Crystals
·
2021
·Vol. 11
·期 11
·1328
·
IF 2.589
Daini Wang,Wenxia Wu,Xiaojun Tan,Bernard A. Goodman,Shoulei Xu,Wen Deng
As a development on previous research on single crystals of Pr3+-doped yttria-stabilized zirconia (YSZ), we report here the preparation and optical properties of Yb/Pr co-doped YSZ single crystals with different Yb2O3concentrations. Results from X-ray diffraction (XRD) and Raman spectroscopy indicated that all of the crystal samples had a cubic phase structure, and transmission was ≥88% in the 550–780 nm range. Photoluminescence (PL) under excitation with a 980 nm laser showed upconversion emission, and several peaks were observed centered on 448 nm, 508 nm, 525 nm, 542 nm, 617 nm and 656 nm. The effects of excited state absorption (ESA), energy transfer upconversion (ETU), cross relaxation (CR), and cooperative energy transfer (CET) on the upconversion luminescence and energy transition mechanism in YSZ crystals were further studied. The fluorescence lifetime of the3P0→3H5transition at 542 nm reached 207 μs, which shows that the samples are of potential use for laser and fluorescence output.Keywords:optical floating zone method;yttria-stabilized zirconia (YSZ) single crystal;Pr/Yb co-doped;upconversion luminescence
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Biomedical Optics Express
·
2023
·Vol. 15
·期 1
·306-318
·
IF 3.4
Lianyu Zhang,Jinhua Liu,Linlin Tian,Dong Zhang,Dong Zhang,Qingru Wang
Plasmonic nanostructures have great potential for improving the radiation properties of emitters. Here, the plasmonic Au nanorods-PVA nanocomposite films are used to uniformly improve the photoluminescence of Tb/Eu co-doped PMMA film within the local micro-region. Under the excitation of 292 nm, the maximum enhancement factor is 37.2-fold for emission at 612 nm and 21.6-fold for emission at 545 nm. Moreover, the finite different time domain simulations are developed to further explain the experimental results. It is indicated that the modulation of luminescence can be attributed to the increase of the local density of optical states through the Purcell effect and the improvement of the energy transfer efficiency between Tb and Eu. Under the excitation of 360 nm, the maximum enhancement factor is about 71.5-fold. In this case, the Au nanorods are mainly used for modulating the emission process at 612 nm, which deduced a greater enhancement factor at 612 nm. This study provides a deep understanding of the interactions between rare earth ions co-doped materials and plasmonic nanostructures, building a bridge to fabricate a useful platform for several applications, such as thin film-based detectors and sensors.
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CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Zhousu Xu,Yijian Yang,Peng Wang,Xiaofeng Liu,Jianrong Qiu
Nd 3+ co-doped CsPbBr 3 perovskite quantum dots (PQDs) glasses were prepared by conventional melt-quenching followed by a thermal treatment process. With the introduction of Nd 2 O 3 to the parent glass, the optical properties of the CsPbBr 3 PQDs are significantly improved. The energy transfer from CsPbBr 3 PQDs to Nd 3+ ions was investigated and confirmed by excitation and emission spectra. The results show that visible excitation band width for the near-infrared (NIR) emission of Nd 3+ ions is significantly increased in the presence of PQDs. The strategy for modulation of the optical properties by the energy transfer between rare earth ions and PQDs in the glass matrix could be further utilized for spectral engineering of photonic glasses for optoelectronic applications.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yuxiang Yang,Xiaocui Huang,Mengyang Dong,Ziling Chang,Hongming Yuan,Yan Huang,Xiangnong Liu,Jianbo Zhang,Anbang Dai
As a common pollutant in the environment, trichloroacetic acid (TCA) is difficult to be completely degraded by common advanced oxidation processes (AOPs) due to its high C-Cl bond content. Advanced oxidation–reduction processes (AORPs) may improve the degradation performance of TCA. In this work, we use Fe 0 Ni 0 bimetal as reducing catalyst, hollow mesoporous silicone nanoparticles (HMONs) modified by ZIF-8 as immobilized carrier, horseradish peroxidase (HRP) and Fe 0 Ni 0 were fixed in the carrier to form a AORP system for degradation of TCA. The effects of temperature, pH, H 2 O 2 concentration, doping ratio on the degradation performance of the catalyst and the degradation mechanism of the composite catalyst were investigated. Degradation experiments showed that H· and OH· were present in the dual system, dechlorination and decarboxylation exist at the same time. Under the condition of 55 °C and pH = 4, 30 mg Fe 0 Ni 0 and 20 mg immobilized enzyme shows the best degradation on TCA, and 81.48 % of 20 mg·L −1 TCA could be degraded by 2 h.
