AICHE JOURNAL
·
2022
·Vol. 68
·期 9
·e17738
·
IF 4.167
Xiaoxuan Hou,Kang Huang,Yongsheng Xia,Feiyan Mu,Hongyan Cao,Yu Xia,Yulin Wu,Yuqin Lu,Yixing Wang,Fang Xu,Ying Yu,Weihong Xing,Zhi Xu
Zinc-based flow batteries receive widespread attention due to their advantages of low cost and high energy density. However, zinc dendrites are easy to appear during the charge process, pierce the membrane and thus destroy the battery, which seriously restrict its further development. In this article, MFI-type zeolite nanosheets ( ns -MFIs) with high mechanical strength and hydrophobicity are in situ introduced to porous polymer membranes, which spontaneously form turnup fish-scale-like structure through the one-step phase inversion/surface segregation process. This special structure well disperses mechanical energy to provide effective protection characteristics to resist the penetration of zinc dendrites, and meanwhile promotes the uniform zinc depositions on the electrode by alleviating the water migration and accelerating zincate ion diffusion, so as to prolong the cycle life of the battery for more than 600 cycles, which is 4 times and 2.5 times longer than the commercial Nafion 212 and pristine porous polymer membrane, respectively. Moreover, the sub-nano size pores and high-aspect-ratio of ns -MFIs afford membranes extra ion sieving ability and transport area for the charging-balancing ions OH − to ensure superior battery performance, delivering an average coulombic efficiency (CE) of ~98.5%, voltage efficiency (VE) of ~83.2%, and energy efficiency (EE) of ~81.9% at 80 mA/cm 2 .
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiu-Rong Yuan,Xiao-Song Zhang,Xing-Yao Zhao,Xiao-Kai Gong,Li−Na Kong,Bao-Zeng Zhou,Jian-Ping Xu,Lan Li
The outstanding photovoltaic characteristics of lead halide perovskites have made them a potential class of materials for upcoming optoelectronic applications. However, a major obstacle to the practical use of lead halide perovskites is the inherent toxicity and low environmental stability of lead. The exploration and development of nontoxic and stable alternatives for lead halide perovskites has therefore become an urgent and critical goal in the field of photovoltaics. In this paper, blue lead-free Cs3Cu2I5 nanocrystals (NCs) with bright emission were prepared by using KI as a metal additive through an improved thermal injection strategy. A breakthrough in the previous photoluminescence quantum (PLQY) yield of 97.2% was achieved when the content of KI was optimized to be 8%. Detailed experimental and theoretical studies have also been combined to conclude that the KI additive acts to passivate surface defects and that the broad-spectrum blue emission originates from self-trapped excitons. When combined with commercial indium tin oxide (ITO), the device may achieve broad-spectrum blue electroluminescence. Its low production cost and simple structure are its main features. Furthermore, we were able to improve the utilization of high-energy ultraviolet energy and overcome the weak absorption of short-wavelength silicon-based solar cells by using nanocrystals as down-conversion luminescent materials in conjunction with silicon-based solar cells. This increased the photoelectric conversion efficiency (PCE) for the solar cells through approximately 0.5%. The result was achieved through the principle of down-conversion. Therefore, fully inorganic metal halide Cs3Cu2I5: K+ nanocrystals have great potential for future electroluminescence and photovoltaic applications.
研究领域:
材料科学
·
光电子学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC ELECTRONICS
·
2025
·
IF 2.6
Zhoujian Fan,Kuibao Yu,Hailong Hu
Quantum dot light-emitting devices (QLEDs) exhibit unique advantages for high-resolution display applications. However, as pixel size decreases, challenges including insufficient hole injection and leakage current become increasingly pronounced, resulting in significant degradation in device performance. Herein, dual hole injection layers are constructed by self-assembly of an organic small molecular layer on conventional PEDOT:PSS to smooth the potential barrier, thus achieving more balanced carrier injection. An ultrafine inter-pixel isolation structure is designed as a charge blocking layer surrounding the photolithograpic pixels, with the purpose of effectively mitigating leakage current in the non-emitting region. The high-resolution devices show a high external quantum efficiency (EQE) of 19.6 % and a peak power efficiency (PE) of 20.63 lm/W, both of which significantly exceed the performance of the control device (EQE = 14.6 %, PE = 10.54 lm/W).
