CARBON
·
2019
·
IF 7.466
Weiguang Fang,Haibo Hu,Tongtong Jiang,Guang Li,Mingzai Wu
A novel 3D composites comprising in-situ formed Co Ni bimetallic sulfides particles (Co Ni S@NSPC) embedded in N, S-doped porous carbon was facilely constructed for the air cathode catalyst for Zn-air batteries. The synergistic interplay between N, S doped carbon matrix, the porous structure and the highly catalytic active cobalt nickel sulfides species contributes greatly to the excellent bifunctional catalytic activity both in the ORR and OER in 0.1 M KOH solution for the Co Ni S@NSPC catalyst. The ORR measurement results showed that the half-wave potential (0.82 V vs. RHE), current density (5.23 mA cm −2 at 0.2 V vs. RHE) of our sample were very close to that of Pt/C (0.82 V, 5.17 mA cm −2 ), meanwhile its stability and methanol tolerance were superior to Pt/C. The OER measurement results showed that the Co Ni S@NSPC catalyst exhibited a small overpotential (0.47 V vs. RHE) at 10 mA cm −2 , close to that of RuO 2 (0.39 V). Importantly, compared to the mixture of Pt/C and RuO 2 cathodes, the rechargeable Zn-air battery based on Co Ni S@NSPC cathode exhibits smaller discharge/charge overpotential (0.85 V), higher power density (51.6 mW cm −2 ), higher voltaic efficiency (58.5%) at 10 mA cm −2 and an improved cycling stability over 3600 min.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Jidong Zhang,Mengyao She,Jie Li,Cuiling Wang,Shen Wang,Ping Liu,Shengyong Zhang,Jianli Li
A series of naphthalene carbohydrazone based fluorescent chemosensors L 1 -L 4 were developed for the detection of Zn 2+ by significant fluorescence enhancement. The binding ratio of the L 1 -Zn 2+ complex was determined by a Job’s plot to be 1:1 and confirmed by ESI–MS studies. The corresponding of the L 1 -Zn 2+ ensemble was elucidated through X-ray crystallography along with spectroscopic studies. Furthermore, the L X -Zn 2+ (X = 1–2) complexes can specifically detect pyrophosphate (PP i ) in HEPES buffer solution through fluorescence quenching. The detection limit of L X -Zn 2+ (X = 1–2) for PP i sensing were calculated to be as low as 2.54 ppb and 0.94 ppb, respectively. In addition, due to their good cell membrane permeability and low cytotoxicity, L 1 -L 4 have been applied to sequentially detect Zn 2+ and PP i in living cells. More importantly, the electronic effect of substitute groups on fluorescence signaling have been studied by substituent properties ranging from electron-donating to electron-withdrawing, which sets up a promising strategy for the rational design of fluorescent sensors.
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ACS Applied Nano Materials
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2018
·
IF 0
Jiuhai Wang,Yadi Fan,Hang-wei Lee,Changqing Yi,Changming Cheng,Xin Zhao,Mo Yang
Here, a novel colorimetric sensing platform for highly selective detection of Fe3+ in aqueous solutions was developed based on zero-dimensional Zn-MOF-74 [Zn2(DOBDC), DOBDC = 2,5-dihydroxyterephthalic acid] nanodots. The first ultrasmall Zn-MOF-74 nanodots with the average size within 10 nm were successfully synthesized by manipulating the initial conditions with a diluted material system. It was found that the ultrasamll MOF nanodots had a highly selective interaction with Fe3+ and showed a specific blue colorimetric change in aqueous solution. The highly dispersive nature in aqueous solution and high surface-to-volume ratio help MOF-74 nanodots closely interact with the targeted Fe3+ ions with a low limit of detection of 1.04 μM and a fast response within seconds. Finally, we demonstrate that the selective Fe3+ sensing mechanism of Zn-MOF-74 nanodots is due to the selective framework disruption and the formation of Fe-DOBDC salt complex with blue color. It is the first report of nanoscale MOF based colorimetric Fe3+ sensor with low limit of detection (LOD) comparable even to fluorescent MOF based Fe3+ sensors, which could be easily observed by naked-eye without expensive fluorescence apparatuses. The good colorimetric stability in aqueous environment, low limit of detection, rapid response, and nanosize nature enable this MOF nanodot to be a good Fe3+ sensing probe for biological and environmental sensing applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2018
·
IF 11.698
He Xiao,Wenyao Zhang,Qiushi Yao,Liulian Huang,Lihui Chen,Bruno Boury,Zhongwei Chen
