ADVANCED FUNCTIONAL MATERIALS
·
2019
·Vol. 29
·期 42
·1903774
·
IF 15.621
Zhongliang Huang,Longlong Fan,Feigang Zhao,Bin Chen,Kaiji Xu,Shu-Feng Zhou,Jinli Zhang,Qingbiao Li,Dan Hua,Guowu Zhan
Hybrid metal oxides with multilayered structures exhibit unique physical and chemical properties, particularly important to heterogeneous catalysis. However, regulations of morphology, spatial location, and shell numbers of the hybrid metal oxides still remain a challenge. Herein, binary Co 3 O 4 /ZnO nanocages with multilayered structures (up to eight layers) are prepared via chemical transformation from diverse Matryoshka-type zeolitic imidazolate frameworks (ZIFs) via a straightforward and scalable calcination method. More importantly, the obtained ZIF-derived metal oxides (ZDMOs) with versatile layer numbers exhibit remarkable catalytic activity for both gas-phase CO oxidation and CO 2 hydrogenation reactions, which are directly related to the sophisticated shell numbers (i.e., Co 3 O 4 -terminated layers or ZnO-terminated layers). Particularly, in situ reflectance infrared Fourier transform spectroscopy (DRIFTS) results indicate that the promotional effects of the multilayered structures indeed exist in CO 2 hydrogenation, wherein the key reaction intermediates are quite different for five-layer and six-layer ZDMOs. For instance, *HCOO is the predominant intermediate over the six-layer ZDMO; on the contrary, *H 3 CO is the crucial species over the five-layer ZDMO. The ZnO/Co 3 O 4 interface should be the active sites for CO 2 hydrogenation to *HCOO and *H 3 CO species, which are ultimately converted to the products (CH 4 or methanol). Accordingly, the work here provides a convenient way to facilely engineer multilayered Co 3 O 4 /ZnO nanocomposites with precisely controlled shell numbers for heterogeneous catalysis applications.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Liusha Cen,Fan Yu,Shixue Liu,Chengcai Li,Wangyong Jin,Chenliang Wang,Hailin Zhu,Yuhai Guo
The technology that catalyst activated perxymosulfate (PMS) has been widely used in the decomposition of organic pollutants. We prepared Zn and Co-based ZIF and obtained C-doping Co 3 O 4 / ZnO heterojunction after pyrolysis. C-doping Co 3 O 4 / ZnO heterojunction with cage core-shell structure was loaded on the polyvinylidene fluoride (PVDF) membranes with a layered porous structure by solvent-assisted nanoparticle embedding (SANE) method, where the carmine degradation reached 99.6 % by MC-430 activated Perxymosulfate (PMS) within 10 min. The influencing factors (such as the pyrolysis temperature, PMS dosage, and dye concentration) on OFX degradation were observed, and MC-430 exhibited good tolerance for these factors and a wide range of solution hydrogen ion concentrations (pH= 4–10). The strong reusability and stability analysis showed that the carmine degradation of the MC-430/PMS system changed minorly (from 99.6 % to 97.7 %) in 5 consecutive cycles without any treatment. The degradation mechanism was confirmed by capture experiments, in which the non-free radical path was the main one and the free radical path was the auxiliary one. Moreover, structure characterizations and density functional theory calculations verified that doped C sites provided a channel for electron transfer from Zn sites to Co sites, which increased the generation rate of reactive oxygen species (ROS) and prolonged the catalyst life. This work provides a new method for the preparation of nonmetallic doping bimetallic strong coupling catalysis.
