ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Guijun Zhang,Qianwen Wei,Guangsheng Liu,Qi Li,Junlin Lu,Mehri Ghasemi,Juan Wang,Yu Yang,Baohua Jia,Xiaoming Wen
The dynamic defect tolerance under light soaking is a crucial aspect of halide perovskites. However, the underlying physics of light soaking remains elusive and is subject to debate, exhibiting both positive and negative effects. In this investigation, we demonstrated that surface defects in perovskite films significantly impact the performance and stability of perovskite solar cells, closely correlated with light soaking behaviors. Removing the top surface layer through adhesive tape, the surface defect density noticeably decreases, leading to enhanced photoluminescence (PL) efficiency, prolonged carrier lifetime, and higher conductivity. Consequently, the power conversion efficiency (PCE) of solar cells improves from 17.70% to 20.5%. Furthermore, we confirmed a positive correlation between surface defects and the light soaking effect. Perovskite films with low surface defects surprisingly exhibit a 3-fold increase in PL intensity and an 85% increase in carrier lifetime under 500 s of continuous illumination at an intensity of 100 mW/cm2. Beyond the conventional strategy of suppressing defect trapping, we propose increasing the capability of dynamic defect tolerance as an effective strategy to enhance the optoelectronic properties and performance of perovskite solar cells.
研究领域:
材料科学
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光伏技术
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半导体物理
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DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2017
·Vol. 19
·期 17
·2380-2393
·
IF 3.474
Meizhen Guo,Meiyu Song,Shanshan Li,Zhilei Yin,Xinyu Song,Yuxiang Bu
Developing a green and economical synthetic strategy for ZnS nanotubes is of great interest. In this work, ZnS nanotubes are successfully fabricated using only three raw materials (Zn(CH3COO)2, NaHCO3 and Na2S) through a simple two step synthetic route at ambient temperature. It is worth noting that the process is economical and environmentally friendly, without the need for high pressure or elevated temperature conditions. Interestingly, a very obvious feature is the existence of abundant sulfur surface defects on the as-prepared ZnS nanotubes, which not only produces strong defect-related fluorescence properties, but also leads to abundant water adsorbed on the surface of zinc sulfide. Furthermore, the as-prepared ZnS nanotubes as an adsorbent are exploited in the adsorption of organic dyes. Notably, the resultant products display superior selective adsorption ability for anionic dyes with amine (–NH2/NH) functional groups over a wide pH range through the synergistic effect of hydrogen bonding and electrostatic attraction between the dye molecules and the adsorbent. Taking CR dye as an example, the maximum adsorption capacity for the removal of Congo red reaches 724.6 mg g−1 in water, much higher than many composite adsorbents reported in the literature. Thus, the present study not only presents a promising strategy for fabrication of ZnS nanotubes but also indicates their great potential application as environmentally friendly adsorbents in organic dye separation technologies or dye removal.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2017
·Vol. 28
·期 18
·1706018
·
IF 12.124
Shulin Zhao,Meng Li,Min Han,Dongdong Xu,Jing Yang,Yue Lin,Nai-En Shi,Yanan Lu,Rui Yang,Bitao Liu,Zhihui Dai,Jianchun Bao
Owing to their unique optical, electronic, and catalytic properties, metal nitrides nanostructures are widely used in optoelectronics, clean energy, and catalysis fields. Despite great progress has been achieved, synthesis of defect-rich (DR) bimetallic nitride nanocrystals or related nanohybrids remains a challenge, and their electrocatalytic application for oxygen evolution reaction (OER) has not been fully studied. Herein, the DR-Ni 3 FeN nanocrystals and N-doped graphene (N-G) nanohybrids (DR-Ni 3 FeN/N-G) are fabricated through temperature-programmed annealing and nitridation treatment of NiFe-layered double hydroxides/graphene oxide precursors by controlling annealing atmosphere. In the nanohybrids, the DR-Ni 3 FeN nanocrystals are anchored on N-G, and mainly show twin crystal defects besides ≈10% of stacking faults. Such nanohybrids can efficiently catalyze OER in alkaline media with a small overpotential (0.25 V) to attain the current density of 10 mA cm −2 and a high turnover frequency (0.46 s −1 ), superior to their counterparts (the nearly defect-free Ni 3 FeN/N-G), commercial IrO 2 , and the-state-of-art reported OER catalysts. Except for the superior activity, they show better durability than their counterparts yet. As revealed by microstructural, spectroscopic, and electrochemical analyses, the enhanced OER performance of DR-Ni 3 FeN/N-G nanohybrids originates from the abundant twin crystal defects in Ni 3 FeN active phase and the strong interplay between DR-Ni 3 FeN and N-G.
