ORGANIC ELECTRONICS
·
2017
·
IF 3.399
Cuncun Wu,Ziru Huang,Yihao He,Wei Luo,Hungkit Ting,Tieyi Li,Weihai Sun,Qiaohui Zhang,Zhijian Chen,Lixin Xiao
Recently, perovskite solar cells have attracted tremendous research interest due to their amazing light to electric power conversion efficiency (PCE). However, most high performance devices usually use mesoporous TiO 2 as the electron transport layer (ETL), which increases cost for practical application. Here, TiO 2 /SnO x Cl y double layer was employed as the ETL for planar perovskite solar cells . Compared with bare TiO 2 , perovskite solar cell based on TiO 2 /SnO x Cl y shows drastically improved power conversion efficiency and reduced hysteresis. These improvements are attributed to TiO 2 /SnO x Cl y which could enhance electron extraction and reduce surface trap-state.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 14
·
IF 12.5
Hong-Bo Cui,Guijian Guan,Ming-Yong Han
An innovative viscosity-dependent hydrothermal strategy is developed for the controlled synthesis of multinary titanate perovskites, specifically Na0.5Y0.39Yb0.1Er0.01TiO3. By manipulating the viscosity of the reaction solution using various stable additives in both type and quantity, we identify a critical viscosity threshold of ~100 centipoise, which is essential for producing uniform faceted particles. With sodium hydroxide as an additive, a clear morphological evolution occurs as hydroxide concentration increases, shifting from regular cubes to edge-truncated, half-corner-truncated, and fully corner-truncated cube particles. Furthermore, the inclusion of additional sodium chloride and acetate substantially increases the viscosity, facilitating the formation of uniform faceted particles with reduced sizes ranging from ~2.0 micrometers to 200 nanometers. This method is successfully applied to synthesize other uniform perovskites, including Na0.5Y0.395Yb0.1Tm0.005TiO3, Na0.5Y0.4Eu0.1TiO3, Na0.5Y0.39Yb0.1Ho0.01TiO3, and Na0.5Bi0.5TiO3. Our findings provide valuable insights into viscosity-controlled synthesis for creating multinary perovskites and enhance their potential for designing optical functional materials and advancing various applications in optical temperature sensing, anti-counterfeiting security, and fingerprint recognition.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Energy Materials
·
2019
·Vol. 10
·期 5
·1903092
·
IF 24.884
Qifei Wang,Wenhao Zhang,Zhihui Zhang,Shuang Liu,Jiawen Wu,Yanjun Guan,Anyi Mei,Yaoguang Rong,Yue Hu,Hongwei Han
Controlling the crystallization of organic–inorganic hybrid perovskite is of vital importance to achieve high performing perovskite solar cells. The growth mechanism of perovskites has been intensively studied in devices with planar structures and traditional structures. However, for the printable mesoscopic perovskite solar cells, it is difficult to study the crystallization mechanism of perovskite owing to the complicated mesoporous structure. Here, a solvent evaporation controlled crystallization method to achieve ideal crystallization in the mesoscopic structure is provided. Combining results of scanning electron microscope and X-ray diffraction, it is found that adjusting the evaporation rate of solvent can control the crystallization rate of perovskite and a model for the crystallization process during annealing in mesoporous structures is proposed. Finally, a homogeneous pore filling in the mesoscopic structure without any additives is successfully achieved and a stabilized power conversion efficiency of 16.26% using ternary-cation perovskite absorber is realized. The findings will provide better understanding of perovskite crystallization in printable mesoscopic perovskite solar cells and pave the way for the commercialization of perovskite solar cells.
