ACS Applied Energy Materials
·
2024
·
IF 5.4
Xiuxiu Li,Enyi Hu,Faze Wang,Peter D. Lund,Jun Wang
Samarium oxide (Sm2O3) is a promising electrolyte for low-temperature fuel cells but lacks further exploration of performance optimization. Herein, we propose an effective approach to strengthen the proton transport characteristics via constructing a heterostructure interface in a Sm2O3/ZnO composite electrolyte. The constructed optimal 6Sm2O3-4ZnO cell device yields an improved peak power density of 920 mW cm–2 and an extended durability performance of 45 h at 500 °C. Experiments confirm the proton conduction, and the density functional theory calculation further discloses the low proton migration energy of 0.35 eV. The semiconductor junction test and theoretical calculation both reveal that the heterojunction exists at the Sm2O3/ZnO interface. The strong local electric field strength of 1.53 × 107 V m–1 at the interface effectively suppresses short circuit and accelerates proton transport, leading to significantly enhanced electrochemical performance. This study indicates that the 6Sm2O3-4ZnO material is a promising electrolyte candidate for fuel cell application.
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IEEE SENSORS JOURNAL
·
2024
·
IF 4.3
Jihua Lu,Litong Yin,Pengyu Liu,Lihui Feng,Hongxing Yin
Ammonia (NH3) has a significant impact on human health, merely 300 ppm of which could pose a risk of irreversible harm to human life. Size and sensitivity are two primary factors for real-time sensing of NH3. Through dry grinding, we develop a novel 61-MHz quartz crystal microbalance (QCM) sensor with dimensions of only 5.0 mm in length and 3.2 mm in width. In this study, the MXene/ZnO heterojunction solution is created using the liquid phase method, and it is uniformly sprayed onto the surface of the QCM. The large specific surface area of the MXene/ZnO heterojunction provides additional adsorption sites for NH3 detection, enhancing sensitivity across a wide dynamic range and offering superior selectivity toward ammonia. At a temperature of 25° C, the sensitivity of the MXene/ZnO sensor for detecting NH3 is 1.319 Hz/ppm, surpassing that of the ZnO sensor (0.166 Hz/ppm). Furthermore, the sensor’s recovery time is significantly reduced from typically 300 s under normal conditions to 40 s after exposure to ultraviolet (UV) light. The proposed QCM sensor boasts advantages of compact size, high sensitivity, short recovery time, and exceptional selectivity for ammonia, which presents a novel solution for detecting harmful gases such as NH3 at room temperature.
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MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Di Wang,Jing Guo,Chunyu Cui,Jianmin Ma,Anmin Cao
The design and synthesis of anode materials with novel structures are one of crucial issues for developing next-generation lithium-ion battery. In this work, carbon nanotube@zinc oxide (CNT@ZnO) composites are synthesized by a liquid-phase method using CNTs as a conductive support. The design of CNT@ZnO composites combines the advantages of both ZnO nanoparticles and CNTs. The optimized CNT@ZnO composite exhibits the superior cycling and rate performance. It could deliver a discharge capacity of 709.2 mAh g −1 at 100 mA g −1 after 50 cycles. The electrochemical results indicate that the as-synthesized CNT@ZnO composite is superior in enhancing the electrochemical performance of ZnO-based anode materials.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2018
·Vol. 20
·期 10
·6959-6969
·
IF 3.906
Fengzhi Wang,Yusong Zhou,Xinhua Pan,Bin Lu,Jingyun Huang,Zhizhen Ye
A series of ZnO nanorod (NR)-reduced graphene oxide (rGO) nanocomposites (NCs) (i.e., ZnO–rGO NCs) with varying rGO loadings were fabricated by electrostatic self-assembly of positively charged ZnO NRs with negatively charged graphene oxide (GO), followed by the hydrothermal reduction of GO to rGO. When compared with bare ZnO NRs, ZnO-5% rGO exhibited significant photoactivity 6 times higher in the photodegradation of rhodamine B (RhB), and 2 times higher than ZnO-5% rGO(H) synthesized by hard integration of GO and ZnO NRs. In the same manner, ZnO-5% rGO exhibited a significant photoactivity 3 times higher in photodegrading phenol, which is 2 times higher than ZnO-5% rGO(H). Furthermore, the adsorption properties of ZnO–rGO NCs towards RhB and phenol were significantly different as a result of the opposite charges of the two pollutants in aqueous solution, which also led to the formation of different key free radicals during the degradation reaction. Based on various characterization techniques, it is concluded that the enhanced photoactivity and photostability of ZnO-5% rGO originated from the synergistic effects between ZnO NRs and rGO nanosheets including higher specific surface area, enhanced photogenerated carrier separation, and strengthened protection effects from intimate rGO coupling. However, these synergistic effects were weaker in ZnO-5% rGO(H) which reflects the key importance of surface charge modification in producing a well-contacted interface.
