COMPUTERS AND ELECTRONICS IN AGRICULTURE
·
2023
·
IF 8.3
Qiaolin Liu,Hui Wang,Jiangtao Ji,Wenxuan Zhang,Anqi Wang,Bo Zhao,Zhi Chen
Cadmium ions (Cd 2+ ) are one of the highly poisonous heavy metal ions in the environment, but at present, the detection of Cd 2+ on the market has the disadvantages of complex operation, high detection cost and slow detection speed, so it is urgent to develop rapid and sensitive detection platforms for detecting Cd 2+ . In this study, a novel electrochemical sensor (g-C 3 N 4 /CuNps) was successfully fabricated. g-C 3 N 4 /CuNps composite has a large and unique surface area that is beneficial to the adsorption and preconcentration of Cd 2+ . The experiment parameters such as deposition potential, deposition time, pH of supporting electrolyte, supporting electrolyte, the amount of g-C 3 N 4 /CuNps being coated on the GCE, were optimized. Under the optimized conditions, the electrochemical performances of g-C 3 N 4 /CuNps composites modified sensor have been investigated, which shows excellent wider linear range and lower detection limit (0.098 nM). The linear ranges of Cd 2+ detections were 1-100µgL -1 . Moreover, the sensor shows desirable stability, selectivity, and reproducibility for detecting Cd 2+ . For real water samples, the sensor has a satisfactory recovery rate, indicating that the sensor could be successfully applied in the determination of Cd 2+ in environmental water. Therefore, the designed sensor provides a potential simple and low cost material for electrochemical detection of Cd 2+ .
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CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Hui Gao,Gong Zhang,Dongfang Cheng,Yongtao Wang,Jing Zhao,Xiaozhi Li,Xiaowei Du,Zhi-Jian Zhao,Tuo Wang,Peng Zhang,Jinlong Gong
Electrochemical CO 2 reduction is a sustainable method for producing multicarbon alcohols. However, the selectivity of alcohols is limited owing to the favorable side reaction to convert the key intermediate of *CH 2 CHO into ethylene. This study describes the design of a Cu electrocatalyst with abundant step sites to suppress the deoxygenation of *CH 2 CHO to ethylene, thereby promoting alcohol production. A Faradic efficiency of 40.5% and partial current density of 56.3 mA/cm 2 for alcohols are achieved. Moreover, the alcohols/C 2 H 4 ratio in the products reaches approximately 2.2. In-situ infrared spectrum characterizations and theoretical calculations reveal that the step sites facilitate C–C coupling and direct the reaction pathway to promote the formation of alcohols by inhibiting the cleavage of the C–O bond in *CH 2 CHO. Therefore, the proposed strategy is efficient for designing active sites to steer reaction pathways in CO 2 electroreductions and produce alcohols.
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PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2023
·Vol. 120
·期 42
·e2312091120
·
IF 11.1
Xia Lin,Junwei Zhang,Huihui Yan,Jiaxi Xu,Zhonghao Miao,Guangchang Shu,Shuyuan Zhao,Tianyuan Zhang,Haoxiang Yu,Lei Yan,Liyuan Zhang,Jie Shu
Metal-sulfur batteries have received great attention for electrochemical energy storage due to high theoretical capacity and low cost, but their further development is impeded by low sulfur utilization, poor electrochemical kinetics, and serious shuttle effect of the sulfur cathode. To avoid these problems, herein, a triple-synergistic small-molecule sulfur cathode is designed by employing N, S co-doped hierarchical porous bamboo charcoal as a sulfur host in an aqueous Cu-S battery. Expect the enhanced conductivity and chemisorption induced by N, S synergistic co-doping, the intrinsic synergy of macro-/meso-/microporous triple structure also ensures space-confined small-molecule sulfur as high utilization reactant and effectively alleviates the volume expansion during conversion reaction. Under a further joint synergy between hierarchical structure and heteroatom doping, the resulting sulfur cathode endows the Cu-S battery with outstanding electrochemical performance. Cycled at 5 A g−1, it can deliver a high reversible capacity of 2,509.8 mAh g−1 with a good capacity retention of 97.9% after 800 cycles. In addition, a flexible hybrid pouch cell built by a small-molecule sulfur cathode, Zn anode, and gel electrolytes can firmly deliver high average operating voltage of about 1.3 V with a reversible capacity of over 2,500 mAh g−1 under various destructive conditions, suggesting that the triple-synergistic small-molecule sulfur cathode promises energetic metal-sulfur batteries.
