APPLIED ORGANOMETALLIC CHEMISTRY
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2023
·Vol. 37
·期 4
·e7027
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IF 3.9
Rui Wang,Shu-Hui Yin,Bi-Liu Lan,Heng-Huan Ruan,Zhi-Hui Qiu,Zhong Zhang
Two cyclen-based multidentate N,O ligands, 1,4,7,10-tetrazazcyclododecane-N,N′,N″,N″′-tetra- p -methylbenzoic acid (H 4 L 1 ) and 1,4,7,10-tetrazazcyclododecane-N,N′,N″,N″′-tetra- p -cinnamic acid (H 4 L 2 ), were reacted with Zn (II) salts leading to a four-fold interpenetrated 3D binodal PtS-type network {[Zn 2 (HL 1 )Cl]·5H 2 O} n ( Zn-1) along with a 1D ribbon-like polymeric chain {[Zn 3 (HL 2 )Cl 3 (H 2 O) 2 ]·2CH 3 COCH 3 ·3H 2 O} n ( Zn-2 ). Both two compounds exhibited excellent water stability in a wide pH range from 2 to 12 and emitted either UV or visible blue-purple light. They can behave as recyclable fluorescent probes for highly selective sensing of nitrophenols with low detection limits. Additionally, the blue-purple emission of Zn-2 can be efficiently quenched by PA with a concentration as low as 20 μM; thus, the naked-eye detection of PA can be fulfilled under a 365 nm UV lamp. Based on the DFT calculation and spectral analysis evidences, it can be proposed that the selective detection of nitrophenols by two Zn (II) compounds is owing to a synergistic effect of different quenching mechanisms along with the interactions between probes and analytes.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Chunyu Peng,Jiankang Chen,Mengmeng Jin,Xiaoying Bi,Chang Yi,Shiming Zhang,Xinye Xu,Weilan Liu,Xiang Liu,Linfei Lai
Carbon materials as catalyst substrates play key roles in Zn-air batteries which not only construct abundant tri-phase interfaces for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) to take place but also enable the diffusion of reactants. Carbon corrosion is known to occur in the aqueous electrolyte which leads to catalysts dissolution, electrode flooding, and rapid performance degradation . In this study, rechargeable Zn-air batteries with MnO 2 as the bifunctional catalysts and different carbon as catalyst carriers, such as carbon black, CNTs , and graphene have been assembled with their electrochemical performance systematically evaluated. The correlation between the graphitization , surface, structure properties of the carbon, and the electrochemical performance of air-electrodes has been elucidated. The electrolyte composition change during cycling and the underlying corrosion mechanism of carbon have been explored. CNTs with high crystallinity and less edge exposure is an excellent candidate over activated carbon and graphene as a catalyst carrier for metal-air batteries.
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Journal of Physical Chemistry C
·
2022
·
IF 4.177
Yuhan Zou,Xianzhong Yang,Zaikun Xue,Yiwen Su,Changpeng Qiao,Wenyi Guo,Ziang Chen,Jingyu Sun
The unsatisfactory cycling stability of Zn anode stemming from dendritic growth and side reactions has slowed the rapid development of aqueous Zn-ion batteries (AZIBs). Constructing a three-dimensional (3D) artificial interphase layer is an appealing solution since it could dictate Zn deposition at the interface. Here, the in situ growth of a Cu-based metal–organic framework (Cu-MOF) over commercial Zn foil followed by subsequent selenization endows selenized Cu-MOF (SCM) with a stabilized Zn anode. The 3D SCM coating could homogenize the electric field and function as a reservoir to tolerate the deposited Zn. As a result, both rampant dendritic propagation and the notorious side reactions are concurrently inhibited. The SCM@Zn symmetric cell displays an elongated cyclic life for over 500 h at 2.0 mA cm–2. The assembled AZIB full cell readily realizes high electrochemical reversibility under different current densities. Our investigation offers insights into the design of a protective layer for high-performance Zn anodes.
