Pb contamination in aquatic environments causes severe pollution;therefore,harmless absorbents are required.In this study,we report a novel synthesis of whitlockite(WH,Ca_(18)Mg_(2)(HPO_(4))_(2)(PO_(4))_(12)),which is...Pb contamination in aquatic environments causes severe pollution;therefore,harmless absorbents are required.In this study,we report a novel synthesis of whitlockite(WH,Ca_(18)Mg_(2)(HPO_(4))_(2)(PO_(4))_(12)),which is the second most abundant biomineral in human bone,and its application as a high-performing Pb^(2+)absorbent.Hydroxyapatite(HAP)and WH are prepared via a simple precipitation method.The Pb2+absorption performance and mechanism of the synthesized biominerals are investigated in aqueous solutions at neutral pH.The results demonstrate that WH exhibits an excellent Pb2+absorption capacity of 2339 mg g^(−1),which is 1.68 times higher than the recorded value for HAP.Furthermore,the absorbed Pb^(2+) ions are recycled into high-purity PbI_(2).This is employed as a precursor for the fabrication of perovskite solar cells(PSCs),resulting in a conversion efficiency of 19.00%comparable to that of commercial PbI2 powder(99.99%purity).Our approach provides an efficient way to remove Pb^(2+)ions from water and reuse them in the recycling of PSCs.展开更多
A high-quality electron transport layer(ETL)is a critical component for the realization of high-efficiency perovskite solar cells.We developed a controllable direct-contact reaction process to prepare a chlorinated Sn...A high-quality electron transport layer(ETL)is a critical component for the realization of high-efficiency perovskite solar cells.We developed a controllable direct-contact reaction process to prepare a chlorinated SnO2(SnO2-Cl)ETL.It is unique in that(a)102-dichlorobenzene is used to provide more reactive Cl radicals for more in-depth passivation;(b)it does not introduce any impurities other than chlorine.It is found that the chlorine modification significantly improves the electron extraction.Consequently,its associated solar cell efficiency is increased from 17.01%to 17.81%comparing to the pristine SnO2 ETL without the modification.The hysteresis index is significantly reduced to 0.017 for the SnO2-Cl ETL.展开更多
基金supported by the National Research Foundation of Korea(NRF)grant funded by the Korea Government(MSIT)(NRF-2018M3C1B7021994)the Technology Development Program to Solve Climate Changes(2018M1A2A2058207)+3 种基金Institute of Information&Communications Technology Planning&Evaluation(IITP)grant funded by the Korea Government(MSIT)(No.2020-0-00541,Flexible Photovoltaic Device Module with Autonomous Power Supply for Smart Farm Wireless Composite IoT Sensor)Korea Institute of Energy Technology Evaluation and Planning(KETEP)grant funded by the Korea government(MOTIE)(20203040010320)the Korea Evaluation Institute of Industrial Technology(KEIT)(20016588)funded by the Korea Governmentsupported by the Research Institute of Advanced Materials(RIAM)and National Center for Inter-university Research Facilities(NCIRF)at Seoul National University.
文摘Pb contamination in aquatic environments causes severe pollution;therefore,harmless absorbents are required.In this study,we report a novel synthesis of whitlockite(WH,Ca_(18)Mg_(2)(HPO_(4))_(2)(PO_(4))_(12)),which is the second most abundant biomineral in human bone,and its application as a high-performing Pb^(2+)absorbent.Hydroxyapatite(HAP)and WH are prepared via a simple precipitation method.The Pb2+absorption performance and mechanism of the synthesized biominerals are investigated in aqueous solutions at neutral pH.The results demonstrate that WH exhibits an excellent Pb2+absorption capacity of 2339 mg g^(−1),which is 1.68 times higher than the recorded value for HAP.Furthermore,the absorbed Pb^(2+) ions are recycled into high-purity PbI_(2).This is employed as a precursor for the fabrication of perovskite solar cells(PSCs),resulting in a conversion efficiency of 19.00%comparable to that of commercial PbI2 powder(99.99%purity).Our approach provides an efficient way to remove Pb^(2+)ions from water and reuse them in the recycling of PSCs.
基金The authors thank the financial support received from the National Research Foundation(NRF)of Korea grant funded by the Korea government(No.2017R1A2B3010927)Basic Science Research Program through the National Research Foundation of Korea(NRF-2014R1A4A1008474)+1 种基金Creative Materials Discovery Program(2016M3D1A1027664)National University Research Fund(GK201903051).
文摘A high-quality electron transport layer(ETL)is a critical component for the realization of high-efficiency perovskite solar cells.We developed a controllable direct-contact reaction process to prepare a chlorinated SnO2(SnO2-Cl)ETL.It is unique in that(a)102-dichlorobenzene is used to provide more reactive Cl radicals for more in-depth passivation;(b)it does not introduce any impurities other than chlorine.It is found that the chlorine modification significantly improves the electron extraction.Consequently,its associated solar cell efficiency is increased from 17.01%to 17.81%comparing to the pristine SnO2 ETL without the modification.The hysteresis index is significantly reduced to 0.017 for the SnO2-Cl ETL.
基金This work was supported from the Global Frontier R＆D Program on Center for Multiscale Energy System, Republic of Korea （No. 2012M3A6A7054855） and National Science Foundation （Nos. CMMI-1333182 and EPMD-1408025）.