研究领域:
材料科学
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电化学
·
催化领域
✓ 已验证
DOI
高影响因子
Science Bulletin
·
2024
·
IF 18.8
Hailiang Wang,Qixian Zhang,Zedong Lin,Huicong Liu,Xiaozhen Wei,Yongfa Song,Chunyu Lv,Weiping Li,Liqun Zhu,Kexiang Wang,Zhenhua Cui,Lan Wang,Changqing Lin,Penggang Yin,Tinglu Song,Yang Bai,Qi Chen,Shihe Yang,Haining Chen
Defects formed at the surface, buried interface and grain boundaries (GB) of CsPbI 3 perovskite films considerably limit photovoltaic performance. Such defects could be passivated effectively by the most prevalent post modification strategy without compromising the photoelectric properties of perovskite films, but it is still a great challenge to make this strategy comprehensive to different defects spatially distributed throughout the films. Herein, a spatially selective defect management (SSDM) strategy is developed to roundly passivate various defects at different locations within the perovskite film by a facile one-step treatment procedure using a piperazine-1,4-diium tetrafluoroborate (PZD(BF 4 ) 2 ) solution. The small-size PZD 2+ cations could penetrate into the film interior and even make it all the way to the buried interface of CsPbI 3 perovskite films, while the BF 4 − anions, with largely different properties from I − anions, mainly anchor on the film surface. Consequently, virtually all the defects at the surface, buried interface and grain boundaries of CsPbI 3 perovskite films are effectively healed, leading to significantly improved film quality, enhanced phase stability, optimized energy level alignment and promoted carrier transport. With these films, the fabricated CsPbI 3 PSCs based on carbon electrode (C-PSCs) achieve an efficiency of 18.27%, which is among the highest-reported values for inorganic C-PSCs, and stability of 500 h at 85 °C with 65% efficiency maintenance.
研究领域:
材料科学
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能源技术
·
光伏器件
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Weimin Zhou,Zixuan Yu,Wenkai Qu,Tianyu Qi,Kun Wang,Guihai Zhu,Rui Li,Dongying Ju,Yi Zhou,Guiying Xu Xu
Nowadays, using the cheapness catalysts to alternate the noble metal catalysts are becoming the more popular trend than ever before. Carbon materials as an industrial product are getting the more attention due to their excellent stability and conductivity. Thus, searching a method to give the carbon materials electrocatalytic performance is a hot research topic in the world. Our studies attempt to construct the defects on the carbon bones to give the carbon materials hydrogen evolution reaction (HER) performance. Concretely, the topological defects as active sites were successfully constructed on the bones of graphene, through the N-doping and N-removing on the carbon bones of graphene oxide (GO). The defects were verified by the XRD, XPS and TEM measurements. The fabricated APS/NG-1100 shows the obviously enhanced electrocatalytic performance, compared with the APS/GO-800 that is not conducted N-doping and N-removing processes. For instance, in the 1M KOH medium, the hydrogen evolution reaction (HER) overpotential of APS/NG-1100 is 332 mV with a Tafel slope of 38 mV/dec. Meanwhile, it is observed that the HER overpotential of APS/NG-1100 is 337 mV with a Tafel slope of 98 mV/dec in the 0.5 M H2SO4 medium. These results indicate that the constructing the defects on the bones of carbon materials is an effective way to expand the applications of carbon materials as catalysts in the HER field.