Metal organic frameworks (MOFs) are exploited in many applications of materials science and very recently were investigated as precursors or reagents for material synthesis. In a new way different from previous approaches, here we introduce for the first time the synthesis of metal oxide M x O y in the presence of M-free MOF acting partially as a sacrificial template and as a provider of doping metal atom. We demonstrate this approach in the case of ZnO prepared by a simple hydrothermal method in the presence of a Zn-free MOF like MIL-53(Al) or MIL-125(Ti). The resulting ZnO show low content of Al or Ti < 2% and properties are significantly different depending on whether MIL-53(Al) or MIL-125(Ti) are used or if no MOF is present. The nature and presence of MOF has different major effects on the morphology, the specific surface area of as prepared ZnO and also on the oxygen defects in its crystal structure. Corroborating the XPS, UV–vis DRS, PL, EPR and DFT studies evidence the role of such O-defects on band gap narrowing for samples calcined at 400 °C. These exhibit high efficiency in photodegradation of methyl orange (MO) compared to ZnO prepared in MOF-free conditions or previous literatures. The kinetics of MO degradation is different depending on the morphology, the specific surface and oxygen defects. The present data open the door to a new approach of the synthesis of metal oxides and a control of their properties.
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ANALYTICA CHIMICA ACTA
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2014
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IF 4.517
Xiaoyu Mu,Li Qi,Juan Qiao,Xinzheng Yang,Huimin Ma
A chiral ligand exchange capillary electrophoresis (CLE-CE) method using Zn(II) as the central ion and l -4-hydroxyproline as the chiral ligand coordinating with γ-cyclodextrin (γ-CD) was developed for the enantioseparation of amino acids (AAs) and dipeptides. The effects of various separation parameters, including the pH of the running buffer, the ratio of Zn(II) to l -4-hydroxyproline, the concentration of complexes and cyclodextrins (CDs) were systematically investigated. After optimization, it has been found that eight pairs of labeled AAs and six pairs of labeled dipeptides could be baseline-separated with a running electrolyte of 100.0 mM boric acid, 5.0 mM ammonium acetate, 3.0 mM Zn(II), 6.0 mM l -hydroxyproline and 4.0 mM γ-CD at pH 8.2. The quantitation of AAs and dipeptides was conducted and good linearity ( r 2 ≥ 0.997) and favorable repeatability (RSD ≤ 3.6%) were obtained. Furthermore, the proposed method was applied in determining the enantiomeric purity of AAs and dipeptides. Meanwhile, the possible enantiorecognition mechanism based on the synergistic effect of chiral metal complexes and γ-CD was explored and discussed briefly.
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PubMed
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 45
·23641-23650
·
IF 8.867
Zhong-Jie Jiang,Si Cheng,Haibo Rong,Zhongqing Jiang,Jianlin Huang
A general method has been developed for the synthesis of the spindle-like MFe2O4/C (M = Zn, Co, Ni, Mn). The synthetic procedure involves the preparation of mixed metal organic frameworks (i.e. Fe2M-MOFs) and their subsequent calcination. The obtained MFe2O4/C spindles show an intriguing structure, which consists of carbon coated secondary MFe2O4 nanoparticles with an interconnected carbon network. This makes them highly promising as the active materials for various applications with enhanced performance. For example, when used as the anode for lithium ion batteries (LIBs), the MFe2O4/C spindles exhibit higher reversible capacities and higher cycling stability in comparison to the MFe2O4 materials reported previously. Most interestingly, these MFe2O4/C spindles exhibit good morphology preservation during cycling. This shows that the volumetric expansion of MFe2O4 upon lithiation leads to the leaching of some active materials to the surface of the MFe2O4/C spindles along the percolation channels. This alleviates the volumetric expansion energy and prevents the structural destruction of MFe2O4/C spindles. The leached active materials do not detach from the MFe2O4/C spindles and participate in the lithiation/delithiation reactions throughout the whole cycling process, giving the MFe2O4/C spindles with high specific capacity and good durability. The approach reported here is highly versatile and might be applicable to the synthesis of other MFe2O4/C spindles for various applications.