研究领域:
材料科学
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能源技术
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光伏器件
✓ 已验证
DOI
高影响因子
Advanced Science
·
2021
·Vol. 8
·期 10
·2004662
·
IF 16.806
Wanpei Hu,Zhiling Wen,Xin Yu,Peisen Qian,Weitao Lian,Xingcheng Li,Yanbo Shang,Xiaojun Wu,Tao Chen,Yalin Lu,Mingtai Wang,Shangfeng Yang
Low-temperature solution-processed TiO 2 nanocrystals (LT-TiO 2 ) have been extensively applied as electron transport layer (ETL) of perovskite solar cells (PSCs). However, the low electron mobility, high density of electronic trap states, and considerable photocatalytic activity of TiO 2 result in undesirable charge recombination at the ETL/perovskite interface and notorious instability of PSCs under ultraviolet (UV) light. Herein, LT-TiO 2 nanocrystals are in situ fluorinated via a simple nonhydrolytic method, affording formation of Ti─F bonds, and consequently increase electron mobility, decrease density of electronic trap states, and inhibit photocatalytic activity. Upon applying fluorinated TiO 2 nanocrystals (F-TiO 2 ) as ETL, regular-structure planar heterojunction PSC (PHJ-PSC) achieves a champion power conversion efficiency (PCE) of 22.68%, which is among the highest PCEs for PHJ-PSCs based on LT-TiO 2 ETLs. Flexible PHJ-PSC devices based on F-TiO 2 ETL exhibit the best PCE of 18.26%, which is the highest value for TiO 2 -based flexible devices. The bonded F atoms on the surface of TiO 2 promote the formation of Pb─F bonds and hydrogen bonds between F − and FA/MA organic cations, reinforcing interface binding of perovskite layer with TiO 2 ETL. This contributes to effective passivation of the surface trap states of perovskite film, resulting in enhancements of device efficiency and stability especially under UV light.
研究领域:
材料科学
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能源技术
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Ling Tan,Yufei Huang,Wei Mao,Xiayi Hu,Yangqiang Huang,Hao Chen,Xiao Luo
Diphenyl carbonate (DPC) is a crucial organic chemical intermediate that is widely applied for the synthesis of polycarbonate. The process of transesterification of dimethyl carbonate (DMC) and phenol to produce DPC is promising and is in line with the requirements of green transitions and raw material sustainability. In this work, anatase-layered titanium dioxide (A-TiO2) was prepared and applied for the efficient transesterification of DMC and phenol to synthesize DPC with 10.5% phenol conversion and 87.9% DPC selectivity. The high activity and selectivity of transesterification over A-TiO2 were ascribed via characterizations to the tetracoordinate Ti species and Lewis acid–base sites on the catalyst surface. We further studied the deactivation mechanism of this kind of A-TiO2, and it was found that Ti leaching and the deposition of organic compounds onto the catalyst surface were the major reasons for deactivation during transesterification. This study provides some insights into the design of highly active and selective catalysts for transesterification reactions.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Science Advances
·
2025
·Vol. 11
·期 3
·
IF 12.5
Yikai Yun,Qing Chang,Jinjian Yan,Yuanyuan Tian,Sijie Jiang,Wenjie Wei,Shaoqun Li,Yuzheng Guo,Jun Yin,Jing Li,Mengyu Chen,Kai Huang,Cheng Li,Rong Zhang
The utilization of low-dimensional perovskites (LDPs) as interlayers on three-dimensional (3D) perovskites has been regarded as an efficient strategy to enhance the performance of perovskite solar cells. Yet, the formation mechanism of LDPs and their impacts on the device performance remain elusive. Herein, we use dimensional engineering to facilitate the controllable growth of 1D and 2D structures on 3D perovskites. The differences of isomeric ligands in electrostatic potential distribution and steric effects for intermolecular forces contribute to different LDPs. The 1D structure facilitates charge transfer with favored channel orientation and energy level alignment. This approach enables perovskite solar modules (PSMs) using 2,2′,7,7′-tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene to achieve an efficiency of 20.20% over 10 by 10 square centimeters (cm2) and 22.05% over 6 by 6 cm2. In particular, a PSM (6 by 6 cm2) using poly[bis(4-phenyl)(2,4,6-trimethylphenyl)amine] maintains an initial efficiency of ~95% after 1000 hours under the rigorous ISOS-L-3 accelerated aging tests, marking a record for the highest stability of n-i-p structure modules.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Zhiwei Su,Caibo Yan,Zhe Lv,Yaoyao Liu,Yanwen Zhou