研究领域:
光电子学
·
纳米技术
·
材料科学
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS D-APPLIED PHYSICS
·
2021
·Vol. 54
·期 11
·115504
·
IF 3.207
Xi-Kai Yang,Jia-Wei Qiao,Zhi-Hao Chen,Zhen-Chuan Wen,Hang Yin,Xiao-Tao Hao
We adopt inorganic semiconducting CdSe quantum dots (QDs) as a third component in the PTB7-Th:PC71BM-based organic solar cells due to their advantages of strong absorbance, high conductivity, and good solution processability. With the blending of low-dosage CdSe QDs, the short-circuit current density (Jsc) and power conversion efficiencies can be improved by 13% and 11%, respectively, in the ternary device. Compared with the control device, CdSe QDs can effectively modulate the charge dynamics and lead to enhanced fluorescence external quantum efficiency. Moreover, effective Förster resonance energy transfer and fast charge transfer can be observed in the CdSe QD-based bulk-heterojunction (BHJ) films, and therefore improve the overall performance of the organic photovoltaic devices. This work provides an effective method by adopting CdSe QDs to fabricate high-performance PTB7-Th:PC71BM BHJ solar cells.
研究领域:
材料科学
·
光伏技术
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY
·
2019
·
IF 4.674
Xinkai Song,Xichuan Yang,Haoxin Wang,Jincheng An,Ze Yu,Xiuna Wang,Anders Hagfeldt,Licheng Sun
Two push–pull metal-free sensitizers with 5,11-dihydroindolo[3,2- b ]carbazole derivatives as electron-donating groups and 4-(benzo[ c ][1,2,5]thiadiazol-4-ylethynyl)benzoic acid (BTZ) as electron-withdrawing unit, denoted by SK201 and SK202, were synthesized and used for fabrication of dye-sensitized solar cells (DSSCs). SK202 contains a thienyl group between the donor and acceptor, whereas in SK201 the donor and acceptor are connected directly by a single bond. Introduction of a thienyl group improved the planarity of the dye molecule, broadened the absorption spectrum , enhanced the molar extinction coefficient, increased the dye loading on TiO 2 , and accelerated interface electron transfer on TiO 2 . This fine tuning of dye structure improved the performances of DSSCs based on SK202 sensitizers and gave a power conversion efficiency (PCE) of 11.0% ( J sc 16.5 mA cm −2 , V oc 932 mV, and fill factor 71.7%), compared with that of 7.2% for SK201 , under standard AM1.5G solar irradiation (100 mW cm −2 ) with a Co(II/III) complex based redox couple.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 6
·2568-2576
·
IF 9.931
Yingfei Hu,Yangqing Wu,Jianyong Feng,Huiting Huang,Chunchen Zhang,Qinfeng Qian,Tao Fang,Jun Xu,Peng Wang,Zhaosheng Li,Zhigang Zou
For a photoanode, a large overpotential for water oxidation, which limits the solar-to-hydrogen efficiency, may be caused by slow water oxidation kinetics and the recombination of photo-induced electrons and holes. Herein, taking flat and thin BiVO4 photoanodes as an example, the composite AgOx/NiOx electrocatalyst was found to promote not only the water oxidation kinetics, but also the bulk charge separation. As a result, the surface charge injection efficiency (ηinj) and the bulk charge separation efficiency (ηsep) of BiVO4 photoanodes were improved by the composite AgOx/NiOx electrocatalyst. Photo-assisted electrochemical impedance spectroscopy (EIS) was employed to illustrate the significantly reduced surface charge transfer resistance of the BiVO4/AgOx/NiOx sample at the interface between the photoanode surface and the electrolyte. Analysis of the surface potential changes obtained from photo-assisted Kelvin probe force microscopy (KPFM) revealed that the surface photovoltage (SPV) of the BiVO4/AgOx/NiOx photoanode is higher than those of BiVO4/AgOx and BiVO4/NiOx, representing its large band bending region for bulk charge separation. The open circuit photovoltage (OCP) measurements also demonstrated the superior charge separation ability of the BiVO4/AgOx/NiOx photoanode. The possible working mechanism is that one component of the composite AgOx/NiOx electrocatalyst may stabilize the high valence states of the other metal ions, which is beneficial for the formation of water oxidation active sites and the extension of the band bending region.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2016
·
IF 8.539
Xiaoyu Zhang,Chun Sun,Yu Zhang,Hua Wu,Changyin Ji,Yahui Chuai,Peng Wang,Shanpeng Wen,Chunfeng Zhang,William W. Yu
