We report on broadband infrared emission of bismuth-doped RO-B2O3（R=Ca, Sr, Ba） glasses. Glass samples are prepared under various conditions by a conventional melting-quenching method and the luminescence properties...We report on broadband infrared emission of bismuth-doped RO-B2O3（R=Ca, Sr, Ba） glasses. Glass samples are prepared under various conditions by a conventional melting-quenching method and the luminescence properties in infrared wavelength region are investigated. No apparent infrared luminescence is observed in the SrO-B2O3 and BaO-B2O3 prepared in air, while glasses prepared in reducing atmosphere exhibit a broadband infrared luminescence peaking at 1 300 nm with a full width at half maximum（FWHM） of about 200 nm when excited by an 800 nm laser diode. A mechanism was proposed to explain the observed phenomena. The presence of low valence bismuth, probably Bi^＋, is responsible for the broadband infrared emission.展开更多
Nd∶NBW laser crystal with the size of Φ8 mm×20 mm was grown by the process of lifting and pulling. The growth technological parameters which have influence on the completeness of crystal were analyzed and the r...Nd∶NBW laser crystal with the size of Φ8 mm×20 mm was grown by the process of lifting and pulling. The growth technological parameters which have influence on the completeness of crystal were analyzed and the reasonable technological parameters were ascertained.展开更多
Electrochemical conversion of CO_(2)to CO is an economically feasible method for mitigating greenhouse gas emissions.Among various electrochemical approaches,solid oxide electrolysis cells(SOECs)show high potential fo...Electrochemical conversion of CO_(2)to CO is an economically feasible method for mitigating greenhouse gas emissions.Among various electrochemical approaches,solid oxide electrolysis cells(SOECs)show high potential for CO_(2)reduction reaction(CO_(2)-RR)due to their ability to operate at high temperatures,resulting in fast reaction kinetics and increased efficiency.Considering their main energy loss is still associated with the large overpotential at the fuel electrode,the development of the highly efficient and durable cathode for SOECs has been extensively searched after.Here,we propose an A-site doping strategy to enhance the properties of Sr_(2)Fe_(1.5)Mo_(0.5)O_(6−δ)(SFM),which improve its performance as a cathode in SOECs for CO_(2)-RR,demonstrating favorable activity and durability.The structural and physiochemical characterizations,together with DFT calculations,show that the partial replacement of Sr by Bi in the SFM double perovskite not only improves CO_(2) adsorption capability at the catalyst surface but also enhances oxygen ionic conduction inside the bulk oxide,resulting in enhanced CO_(2)electrocatalysis performance in SOECs.Specifically,a La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(0.2)O_(3−δ) (LSGM)electrolyte-supported single cell with the new Bi-doped SFM cathode demonstrates a large current density of 1620 mA cm^(−2) at a cell potential of 1.6 V at 850°C with good operational stability up to 200 h.Bi-doped SFM thus represents a highly promising cathode for ceramic CO_(2)electrolyzers and could accelerate our transition towards a carbon-neutral society.展开更多
基金Supported by the National Natural Science Foundation of China (No.50672087 and No.60778039)National Basic Research Program of China (No.2006CB806000)+1 种基金National High Technology Program of China (No.2006AA03Z304)supported by Program for Changjiang Scholars and Innovative Research Team in University
文摘We report on broadband infrared emission of bismuth-doped RO-B2O3（R=Ca, Sr, Ba） glasses. Glass samples are prepared under various conditions by a conventional melting-quenching method and the luminescence properties in infrared wavelength region are investigated. No apparent infrared luminescence is observed in the SrO-B2O3 and BaO-B2O3 prepared in air, while glasses prepared in reducing atmosphere exhibit a broadband infrared luminescence peaking at 1 300 nm with a full width at half maximum（FWHM） of about 200 nm when excited by an 800 nm laser diode. A mechanism was proposed to explain the observed phenomena. The presence of low valence bismuth, probably Bi^＋, is responsible for the broadband infrared emission.
文摘Nd∶NBW laser crystal with the size of Φ8 mm×20 mm was grown by the process of lifting and pulling. The growth technological parameters which have influence on the completeness of crystal were analyzed and the reasonable technological parameters were ascertained.
基金financially supported by the State Key Laboratory of Clean Energy Utilization(Open Fund Project No.ZJUCEU2021001)Natural Science Foundation of Jiangsu Province(No.BK20221312).
文摘Electrochemical conversion of CO_(2)to CO is an economically feasible method for mitigating greenhouse gas emissions.Among various electrochemical approaches,solid oxide electrolysis cells(SOECs)show high potential for CO_(2)reduction reaction(CO_(2)-RR)due to their ability to operate at high temperatures,resulting in fast reaction kinetics and increased efficiency.Considering their main energy loss is still associated with the large overpotential at the fuel electrode,the development of the highly efficient and durable cathode for SOECs has been extensively searched after.Here,we propose an A-site doping strategy to enhance the properties of Sr_(2)Fe_(1.5)Mo_(0.5)O_(6−δ)(SFM),which improve its performance as a cathode in SOECs for CO_(2)-RR,demonstrating favorable activity and durability.The structural and physiochemical characterizations,together with DFT calculations,show that the partial replacement of Sr by Bi in the SFM double perovskite not only improves CO_(2) adsorption capability at the catalyst surface but also enhances oxygen ionic conduction inside the bulk oxide,resulting in enhanced CO_(2)electrocatalysis performance in SOECs.Specifically,a La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(0.2)O_(3−δ) (LSGM)electrolyte-supported single cell with the new Bi-doped SFM cathode demonstrates a large current density of 1620 mA cm^(−2) at a cell potential of 1.6 V at 850°C with good operational stability up to 200 h.Bi-doped SFM thus represents a highly promising cathode for ceramic CO_(2)electrolyzers and could accelerate our transition towards a carbon-neutral society.