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ACS Sustainable Chemistry & Engineering
·
2018
·
IF 6.14
Xinyan Wan,Dezhang Ren,Yunjie Liu,Jun Fu,Zhiyuan Song,Fangming Jin,Zhibao Huo
An efficient esterification of succinic anhydride (SA) to dimethyl succinate (DMS) using ZnO in methanol was investigated for the first time. ZnO is commercial, low cost, noncorrosive and environmentally friendly metallic oxide and can promote remarkably the production of DMS from SA in excellent yields with high selectivity. The highest yield of DMS of 100% was achieved at the temperature of 140 °C for 10 h. The results indicated that reaction temperature and time had significant influences on the yield of DMS. Mechanism study found that ZnO was first dissolved to form a Zn species, and then redeposited to ZnO during the reaction, which was crucial for SA conversion. The redeposited ZnO could be reused at least 4 times without the loss of the activity. Moreover, the reaction of ethanol and SA was also effective to give excellent yield at the optimal conditions. The present study demonstrates a promising greener way for the synthesis of DMS from biomass-derived SA.
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Solar RRL
·
2018
·Vol. 2
·期 5
·1700194
·
IF 0
Xingyue Zhao,Heping Shen,Rujie Sun,Qiang Luo,Xin Li,Yu Zhou,Meiqian Tai,Jianbao Li,Yanfeng Gao,Xin Li,Hong Lin
Though high-quality perovskite films can be achieved under low-temperature, the efficient charge selective materials, such as the most widely used TiO 2 , require high-temperature sintering process, hindering mass production with roll-to-roll process by using flexible substrate. Here, a low-temperature (90 °C) process is developed for preparing superaligned ZnO nanorods (SAZNRs), serving as mesostructured scaffold in direct contact with the perovskite layer. By rational design of the length of the SAZNRs, the perovskite solar cell (PSC), reaches a highest power conversion efficiency of ≈13.8% with largely suppressed hysteresis behavior. More importantly, this nano-array design demonstrates outstanding mechanical robustness after being incorporated onto the flexible substrate, resulting in a performance preservation of 90% after 1000 bending cycles with a curvature radius of 4 mm. Finite element analysis indicate that the reduction of device performance after bending is ascribed to the cracks occurred in AZO stress concentration layer, which is attested by experiment as well. Besides, the SAZNRs ETM can be reused for fabricating new perovskite solar cells with comparable photovoltaic performance in a time-saving and scalable manner, paving the way for industrial production of PSCs.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xiaohong Ma,Huacheng Jin,Fei Li,Yuanjiang Dong,Dan An,Danyang Li,Jian Qi,Feifei You,Ming-shui Yao,Fangli Yuan
Although ZnO has potential application in photocatalytic CO 2 reduction, it faces challenges such as limited light absorption range and high recombination of photo-induced electron/hole pairs. Given this, it is necessary to continuously explore new design strategies and optimization approaches to improve the performance of ZnO in photocatalytic CO 2 reduction. In this work, ZnO nanorods (NRs) doped with Cu, Fe, and co-doped Cu/Fe are successfully synthesized through chemical displacement reaction obtaining precursors of uniformly dispersed dopants and subsequent treatments of radio-frequency (RF) thermal plasma technology. The effects of doping species and amounts on the oxygen vacancies and photocatalytic performances of ZnO are systematically investigated. The results indicate that (i) the introduction of metal cation dopants can effectively reduce the intrinsic band gap structure of ZnO, leading to