The SWSA (super-wicking and super-light-absorbing) structure of a titanium alloy (TC4) solar interfacial evaporator with open grooves may improve the clogging issues in sewage purification. There persist the challenges of the non-durable hydrophilicity owing to the carbon-containing gases absorbing by its loose micro-nano surface, and the biological calcification owing to the biocompatibility of titanium alloy. TiO 2 (Ag/Cu) films were designed and prepared on top of SWSA to encapsulate the loose nano-structure, whilst remained micro-structure unchanged, by forming a dense continuous layer with surface durable hydrophilicity and biological fouling resistance. The results showed that the durable hydrophilicity of the film-sealed evaporator extended up to 150 days until the test was forcibly terminated, which increased at least 6.25 times. The encapsulation function by the dense layer was to reduce the surface adsorption of carbon-containing gases, proved by XPS results. The TiO 2 (Ag/Cu) films endowed Anti-biological fouling and organic matter decomposition ability by the virtue of the antibacterial property of Ag and Cu and the photocatalytic effect of the TiO 2 . The structural of the TiO 2 (Ag/Cu)-SWSA TC4 interface evaporator showed its reasonable evaporation rate of 1.54 L×h −1 ×m −2 , durable hydrophilicity, and excellent anti-biological fouling properties, which could be promising to purify fouling water.
研究领域:
材料科学
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环境工程
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR BIOSCIENCE
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2025
·
IF 4.1
Huimin Cheng,Jing Zhang,Jinxi Liu,Rui Ding,Wenbin Zhong,Han Zheng,Zhenyan Zhang,Peng Li
Implants made of titanium (Ti) and its alloys are widely used in orthopedics and dentistry. However, the Ti-based materials, due to their inherent surface bioinertness, lack antibacterial properties and osteoconductive activity, leading to an increased risk of bacterial infection post-implantation and suboptimal osseointegration efficiency. Herein, an antibacterial and osteoconductive coating via polydopamineassisted immobilization of poly(N-vinyl pyrrolidone)-iodine (PVP-I) on TiO 2 nanotubes named TNT-DP-I is constructed. The TNT-DP-I coating could rapidly kill 97.80% Gram-positive Staphylococcus aureus ( S. aureus ) and 97.96% Gram-negative Escherichia coli ( E. coli ) within 1 h, highlighting its superior antibacterial efficiency. Additionally, this coating effectively promoted pre-osteoblasts MC3T3-E1 adhesion, growth, and proliferation, demonstrating enhanced osteoconductivity. Meanwhile, TNT-DP-I coating demonstrated good mammalian cytocompatibility and hemocompatibility, suggesting its promising biosafety. Overall, this study presents a facile approach for reducing bacterial contamination and enhancing osseointegration of Ti implants.
研究领域:
生物材料学
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医学工程
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微生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2019
·
IF 7.467
Yuqing Xiao,Changlei Wang,Kiran Kumar Kondamareddy,Pei Liu,Fei Qi,Huijie Zhang,Shishang Guo,Xing-Zhong Zhao
Surface passivation of the electron transport layer in perovskite solar cells has been proven to be one crucial strategy to improve the power conversion efficiency . In this study, we introduce rutile phase titania shell to passivate anatase TiO 2 scaffold, forming anatase@rutile mixed-phase TiO 2 scaffold in hole-conductor-free carbon based perovskite solar cells . Anatase@rutile mixed phase TiO 2 films exhibit higher conductivity, faster charge extraction, lower trap density and suppressed charge recombination at the interface of TiO 2 /perovskite films in the modified devices as well, achieving a champion power conversion efficiency of 15.21% for carbon based perovskite solar cells . More importantly, benefiting from the stable and better ultraviolet light filtration properties of rutile phase TiO 2 , our devices exhibit excellent stability maintaining 92% of their initial efficiency after 200 days storage in ambient air, highlighting their merits as a potential competitor for future industrial photovoltaics .