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Journal of Environmental Sciences
·
2023
·
IF 6.9
Yongqi Yan,Xinyu Yang,Ping Ning,Chi Wang,Xin Sun,Fei Wang,Peng Gao,Kai Li
In this study, non-thermal plasma (NTP) was employed to modify the Cu/TiO 2 adsorbent to efficiently purify H 2 S in low-temperature and micro-oxygen environments. The effects of Cu loading amounts and atmospheres of NTP treatment on the adsorption-oxidation performance of the adsorbents were investigated. The NTP modification successfully boosted the H 2 S removal capacity to varying degrees, and the optimized adsorbent treated by air plasma (Cu/TiO 2 -Air) attained the best H 2 S breakthrough capacity of 113.29 mg H 2 S/g adsorbent , which was almost 5 times higher than that of the adsorbent without NTP modification. Further studies demonstrated that the superior performance of Cu/TiO 2 -Air was attributed to increased mesoporous volume, more exposure of active sites (CuO) and functional groups (amino groups and hydroxyl groups), enhanced Ti-O-Cu interaction, and the favorable ratio of active oxygen species. Additionally, the X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) results indicated the main reason for the deactivation was the consumption of the active components (CuO) and the agglomeration of reaction products (CuS and SO 4 2− ) occupying the active sites on the surface and the inner pores of the adsorbents.
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LANGMUIR
·
2023
·
IF 3.9
Yang Xiang,Zan Liu,Zhilin Cheng
Herein, we successfully constructed a Cu+-doped PVA-derived mesoporous carbon@diatomite (DE) composite by virtue of N2-suffered carbonization and self-reduction at a high temperature. The structure and composition of C/Cu@DE composite adsorbents were determined by a series of characterizations. The results affirmed that Cu+ species are highly scattered in PVA-derived mesoporous carbon, which covered the DE surface. The effect of carbonization temperature on the structure and composition of the C/Cu@DE composite adsorbents were intensively investigated, indicating that the C/Cu@DE composite at an 800 °C carbonization temperature (C/Cu@DE-800 °C) showed the formation of many Cu+ species and preferable hierarchical pore properties. The adsorption experiments of benzothiophene (BT) indicated that C/Cu@DE-800 °C possessed a better adsorption capacity. The adsorption behavior of BT onto C/Cu@DE-800 °C was investigated by a variety of adsorption times, initial concentrations, and recycle times, of which the largest adsorption capacity for BT attained 34.2 mg/g. Furthermore, the adsorption kinetics, intraparticle diffusion, adsorption isotherms, and adsorption thermodynamics of BT onto C/Cu@DE-800 °C was deeply studied, which contributed to the proposed adsorption mechanism.
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Advanced Energy Materials
·
2023
·Vol. 13
·期 42
·2302692
·
IF 27.8
Qingyu Wang,Yida Zhang,Minxi Lin,Hengwei Wang,Yu Bai,Chengyuan Liu,Junling Lu,Qiquan Luo,Gongming Wang,Hai-Long Jiang,Tao Yao,Xusheng Zheng
Metastable structures are promising candidates for efficient catalysis owing to abundant active electronic states, strong electronic coupling with reactants, and energetic preference. Exerting the value of metastable structures while evading the difficulty in direct synthesis remains challenging. Herein, it is reported that light irradiation enables the generation and maintenance of the metastable state over copper single atoms for efficient carbon dioxide reduction. Under irradiation with light, photogenerated electrons transit to Cu-3 d orbits and initiate d -orbital rearrangement. The initial symmetric Cu 1 ─O 4 coordination converts to the metastable asymmetric structure of Cu 1 ─O 2+1 , and is reversibly restored after removing the light. The photoinduced metastable intermediate of Cu 1 ─O 2+1 promotes the Cu single-atom catalyst to deliver an ethylene yield rate of 60.4 µmol g cat. −1 h −1 . Mechanistic studies reveal that Cu 1 ─O 2+1 possesses stronger adsorption capability for reactants and intermediates. The reaction energy barrier over Cu 1 ─O 2+1 also shows an obvious decline compared to that over Cu 1 ─O 4 .
