CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Wenyan Chen,Xingyun Li,Zhiwei Du,Zhiyuan Ma,Yifan Zuo,Qian Kong,Xianfen Wang
The energy density of aqueous reachable batteries (ARBs) is limited by the output voltage in the aqueous electrolyte. Herein, low-cost aqueous hybrid electrolytes composed of ZnSO 4 and K 2 SO 4 dual salts effectively improve the output voltage and suppress the zinc dendrites. The aqueous full cells assembled with potassium zinc hexacyanoferrate (KZnHCF) cathodes and zinc foil anodes reach an output voltage of 1.92 V and an energy density of 107.6 Wh kg −1 . It is demonstrated the reversible insertion/extraction of K + at the cathodes and uniform zinc deposition/striping at the anode in hybrid electrolyte via a series in-situ and ex-situ investigation. The dual salt electrolyte can not only satisfy the reversible capacitive dominated process at the cathodes but also suppress the zinc dendrite. Density functional theory (DFT) calculation demonstrates the K + preferential intercalation mechanism of KZnHCF in hybrid electrolyte and the inhibition effect of K + insertion on Zn 2+ insertion. This strategy presents a promising approach for development of high performance and low-cost aqueous electrolyte.
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APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Zhaofeng Zhai,Nan Huang,Hao Zhuang,Lusheng Liu,Bing Yang,Chun Wang,Zhigang Gai,Fengxiang Guo,Zhengjun Li,Xin Jiang
A platform for the determination of Zn(II), Cd(II), Pb(II) and Cu(II) has been proposed based on a novel diamond/graphite (D/G) nanoplatelets film electrode using differential pulse anodic stripping voltammetry method. The microstructure and the composition of the film were characterized by scanning electron microscope (SEM), atomic force microscope (AFM), Raman spectroscopy and transmission electron microscope (TEM). The D/G nanoplatelets structure with two-dimensional diamond nanoplatelet as the stem and highly conducting graphite layers as shells exhibits large specific surface and great electrical conductivity, significantly enhancing the electron transport in the electrochemical reaction. Under the optimum conditions, wide linear ranges and high sensitivity were achieved. In the typical detection process, two linear working ranges were obtained due to the incomplete anodic removal and the limits of detection (LODs) were estimated to be 1.72 μg L −1 , 0.47 μg L −1 , 4.86 μg L −1 and 0.45 μg L −1 for Zn(II), Cd(II), Pb(II) and Cu(II), respectively. The simultaneous detections also verify the superior analytical performance with linear ranges from 10 μg L −1 to 250 μg L −1 and low LODs. Herein, we present a novel diamond/graphite nanoplatelets electrode without any modification/functionalization for the sensitive detection of trace heavy metal ions .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
C.H. Yang,H.L. Pan,Y.K. Yang,H.T. Wu
A series of Zn-doped Li 2 (Mg 1-x Zn x ) 3 TiO 6 (x = 0, 0.05, 0.10, 0.15, 0.2) ceramics were formed via the conventional solid-state process. Influence of Zn 2+ on the crystal structures, phase compositions, sintering characteristics and properties of Li 2 (Mg 1-x Zn x ) 3 TiO 6 (0 ≤ x ≤ 0.2) ceramics were systematically studied. XRD results showed that a single phase with the cubic rock-salt structure was formed for Li 2 (Mg 1-x Zn x ) 3 TiO 6 (0 ≤ x ≤ 0.15) and the second phase of Zn 2 TiO 4 could be detected with a further increase of the Zn 2+ contents. Some intrinsic parameters were calculated in order to investigate the correlations between these parameters of Mg/Zn O bonds and microwave dielectric properties . As the Zn 2+ content increases, optimum ε r values exhibited an increasing trend, which could be explained by the variations of the polarizability and bond ionicity of Mg/Zn O bonds. The decrease of maximum Q·f values for Li 2 (Mg 1-x Zn x ) 3 TiO 6 (x = 0, 0.05, 0.10, 0.15, 0.2) ceramics could be predicted by the decrease of the packing fraction and lattice energy of Mg/Zn O bonds. τ ƒ values showed close relationship with the bond energy and thermal expansion coefficient of Mg/Zn O bonds. Excellent combined microwave dielectric properties with ε r = 15.46 (at 10.9 GHz), Q·f = 125,453 GHz (at 8.6 GHz) and τ f = −32.35 ppm/°C were obtained for Li 2 (Mg 0.85 Zn 0.15 ) 3 TiO 6 ceramic sintered at 1600 °C.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 2
·F18
·
IF 3.12
Lihong Qian,Dongling Jia,Yuqing Miao
The nanoporous microspheres of Co-Zn-S were synthesized by a solvothermal method. The as-obtained Co-Zn-S microspheres, as a non-noble metal catalyst, exhibited highly electrocatalytic activity for oxygen evolution reaction (OER) in alkaline electrolyte. It showed a low overpotential of only 320 mV to afford a current density of 10 mA cm−2 and a Tafel slope of 80.43 mV dec−1. Furthermore, the nanoporous microspheres of Co-Zn-S retained excellent electrocatalytic stability within a period of 36000 s. The catalyst also showed good catalytic performance toward the hydrolysis of ammonia borane to produce around 70 mL of H2 within the time of 30 minutes at room temperature. The nanoporous microspheres of Co-Zn-S exhibits the potential applications for hydrogen/oxygen production by water splitting or ammonia borane hydrolysis.
