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Oxygen-deficient TiO_(2) Yolk-shell Spheres for Enhanced Lithium Storage Properties

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Energy & Environmental Materials 2022年第1期5卷 238-244页

作者： Zhaoqian Li Yuqi Peng Chaofeng Liu Xianxi Zhang Xiuling Li Yang Huang yingke ren Denghui Ji Guozhong Cao Key Laboratory of Photovoltaic and Energy Conservation Materials CASInstitute of Solid State PhysicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China College of Science Hebei University of Science and TechnologyShijiazhuang 050018China Shandong Provincial Key Laboratory/Collaborative Innovation Center of Chemical Energy Storage&Novel Cell Technology School of Chemistry and Chemical EngineeringLiaocheng UniversityLiaocheng 252000China Department of Materials Science and Engineering University of WashingtonSeattle WA 98195USA College of Physics Mechanical and Electronical CollegeShijiazhuang UniversityShijiazhuang City 050035P.R.China College of Physics and Information Engineering Hebei Advanced Thin Films LaboratoryHebei Normal UniversityShijiazhuang City 050024P.R.China

Anatase TiO_(2) is a promising anode material for lithium-ion batteries(LIBs)owing to its low cost and ***,the intrinsically kinetic limits seriously hindered its lithium-ion storage *** we present that anatase TiO_(2) with rich oxygen vacancies can enhance its lithium-ion storage *** synthesize anatase TiO_(2) with well-retained hierarchical structure by annealing the H_(2)Ti_(5)O_(11)·3H_(2)O yolk-shell spheres precursor in nitrogen *** and XPS data evidence that the oxygen-deficient environment could generate abundant oxygen vacancies in the as-derived anatase TiO_(2),which leads to improved electron conductivity and reduced charge-transfer *** rich oxygen vacancies and high structural integrity of the hierarchical yolk-shell spheres enable the as-derived anatase TiO_(2) yolk-shell spheres with a high specific capacity of 280 mAh g^(-1) at 100 mA g^(-1) and 71%of capacity retention after 5000 cycles at 2 A g^(-1).

关键词： anatase TiO_(2) lithium-ion batteries oxygen vacancies yolk-shell spheres

Molecular exchange and passivation at interface afford high-performing perovskite solar cells with efficiency over 24%

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Journal of Energy Chemistry 2023年第7期82卷 219-227,I0005页

作者： Jianjun Sun Wangchao Chen yingke ren Yunjuan Niu Zhiqian Yang Li'e Mo Yang Huang Zhaoqian Li Hong Zhang Linhua Hu Key Laboratory of Photovoltaic and Energy Conservation Materials Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031AnhuiChina School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of TechnologyHefei 230009AnhuiChina College of Science Hebei University of Science and TechnologyShijiazhuang 050018HebeiChina Hebei Computational Optical Imaging and Photoelectric Detection Technology Innovation Center Hebei International Joint Research Center for Computational Optical Imaging and Intelligent SensingSchool of Mathematics and Physics Science and EngineeringHebei University of EngineeringHandan 056038HebeiChina University of Science and Technology of Chin1 Anhui 230026HefeiChina

The interface is crucial for perovskite solar cells(PSCs).However,voids at interfaces induced by the trapped hygroscopic dimethyl sulfoxide(DMSO)can reduce charge extraction and accelerate the film degradation,seriously damaging the efficiency and *** this work,4,4’-dinonyl-2,2’-dipyridine(DN-DP),a Lewis base with long alkyl chains is introduced to solve this *** calculated and experimental results confirm that the dipyridyl group on DN-DP can more strongly coordinate with Pb^(2+)than that of the S=O group on *** strong coordination effect plays a crucial role in removing the DMSO-based adduct and reducing the formation of *** to the electron-donating properties of pyridine,the existence of DN-DP in the perovskite film can passivate the defects and optimize the energy level alignment of the perovskite *** open-circuit voltage(VOC)of the DN-DP-based PSC is improved from 1.107 V(control device)to 1.153 V,giving rise to a power conversion efficiency(PCE)of24.02%.Furthermore,benefiting from the moisture resistance stemming from the hydrophobic nonyl group,the PCE retains 90.4%of the initial performance after 1000 h of storage in the ambient condition.