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Nanomaterials
·
2023
·Vol. 13
·期 17
·2478
·
IF 5.3
Ning Wang,Yuanyuan Zhao,Xuelian Wu,Dapeng Li,Ruguang Ma,Zhigang Chen,Zhengying Wu
In this study, a Cu NPs-incorporated carbon-containing mesoporous SiO2(Cu/C-SiO2) was successfully synthesized through a grinding-assisted self-infiltration method followed by an in situ reduction process. The obtained Cu/C-SiO2was then employed as a Fenton-like catalyst to remove tetracycline (TC) from aqueous solutions. TEM, EDS, XRD, N2adsorption–desorption, FTIR, and XPS methods were used to characterize the crystal structure, morphology, porosity, chemical composition, and surface chemical properties of the catalyst. The effects of initial TC concentration, catalyst dosage, H2O2dosage, solution pH, HA addition, and water media on the TC degradation over Cu/C-SiO2were investigated. Scavenging and electrochemical experiments were then carried out to analyze the TC degradation mechanism. The results show that the Cu/C-SiO2can remove 99.9% of the concentrated TC solution (C0= 500 mg·L−1), and it can be used in a wide pH range (R.E.= 94–99%, pH = 3.0–11.0). Moreover, hydroxyl radicals (•OH) were detected to be the dominant reactive species in this catalytic system. This study provides a simple and promising method for the synthesis of heteroatom-containing mesoporous catalysts for the decomposition of antibiotics in wastewater.Keywords:Cu nanoparticles;mesoporous silica;Fenton-like catalyst;tetracycline
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Xiaoli Zhuang,Chao Han,Jingrui Zhang,Zhaohu Sang,Wei Meng
Metal/metal oxide heterojunctions with diverse combination is significantly desirable in constructing excellent electrochemical platform in the sensing field. In this paper, a ternary composite of Cu/Cu 2 O@C, in which a Cu/Cu 2 O heterojunctions with “head to head” combination fashion uniformly disperse in the octahedral carbon framework, is in situ generated by treating a copper-metal-organic framework (Cu-MOF) under a relatively mild temperature. The Cu/Cu 2 O@C composite is used as electrode material to modify glassy carbon electrode (GCE) to construct a glucose sensor, which shows excellent sensing behaviors with high detection sensitivities of 621.12 μA mM −1 cm −2 and 372.67 μA mM −1 cm −2 in the glucose concentration of 0.001–1.7 mM and 1.7–9.7 mM, respectively. Meanwhile, the Cu/Cu 2 O@C/GCE also exhibits outstanding selectivity for glucose as well as good stability, repeatability and practicability in the test process. The good sensing performances could attribute to the unique characteristics of Cu/Cu 2 O@C: (i) the highly dispersed Cu/Cu 2 O nanoparticles originating from metal-organic framework provide abundant catalytic-sites for the glucose oxidation ; (ii) the “head to head” combination fashion for Cu/Cu 2 O heterojunctions make Cu and Cu 2 O fully participate in the electrocatalytic oxidation for glucose. (iii) the in situ generated carbon framework promotes the charge transfer in the electrocatalytic process.