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Catalysts
·
2023
·Vol. 13
·期 4
·715
·
IF 3.9
Dongrui Hou,Jing Luo,Qinggong Sun,Mengyang Zhang,Jianfeng Wang
In this study, Co-modified alkalinized g-C3N4(named Co-CNK-OH) was prepared for the Fenton-like photocatalytic degradation of tetracycline (TC) via a simple yet effective calcination–impregnation method. In all samples of CNK-OH with different Co2+loadings, Co-CNK-OH catalyst with the optimal content (9%) exhibited the highest catalytic activity, with 87.1% tetracycline removal and 50% removal efficiency of the total organic carbon (TOC). Mechanism studies revealed that the 9%Co-CNK-OH catalyst had the lower electrical resistance after alkalization treatment and Co2+modification, leading to a significantly accelerated interfacial charge transfer to the electron acceptor as well as effectively separating electrons and holes. The intermediates generated during the TC degradation in the photo-Fenton process were detected by HPLC-MS, which proved that the holes, superoxide radicals, and singlet oxygen are the key reactive species in the Fenton-like photocatalysis. This study provides a new option for the treatment of TC in wastewater.Keywords:Fenton-like photocatalysis;Co-CNK-OH;tetracycline;reactive oxygen species
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ADVANCED MATERIALS
·
2023
·Vol. 35
·期 25
·2300118
·
IF 29.4
Hongfei Li,Xiaoqi Liu,Donglei Zhou,Biao Dong,Lin Xu,Xue Bai,Hongwei Song
Erbium ions (Er 3+ , 1.54 µm) electric pumped light sources with excellent optical properties and a simple fabrication process are urgently desired to satisfy the development of silicon-based integration photonics. The previous Er-based electroluminescence devices are mainly based on Er-complexes or Er-doped oxide compounds, which usually suffer from low external quantum efficiency(EQE)or high applied voltage etc. In this work, a novel type of Er 3+ /Yb 3+ co-doped lead-halide perovskite films (Er 3+ /Yb 3+ :CsPbCl 3 ) with the maximum photoluminescence quantum yield of 30.12% are prepared by a simple two-step solution-coating method and the corresponding light emitting diodes (Er-PeLEDs) are fabricated, which demonstrate an almost pure 1.54-µm emission and a peak EQE up to 0.366% at a low applied voltage of 1.4 V. Strong negative thermal quenching effect may help Er-PeLEDs suppress Joule heating quenching. These excellent LED properties benefit mainly from the outstanding regulatory performance of acetate to perovskite films, the excellent semiconductor behavior and strong ionic property of the perovskite, and the involvement of Yb 3+ ions, which can directly and efficiently transfer the exciton energy to Er 3+ through a quantum cutting process. Overall, the realization of 1.54-µm Er-PeLEDs offers new opportunities for silicon-based integrated light sources.