broaden light absorption range in the visible light region and improving light utilization efficiency and (ii) the defects introduced by doping suppress the recombination of photo-generated charge carriers. The synergistic effect of the two aspects improves the photocatalytic activity in CO 2 reduction. Especially, the bimetallic co-doped sample possesses much more oxygen vacancies with a bandgap of 2.71 eV, exhibiting optimal photocatalytic performance and cycling stability. This study has brought breakthroughs and progress in the field of photocatalytic CO 2 reduction, including but not limited to, expanding the synthesis and regulation strategies of metal oxide semiconductor photocatalysts.
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BIOSENSORS & BIOELECTRONICS
·
2011
·
IF 5.361
Yingqiao Teng,Xinai Zhang,Ying Fu,Huijie Liu,Zhongchuan Wang,Litong Jin,Wen Zhang
A novel amplified electrochemical immunoassay based on ferrocene (Fc)-functionalized ZnO nanorods (NRs) was developed in the present work. The detection antibody ( d Ab) and Fc were immobilized onto the surface of ZnO NRs, denoted as { d Ab–ZnO–Fc} bioconjugates. The amount of d Ab and Fc in the bioconjugates was investigated using the copper reduction/bicinchoninic acid reaction (BCA protein assay) and inductive coupled plasma-atomic emission spectroscopy (ICP-AES), respectively. Greatly amplified signal was achieved in the sandwich-type immunoassay when d Ab and Fc linked to ZnO NRs at a proper ratio. Using Escherichia coli ( E. coli ) as a model antigen, the designed immunoassay showed an excellent analytical performance, and exhibited a wide dynamic response range of E. coli concentration from 10 2 to 10 6 cfu/mL with a detection limit of 50 cfu/mL ( S / N = 3). By introducing a pre-enrichment step, the detection of 5 cfu/10 mL E. coli in hospital sewage water was realized. This proposed signal amplification strategy was promising and could be easily extended to monitor other biorecognition events.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Huiling Li,Li Tian,Shuning Yang,Chao Li,Ruidan Li,Yujia Song,Yanjia Guo,Xuwen Li
In this paper, CdTe quantum dots with near-infrared fluorescence (NIR) and hexagonal prism-shaped ZnO were synthesized, and the composites were characterized for their performance. A sensitive molecularly imprinted electrochemiluminescence (ECL) sensor for the determination of mevastatin was constructed based on ZnO@CdTe and molecularly imprinted polymer (MIP). The highest ECL intensity of the system was obtained by ZnO@CdTe as the main luminophores reacted with the co-reactant K 2 S 2 O 8 . The ECL response generated by the reaction of ZnO@CdTe and K 2 S 2 O 8 was used as the basic signal detection platform. The MIP was prepared by the electropolymerization process on the above platform, which laid the foundation for forming the mevastatin cavities with specific recognition sites. In addition, the response mechanism was investigated, and the determination conditions were optimized. The ECL intensity change values (ΔI) of the sensor showed a good linear relationship with the logarithm of mevastatin concentration in the range of 2.0 × 10 −11 to 2.0 × 10 −6 mol L −1 , and the limit of detection was 6.7 × 10 −12 mol L −1 (S/N = 3). This method obtained satisfactory results in the detection of mevastatin in tablets.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2012
·
IF 5.625
Zhizhong Han,Lili Ren,Zhihui Cui,Chongqi Chen,Haibo Pan,Jianzhong Chen