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Catalysts
·
2024
·Vol. 14
·期 3
·205
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IF 3.8
Pengfei Sha,Xiao Yong,Di Chen,Xing Chen,Fengying Yan,Beili Pang,Hongzhou Dong,Jianhua Yu,Liyan Yu,Lifeng Dong
A Zn–air battery serves as an energy storage solution to address fossil energy and environmental concerns. However, sluggish kinetics in oxygen reduction reactions (ORRs) and oxygen evolution reactions (OERs) demand innovative, cost-effective, and stable bifunctional catalysts to replace precious metal catalysts. In this study, an FeCo-CNTs/KB catalyst was synthesized by pyrolyzing NH2-MIL-101(Fe) coated with glu-Co and conductive carbon (KB). This hierarchical structure comprises carbon nanotubes (CNTs) grafted onto a carbon matrix, housing abundant FeCo nanoparticles within the nanotubes or matrix. KB introduction enhances FeCo nanoparticle dispersion and fosters uniform CNT formation with smaller diameters, thus exposing active sites. Consequently, the FeCo-CNTs/KB catalyst exhibits remarkable bifunctional electrocatalytic activity: an ORR half-wave potential of 0.84 V and an OER overpotential of 0.45 V (10 mA cm−2). Furthermore, the FeCo-CNTs/KB catalyst in a secondary Zn–air battery showcases enduring charge–discharge performance (≥300 h).
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Penghua Zhao,Lei Zhang,Jiachuan Chen,Chenglong Qiu,Baobin Wang,Jinze Li,Kai Zhang,Guihua Yang
High-efficiency and low-cost electrocatalysts for oxygen reduction reaction (ORR), as well as gel electrolytes with high water retention, mechanical adaptability and zinc dendrites inhibition are required for flexible Zn-air batteries. Herein, abundant cellulose extracted from wood was employed to prepare ORR catalysts consisting of single iron atoms and Fe 3 O 4 nanoparticles embedded within nitrogen-doped carbon nanosheets (SA-FeCNS). The optimized SA-FeCNS-800 demonstrated remarkable ORR catalytic activity, showcasing a half-wave potential of 0.85 V vs. RHE and a diffusion-limiting current of 5.54 mA cm −2 at 0.3 V vs. RHE. Its efficacy was further demonstrated in Zn-air battery technology, where it exhibited superior discharging and charging capabilities, allowing for 618 h of continuous operation at 5 mA cm −2 , along with enduring performance at high current densities (10 mA cm −2 and 20 % depth of discharge). Furthermore, a solid-state electrolyte named SLS@PVA-SSE was fabricated utilizing wood’s sodium lignosulfonate-functionalized polyvinyl alcohol hydrogel. This innovation effectively curbed the formation of zinc dendrites and enhanced alkaline resistance, owing to the incorporation of positively charged sulfonate groups. The flexible Zn-air batteries assembled with SA-FeCNS-800 and SLS@PVA-SSE exhibit long cycling life of for 85 h at 2 mA cm −2 and 37 h at 5 mA cm −2 . This study offers a sustainable and effective way to make high-performance catalysts and solid electrolytes for advanced flexible energy materials using renewable biomass.