The high photoluminescence efficiency, high color purity, and easy tunable bandgap make inorganic perovskite nanocrystals very attractive in luminescent display applications. Here, we report a color-saturated, red light-emitting diode (LED) using an inverted organic/inorganic hybrid structure and perovskite nanocrystals. We demonstrated that through a simple post treatment to the perovskite nanocrystals with polyethylenimine, the surface defects of the perovskite nanocrystals could be well passivated, leading to great enhancements on their absolute photoluminescence quantum yield and photoluminescence lifetime. Through using a well-passivated perovskite nanocrystal film and optimizing the charge balance, we achieved an electroluminescence LED with a current efficiency of 3.4 cd A–1, corresponding to an external quantum efficiency (EQE) of 6.3%, which is the highest value reported among perovskite NC LEDs so far.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
固体物理
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2022
·Vol. 35
·期 5
·2205262
·
IF 32.086
Runyao Zhao,Yiding Wang,Guipeng Ji,Jiajun Zhong,Fengtao Zhang,Meifang Chen,Shengrui Tong,Peng Wang,Zhonghua Wu,Buxing Han,Zhimin Liu
Electrocatalytic CO 2 reduction reaction (CO 2 RR) offers a promising strategy to lower CO 2 emission while producing value-added chemicals. A great challenge facing CO 2 RR is how to improve energy efficiency by reducing overpotentials. Herein, partially nitrided Ni nanoclusters (NiN x ) immobilized on N-doped carbon nanotubes (NCNT) for CO 2 RR are reported, which achieves the lowest onset overpotential of 16 mV for CO 2 -to-CO and the highest cathode energy efficiency of 86.9% with CO Faraday efficiency >99.0% to date. Interestingly, NiN x /NCNT affords a CO generation rate of 43.0 mol g −1 h −1 at a low potential of −0.572 V (vs RHE). DFT calculations reveal that the NiN x nanoclusters favor *COOH formation with lower Gibbs free energy than isolated Ni single-atom, hence lowering CO 2 RR overpotential. As NiN x /NCNT is applied to a membrane electrode assembly system coupled with oxygen evolution reaction, a cell voltage of only 2.13 V is required to reach 100 mA cm −2 , with total energy efficiency of 62.2%.
研究领域:
电催化
·
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Libo Yu,Zhen Li,Weiqiang Qiao,Junke Wang,Chengshuang Zhao
Light harvesting plays crucial role for high photovoltaic performance of quantum dots sensitized solar cell (QDSSC). However, there are still issues need to be tackled, such as enlarging light response range and enhancing light scattering capability. In this work, TiO 2 eggshell hollow microspheres (EHMS) were synthesized by carbonaceous microspheres (CMS) template method and co-sensitized by CdS/CdSe/PbS quantum dots (QDs) for application in QDSSC . Compared with QDSSC based on TiO 2 nanoparticles (NP) and TiO 2 hollow microspheres (HMS), the TiO 2 EHMS based QDSSC showed a remarkable increase of short-circuit current density (J sc ) to 24.81 mA cm −2 with a power conversion efficiency (PCE) of 4.07 %. Photoelectrochemical analysis of QDSSC indicate that CdS/CdSe/PbS QDs can enlarge the light response range, and the TiO 2 EHMS improve the light scattering, leading to the improvement of light harvesting efficiency. Charges dynamics tests results proved that a larger charges recombination resistance at photoanode/electrolyte interface and longer electron lifetime can be achieved with TiO 2 EHMS, contributing to the boost of J sc . The presented study introduces a simple strategy for researchers interested in designing photoanode for various photoelectrochemical applications.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Hongxin Liu,Min Gong,Wen Li,Xiankan Zeng,Chen Meng,Jin Luo,Weiqing Yang,Sijie Zhang
