Journal of Physical Chemistry C
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2021
·
IF 4.126
Zhaolong Xie,Menghuan Chen,Yangshen Chen,Anxiang Guan,Qing Han,Gengfeng Zheng
The direct conversion of methane to value-added chemicals at ambient conditions is a long-awaited perspective, and the electrocatalytic methane oxidation reaction (CH4OR) offers the potential of utilizing abundant natural gas and renewable energy sources. However, due to the competition of water oxidation and the overoxidation of methane, CH4OR has remained as a significant challenge. In this work, we developed Rh/ZnO nanosheets as an effective catalyst for electrochemical conversion of methane into ethanol. The highly dispersed rhodium nanoparticles provided surface sites for methane adsorption, and ZnO allowed presentation of abundant active oxygen species for methane activation. With a 0.6% Rh doping ratio, the Rh/ZnO nanosheets demonstrated an excellent ethanol production rate of 789 μmol·gcat–1·h–1 at 2.2 V versus reversible hydrogen electrode, corresponding to a Faradaic efficiency of 22.5% and an ethanol production selectivity of 85%, suggesting a promising means for methane utilization at ambient conditions.
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Catalysts
·
2021
·Vol. 11
·期 5
·572
·
IF 4.146
Zhou Zhou,Jing Wang,Chul Gyu Jhun
The preparation of high specific area (86.5 m2/g) ZnO nanospheres with good photocatalytic efficiency via a simple, green and efficient mechanochemical method was reported in this work. The products were characterized by XRD, SEM, TEM, BET and UV–Vis. The ball milling parameters were improved to reduce the agglomeration hazard during the ball milling process, and the specific surface area, band gap and photocatalytic efficiency were investigated in relation to ball milling time. Our study developed the opportunity for the low-cost and facile synthesis of a high specific surface area photocatalyst on a large scale for future industrial applications.Keywords:ZnO;high specific area;mechanochemistry;nanospheres;photocatalytic;RhB
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ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Pan Li,Haifeng Hu,Gan Luo,Shuang Zhu,Lingju Guo,Peng Qu,Qi Shen,Tao He
Crystal facet engineering provides a promising approach to tailor the performance of catalysts because of the close relationship between the photocatalytic activity and the surface atomic and electronic structures. An in-depth understanding mechanism of crystal facet-dependent CO2 photoreduction is still an open question. Herein, two different types of porous ZnO nanocatalysts are used as model photocatalysts for the investigation, which are, respectively, with exposed {110} and {001} facets. The porous ZnO with an exposed {110} facet exhibits superior photocatalytic activity to the one with the {001} facet. Various influencing factors have been thoroughly studied both theoretically and/or experimentally, including light harvesting (i.e., band gap), reduction capability (potential of conduction band), crystallinity, CO2 adsorption ability, CO2 activation, and charge separation. The major influencing factors are eventually figured out based on the experimental and calculation results. The product selectivity and the influence of the hole scavenger can be explained too. Our work may pave a way for directing the future rational design of efficient photocatalysts for CO2 reduction.
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PubMed
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ChemistrySelect
·
2023
·Vol. 8
·期 25
·e202301101
·
IF 2.1
Jiali Zhai,Huan Jiang
Graphical A novel solid-state fluorescent ZnO@SiO 2 nanocapsules powder with a fluorescence quantum yield of 26.8 % has been fabricated and successfully applied to fast latent fingerprint imaging. As advanced fingerprint powders, fluorescent materials generally provide high sensitivity and improved contrast on the pigments or patterned surface, with high resolution. In this study, ZnO nanoparticles are used as fluorescent materials and are homogeneously embedded into SiO 2 matrix to prepare ZnO@SiO 2 nanocapsules. Compared with conventional methods, ZnO@SiO 2 nanocapsules are fabricated using the transparent ethanol solution of ZnO NPs and n-Octyltriethoxysilane without any surfactants. Interestingly, a large number of ZnO NPs can be homogeneously embedded in the silica matrix, reducing the aggregation-induced quenching effect. The maximum emission of the ZnO@SiO 2 nanocapsules powder is located at 530 nm under 325 nm irradiation, and the photoluminescence intensity and the sensitivity of latent fingerprints development depend on the quantity of ZnO NPs in the composites. The prepared fluorescent ZnO@SiO 2 nanocapsules show outstanding property applied as effective fluorescent eikonogens for the high-sensitivity visualization of latent fingerprints on different porous and non-porous substrates. It has been demonstrated that ZnO@SiO 2 nanocapsules compounds combine the admirable adhesion of silica powders to fingerprint residues with the excellent photoluminescence properties of ZnO to form a promising light-emitting material for fingerprint.