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MATERIALS RESEARCH BULLETIN
·
2022
·
IF 5.6
Yunjie Zhou,Jie Wu,Zhenzhen Wang,Hui Huang,Yang Liu,Zhenhui Kang
Biomass-derived catalysts represent one of the greener alternatives for green catalysis. Oxygen reduction electrocatalysts with high efficiency, low cost and large-scale production are the key to promote the commercialization of new energy technology, such as, metal-air battery. Herein, the cheap and available spirulina was used as the carbon source, and a metal-free and porous carbon catalyst (C111-900) was prepared using dual template and solid reaction strategy. The porous structure also regulates the dynamic process of interface charge transfer, which keeps the fast process part of the charge transfer consistent while accelerating the slow process. As a result, C111-900 performs exceptionally well in alkaline media, achieving close to 20% Pt/C, including the half-wave potential, limiting current density and catalytic selectivity. Additionally, it exhibits higher power density (138.5 mW cm −2 ), specific capacity (766.4 mAh g Zn −1 ), energy density (958 Wh kg Zn −1 ) and has greater stability under high current discharge conditions than 20% Pt/C in Zn-Air batteries
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JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Quan Chen,Lunan Wu,Xiaoli Zhao,Xiu-Jie Yang
Zn-Ti layered double oxide (LDO) nanosheets were synthesized by a simple co-precipitation-calcination process for the enhanced photocatalytic degradation of methyl orange (MO), rhodamine B (RhB) and methylene blue (MB). ZnTi-LDOs nanosheets present higher photocatalytic efficiency for MO, RhB and MB removal, which is 5.4, 4.4 and 6.7 times of that of Zn-Ti layered double hydroxide (LDH), respectively. The photocatalytic activity of synthesized ZnTi-LDOs is greatly affected by the mole ratio of Zn/Ti, calcination temperature and pH value. It is found that the formation of ZnO/ZnTiO 3 heterojunction in ZnTi-LDOs could effectively accelerate the rapid separation of charge carriers, and thus enhance the photocatalytic activity via enlarging the photoresponse range. The possible charge transfer mechanism for photocatalytic degradation of organic dyes by ZnTi-LDOs was proposed based on the active species test and UV–Vis diffuse reflectance spectra. The results of active species trapping experiments showed that ‧OH, ‧O 2 − , h + , e − all had effect on the degradation of RhB , and ‧OH played a major role. This study provides a new insight for the photocatalytic degradation of organic pollutants from wastewater by ZnTi-LDOs.
