics neighborhood world-renowned scientists, semiconductor solar in its soluble phase processOutstanding contribution to the photodetector cells and studies made elected Fellow of the AAAS; because of its contribution to the research colloidal quantum dot optoelectronic devices made elected Fellow of the IEEE; its use in the preparation of the full spectrum of the quantum confinement material solar cells and ultra-sensitive light detectors contribution made by the study, was elected Canadian Academy of Engineering. Professor Edward H. Sargen published in Nature and Science and other top international journals multiple papers, are currently already quoted more than 61,894 times (Google data), of which 100 citations of papers more than 100 times. Original link: https: //science.sciencemag.org/content/367/6478/661https: //science.sciencemag.org/content/367/6482/1135