关键词： Perovskite solar cell Anti-solvent 4 4′-Dinonyl-2 2′-dipyridine Optimized interfaceStability

Restrictingδ-phase transformation of HC(NH2)2PbI3 via iodine-vacancy filling for efficient perovskite solar cells

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Science China Materials 2020年第6期63卷 1015-1023页

作者： yingke ren Ning Zhang Qian W ang Jun Zhu Cong Li State Key Lab of Advanced Display Technology Special Display and Imaging Technology Innovation Center of Anhui ProvinceAcademy of Opto-Electric TechnologyHefei University of TechnologyHefei 230009China College of Science Hebei University of Science and TechnologyShijiazhuang 050018China 32152 Troops Shijiazhuang 050018China School of Adv Mater and Nanotechnology Xidian UniversityXi'an 710126China

Formamidinium lead halide(α-FAPbI3)with a broad light absorption spectrum,has recently received considerable attention in optoelectronic ***,the FAI-PbI2-DMSO(DMSO:dimethyl sulfoxide)intermediate anisotropic fibers readily form a non-perovskite phase(δ-FAPbI3)and uncontrolled excess PbI2,which hinders the further increase in the efficiencies of solar *** indicate that iodine defects in polycrystalline films would enlarge the perovskite tolerance factor and result in the formation of iodide Frenkel ***,we introduce a post-treatment technique to heal the as-prepared FAPbI3 thin layer and restrain the notoriousδ-FAPbI3 through vacancy ***,a new intermediate phase of FAI-PbI2-DMSO-FACl led to a high-quality perovskite layer with an enlarged average grain size that exceeded 2μ***,the power conversion efficiencies of FAPbI3 solar cells were significantly enhanced due to the high crystallity of the pureα-phase ***,this method can be used to obtain high pure-black perovskite films and efficient solar cells.

关键词： formamidinium perovskite solar cells iodine vacancy nonperovskite phase post-treatment

Advanced partial nucleation for single-phase FA0.92MA0.08PbI3-based high-efficiency perovskite solar cells

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Science China Materials 2019年第12期62卷 1846-1856页

作者： Pengju Shi Yong Ding Cheng Liu Yi Yang Zulqarnain Arain Molang Cai yingke ren Tasawar Hayat Ahmed Alsaedi Songyuan Dai State Key Laboratory of Alternate Hectrical Power System with renewable Energy Sources North China Electric Power UniversityBeijing 102206China Beijing Key Laboratory of Novel Thin-Film Solar CeUs Beijing Key Laboratory of Energy Safely and Clean UtilizationNorth China Electric Power UniversityBeijing 102206China Energy System Engineering Department Sukkur IB A UniversitySukkur 65200Pakistan NAAM Research Group Department of MathematicsFaculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

To date, extensive research has been carried out,with considerable success, on the development of highperformance perovskite solar cells(PSCs). Owing to its wide absorption range and remarkable thermal stability, the mixedcation perovskite FAxMA1-xPbI3(formamidinium/methylammonium lead iodide) promises high performance. However, the ratio of the mixed cations in the perovskite film has proved difficult to control with precursor solution. In addition, the FAxMA1-xPbI3 films contain a high percentage of MA+and suffer from serious phase separation and high trap states, resulting in inferior photovoltaic performance. In this study, to suppress phase separation, a post-processing method was developed to partially nucleate before annealing, by treating the as-prepared intermediate phase FAI-Pb I2-DMSO(DMSO: dimethylsulfoxide) with mixed FAI/MAI solution. It was found that in the final perovskite, FA0.92MA0.08 PbI3, defects were substantially reduced because the analogous molecular structure initiated ion exchange in the post-processed thin perovskite films, which advanced partial nucleation. As a result, the increased light harvesting and reduced trap states contributed to the enhancement of open-circuit voltage and short-circuit current. The PSCs produced by the post-processing method presented reliable reproducibility, with a maximum power conversion efficiency of 20.80% and a degradation of ~30% for 80 days in standard atmospheric conditions.

关键词： perovskite solar cell (PSC) mixed cations partialnucleation single phase defects stability

Boosting optoelectronic performance of MAPbI3 perovskite solar cells via ethylammonium chloride additive engineering

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Science China Materials 2020年第12期63卷 2477-2486页

作者： Muhammad Mateen Zulqarnain Arain Xuepeng Liu Atif Iqbal yingke ren Xianfu Zhang Cheng Liu Qin Chen Shuang Ma Yong Ding Molang Cai Songyuan Dai Key Laboratory of Novel Thin-Film Solar Cells North China Electric Power UniversityBeijing 102206China State Key Laboratory of Alternate Electrical Power System with renewable Energy Sources North China Electric Power UniversityBeijing 102206China Energy Systems Engineering Department Sukkur IBA UniversitySukkur 65200Pakistan College of Science Hebei University of Science and TechnologyShijiazhuang 050018China