The bromide-chloride mixed quasi-two-dimensional (quasi-2D) perovskites with high exciton binding energy have demonstrated remarkable potential for efficient blue perovskite light-emitting diodes (PeLEDs). However, challenges persist due to the poor energy transfer efficiency in quasi-2D perovskites and imbalanced charge injection at the interface, which results in notable exciton quenching. This study employs an effective approach termed “systematic synergistic engineering” by introducing 4-guanidinobenzoic acid methanesulfonate (GAMS) into the perovskites and 2-bromoethylphosphonic acid (BPA) molecules at the buried interface, respectively. Benefiting from the high absorption energy with charge defects of the guanidinobenzoic acid (GA) group as a spacer, contributing to a homogeneous phase distribution, the small-sized methanesulfonate (MS) group serves as a synergistic passivator to reduce trap states, which accelerates energy transfer efficiency. Moreover, the BPA buffer layer with strongly electronegative groups not only reduces buried interface defects but also deepens the valence band maximum (VBM) of poly(9-vinylcarbazole) (PVK), ultimately enhancing hole-injection efficiency. As a result, efficient and spectrally stable blue PeLEDs achieve a maximum external quantum efficiency (EQE) of 9.1% and a maximum luminance of 2460 cd m–2 at 480 nm. This work delineates an effective method for the efficient blue quasi-2D 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
产品关联
DOI
PubMed
高影响因子
Nano Research
·
2024
·Vol. 17
·期 6
·5031-5039
·
IF 9.5
Li Wenxiang,Gao Shuo,Yang Chuanruo,Yang Juntao,Nisar Amjad,Xiang Guolei,Jin Junsu
In 2 O 3 is an effective electrocatalyst to convert CO 2 to formic acid (HCOOH), but its inherent poor electrical conductivity limits the efficient charge transfer during the reaction. Additionally, the tendency of In 2 O 3 particles to agglomerate during synthesis further limits the exposure of active sites. Here we address these issues by leveraging the template effect of graphene oxide and employing InBDC as a self-sacrificing template for the pyrolysis synthesis of In 2 O 3 @C. The resulting In 2 O 3 @C/rGO-600 material features In 2 O 3 @C nanocubes uniformly anchored on a support of reduced graphene oxide (rGO), significantly enhancing the active sites exposure. The conductive rGO network facilitates charge transfer during electrocatalysis, and the presence of oxygen vacancies generated during pyrolysis, combined with the strong electron-donating ability of rGO, enhances the adsorption and activation of CO 2 . In performance evaluation, In 2 O 3 @C/rGO-600 exhibits a remarkable HCOOH Faradaic efficiency exceeding 94.0% over a broad potential window of −0.7 to −1.0 V (vs. reversible hydrogen electrode (RHE)), with the highest value of 97.9% at −0.9 V (vs. RHE) in a H-cell. Moreover, the material demonstrates an excellent cathodic energy efficiency of 71.6% at −0.7 V (vs. RHE). The study underscores the efficacy of uniformly anchoring metal oxide nanoparticles onto rGO for enhancing the electrocatalytic CO 2 reduction performance of materials.
研究领域:
电化学
·
纳米材料
·
催化
·
能量转换
·
环境科学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 3
·2308341
·
IF 19
Mingyang Li,Jindi Wang,Jisong Yao,Shalong Wang,Leimeng Xu,Jizhong Song
Although significant progress has been made in improving the external quantum efficiencies (EQEs) of perovskite quantum dot (QD) light-emitting diodes (QLEDs), understanding the degradation mechanism and enhancing stability remain a challenge. Herein, increasing the content of Br-based passivation ligands is shown to enhance the EQE up to 16.1% by reducing the defects of CsPbBr 3 QDs in a Br-rich environment. However, the operational lifetimes of perovskite QLEDs gradually decrease with the increase of halide content, owing to the intensified ion migration under continuous electric field confirmed by the current behavior of QLEDs and time-of-flight secondary-ion mass spectrometry. Furthermore, a thorough analysis of the relationship between electricity and luminance of QLEDs suggests that a small amount of residue oleic acid ligands could weaken ion migration. Accordingly, a halide- and acid-hybrid (HAH) co-passivation strategy is proposed to optimize the content of Br- and acid-based ligands, and achieve a maximum EQE of 18.6% and an operational lifetime ( T 50 , extrapolated) of 213 h for CsPbBr 3 QLEDs. This approach for passivating QDs combines the high efficiency of Br-based ligands with the improved stability of acid-based ligands. The study elucidates the correlation between ligands and device performance, highlighting the significance of two or even multiple ligands for efficient and stable perovskite QLEDs.
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）