Perovskite is rising as the most promising material for the next generation of solar cells,due to its high efficiency,low cost,and convenient fabrication.However,the stability of perovskite solar cells remains to be a...Perovskite is rising as the most promising material for the next generation of solar cells,due to its high efficiency,low cost,and convenient fabrication.However,the stability of perovskite solar cells remains to be a challenge towards large-scale application.Perovskite materials play a key role in improving the stability of PSCs,and tremendous efforts have been committed to stabilizing the perovskite materials,including composition regulation,crystallization control,and interface optimization.Herein we review the state-of-the-art strategies to improve the stability of perovskite layers in PSCs,and important strategies are highlighted.We analyze in-depth the influence of each site ion on perovskite structural stability and summarize the important progress of these structures showing superior stability.We then summarize the use of additives to regulate perovskite crystallization and defect passivation and elaborate the related mechanisms.Furthermore,the pros and cons of different interface treatment methods used in perovskite solar cells are discussed。展开更多
Developing highly efficient,cost-effective,and stable electrocatalysts for hydrogen evolution reaction(HER)is of considerable importance but remains challenging.Herein,we report the fabrication of a robust Ru-based el...Developing highly efficient,cost-effective,and stable electrocatalysts for hydrogen evolution reaction(HER)is of considerable importance but remains challenging.Herein,we report the fabrication of a robust Ru-based electrocatalyst,which comprises heterostructured Ru-Ru_(2)P nanoparticles that are embedded in the N,P-codoped carbon nanofibers(CNFs),through a synthetic strategy involving electrospinning and temperature-controlled pyrolysis treatment.The as-prepared Ru-Ru_(2)P catalyst(Ru-Ru_(2)P@CNFs)shows excellent HER catalytic activities with low overpotentials of 11 and 14 mV in acidic and alkaline media,respectively,to achieve a current density of 10 mA cm^(−2),which are superior to the individual components of pure Ru and Ru_(2)P catalysts.Density functional theory calculations demonstrate the existence of electronic coupling effect between Ru and Ru_(2)P at the heterointerfaces,leading to a well-modulated electronic structure with optimized hydrogen adsorption strength and enhanced electrical conductivity for efficient HER electrocatalysis.In addition,the overall synthetic strategy can be generalized for the synthesis of a series of transitional metal phosphide-based nanofibers,thereby holding a remarkable capacity for various potential applications.展开更多
基金supported by the National Key Research and Development Program of China (2021YFA0715502)the National Natural Science Foundation of China (61935016, 92056119, and 22175118)+1 种基金the Double First-Class Initiative Fund of Shanghai Tech Universitythe Science and Technology Commission of Shanghai Municipality (20XD1402500 and 20JC1415800)
文摘Perovskite is rising as the most promising material for the next generation of solar cells,due to its high efficiency,low cost,and convenient fabrication.However,the stability of perovskite solar cells remains to be a challenge towards large-scale application.Perovskite materials play a key role in improving the stability of PSCs,and tremendous efforts have been committed to stabilizing the perovskite materials,including composition regulation,crystallization control,and interface optimization.Herein we review the state-of-the-art strategies to improve the stability of perovskite layers in PSCs,and important strategies are highlighted.We analyze in-depth the influence of each site ion on perovskite structural stability and summarize the important progress of these structures showing superior stability.We then summarize the use of additives to regulate perovskite crystallization and defect passivation and elaborate the related mechanisms.Furthermore,the pros and cons of different interface treatment methods used in perovskite solar cells are discussed。
基金financially supported by the Natural Science Foundation of Zhejiang Province (LQ20B030001 and LY20E020002)China Postdoctoral Science Foundation (2021M702305)。
文摘Developing highly efficient,cost-effective,and stable electrocatalysts for hydrogen evolution reaction(HER)is of considerable importance but remains challenging.Herein,we report the fabrication of a robust Ru-based electrocatalyst,which comprises heterostructured Ru-Ru_(2)P nanoparticles that are embedded in the N,P-codoped carbon nanofibers(CNFs),through a synthetic strategy involving electrospinning and temperature-controlled pyrolysis treatment.The as-prepared Ru-Ru_(2)P catalyst(Ru-Ru_(2)P@CNFs)shows excellent HER catalytic activities with low overpotentials of 11 and 14 mV in acidic and alkaline media,respectively,to achieve a current density of 10 mA cm^(−2),which are superior to the individual components of pure Ru and Ru_(2)P catalysts.Density functional theory calculations demonstrate the existence of electronic coupling effect between Ru and Ru_(2)P at the heterointerfaces,leading to a well-modulated electronic structure with optimized hydrogen adsorption strength and enhanced electrical conductivity for efficient HER electrocatalysis.In addition,the overall synthetic strategy can be generalized for the synthesis of a series of transitional metal phosphide-based nanofibers,thereby holding a remarkable capacity for various potential applications.