研究领域:
环境科学
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材料科学
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催化化学
✓ 已验证
产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 7
·376
·
IF 4.2
Xiangxiang Fan,Susu Yang,Chun Huang,Yujie Lu,Pan Dai
In this work, ZIF-8-derived Co3O4@ZnO microspheres were prepared by a liquid-phase concentration-controlled nucleation strategy. The results of the material characterization showed that Co3O4@ZnO microspheres were obtained, and the surface structure could be controlled with the concentration of the ligand. Compared with pure Co3O4microspheres, the operating temperature of optimized Co3O4@ZnO microspheres increased by 90 °C after the gas-sensing test. The response to 50 ppm acetone of Co3O4@ZnO microspheres was 4.5 times higher than that of pure Co3O4, and the detection limit reached 0.5 ppm. Meanwhile, Co3O4@ZnO microspheres showed a shorter response-recovery time and better selectivity. The enhanced-sensing mechanism of the ZIF-8-derived Co3O4@ZnO microspheres was also analyzed.Keywords:gas sensor;microspheres;MOF;ZIF-8
研究领域:
材料科学
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化学传感器
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纳米技术
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产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Yihua Yue,Zhongliang Huang,Dongren Cai,Shafqat Ullah,Abdul-Rauf Ibrahim,Xin Yang,Jiale Huang,Guowu Zhan
Controlled fabrication of spatial positions of different active sites on catalyst structures is critical to exploring the reaction mechanisms for CO 2 hydrogenation. Herein, two isomorphous zeolitic imidazolate frameworks (ZIF-67 and ZIF-8) were used as sacrificial templates to synthesize multi-layered Co 3 O 4 /ZnO catalysts with tunable core-shell structures and well-controlled spatial positions. The multi-layered catalysts were then evaluated for the catalytic performance for CO 2 hydrogenation. A series of characterization techniques were applied to investigate the morphology and structure of the Co 3 O 4 /ZnO composites with different spatial locations. Due to the unique multi-layered structure, the distinct interfacial structures, and the synergistic effects, the resultant core-shell structured Co 3 O 4 /ZnO nanocatalysts exhibited significantly enhanced activity as compared to their monometallic counterparts (pure Co 3 O 4 and ZnO). In addition, the ZnO@Co 3 O 4 with Co 3 O 4 as shell showed significantly higher CO 2 conversion (25%) than that of Co 3 O 4 @ZnO with ZnO as shell (0.82%). Furthermore, in-situ Diffuse Reflection Fourier Transform Infrared Spectroscopy (DRIFTS) analysis suggested that formate (HCOO*) and methoxy (CH 3 O*) species were the crucial intermediates in the CO 2 hydrogenation over the Co 3 O 4 /ZnO composite nanocatalysts. However, pure ZnO could not activate the CO 2 ; consequently, the use of the Co 3 O 4 /ZnO nanocatalysts derived from multiple-layered ZIFs structures provides new insights into improving the catalytic efficiency of CO 2 hydrogenation.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
ACS Sensors
·
2021
·
IF 7.711
Wenjun Yan,Huoshu Xu,Min Ling,Shiyu Zhou,Tong Qiu,Yanjun Deng,Zhidong Zhao,Erpan Zhang
Trimethylamine (TMA) sensors based on metal oxide semiconductors (MOS) have drawn great attention for real-time seafood quality evaluation. However, poor selectivity and baseline drift limit the practical applications of MOS TMA sensors. Engineering core@shell heterojunction structures with accumulation and depletion layers formed at the interface is regarded as an appealing way for enhanced gas sensing performances. Herein, we design porous hollow Co3O4@ZnO cages via a facile ZIF-67@ZIF-8-derived approach for TMA sensors. These sensors demonstrate great TMA resistive sensing performance (linear response at moderate TMA concentrations (<33 ppm)), and a high sensitivity of ∼41 is observed when exposed to 33 ppm TMA, with a response/recovery time of only 3/2 s. This superior performance benefits from the Co3O4@ZnO porous hollow structure with maximum heterojunctions and high surface area. Furthermore, great capacitive TMA sensing with linear sensitivity over the full testing concentration range (0.33–66 ppm) and better baseline stability were investigated. A possible capacitive sensing mechanism of TMA polarization was proposed. For practical usage, a portable sensing prototype based on the Co3O4@ZnO sensor was fabricated, and its satisfactory sensing behavior further confirms the potential for real-time TMA detection.
研究领域:
材料科学
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纳米技术
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传感器技术
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2020
·Vol. 33
·期 4
·477-484
·
IF 1.067
Qi Ling-li,Zhong Chun-yan,Deng Zan-hong,Dai Tian-tian,Chang Jun-qing,Wang Shi-mao,Fang Xiao-dong,Meng Gang
In this work, p-type Co 3 O 4 decorated n-type ZnO (Co 3 O 4 /ZnO) nanocomposite was designed with the assistance of bacterial cellulose template. Phase composition, morphology and element distribution were investigated by XRD, SEM, HRTEM, EDS mapping and XPS. Volatile organic compounds (VOCs) sensing measurements indicated a noticeable improvement of response and decrease of working temperature for Co 3 O 4 /ZnO sensor, in comparison with pure ZnO, i.e ., the response towards 100 ppm acetone was 63.7 (at a low working temperature of 180 °C), which was 26 times higher than pure ZnO (response of 2.3 at 240 °C). Excellent VOCs response characteristics could be ascribed to increased surface oxygen vacancy concentration (revealed by defect characterizations), catalytic activity of Co 3 O 4 and the special p-n heterojunction structure, and bacterial cellulose provides a facile template for designing diverse functional heterojunctions for VOCs detection and other applications.
研究领域:
材料科学
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环境科学
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传感器技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2025
·
IF 6.9
Lin Wang,Haili Huang,Dongdong Zhang,Hung-Chun Wu,Meiling Li,Huilin Hou,Weiyou Yang,Xuhui Yu,Zonghua Wang
Triethylamine (TEA) is a typically volatile organic compound that poses significant environmental and health risks, due to its high toxicity and volatility. Currently, the exploration of TEA sensors based on semiconductor ZnO is still suffered by their intrinsically low sensitivity, slow response/recovery times, and poor selectivity. Herein, we develop the highly-sensitive TEA sensors based on rationally-designed Co 3 O 4 /ZnO p-n heterojunctions, in which the clustered Co 3 O 4 are incorporated into porous ZnO nanosheets. As a result, at the given operating temperature of 260 °C, the as-constructed sensors exhibit an overall enhanced performance with an excellent response of 140.5 to 100 ppm TEA, swift response/recovery times of 6/60 s and high selectivity, representing their promise toward practical applications in advanced TEA sensors.