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Huaibing Liu,Jingchao Xiao,Kuo Cao,Naiqing Ren,Haiyan He,Yixuan Li,Juntao Si,Sihan Zeng,Bicai Pan,Chunhua Chen
On account of the low operating potential and slow electrochemical kinetics, graphite anode suffers from poor rate performance and severe safety problems in lithium-ion batteries (LIBs). Therefore, it’s urgent to find alternatives. Due to the abundant intrinsic vacancies and ion migration channels, A-site deficient perovskites could be used as not only solid state electrolytes (SSEs), but also anodes for LIBs. Here, Li 0.38 Pr 0.54 TiO 3 is firstly demonstrated as a high-rate anode material without any additional modification. With an average operating potential of 0.76 V vs. Li + /Li, the Li 0.38 Pr 0.54 TiO 3 anode possesses a high specific capacity of 217 mAh g −1 at 0.1C (1C = 200 mA g −1 ), impressive rate capability (124 mAh g −1 at 40C), and excellent cycling performance (96.75 % capacity retention over 2100 cycles at 10C). Through in-situ analysis and theoretical computations, we confirm the outstanding performance originates from small cell volume change (5.98 %), low band gap (2.57 eV), and low diffusion energy barrier (0.11 eV). The LiFePO 4 //Li 0.38 Pr 0.54 TiO 3 full cell shows superior cycling stability (79.78 % capacity retention over 1000 cycles at 5C). Moreover, the relationship between A-site structure and electrochemical properties is discussed from the perspective of vacancy concentration. Our finding also provides a novel perspective for the discovery of high-performance oxide perovskite anodes.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Jia Wu,Qiyu Huang
The photovoltaic performance of perovskite solar cells (PSCs) largely depends on the characteristics of the electron transport layer (ETL). However, conventional solution-based processes may lead to obvious voids or cavities on the film. In this publication, an anodization process was proposed to transform a layer of Ti sputtered on a fluorine-doped indium tin oxide (FTO) substrate to TiO 2 nanotubes as an ETL for PSCs. Through a one-step anodization process in an electrolyte of ethylene glycol with NH 4 F and H 2 O, an integrated 500-nm-thick layer composed of a TiO 2 nanotube layer (mesoporous layer) and a TiO 2 compact layer was obtained. This method was simple and more efficient than the spin-coating process, and there were no traps between nanotube layer and compact layer. PSCs based on this ETL achieved the highest efficiency of 12.82%, which was comparable to devices whose ETLs were fabricated by a conventional spin-coating process.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Ning Gao,Baolong Liu,Mengjie Fan,Yike Yao,Yunbo Wang,Xiaoqian Peng,Xupeng Zong,Fuyuan Xu,Yingwen Chen
This work addresses the atomic radius mismatch between Ti and Si and their limited substitution frequency by developing a sol–gel strategy to optimize active Ti site formation. A dual regulation approach, involving water and organic acids, controlled the hydrolysis rate and implemented a two-step process, forming Si-OH and Ti-OH bridging units. This enabled precise control over elemental assembly within the sol–gel system. Stabilization of the TiO x -SiO 2 mixed phase facilitated the formation of a highly active, amorphous TS aerogel catalyst, enriched with penta- and hexa -coordinated Ti. By optimizing preparation parameters, an efficient TS (1:4) aerogel catalyst was developed, achieving complete oxidative desulfurization (ODS) of 500 ppm DBT at 333 K in 10 min, with a maximum reaction rate constant (Kobs) of 0.447 min −1 and activation energy of 50.05 kJ/mol. The catalyst maintained ∼90 % desulfurization efficiency over six consecutive cycles using model oil containing sulfur compounds (BT, DBT, 4,6-DMDBT). Insights into peroxide transfer and catalyst degradation were obtained through multi-factor activity tests, active site evolution analysis, and DFT calculations. These findings improve Ti site optimization and provide a basis for refining sol–gel strategies to increase active Ti content.
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产品关联
DOI
高影响因子
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