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FUEL PROCESSING TECHNOLOGY
·
2021
·
IF 7.033
Xiangchen Kong,Chao Liu,Weicong Xu,Yue Han,Yuyang Fan,Ming Lei,Ming Li,Rui Xiao
Stubborn lignin (SL) is the thermochemically stable fragment generated from biomass utilization (e.g., pyrolysis , hydrolysis, fermentation, pulping), which is comparatively difficult to be further depolymerized into value-added bio-products. The cleavage of the stubborn linkages within the structure of SL, such as C C, α -O-4, and 4-O-5 linkages, is the key for its valorization. Herein, we investigated the depolymerization of SL through catalytic hydroprocessing in supercritical methanol with Cu/CuMgAlO x catalyst. The yield of monomers reached 37.76C% with 240 min at 300 °C. Cyclohexanols were identified as the major monomeric products, indicating the occurrence of hydrodeoxygenation and hydrogenation. GPC , quantitative 13 C NMR, HSQC NMR, and HMBC NMR analyses evidenced the depolymerization of SL and upgrading of its derivatives. Furthermore, the mechanistic studies were carried out to provide insights to the stubborn linkage cleavages. The degrees of difficulty to break up the three involved linkages obeyed the sequence of β -5 > 4-O-5 > α -O-4. The apparent activating energies ( E a ), chemisorption energies ( E c ), and bond dissociation energies (BDE) were determined computationally to support the experimental results from the perspectives of kinetics, chemisorption, and thermodynamics, respectively. This research provides a reliable way for the utilization of SL.
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Journal of CO2 Utilization
·
2021
·
IF 7.132
Ziyi Zhao,Xiaotong Li,Jianghao Wang,Xiangzhou Lv,Hao Bin Wu
Electrochemical reduction of carbon dioxide to value-added fuels offers a promising method to solve increasingly serious environmental problems and alleviate energy crisis. Herein, we report a facile method by coating Cu electrode with CeO 2 nanoparticles to largely enhance the C 2+ products selectivity during CO 2 electroreduction. The Faradaic efficiency of C 2+ products for optimal CeO 2 -coated Cu electrode reached a high value of 61 % at -1.05 V vs RHE, and exhibited good stability for over 9 h of CO 2 electrolysis. The CeO 2 nanoparticles were found to induce oxidative corrosion of the Cu foil, leading to a CuO x layer in contact with the CeO 2 nanoparticles. The interface between CeO 2 nanoparticles and oxide-derived Cu might be attributed to the enhanced catalytic activity for C 2+ products by promoting the C C coupling process.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 8
·087503
·
IF 4.316
Fangzhao Pu,Zhipeng Yu,Wenjing Lu,Chuncai Kong,Ruijun Lin,Xingyu Bai,Xiaojing Zhang,Jian Lv,Zhimao Yang
Fast, reliable, and low-cost glucose detection methods are of great importance for the control of diabetes. In this study, Cu2O combined with Cu nanoparticles anchored on reduced graphene oxide (RGO), was synthesized to function as the electrode in a non-enzymatic glucose sensor. The synergistic effect between Cu nanoparticles and Cu2O, together with the high conductivity of RGO enabled considerably lower resistivity with greater glucose oxidation activity than pure Cu2O. The RGO@Cu2O@Cu electrode exhibited a high sensitivity of 1.112 mA mM−1 cm−2 with a detection limit of 0.019 μM, and the linear range is up to 4 mM. Additionally, the RGO@Cu2O@Cu electrode displayed good anti-interference performance within human blood and high stability while operating for a long duration. Significantly, the glucose detection capability of the as-designed electrode was comparable to commercial sensors, representing a valuable design for future non-enzymatic glucose sensing.
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Materials Express
·
2020
·Vol. 10
·期 10
·1725-1731
·
IF 1.65
Duan Xiaobo,Ding Yanhong,Yu Meng
Multilayer graphene was prepared in this study by microwave burst method. Cu9S5/CoS/graphene and CuS/CoS2/graphene composites were obtained by hydrothermal method to regulate the molecular structure and combination of Cu and Co metal sulfides on graphene
substrate. Graphite oxide was doped by hydrothermal method, and then Cu9S5/CoS/graphene composite was prepared by microwave explosion method. Raman, SEM and TEM were used to characterize the self-made graphene. Results showed that the multilayer graphene had a bag-like
structure which was beneficial to anchor sulfide. Three graphene-based composites were characterized by scanning electron microscopy, X-ray diffraction, energy spectrum analysis and electrochemical properties. Moreover, results showed that CuS/CoS2/graphene had the best electrochemical
performance, and its specific capacity reached 324 F/g when the current density was 1 A · g–1, which was much higher than that of the other two samples. Capacity retention rate, interfacial charge transfer resistance and electrolyte diffusion resistance also have advantages.
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