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Small
·
2026
·
IF 11.8
Weigang Sun,Zhao Zheng,Lu Liu,Binghui Xue,Jiadong Chen,Yuling Liang,Panchao Yin
Solid polymer electrolytes (SPEs) promise high safety for next-generation energy storage, but practical applications are bottlenecked by the coupling of ion transport with sluggish polymer segmental dynamics. Herein, polymers are co-crystallized with sub-nm anionic metal oxide clusters (MOCs) using Li + counterions, achieving synergistic superionic conduction and mechanical robustness. Mixing MOC (Li 4 SiW 12 O 40 ) and poly(ethylene glycol) (PEG) affords face-centered cubic crystalline structures at high MOC loadings (≥ 60 wt.%). The crystalline framework imposes spatial nanoconfinement that favors a pronounced shift of PEG chains toward densely packed zigzag-like conformations. Relaxation-dynamics studies reveal substantial decoupling between Li + transport and PEG segmental relaxation, thereby enabling a superionic transport regime. The optimized composite achieves an ionic conductivity of 1.1 mS cm −1 at 110°C with an apparent activation energy of 0.32 eV. Since the long-range mobility of SiW 12 4− is constrained, the electrolyte exhibits pronounced single-ion-conducting character with a high lithium-ion transference number (0.79). Furthermore, the composition with inorganic Li 4 SiW 12 O 40 enhances the mechanical modulus (25.04 MPa) and thermal stability with intrinsic flame retardancy. Solid-state symmetric supercapacitors fabricated from the electrolyte exhibit predominantly electric-double-layer capacitive behavior with a high specific capacitance (76 F g −1 ) and excellent rate capability (87.16%).
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Hui-Juan Wang,Bing-Hao Wang,Xiao-Yuan Hu,Sha Bai,Lang Chen,Shuang-Feng Yin
Cu content tunes site occupancy (octahedral or tetrahedral) for active site design. • Cu-Co 3 O 4 -7% induces higher spin Co 3+ , weakens Co–O, boosts O latt reactivity. • Cu-Co 3 O 4 -7% achieves complete CO conversion at 150 °C via O latt -mediated mechanism. • Linking occupancy, spin, bond length to performance for O latt catalyst design. Metal doping represents an effective strategy for modulating the electronic structure of cobalt spinel oxides and tailoring catalytic performance. However, the precise site occupancy of dopants in Co 3 O 4 lattice, octahedral versus tetrahedral, remains a subject of debate, hindering a mechanistic understanding of the promotional role of metal doping. In this study, by adjusting the doping amount of Cu (Cu-Co 3 O 4 -x%, x represents the amount of doped Cu), site-specific incorporation of Cu into either octahedral or tetrahedral sites of Co 3 O 4 was precisely controlled. The resulting Cu-Co 3 O 4 -7% achieves the highest CO oxidation activity under a high gas hourly space velocity. It is revealed that Cu doped in octahedral sites promotes the transition of Co 3+ from low spin to higher spin states. This spin-state transition weakens the Co 3d−O 2p interaction, facilitates lattice oxygen mobility, optimizes CO adsorption, and collectively enhances CO oxidation. This work provides a targeted approach for regulating the Co 3+ spin state and elucidates its critical role in molecular activation processes.
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MACROMOLECULES
·
2023
·
IF 5.5
Bingxue Jiang,Yisong Wang,Zhengqi Peng,Khak Ho Lim,Qingyue Wang,Shengbin Shi,Jieyuan Zheng,Xuan Yang,Pingwei Liu,Wen-Jun Wang
As one of the most promising biodegradable polymers, poly(butylene adipate-co-terephthalate) (PBAT) has attracted immense attention in packaging and mulching film applications. However, their slow degradation performance in aqueous environments remains a great challenge. In this work, we focused on tailoring the chain structure of PBAT by introducing poly(glycolic acid) (PGA) into the copolyester backbone. The PBAT-co-PGA copolyesters with molar percentages of butylene terephthalate of 36.2–50.3 mol % and GA of 8.0–20.2 mol % and number-average sequence lengths of poly(butylene terephthalate) of 1.55–1.97 and PGA of 1.06–1.11 were synthesized using a melt copolycondensation. The number-average sequence length of the PBAT-co-PGAs can be tailored while maintaining the same monomer composition. The PBAT-co-PGAs exhibit higher Young’s modulus (88 MPa) and tensile strength (35 MPa) owing to their better crystallization ability compared with PBAT at the same terephthalic acid fraction. The incorporation of more terephthalic acid and glycolic acid results in an increase of glass transition temperature and the formation of a more rigid chain structure, which is beneficial to improving the water vapor barrier properties of the copolyesters. Importantly, the PBAT-co-PGA copolyesters show enhanced degradation properties in water environments without sacrificing their aging resistance. The synthetic strategy proposed here endows the PBAT-co-PGA copolyesters with a broad chain structure tailoring window, which renders them to exhibit excellent mechanical properties, water barrier, aging resistance, and, most importantly, accelerated hydrolysis performances in aqueous environments.