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Xukai Li,Weirui Chen,Dongpo Liu,Gaozu Liao,Jing Wang,Yiming Tang,Laisheng Li
Due to its low interfacial electron migration ability and highly hydrophilic, Fe-MCM-41 (FeM) had poor activity and stability during catalytic ozonation . To this end, the secondary metal Zn and Si-F group were introduced into the framework of FeM to create surface potential difference and hydrophobic sites. Comparative characterizations showed that there existed rich acid sites with great potential difference on F-Fe-Zn-MCM-41 (FFeZnM). Additionally, because of the existence of hydrophobic and electron-withdrawing Si-F unit, the electron migration ability, hydrophobicity and acidity of FFeZnM were enhanced. The greater O 3 mass transfer was induced by Si-F group and O 3 was directly activated at Fe and Zn Lewis acid sites into •OH, •O 2 - and 1 O 2 . With •OH acting as main species, FFeZnM/O 3 achieved the superior IBP removal (93.4%, 30 min) and TOC removal (46.6%, 120 min) over those of sole O 3 and F-FeM/O 3 processes, respectively. HCO 3 - , Cl - , NO 3 - and SO 4 2- hindered IBP degradation by FFeZnM/O 3 , but high concentration humic acid (HA) exhibited promotion by forming HA-IBP complex. IBP degradation by FFeZnM/O 3 was enhanced with tap water , river water, and effluent from the secondary sedimentation tank of the sewage plant acting as medium. This study proposed an innovative approach to catalyst design for catalytic ozonation.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Han Zhang,Xi-Hui Diao,Chao Chen,Yaseen Muhammad,Yuan-Yuan Gao,Xiao-Jing Dong,Hao Wang,Wei Li,Chuan-Song Qi
The reactions of 1,2-bis(4-pyridyl)ethylene (bpe) and 2,5-furandicarboxylic acid (H 2 fdc) with Zinc(II) salts in different concentrations resulted in two new complexes, [Zn(fdc)(bpe)]∙DMF ( 1) and [Zn 4 (fdc) 4 (bpe) 4 (H 2 O) 2 ] ∙DMF·2H 2 O ( 2) . At lower concentrations, 1 was formed, in which {Zn 2 (CO 2 ) 2 } can be seen as a 6-connected node, and the whole framework is a 2-fold interpenetrated pcu network. On the contrary, at higher concentrations, 2 was synthesized, in which all Zn 2+ ions act as 4-connected nodes, and the whole framework is a 5-fold interpenetrated dia network. 1 and 2 are proven to be promising sensors towards Fe 3+ ions with high sensitivity and selectivity through fluorescence quenching.
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KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 7
·1744-1752
·
IF 3.146
Li Feifei,Dong Jiale,Wang Mingyue,Lin Xingtao,Cai Weijie,Liu Xianyun
This work is mainly concerned with the synthesis of Co-Zn nanocomposites by employing MCM-41 silica as hard template (CoZnO-HT) and its catalytic behavior toward to CO 2 reforming with ethanol. The physicochemical features of the as-prepared catalysts were probed through various characterization techniques, including XRD, TEM, BET, H 2 -TPR, and XPS. Indeed, CoZnO-HT catalyst possessed a highly ordered mesostructure with similarity to MCM-41 template and a higher specific surface area (304 m 2 /g) compared to the reference CoZnO-C sample (4.75 m 2 /g) prepared by the conventional impregnation method. Consequently, CoZnO-HT exhibited good performance at low temperature, and full ethanol conversion could be achieved at 550 °C as well as the negligible formation of byproduct acetone. In addition, this catalyst depicted good stability and no obvious deactivation was observed after 40 h time on stream tests under the stoichiometric feed ratio. Indeed, superior specific surface area and efficient mass transport within the mesopores might be critical factors assigned to better activity and stability for CoZnO-HT.
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ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Jianghua Wu,Waseem Raza,Peng Wang,Arshad Hussain,Yangbin Ding,Jian Yu,Yanyan Wu,Jie Zhao
A one-pot and energy-saving method was developed to manufacture defective manganese oxide materials. The insertion of zinc ions improves manganese oxide conductivity results in a significant increase in number of defects in the lattice to provide abundant active sites for energy storage. The synthesized zinc doped manganese oxide achieved a maximum capacity of 392 F g −1 in the three-electrode system, the corresponding supercapacitor reached an outstanding energy density of 55.28 Wh kg −1 at a power density of 555.6 W kg −1 , while maintaining 95.2% of the initial capacity after 10,000 cycles. This research sheds new insights to the preparation of defective materials by a simple one-step method for energy storage applications.
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Frontiers in Chemistry
·
2022
·
IF 5.545
Zhang Xiaojuan,Yu Rongfei,Wang Dandan,Li Weihua,Zhang Yutao
A series of bimetallic Zn-Zr metal-organic frameworks (Zn-Zr MOFs) with different Zn:Zr molar ratios has been synthesized via a green hydrothermal method. The structures and morphologies of these photocatalysts have been characterized and analyzed by FTIR, XRD, SEM, and nitrogen adsorption-desorption. The prepared Zn-Zr MOFs had large specific surface areas and pore volumes, favoring the adsorption of pollutant molecules, which in turn led to an improved photocatalytic effect. The photocatalytic activities of the Zn-Zr MOFs under visible light irradiation have been studied towards rhodamine B (RhB) as a target pollutant. The extent of degradation of RhB in a 40 mg/L aqueous solution reached 97.4%. The optimal photocatalyst could also degrade other dyes, suggesting a certain degree of universality.