Visible-light driven photocatalyst, Ag/ZnO flower (ZnO Fl) heterostructures, was prepared on indium doped tin oxide (ITO) glass via a simple photoreduction method without surfactants. The samples are characterized by X-ray diffraction, scan electron microscopy, X-ray photoelectron spectroscopy, UV–vis spectroscopy, photoluminescence spectra and photocurrent response. The results show that ZnO FRs are wurtzite phase with single crystalline grown along the [0 0 1] direction and Ag nanoparticles (NPs) located on the surface are metallic. The binding energy of Ag 3d for the Ag/ZnO Fls sample shifts remarkably to the lower binding energy compared with the corresponding value of pure metallic Ag attribute to the interaction between Ag and ZnO Fls. Ag/ZnO Fl heterostructures exhibit higher visible-light driven photocatalytic activity. It is suggested that photo-induced electrons are generated from Ag due to surface plasmon resonance, and transfer from Ag to ZnO Fls. Then the electrons interact with adsorbed oxygen, finally forming hydroxyl radicals ( OH), and the visible-light driven photocatalytic efficiency is enhanced. The proposed mechanism is further confirmed by the photoluminescence and transient photocurrent response. Additionally, the as-prepared Ag/ZnO Fls/ITO as a convenient photocatalytic device can be recycled without centrifugation.
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Physica Status Solidi-Rapid Research Letters
·
2024
·
IF 2.5
Yadong Cheng,Liaoying Zheng,Huarong Zeng,Tian Tian,Xue Shi,Zhenyong Man,Xuezheng Ruan,Guorong Li,Min Zhu
Low working voltage-driven ZnO-based varistor ceramics play an important role in the multilayer chip varistors, which require a low sintering temperature of ZnO varistor for its low energy consumption. Herein, a remarkable reduction of the sintering temperature from the usual 1100–1300 °C to 950 °C is successfully achieves in the ZnO ceramics via a certain 0.05 mol% of Cr 2 O 3 dopants. The underlying mechanism is found to be involved with the formation of basal-plane inversion boundaries between the ZnO grains, which can promote the rapid grain growth within the ceramics. Furthermore, the ZnO varistors with 0.05 mol% Cr 2 O 3 dopant exhibit excellent performance. A low breakdown voltage of 416 V mm −1 , a high nonlinear coefficient of 39, and a low leakage current of 3.4 μA are obtained simultaneously. This work presents an effective and promising approach for the cost-efficient preparation of high-performance ZnO-based varistors, which have particular significance for the application of multilayer chip varistors with low working voltage.
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ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Yunxiang Chen,Xianzhe Zeng,Jingting Zhu,Rong Li,Heliang Yao,Xun Cao,Shidong Ji,Ping Jin
For VO2-based thermochromic smart windows, high luminous transmittance (Tlum) and solar regulation efficiency (ΔTsol) are usually pursued as the most critical issues, which have been discussed in numerous researches. However, environmental durability, which has rarely been considered, is also so vital for practical application because it determines lifetime and cycle times of smart windows. In this paper, we report novel VO2@ZnO core–shell nanoparticles with ultrahigh durability as well as improved thermochromic performance. The VO2@ZnO nanoparticles-based thermochromic film exhibits a robust durability that the ΔTsol keeps 77% (from 19.1% to 14.7%) after 103 hours in a hyperthermal and humid environment, while a relevant property of uncoated VO2 nanoparticles-based film badly deteriorates after 30 h. Meanwhile, compared with the uncoated VO2-based film, the VO2@ZnO-based film demonstrates an 11.0% increase (from 17.2% to 19.1%) in ΔTsol and a 31.1% increase (from 38.9% to 51.0%) in Tlum. Such integrated thermochromic performance expresses good potential for practical application of VO2-based smart windows.
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