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DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 17
·5760-5770
·
IF 4
Shouli Bai,Shiyu Jia,Yingying Zhao,Yongjun Feng,Ruixian Luo,Dianqing Li,Aifan Chen
Photoelectrochemical (PEC) water splitting has been recognized as the most promising approach for directly converting solar energy into chemical energy, and substantial efforts have been made to develop a highly efficient and low-cost photoanode for enhancement of PEC water splitting efficiency due to sluggish water oxidation reaction kinetics. A ternary NiFePB-modified ZnO/BiVO4 heterojunction photoanode was simply assembled by low-temperature hydrothermal, metal–organic decomposition and electrodeposition methods to improve the water splitting efficiency; its photocurrent density for water oxidation reached 1.66 mA cm−2 at 1.23 V (vs. RHE); in comparison, that of ZnO is only 0.4 mA cm−2. The onset potential manifests a cathodic shift of ∼283 mV compared to ZnO. The IPCE and the ABPE respectively are 3.1 and 6.4 times those of ZnO, respectively. This improvement is ascribed to the efficient separation of photogenerated electrons and holes by the formation of a heterojunction between ZnO and BiVO4 and the enhancement in the oxygen evolution reaction kinetics by the decoration of the co-catalyst NiFePB as a hole acceptor.
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DYES AND PIGMENTS
·
2019
·
IF 4.018
Jinpeng Lv,Jianqun Yang,Xingji Li,Ziyi Chai
ZnO and TiO 2 particles are typical pigments used in solar reflective coatings . In this letter, the radiation stability of ZnO and TiO 2 particles within submicron (several hundred nm) and nanoscale (30 nm) size is systematically studied. We reported previously that the 90 nm and 300 nm ZnO particles have nearly a same radiation tolerance (Phys. Status Solidi B 2017, 254, 1600411). Unexpectedly, we found herein that the 30 nm oxides have significant higher radiation tolerance in relation to the submicron particles. Detailed analysis illustrated that the abundant native defects and surface/interface states in oxides nanocrystals , in-situ restored radiation damage through rapid diffusion and annihilation with implantation created vacancies. This work would be beneficial for developing nanoscaled oxides and devices used for space and nuclear radiative environments.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 5
·1738-1745
·
IF 1.637
Li Minjia,Chen Feng,Liu Chengbao,Qian Junchao,Wu Zhengying,Chen Zhigang
Polytetrafluoroethylene (PTFE)/polyvinyl alcohol (PVA)/ZnO composite fiber membranes were prepared by electrospinning, and PTFE/ZnO composite films were obtained after removing PVA. Considering that the spinning solution has good spinning performance, the PTFE/ZnO composite film has good flexibility and durability. The zinc oxide powder is evenly fixed on the surface of PTFE fibers, so that the film’s flexibility will not be affected during high-temperature calcination. The scanning electron micrograph shows that the morphology of the film is similar to the surface of the lotus leaf. The properties of PTFE/ZnO composite films were investigated by hydrophobic angle test and oil–water separation experiments. Results show that the PTFE/ZnO composite film has good hydrophobicity and oil–water separation performance. With the decrease in ZnO, the contact angle of the PTFE/ZnO composite film increased, and the oil–water separation performance improved. When the amount of ZnO added was 0.025 g, the contact angle was 160.9°, and the oil–water separation performance was the best.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2018
·Vol. 86
·期 2
·459-467
·
IF 1.745
Yao Lili,Sun Yu,Weng Wenjian,Lin Jun,Cheng Kui
In the present study, TiO 2 /ZnO composite nanodot films were prepared and the effects of Zn incorporation on light-induced cell detachment were investigated. The nanodots films, which were successfully synthesized by phase-separation-induced self-assembly method, were characterized on the morphology, composition, microstructure, and other properties, and evaluated on cell compatibility and cell detachment performances as well. Live-dead staining was used to study the viability of cell sheet detached by light illumination. Results shows that with the increasing of introduced Zn, the band gap widened and the absorbance in UV region increased, while the crystallinity and performance of light-induced hydrophilicity weakened. All the nanodots films showed good cell compatibility and cell detachment performance induced by light. The nanodots film which had a Zn/Ti molar ratio of 0.03 showed the highest detachment ratio of 91.0% after 20 min ultraviolet illumination. The prepared TiO 2 /ZnO composite nanodots films could be helpful in optimizing light-induced cell detachment behavior.