研究领域:
材料科学
·
电化学
·
纳米材料
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催化化学
·
能源材料
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Zhenzi Li,Jiaxing Wu,Lijun Liao,Xiangyi He,Baoxia Huang,Shiyu Zhang,Yuxiu Wei,Shijie Wang,Wei Zhou
Rapid charge recombination in hematite (Fe 2 O 3 ) during photoelectrochemical water splitting is a major obstacle to achieving high-efficiency photoelectrodes. Surface defect engineering is considered as a viable strategy for enhancing photoelectrochemical activity of oxide photoanodes. Herein, a one-dimensional (1D) defective γ-Fe 2 O 3 nanorods (DFNRs) photoanode is prepared using solvothermal and high-temperature hydrogenation strategies. The as-prepared DFNRs possess superior visible-light absorption capacity and exhibit excellent photoelectrochemical performance (0.98 mA cm −2 ), with approximately three-fold higher photocurrent density than that of pristine Fe 2 O 3 (FNRs, 0.32 mA cm −2 ). The enhanced activity of the DFNRs results from the moderate formation of oxygen vacancy defects , which promotes spatial charge separation and transfer at the DFNRs/electrolyte interface, as well as the 1D nanorod structure, which favors rapid charge transfer. The surface of γ-Fe 2 O 3 with hydroxyl (OH) groups provides sufficient surface-active sites. This result suggests that surface-oxygen deficiency of γ-Fe 2 O 3 can not only expand the light absorption range but also facilitating photo-generated charge carriers separation. This surface engineering strategy provides an alternative method for preparing stable and highly active metal oxide photoanodes for photoelectrochemical water splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yaoyao Wu,Xiaotao Chen,Jiachun Cao,Yuqing Zhu,Wenjing Yuan,Zhuofeng Hu,Zhimin Ao,Gary W. Brudvig,Fenghui Tian,Jimmy C. Yu,Chuanhao Li
Photocatalysis is a promising technology for energy and environment applications. Herein, a dual-defect heterojunction system of TiO 2 hierarchical microspheres with oxygen vacancies modified with ultrathin MoS 2−x nanosheets (MoS 2−x @TiO 2 -OV) is designed for simultaneously degrading pollutants and evolving hydrogen. MoS 2−x @TiO 2 -OV exhibits a dramatically enhanced photocatalytic activity with a H 2 evolution rate of 2985.16 μmol g −1 h −1 . In treating the simulated pharmaceutical wastewater, MoS 2−x @TiO 2 -OV is capable of purifying various refractory contaminants, with the highest H 2 evolution rate of 41.59 μmol g −1 h −1 during enrofloxacin degradation. While treating the simulated coking wastewater, the catalyst achieves a H 2 evolution rate of 102.72 μmol g −1 h −1 and a mineralization rate of 50%. Computational studies suggest that the dual-defect is superior for the adsorption of H* and producing·OH (‘dual-defect boosted dual-function’). Also, the dual-defect sites significantly boosted the charge-carrier separation and transfer efficiencies. This work highlights the crucial role of defect engineering to develop the energy-recovering wastewater treatment approaches.