The quality of the perovskite light absorption layer plays a dynamic role in the photovoltaic properties of solar *** existing methods to prepare methylammonium lead iodide(MAPbI3)films render substantial structural defect density,particularly at the grain boundaries and film surface,constituting a challenge that hinders the further optoelectronic enhancement of perovskite solar ***,a unique approach was introduced:using a simple ethylammonium chloride(EACl)additive in perovskite precursor mixture to produce high-quality MAPbI3 thin *** results indicated that EACl could encourage perovskite crystal growth without experiencing the intermediate phase formation and would evaporate from the perovskite after ***,a gradient perovskite structure was achieved using this technique,which impressively enhanced the performance of the perovskite films.A high power conversion efficiency(PCE)of 20.03%was achieved under the optimal amount of EACl,and the resultant efficient device could retain over 89%of the original PCE after aging for 1000 h at room *** novel technique leads to a facile fabrication of highquality and less-defect perovskite thin films for competent and stable devices.

关键词： perovskite solar cells ethylammonium chloride crystal growth stability

不同溶剂诱导的中间相对钙钛矿薄膜结晶的影响

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石家庄铁道大学学报（自然科学版） 2023年第4期36卷 114-119页

作者：尚志丰任英科石家庄铁道大学工程训练中心河北石家庄050043 河北科技大学理学院河北石家庄050018

有机-无机杂化钙钛矿(MAPbI_(3))太阳能电池的光电转化效率增长飞速而被广泛关注。然而由于PbI_(2)的生长速率要快于MAI的生长速率,导致钙钛矿晶体的形貌难以控制。因此,制备MAPbI_(3)过程中统一MAI和PbI_(2)生长速率极为重要。二甲基... 详细信息

有机-无机杂化钙钛矿(MAPbI_(3))太阳能电池的光电转化效率增长飞速而被广泛关注。然而由于PbI_(2)的生长速率要快于MAI的生长速率,导致钙钛矿晶体的形貌难以控制。因此,制备MAPbI_(3)过程中统一MAI和PbI_(2)生长速率极为重要。二甲基甲酰胺(DMF)和二甲基亚砜(DMSO)作为氧给体可与PbI_(2)形成配合物,用来制备致密的钙钛矿薄膜。通过改变前驱体溶液中DMF和DMSO的比例,调控中间相的形成过程实现了对晶体生长速率的调控。此外,DMSO与PbI_(2)的配位能力要强于DMF,并且DMSO更容易与路易斯酸PbI_(2)的S=O双键发生作用,影响晶体的生长速率。最后,基于最佳浓度的DMSO前驱体溶液制备的钙钛矿薄膜的光伏器件,其光电转化效率可以达到16.41%。

关键词：薄膜技术钙钛矿太阳能电池路易斯酸碱中间相调控形貌

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Sb_(2)S_(3):P3HT共混物改善TiO_(2)纳米棒阵列钙钛矿太阳电池的性能

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河北科技大学学报 2022年第2期43卷 204-210页

作者：郭丽峰郝彦忠任英科裴娟河北科技大学理学院河北石家庄050018

为解决钙钛矿太阳电池中MAPbI_(3)的不稳定性问题,提高电池性能,对以TiO_(2)纳米棒阵列作为电子传输层、Sb_(2)S_(3):P3HT共混物作为钙钛矿MAPbI_(3)修饰层的太阳电池进行了研究。首先,以SbCl_(3)作为锑源,Na_(2)S_(2)O_(3)作为硫源,采... 详细信息

为解决钙钛矿太阳电池中MAPbI_(3)的不稳定性问题,提高电池性能,对以TiO_(2)纳米棒阵列作为电子传输层、Sb_(2)S_(3):P3HT共混物作为钙钛矿MAPbI_(3)修饰层的太阳电池进行了研究。首先,以SbCl_(3)作为锑源,Na_(2)S_(2)O_(3)作为硫源,采用溶剂热法制备合适尺寸的Sb_(2)S_(3)纳米球;其次,通过超声分散法将Sb_(2)S_(3)与P3HT在氯苯溶液中共混得到Sb_(2)S_(3):P3HT共混物,将其旋涂于沉积了MAPbI_(3)薄膜的TiO_(2)纳米棒阵列上,形成FTO/TiO_(2)NR/MAPbI_(3)/Sb_(2)S_(3):P3HT复合膜,制备成TiO_(2)纳米棒阵列MAPbI_(3)/Sb_(2)S_(3):P3HT太阳电池;最后,采用SEM,XRD,J-V曲线和紫外可见吸收光谱等方法进行表征和测试。结果表明,制备的结构为FTO/TiO_(2)NR/MAPbI_(3)/Sb_(2)S_(3):P3HT/Spiro-OMeTAD/Ag的太阳电池,能量转换效率(PCE)最高达到了14.73%,与未采用Sb_(2)S_(3):P3HT共混物修饰的TiO_(2)纳米棒阵列MAPbI_(3)太阳电池相比,能量转换效率得到了明显提升。因此,Sb_(2)S_(3):P3HT共混物能避免出现钙钛矿MAPbI_(3)被氧化的不稳定性问题,可有效提高TiO_(2)纳米棒阵列MAPbI_(3)太阳电池的性能。