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OPTIK
·
2019
·
IF 1.914
Benze Wu,Jin Li,Qiang Li
The Mn-doped nano-ZnO powder was successfully synthesized via co-precipitation and vacuum annealing and the scanning electron microscopy (SEM), X-ray diffracton (XRD), ultraviolet visible absorption (Uv–vis) and photoluminescence (PL) of as-synthesized samples were characterized. The SEM and XRD show that the morphology of the synthesized samples was wurtzite nanosheets and nanoparticles at low doping concentration and with increasing Mn-doping concentration, mainly became to nanoparticle with a size of about 50nm. All of the ultraviolet absorption edges of Mn-doped ZnO have blue shift from Uiv-vis spectra and PL spectra show that Mn-doping significantly enhance the visible excitation band compared with pure ZnO, which indicates that Mn-doping not only produces elemental energy levels, but also affects the intrinsic defect energy levels of ZnO.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Xianli Zong,Rong Zhu
This paper reports a high-performance glucose biosensor using ZnO nanorod-based field effect transistor (FET) to continuously monitor glucose concentration. Sensing area reduction of the sensor for minimally-invasive glucose monitoring with high sensitivity and good stability is demonstrated. The biosensor is fabricated via a hydrothermal growth of semiconducting ZnO nanorods between source and drain micro-electrodes incorporating with alternating current (AC) electric-field control. ZnO nanorod structured FET acts as a frequency mixer to transduce glucose concentration into a current change at certain difference frequency, which is measured by a lock-in amplifier. Due to the large surface-to-volume ratio of ZnO nanorods and the advanced frequency mixing detection scheme, good anti-jamming capability and long-term stability are realized. The glucose sensor achieves a high sensitivity of 1.6 mA/(μM-cm 2 ), a glucose concentration detection limit of 1 μM, and excellent long-term stability shown in 38-h continuous monitoring. In contrast to the state-of-the-art glucose sensors, the developed biosensor exhibits competitive advantages in sensitivity, long-term stability, tiny size and fabrication cost, which indicates its promising application potential in wearable continuous glucose monitoring for diabetics.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 31
·1-15
·
IF 2.8
Zhang Yuhong,Liu Yanchang,Qu Zhihao,Liu Junlong,Tian Siye,Liu Hang
In this paper, AuPd alloy nanoparticles (NPs) are prepared by co-reduction method using double reducing agents. Different mass percentages of AuPd alloy NPs loaded ZnO nanomaterials are prepared by classical impregnation method. The gas sensing properties of the sensor are studied. 0.5 wt% AuPd–ZnO exhibits a higher gas sensing response (Ra/Rg = 32, 50 ppm ethanol), which is 1.88 times that of ZnO gas sensing response. At the same time, the response/recovery time is 2 s/29 s. Compared with ZnO, the recovery time is reduced by 55 s. At last, the sensing mechanism in the process of gas sensing test is analyzed based on AuPd alloy NPs and ZnO.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2012
·Vol. 95
·期 7
·2322-2329
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IF 2.272
Wei Chen,Dandan Yu,Hong Ruan,Danzhen Li,Yin Hu,Yibin Chen,Yunhui He,Xianzhi Fu,Yu Shao
To controllably construct ZnO-base heterostructures, unique ZnO hexagonal quasi-hourglasses have been synthesized by a microwave-assisted hydrothermal approach. The phase purity and the morphologies of as-prepared samples have been determined by using X-ray powder diffractometer, field-emission scanning electron microscopy and transmission electron microscopy. We have rationally discussed the growth and reaction mechanism and revealed the morphological evolution of ZnO hexagonal quasi-hourglasses. Dodecylamine, as well as the initial concentration of zinc source, the reaction temperature and time, play an important part in the synthesis of ZnO hexagonal quasi-hourglasses. Between ZnO and Zn 5 (OH) 8 (NO 3 ) 2 , a reversible reaction seldom reported occurs in a circular manner as the reaction proceeds continuously. The presence of ZnO multipods in the products and the controllable synthesis of half of ZnO hexagonal quasi-hourglass betoken a possibility to synthesize ZnO hierarchical architectures, even ZnO-base heterostructures by using this kind of ZnO building blocks.
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