研究领域:
环境科学
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材料科学
·
化学工程
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能源化学
·
光催化
·
水污染控制
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纳米材料
·
可持续能源
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Xi Ouyang,Manwen Yao,Xi Yao,Tongqing Yang
The piezoelectric properties of lead-based ceramics can be enhanced by A -site doping with rare earth elements and texture engineering. However, the effects of defect engineering and the mechanism of enhancing the unipolar electrostrain need to be further explored. This study aims to investigate the microscopic properties and changes in defect dipoles in lead piezoceramics with Sm-doping and texture engineering. Specifically, temperature-dependent XRD and Raman tests showed that texture engineering exhibited remarkable structural stability, and a systematic test was conducted on the temperature stability of the piezoelectric constant d 33 , which fully confirmed a significant positive correlation between the temperature stability and the structural stability of the piezoceramics. Additionally, the epitaxial process induced a high density of interfacial defects due to lattice mismatch, which was analyzed by EPR testing. We observed a 41 % increase in the concentration of oxygen vacancies with texture engineering, but this was reduced by 19 % with 1 % Sm-doping. Furthermore, the buffer layer formed by Sm-doping helps to mitigate the rotation of the BO 6 octahedron during the epitaxy process, resulting in a 29 % reduction in Raman peak broadening. The changes in the defect dipole displacement polarizabilities after Sm-doping were also calculated through defect engineering. The mechanism of high unipolar electrostrain was explored by examining the variations between oxygen vacancy concentration, defect dipole displacement polarizabilities, internal bias field, asymmetry, and leakage current. These results demonstrate the feasibility of texture engineering for high electrostrain through defect engineering and have significant implications for optimizing the reliability of piezoelectric devices in high-temperature environments.
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Zhenyu Wang,Xinyu Shen,Chengyuan Tang,Xin Li,Junhua Hu,Jinyang Zhu,William W. Yu,Hongwei Song,Xue Bai
Oleylamine and oleic acid are common organic capping ligands used in the hot injection preparation of perovskite quantum dots (QDs). Their labile nature is responsible for the poor colloidal stability and conductivity that affect the performance of perovskite QD light-emitting diodes (LEDs). We introduced 4-trifluoro phenethylammonium iodide (CF3PEAI) directly in the synthesis and found that CF3PEAI efficiently modified the I– vacancy defects on the QD surface and partially substituted the surface capping ligand oleylamine. The strong electron pulling ability of F in CF3PEAI results in a more positive −NH3+ terminal compared to that of PEAI, which promotes tight bonding of CF3PEAI on the surface of CsPbI3 QDs. As a result, we achieved bright QDs with a photoluminescence quantum yield of 92% and efficient red LEDs. The maximal luminance was improved to 4550 cd m–2 for 685 nm red light, which was nearly 4.6-fold of the LEDs with plain CsPbI3 QDs. Additionally, the peak external quantum efficiency reached 12.5%.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry Letters
·
2021
·
IF 6.475
Li Song,Lixin Huang,Yuan Liu,Xiaoyang Guo,Chong Geng,Shu Xu,Yuanqin Xia,Yuan Zhang,Nannan Luan,Yongsheng Hu
Physical vapor deposition has emerged as a promising strategy for efficient and stable all-inorganic perovskite light-emitting devices (PeLEDs). However, the thermally evaporated PeLEDs still suffer from unsatisfactory optoelectrical performance because of the massive nonradiative defects. Herein, we demonstrate an efficient bilateral interfacial defect-passivation strategy toward high-performance PeLEDs with a thermally deposited CsPbBr3 emissive layer (EML). Specifically, the nonradiative defects from the bulk as well as the EML/charge transport layer (CTL) interface are significantly suppressed by implementing the 3-amino-1-propanol (3AP)-modified PEDOT:PSS and introducing ammonium salts, respectively. Simultaneously, both the 3AP induced less-conductive Cs4PbBr6 and ammonium salts can balance the charge injection into the EML effectively. As a result, we achieved efficient PeLEDs based on thermally evaporated CsPbBr3 with a luminance of 15745 cd/m2, current efficiency of 32 cd/A, external quantum efficiency of 8.86%, and lifetime of 3.74 h. The strategy proposed here may shed light on the development of highly efficient thermally evaporated PeLEDs.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