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Materials Today Communications
·
2022
·
IF 3.662
Jiawei Cao,Yue Li,Xuyu Chen,Dongren Cai,Shu-Feng Zhou,Guowu Zhan
The preparation and application of inorganic-organic hybrid nanomaterials is a hot research topic at present. Herein, we combined Zn-Al layered double hydroxide (Zn-Al LDH) with mesoporous polydopamine (MPDA) to prepare two integrated Zn-Al LDH@MPDA nanocomposites under the modification of linker (1,3,5-benzoyl chloride (TMC) or (3-aminopropyl) trimethoxysilane (APTMS)), namely Composite T (modified by TMC) and Composite A (modified by APTMS), which were then evaluated for dye adsorption, adriamycin hydrochloride (DOX) loading, photothermal conversion experiment, and antibacterial test. The characterization results showed that MPDA can be successfully loaded on Zn-Al LDH with the modification of the two linkers, but the specific surface area, pore-volume, average pore size, and electronegativity of Composite T were all higher than those of composite A, thus being more advantageous in adsorption of cationic dye. Composite T possesses a high loading capacity for DOX, whose loading efficiency and encapsulation efficiency are 478.3% and 95.7%, respectively. In addition, Composite T also shows a high photothermal conversion efficiency of 27.9%. Furthermore, Composite T exhibits excellent antibacterial activity against Escherichia coli ( E. coli ) and Staphylococus aureus ( S. aureus ). Therefore, the designed Zn-Al LDH@MPDA nanocomposites would be a promising candidate for a myriad of industrial application fields.
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JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Yi Liu,Ying Chen,Yunli Liu,Zewen Chen,Huan Yang,Zhongxiao Yue,Qing Fang,Yunfei Zhi,Shaoyun Shan
Solar energy is considered as the cleanest, cheapest, and most sustainable energy source, and CO 2 cycloaddition that is drove by solar energy has unique advantages in the aspect of energy and environmental. Therefore, Zn and N co-doped porous carbon nanosheets (ZNCs), which were synthesized by a simple one-step pyrolysis method, as catalysts and photothermal material to photothermally drive cycloaddition of CO 2 . The prepared ZNCs show graphene-like layered structure, uniformly distributed Lewis acid (Zn atoms) sites and Lewis base (N atoms) sites, full spectrum absorption and high photothermal conversion efficiency. More importantly, ZNCs have a higher catalytic efficiency than traditional heating methods because it can be quickly in-situ heated by light, hence the yield of cyclic carbonate reached 91.1% (0.1 MPa CO 2 , 1000 mW·cm −2 full-spectrum irradiation, 12 h). ZNCs were recycled five times without significant reduction in catalytic efficiency, and have high activity to other series of epoxides. A possible CO 2 cycloaddition mechanism which is catalyzed by ZNCs is proposed, including the step of adsorption, ring opening, insertion and cyclic carbonates formation.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Qikai Huang,Xiongwei Zhong,Qi Zhang,Xin Wu,Miaolun Jiao,Biao Chen,Jinzhi Sheng,Guangmin Zhou
Zinc-air batteries (ZABs) with high energy density and safety are promising as next-generation energy storage systems, while their applications are severely hindered by the sluggish reaction kinetic of air cathodes. Developing a bifunctional catalyst with high activity and durability is an effective strategy to address the above challenges. Herein, a Co 3 O 4 /Mn 3 O 4 nanohybrid with heterointerfaces is designed as advanced cathode catalyst for ZABs. Density functional theory calculations show the heterogeneous interface between Co 3 O 4 /Mn 3 O 4 can improve the dynamics of carrier transport and thus enhancing the catalytic activity and durability. The Co 3 O 4 /Mn 3 O 4 catalyst anchored on reduced graphene oxide (rGO) exhibits high oxygen reduction reaction (ORR) activity with a half-wave potential of 0.86 V, and excellent oxygen evolution reaction (OER) activity with the potential of 1.59 V at 10 mA cm −2 , which are comparable to the commercial noble metal catalysts. The improved ORR/OER catalytic activity is ascribed to the synergistic effect of heterointerfaces between Co 3 O 4 and Mn 3 O 4 as well as the improved conductivity and contact area of oxygen/catalysts/electrolytes three-phase interface by rGO. Furthermore, a home-made ZAB based on Co 3 O 4 /Mn 3 O 4 /rGO shows a high open circuit voltage of 1.54 V, a large power density of 194.6 mW cm −2 and good long-term cycling stability of nearly 400 h at 5 mA cm −2 , which affords a promising bifunctional oxygen catalyst for rechargeable ZABs.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2021
·
IF 2.495
Xiaoya Ji,Jinhai Yang,Ning Zhao,Feng Wang,Fukui Xiao
Zn/Zr mixed oxide catalysts with different Zn-Zr molar ratios were prepared by coprecipitation method, and their catalytic performance for synthesis of ethylene carbonate (EC) from ethylene glycol and urea were investigated. The catalysts were also characterized by XRD, FT-IR, XPS, Raman, SEM, HRTEM and CO 2 -TPD. Compared with ZnO, Zn/Zr mixed oxide has suitable basicity and low lattice oxygen binding energy. The catalyst with Zn/Zr ratio of 5:1 showed the highest catalytic activity in the reaction with the EC yield of 91%. The results revealed that the yield of EC was closely related to the amount of the basic sites on the catalyst surface. Based on the characterization results, a possible mechanism was proposed.
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