研究领域:
材料科学
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环境科学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Qi Lei,Xiaowen Zhang,Zhenghongri Zhang,Liuxue Liang,Qihua Liang
Reliable detection of triethylamine (TEA), a hazardous amine compound, is critical for occupational health and environmental safety. Whilst metal oxide semiconductor sensors are favored for their scalability and low cost, their response and selectivity are often limited. Flower-like Co 3 O 4 /ZnO heterojunction microspheres were synthesised via a solvothermal method, and the experimental results showed that the Co 3 O 4 /ZnO-5 mol% sensor has excellent sensing performance. The response value of 50 ppm TEA at 180°C was 387.2, which was 18 times that of the pure ZnO sensor, and it also exhibited excellent selectivity and good moisture resistance. Furthermore, it has a detection limit of ppb and shows long-term stability. This Co 3 O 4 /ZnO sensor was further applied to food freshness assessment, enabling rapid determination of food freshness through quantitative detection of TEA released during the spoilage of fish and meat. Mechanism studies show that the formation of Co 3 O 4 /ZnO heterojunction enhances electron-hole transfer and charge transfer, continuously promotes oxygen activation into chemisorbed oxygen, and provides active sites for the redox reaction of TEA. This study contributes to the application of TEA sensors and accelerates the development of the integration of experiments and applications.
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DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 10
·2237
·
IF 4.6
Bai Sun,Rui Liu,Fengshou Zhao,Shengnan He,Yun Wang,Xiangxiang Wang,Hao Huang,Mingjian Yi,Shuguang Zhu
To address the issues of poor Co2+regeneration and limited interfacial electron transfer in heterogeneous catalytic systems, this study proposes the synthesis of highly efficient and stable Co3O4/ZnO composites through the pyrolysis–oxidation reaction of Co/Zn MOFs for the degradation of rhodamine B (RhB) using activated peroxymonosulfate (PMS). The results confirmed that the catalyst exhibited a high electron transfer capacity, and the synergistic effect between the bimetals enhanced the reversible redox cycle of Co3+/Co2+. Under optimal conditions, complete removal of RhB was achieved in just 6 min using the Co3O4/ZnO composite, which demonstrated excellent stability after five cycles. Furthermore, the catalyst exhibited a high degradation efficiency in real water samples with a total organic carbon (TOC) removal rate of approximately 65% after 60 min. The electrochemical measurements, identification of active species, and X-ray photoelectron spectroscopy (XPS) analysis revealed that non-radicals (1O2and direct charge transfer) played a major role in the degradation of RhB. Finally, the potential mechanisms and degradation pathways for RhB degradation using this catalyst were systematically investigated. This study opens new avenues for the development of efficient and stable PMS catalysts, and provides insights into the preparation of other emerging metal oxides.
研究领域:
环境科学
·
材料化学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nano Materials Science
·
2026
·
IF 20.5
Meng Mei,Kaixin Cheng,Yi Zheng,Bo Yao,Juan Wu,Zilian Zhang,Xinxin Xing,Yude Wang
Early warning of thermal runaway in lithium-ion batteries (LIBs) is a critical challenge for ensuring operational safety. Conventional monitoring approaches based on temperature and voltage are often limited by delayed response and susceptibility to environmental interference. In contrast, gas monitoring presents a promising alternative. Key electrolyte components such as dimethyl carbonate (DMC) are released during the early stages of thermal runaway, preceding gases like hydrogen and carbon monoxide, offering a unique opportunity for early warning. However, current DMC gas sensors are often hampered by the high operating temperatures and the sluggish response/recovery dynamics. In this work, we developed a gas sensor based on a Co 3 O 4 -ZnO p-n heterojunction. Under the operating temperature of 160 °C, the sensor exhibits a high response value of ∼110 to 500 ppm DMC, along with rapid response and recovery times (2 s and 15 s, respectively), as well as excellent selectivity against interfering gases such as H 2 , CO, and so on. The sensor also demonstrates stable performance over 32 d. Material characterization and theoretical calculations reveal that the p-n heterojunction effectively enhances carrier density and oxygen vacancy concentration, thereby facilitating DMC adsorption and electron transfer. Through simulated battery electrolyte leakage experiments, the sensor's capability for real-time and rapid detection of DMC is validated, highlighting its potential as an effective solution for early warning of thermal runaway in LIBs.
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DOI
高影响因子
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