固体物理学
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Qiuju Fu,Dandan Liu,Weijing Niu,Shuo Zhang,Ruihua Chen,Yujia Wang,Pengze Zhao,Huimin Jiang,Yanchao Zhao,Lingzhi Yang,Liting Yan,Haiyan Wang,Xuebo Zhao
The highly efficient production of furfuryl alcohol (FFA) from biomass-derived furfural (FFR) is attracting increasing attention due to its wide application in the production of value-added chemicals. Zr-based MOF-808 is promising for liquid catalytic transfer hydrogenation (CTH) of FFR to FFA in terms of possessing a great number of Lewis-acid sites. Herein, a series of defective MOF-808 (D x -MOF-808) samples were prepared via a competitive coordination-removal strategy by modulating with benzoic acid (HBC). HBC was introduced as the temporary ligand for competing with formal ligand 1,3,5-benzenetricarboxylic acid (H 3 BTC) to coordinate with metal clusters and then it was removed with methanol to obtain the D x -MOF-808. The results showed that HBC serves not only as a temporary ligand participating in the synthesis of MOF-808 to obtain defective structure but also as a modulator controlling the particle size by terminating the growth of crystals. By changing the amount of HBC addition, the degree of ligand deficiency and the number of exposed Zr sites can be well regulated. Especially, excellent performance of FFR conversion (99%), FFA selectivity (94.4%) and FFA formation rate (48.6 mmol·g −1 ·h −1 ) was achieved over D 40 -MOF-808 sample with 2-propanol as a hydrogen donor under mild conditions (90 °C, 2 h), ranking it the best among the reported catalysts. Detailed characterizations proved that the high activity of D 40 -MOF-808 was jointly influenced by the high surface area, the high content of exposed Zr metal sites and ligand deficiency.
研究领域:
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Xingyan Liu,Tianrong Xiong,Yonggang Xu,Kunhe Yang,Youzhou He,Haifeng Yang,Hong Wu,Jiajia Jing,Siqi Li,Siping Wei
Defect engineering for MOFs is a promising approach to accelerate the charge transfer to further enhance the photocatalytic performance. Up to now, the current defect engineering strategy for MOFs mainly focuses on a single adjustment mode with the apparent ceiling effect, whether the further break out of the ceiling effect could be achieved through the combination of two or more adjustment modes is still in its infancy. In this work, the original NH 2 -MIL-125 was firstly adjusted by a single adjustment mode in ethanol solvothermal method to obtain partially linker defective NM-125-X (where X signifies the distinct temperatures used in the solvothermal treatment, with optimal results observed at X = 120). Subsequently, the NM-125-120 was further re-regulated by adjusting the ligand defects through another adjustment mode in water heating agitation, resulting in the ultimate defective NM-125-120-65. The NM-125-120-65 obtained through double defect engineering avenue showed superior photocatalytic performance with the hydrogen production rate of 11585.23 μmol·g −1 , which was 1.23 and 14.05 times as those of partially defective NM-125-120 (9427.65 μmol·g −1 ) and original NH 2 -MIL-125 (824.85 μmol·g −1 ), respectively. In addition, the NO removal rate of NM-125-120-65 was 64.8 % also higher than that of NM-125-120 (37.8 %) and NH 2 -MIL-125 (23.6 %). Through a series of comparative experiments, especially TGA and XPS, it was noted that the ligand defective NH 2 -MIL-125 can be formed by ethanol solvothermal method, and it was also confirmed that through further re-regulating the ligand defects in water heating agitation, the linker defects could also be further expanded. The PL emission spectra, IT diagrams, and EIS measurements displayed that the NM-125-120-65 had outstanding conductivity and excellent electron mobility compared to NM-125-120 and NH 2 -MIL-125. This work provided a novel approach for the subsequent defect engineering by another adjustment mode based on the existing defective MOFs via double linker defect engineering adjustment modes, so as to further obtain better photocatalytic performance for solving the environmental and energy crisis.
研究领域:
材料科学
·
环境化学
·
能源化学
·
光催化
·
纳米材料
·
物理化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）