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Sustainable Energy & Fuels
·
2022
·Vol. 6
·期 14
·3383-3393
·
IF 6.813
Jiawei Wei,Ping Li,Jing Shi,Minghua Huang,Weiqian Tian,Huanlei Wang
Designing high-performance carbon-based oxygen reduction catalysts using a facile strategy is an attractive research direction in the field of energy conversion and storage. Herein, N/S co-doped carbon was prepared using κ-carrageenan and melamine as precursors, in which melamine can be decomposed into nitrogen-containing gas for realizing nitrogen doping, and the sulfate groups in κ-carrageenan can be converted for sulfur doping. Such an N/S doping strategy enables a carbon catalyst with a large specific surface area, hierarchical porous structure, and rich defective sites to be achieved, displaying a high positive onset potential (Eonset = 0.98 V) and half wave potential (E1/2 = 0.89 V), excellent stability, and methanol tolerance. More importantly, S doping could increase the positive charge density of the carbon adjacent to the nitrogen, which is favorable for enhancing the chemisorption of O2 and weakening the O–O bond, thereby promoting the reaction from O2 to OH− and improving electron transfer. Furthermore, with this catalyst as the air cathode, the assembled aqueous Zn–air battery exhibits a high open-circuit potential of 1.53 V and a remarkable peak power density of 166.05 mW cm−2, outperforming the Pt/C catalyst. This work gives a facile and effective strategy to construct high-performance ORR catalysts with four electron transfer for Zn–air batteries.
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DALTON TRANSACTIONS
·
2019
·Vol. 49
·期 2
·312-321
·
IF 4.052
Yuanfeng Wu,Xianghai Song,Siquan Xu,Yuan Chen,Olayinka Oderinde,Lijing Gao,Ruiping Wei,Guomin Xiao
Bimetal mixed MOFs of [CoZn][(BDC)(DABCO)0.5] (CZ-BDO), [CoNi][(BDC)(DABCO)0.5] (CN-BDO), and [NiZn][(BDC)(DABCO)0.5] (NZ-BDO) were prepared under solvothermal conditions and further employed as highly active accelerants for converting carbon dioxide into cyclic carbonates. The characteristics of the bimetal compounds were revealed via various techniques, including ICP-OES, XRD, FT-IR, Raman, XPS, SEM, EDS maps, N2 adsorption, TG-DTG, and CO2/NH3-TPD. The catalytic results revealed that CZ-BDO is superior to the other samples for obtaining a satisfactory chloropropene carbonate (CPC) yield. The excellent catalytic activity may be owing to the presence of a solid solution within the Co and Zn bimetal sample, which provides synergistic catalysis in the carbon dioxide cycloaddition. In addition, the synergistic catalysis was further confirmed by the NH3-TPD profiles, whereby the amount of CZ-BDO basic sites was obviously enhanced compared to the other samples. Furthermore, DFT calculations were also performed to reveal the synergistic catalysis between Co and Zn for the coupling reaction. Additionally, when the coupling reaction was carried out at 100 °C for 5 h in the presence of 0.5 wt% epichlorohydrin (ECH) as a catalyst at 3.0 MPa, 99.31% conversion of ECH and 97.05% yield of CPC were obtained over the optimal CZ-BDO sample. Moreover, the bimetal sample can also efficiently convert other epoxides into the corresponding cyclic carbonates.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Junhao Liu,Jinshi Yu,Xiaoyan Wang,Meng Cheng,Shuangqing Sun,Songqing Hu,Chunling Li,Zhikun Wang
Metal–nitrogen–carbon (M–N–C) catalysts obtained from zeolitic imidazolate frameworks (ZIFs) have great potential in the oxygen reduction reaction (ORR). Herein, based on the same three-dimensional (3D) topological structure of ZIF-67 and ZIF-8, ZIF-67 is grown on the ZIF-8 surface by the epitaxial growth method, and ZIF-8 is used as a sacrificial template to obtain a Co-embedded layered porous carbon nanocage (CoPCN) electrocatalyst. Meanwhile, the self-sacrificing template effectively improves the specific surface area of the porous structure and reduces the depletion of active sites. The CoPCN shows a high half-wave potential of 0.885 V and superior stability as well as excellent methanol resistance. Theoretical calculations demonstrate that the Co–N1–C2 sites of CoPCN effectively reduce the energy barrier of ORR. In addition, a zinc–air battery (ZAB) based on the CoPCN exhibits excellent peak power density (90 mW cm–2) and superior cycle performance. This work presents a novel idea in the design of ZIF precursor systems to synthesize efficient ORR catalysts.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Qiaoqi Li,Lili Zhang,Chao Tang,Pusu Zhao,Chengzhu Yin,Jingzhou Yin
The systematic investigation of In 3+ ions doped ZnGa 2 O 4 applying to photocatalytic H 2 evolution (PHE) under simulated solar-light irradiation was first reported here. A series of Zn(In x Ga 1- x ) 2 O 4 ( x = 0 to 0.4) solid-solutions were obtained by sol-gel method and characterized by XRD , SEM, elemental mapping, XPS , UV–Vis DRS and N 2 adsorption measures. The concentration of In 3+ ions remarkably enhanced the light-harvesting capability of Zn(In x Ga 1- x ) 2 O 4 solid-solutions in the visible-light region, and successfully regulated the positions of the CB-bottom potential, ultimately improving the photocatalytic capabilities under simulated solar-light irradiation. Among composites containing different In 3+ ions dosages, Zn(In 0.1 Ga 0.9 ) 2 O 4 demonstrated the most excellent photocatalytic capability for solar-light-driven PHE reaction (H 2 : 240.6 μ mol/h/g), in which the stability of the Zn(In 0.1 Ga 0.9 ) 2 O 4 was confirmed by several techniques.
