Organic–inorganic hybrid perovskite solar cells,one of the most promising photovoltaic devices,have made great progress in their efficiency and preparation technology.In this study,uniform,highly conductive Li_(n)NiO...Organic–inorganic hybrid perovskite solar cells,one of the most promising photovoltaic devices,have made great progress in their efficiency and preparation technology.In this study,uniform,highly conductive Li_(n)NiO_(x)(0≤n≤1;0<x≤3)films were prepared by electrochemical deposition for a range of Li concentration.Photovoltaic performance for the perovskite solar cells was enhanced through incorporation of the ion pair of Ni^(3+)-Ni^(2+) as the interfacial passivation.Depending on the amount of lithium doping,controlled interfacial oxidation was induced by Ni^(3+).The Li_(0.32)NiO_(x)inhibited charge recombination,reduced the defect density,and enhanced the photocurrent density.A maximum power conversion efficiency of 20.44%was obtained by Li_(0.32)NiO_(x).Further,in the long-term,in-air stabilities of unencapsulated Li_(n)-NiO_(x) perovskite solar cells were demonstrated.展开更多
As a half-reaction to obtain high-efficiency and stable water-splitting,oxygen evolution reaction(OER)is a slow-kinetics process involving a four-electron(4e^-)transfer process and therefore requires catalysts to fast...As a half-reaction to obtain high-efficiency and stable water-splitting,oxygen evolution reaction(OER)is a slow-kinetics process involving a four-electron(4e^-)transfer process and therefore requires catalysts to fasten electron transfer.Here,we rationally optimized an interface material of ceria nanoparticles and nickel hydroxide by adsorbing ethylene glycol(EG-Ni(OH)2@CeO2),which produced ultrasmall nanosheets uniformly attached onto carbon cloth substrate.According to the characterization and density functional theory(DFT),the ethylene glycol-induced nickel–cerium interface had strong electron interaction,generating numerous of Ni^(3-δ)+active sites,reducing the energy reaction barrier,and promoting the electron-transport kinetics in the catalytic system.EG-Ni(OH)2@CeO2 showed excellent OER performance,with a low overpotential(335 m V)at 50 m A cm^-2 and a small Tafel slope(67.4 m V dec^-1).And the EG-Ni(OH)2@CeO2 also maintained stable for up to 60 h at 10,20,and 30 m A cm^-2.Overall,this research shows the significance of the interface engineering of metal materials based on organic-solvent adsorption to improve the electrocatalytic OER process.展开更多
基金This work was financially supported by the National Natural Science Foundation of China(No.11772207)the Natural Science Foundation of Hebei Province(Nos.A2019210204 and E2019210292)+1 种基金the Special Project of Hebei Provincial Central Government Guiding Local Science and Technology Development(No.216Z4302G)the Youth Top-notch Talents Supporting Plan of Hebei Province and the support of State Key Laboratory of Mechanics and Control of Mechanical Structures,Nanjing University of Aeronautics and Astronautics(No.MCMS-E-0519G04).
文摘Organic–inorganic hybrid perovskite solar cells,one of the most promising photovoltaic devices,have made great progress in their efficiency and preparation technology.In this study,uniform,highly conductive Li_(n)NiO_(x)(0≤n≤1;0<x≤3)films were prepared by electrochemical deposition for a range of Li concentration.Photovoltaic performance for the perovskite solar cells was enhanced through incorporation of the ion pair of Ni^(3+)-Ni^(2+) as the interfacial passivation.Depending on the amount of lithium doping,controlled interfacial oxidation was induced by Ni^(3+).The Li_(0.32)NiO_(x)inhibited charge recombination,reduced the defect density,and enhanced the photocurrent density.A maximum power conversion efficiency of 20.44%was obtained by Li_(0.32)NiO_(x).Further,in the long-term,in-air stabilities of unencapsulated Li_(n)-NiO_(x) perovskite solar cells were demonstrated.
基金financially supported by the National Natural Science Foundation of China(51762012 and 51862006)the Key Research and Development Project of Hainan Province(ZDYF2018106)the Research Unit of Island Emergency Medicine of Chinese Academy of Medical Sciences(2019RU013)。
文摘As a half-reaction to obtain high-efficiency and stable water-splitting,oxygen evolution reaction(OER)is a slow-kinetics process involving a four-electron(4e^-)transfer process and therefore requires catalysts to fasten electron transfer.Here,we rationally optimized an interface material of ceria nanoparticles and nickel hydroxide by adsorbing ethylene glycol(EG-Ni(OH)2@CeO2),which produced ultrasmall nanosheets uniformly attached onto carbon cloth substrate.According to the characterization and density functional theory(DFT),the ethylene glycol-induced nickel–cerium interface had strong electron interaction,generating numerous of Ni^(3-δ)+active sites,reducing the energy reaction barrier,and promoting the electron-transport kinetics in the catalytic system.EG-Ni(OH)2@CeO2 showed excellent OER performance,with a low overpotential(335 m V)at 50 m A cm^-2 and a small Tafel slope(67.4 m V dec^-1).And the EG-Ni(OH)2@CeO2 also maintained stable for up to 60 h at 10,20,and 30 m A cm^-2.Overall,this research shows the significance of the interface engineering of metal materials based on organic-solvent adsorption to improve the electrocatalytic OER process.