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Shipeng Geng,Liming Chen,Lianmei Kang,Ruchun Li,Haixin Chen,Luo Cheng,Dandan Cai,Yi Wang,Shuqin Song
Developing efficient and durable non-precious metal electrocatalysts with industrial current density is urgent for hydrogen evolution reaction from alkaline water/seawater but remains challenging. Here, a heterostructured Co/W 5 N 4 catalyst with porous structure is innovatively constructed. The theoretical calculations confirm the strong d-p hybridization between Co and N at the interface of Co/W 5 N 4 with the modulation of d‐band center of Co sites. The synergistic effect between Co and W 5 N 4 is disclosed that H 2 O can rapidly dissociate on the W sites to generate H* adsorbed at the Co sites for favorable H 2 production. Consequently, the Co/W 5 N 4 catalyst affords low overpotentials of 113 and 118 mV to drive current density of 100 mA cm −2 in alkaline water/seawater electrolytes, respectively, which are even superior to those of commercial Pt/C. More importantly, it can also present outstanding HER stability at large current density of 500 mA cm −2 for over two weeks (350 h) in alkaline water/seawater electrocatalysis.
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FUEL
·
2023
·
IF 7.4
Jia Li,Sheng He,Le Li,Zhiyuan Shen,Junyi Li,Congling Shi,Bobo Shi,Xiaoyu Chen,Fubao Zhou
Rapid removing toxic CO for methane-air mixture explosions is essential in reducing casualties, but relevant research is rare. This paper proposed a novel approach for efficient CO removal and explosion suppression for methane-air mixture explosions using Co 3 O 4 powder. The effect of Co 3 O 4 powder on the explosion characteristics and basic parameters to quantify the CO removal performance have been studied, mainly including maximum explosion pressure (P m ), combustion time (t c ), flame propagation velocity, and average CO removal rate (R ave. ). Results indicated that explosion intensity and CO concentration decreased significantly with Co 3 O 4 powder, due to increased heat absorption capacity and the active site of CO catalytic oxidation . However, the average CO removal rate decreased as the Co 3 O 4 powder usage and CH 4 partial pressure increased, which could reduce the dispersion degree of the Co 3 O 4 dust cloud. The CO removal was achieved through the CH 4 catalytic combustion and CO catalytic oxidation, which could reduce the CO generation and oxidize the generated CO to harmless CO 2 , respectively. This work provides a novel routine to lessen the explosion hazards and has promising applications in emergency rescue.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Can-Wen Yu,Cong-Yi Du,Ting Ouyang,Xi-Ting Zhang,Zhao-Qing Liu
Physical structure change of catalysts based on the electronic metal-support interaction (EMSI) effects is a prospective strategy to regulate the surface electronic structure of catalysts and further enhance their catalytic performance. To optimize the constrained intrinsic oxygen evolution reaction/oxygen reduction reaction (OER/ORR) activity of spinel MnCo 2 O 4 , we present a facile hydrothermal and photoreduction strategy to synthesize the Ag and MnCo 2 O 4 supported on N-doped carbon nanotubes (Ag-MnCoO/NCNTs) with the EMSI effect. Ag-MnCoO/NCNTs as catalyst shows enhanced performance for OER (overpotential of 340 mV) and ORR (half-wave potential of 0.80 V). Furthermore, a zinc-air battery is assembled based on Ag-MnCoO/NCNTs cathode, which affords an open circuit potential of 1.49 V and favorable cycling performance for 200 h. Theoretical calculations illustrate the introduction of Ag reduces the charge density of the tetrahedral Co site along the direction of the dangling bonds and optimizes the adsorption of oxygen intermediates on tetrahedral Co, thus lowering the reaction activation energy and improving its oxygen catalytic activity. This work provides new insights to guide the fabrication of advanced oxygen electrocatalysts.
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