关键词：光电化学钙钛矿太阳电池 TiO_(2)纳米棒阵列 Sb_(2)S_(3):P3HT共混物 MAPbI_(3)

Localized Electrons Accelerated Ionic and Charge Transfer for Superior Lithium Storage

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renewables 2023年第5期1卷 572-581页

作者： Zhaoqian Li yingke ren Wangchao Chen Tingting Wei Lie Mo Yang Huang Hong Zhang Guozhong Cao Linhua Hu Key Laboratory of Photovoltaic and Energy Conservation Materials CASInstitute of Solid State PhysicsHefei Institutes of Physical ScienceChinese Academy of SciencesHefeiAnhui 230031 College of Science Hebei University of Science and TechnologyShijiazhuang 050018 School of Chemistry and Chemical Engineering Anhui Province Key Laboratory of Advanced Catalytic Materials and Reaction EngineeringHefei University of TechnologyHefei 230009 University of Science and Technology of China HefeiAnhui 230026 Hebei Computational Optical Imaging and Photoelectric Detection Technology Innovation Center Hebei International Joint Research Center for Computational Optical Imaging and Intelligent SensingSchool of Mathematics and Physics Science and EngineeringHebei University of EngineeringHebeiHandan 056038 Department of Materials Science and Engineering University of WashingtonSeattleWashington 98195

The electrochemical energy storage performance is greatly determined by the charge transfer and ion transportation occurring in the electrode ***,the enhancement of electric conductivity and ionic mobility is vital for high-performing and stable metal ion ***,we report the properties of oxygen vacancies(VO)and carbon co-doped TiO_(2) hollow spheres(HS-TiO_(2))and compared them with fully oxidized white TiO_(2) hollow spheres(W-TiO_(2)).Theoretical calculations and experimental results revealed that the introduction of carbon dopant and VO in anatase TiO_(2) reduced the bandgap and the existence of localized electrons,leading to a lower migration barrier of Li ions that promoted faster ion diffusion kinetics,enabling the HS-TiO_(2) with higher reversibility during the insertion and extraction of Li ions than the W-TiO_(2).This HS-TiO_(2) delivered superior lithium storage properties with a specific discharge capacity of 214.6 mAh g^(-1) for the 100th cycle at 200 mA g^(-1) and 116.3 mAh g^(-1) over 2000 cycles at a high rate of 2 A g^(-1).

关键词： titanium dioxide localized electrons uniform hollow structure oxygen vacancies lithium-ion batteries

宣肺运脾方辅助西药治疗儿童哮喘并发反复呼吸道感染临床研究

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陕西中医 2024年第10期45卷 1357-1360页

作者：王秋莉刘应科杨晔任昕昕余惠平北京市和平里医院儿科北京100013 北京中医药大学东直门医院儿科北京100700

目的:探究宣肺运脾方辅助西药治疗哮喘并反复呼吸道感染儿童的临床价值。方法:将110例哮喘并发反复呼吸道感染患儿按抽签法分为西医组55例,使用西药治疗;中西医结合组55例,使用宣肺运脾方加西药治疗。比较两组疗效指标、炎症因子、免疫... 详细信息

目的:探究宣肺运脾方辅助西药治疗哮喘并反复呼吸道感染儿童的临床价值。方法:将110例哮喘并发反复呼吸道感染患儿按抽签法分为西医组55例,使用西药治疗;中西医结合组55例,使用宣肺运脾方加西药治疗。比较两组疗效指标、炎症因子、免疫功能及药物不良反应发生情况。结果:两组疗效指标、炎症因子、免疫功能比较差异均有统计学意义(P0.05)。结论:西药联合宣肺运脾方治疗哮喘并反复呼吸道感染儿童可提高疗效,抑制炎症反应,改善免疫功能。

关键词：哮喘宣肺运脾方舒利迭反复呼吸道感染儿童炎症因子免疫功能