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Small Methods
·
2023
·Vol. 7
·期 11
·2300714
·
IF 12.4
YaFei Zhang,Chunliu Zhu,Yan Xiong,Zongying Gao,Wei Hu,Jing Shi,Jingwei Chen,Weiqian Tian,Jingyi Wu,Minghua Huang,Huanlei Wang
Porous carbon is the most promising cathode material for Zn-ion hybrid capacitors (ZIHCs), but is limited by insufficient active adsorption sites and slow ion diffusion kinetics during charge storage. Herein, a pore construction-pore expansion strategy for synthesizing multi-channel hollow carbon nanofibers (MCHCNF) is proposed, in which the sacrificial template-induced multi-channel structure eliminates the diffusion barrier for enhancing ion diffusion kinetics, and the generated ultrahigh surface area and high-density defective structures effectively increase the quantity of active sites for charge storage. Additionally, a graphene-like shell structure formed on the carbon nanofiber surface facilitates fast electron transport, and the highly matchable pore size of MCHCNF with electrolyte-ions favors the accommodation of charge carriers. These advantages lead to the optimized ZIHCs exhibit high capacity (191.4 mAh g −1 ), high energy (133.1 Wh kg −1 ), along with outstanding cycling stability (93.0% capacity retention over 15000 cycles). Systematic ex situ characterizations reveal that the dual-adsorption of anions and cations synergistically ensures the outstanding electrochemical performance, highlighting the importance of the highly-developed porous structure of MCHCNF. This work not only provides a promising strategy for improving the capacitive capability of porous materials but also sheds light on charge storage mechanisms and rational design for advanced energy storage devices.
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Fuel Cells
·
2017
·Vol. 17
·期 5
·723-729
·
IF 1.706
Y. Yi,J. Huo,W. Wang
Molecular simulation method was firstly used for analyzing the energy of aluminum alloy systems alloyed by Mg, Ga, Zn and Mn. Based on the analyses, Al-Mg, Al-Ga, Al-Zn, Al-Mn alloys were metallurgically prepared. The structures, electrochemical activities and utilization ratios were characterized by X-ray diffraction patterns (XRD), anodic polarization measurement and galvanostatic discharge. The calculated energies of the aluminum alloy systems increase in the following order: Al< Al-Mn < Al-Mg < Al-Zn < Al-Ga. The absolute values of the open circuit potentials of the alloys measured in alkaline solution rank in the following orders: φ Al-Ga alloy > φ Al-Zn alloy > φ Al-Mg alloy > φ Al-Mn alloy and the order is consistent with the calculated energies. The results indicate that molecular simulation based on the first-principles is a useful method in the alloying design and thermodynamic performance prediction. Alloy additives Zn and Ga effectively change the open circuit potential of metal aluminum to a more negative potential. In addition, alloy additive Zn increases the charge transfer resistance of Al→Al 3+ , which decreases the discharge current density. Alloy additive Mg diminishes the grain size of the alloy and notably enhances the discharge current density. Alloy additive Mn improves the utilization ratio remarkably when discharging in alkaline solution.
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