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-11
·
IF 3.9
Jin Hong,Lin Dejian,Zhou Laihong,Zha Guojun,Wu Huanwen,Li Shuigen,Jiang Minhua,Huang Ping,Xie Haijiao
Electrocatalytic materials with dual functions of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) have received increasing attention in the field of zinc-air batteries (ZABs) research. In this study, bifunctional CoNC@NCXS catalysts were prepared by anchoring Co and N co-doped CoNC on N-doped carbon xerogel sphere (NCXS) based on the spatially confined domain effect and in-situ doping technique. CoNC@NCXS exhibited excellent ORR/OER activity in alkaline electrolytes with the ORR onset potential of 0.99 V, the half-wave potential (E 1/2 ) of 0.78 V at 10 mA cm −2 and the OER overpotential of 360 mV at 10 mA cm −2 . These excellent catalytic activities were derived from constructing composite active structures and enhancing electrocatalytic efficiency. The ZAB assembled with CoNC@NCXS catalyst had a discharge specific capacity of 710 mAh g −1 at a current density of 10 mA cm −2 , which was superior to that of the Pt/C&RuO 2 catalyst-assembled battery (667 mAh g −1 ). After running for 150 h, the charge and discharge efficiency of the CoNC@NCXS battery decreased by only 12.8%, which confirmed the excellent stability of the CoNC@NCXS catalyst. The free energy diagrams showed that, CoNC@NCXS has lower energy barriers and higher potential than CoNC in key reaction steps. This study provides a new perspective for the structural design of highly active composite catalysts in energy storage and conversion.
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PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Peng Song,Yue Zhang,Ningmiao Zhao,Linzhi Zhai,Shuping Ba,Xinyu Wang,Congcong Li,Zhenyuan Ji,Qi Liu
Herein, by using ZIF-8, a metal–organic frameworks (MOFs) material, as nitrogen and carbon sources, KOH as activator and LiCl/KCl as medium, a new variety of N-doped porous carbon nanosheets is developed via an affordable molten salt assisted pyrolysis route. Results verify that, with KOH activation, pore volume and specific surface area of the flake-like specimen are obviously enriched, which contribute to a hierarchically porous structure. Specifically, ZNPCN-0.2–750 with total pore volume of 1.0 cm 3 g −1 , specific surface area of 787.6 m 2 g −1 and high N-doping content of 21.2 at% exhibits a decent capacitive property as cathode for Zn-ion hybrid supercapacitors (ZHSs), such as energy density of 83.2 Wh kg −1 at 399.9 W kg −1 , specific capacitance of 233.9F/g at 0.5 A g −1 and cyclic stability with capacitance retention of 87.7 % after 20,000 cycles. These performance parameters exceed numerous ZHSs reported so far, guaranteeing a huge potential in practical application.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Di Wu,Yilin Wang,Zhifang Liu,Caiyu Ge,Jiejun Li,Xinyi Li,Yixi Xie,Pengcheng Zhao,Junjie Fei
Rifampicin (RFP) is an emerging environmental pollutant that exists in natural waters due to discharged from the medical and pharmaceutical industries, posing potential risks to aquatic life and human health. Developing highly sensitive detection techniques for RFP is essential for environmental monitoring and public health protection. In this work, Mn 2 O@Zn-NC was synthesized using in-situ growth and pyrolysis methods. Rod-like MnO 2 providing dispersed sites for the growth and crystallization of dodecahedral ZIF-8,with dodecahedral ZIF-8 tightly encapsulates MnO 2 . Additionally, the Zn-NC formed after high-temperature treatment effectively addresses the issue of poor conductivity in MnO 2 , which is conducive to the accurate display of RFP current signals. Using material of Mn 2 O@Zn-NC, a high-sensitivity electrochemical sensor was developed with a detection range of 0.040–100 µM and a limit of detection of 25 nM. This highly sensitive sensor can accurately detect RFP in environmental samples, with results comparable to those obtained using UV-Vis spectroscopy. This breakthrough electrochemical detector provides valuable opportunities for creating smart, efficient, and portable monitoring solutions.
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NEW CARBON MATERIALS
·
2024
·
IF 6.5
Xiao-li Yan,Kui Wang,Shu-wei Hao,Guang-da Zhou,Hao-wei Yang,Hua Zhang,Jun-jie Guo
Exploring cost-efficient and highly-efficient noble metal-free catalysts for the oxygen reduction reactions (ORRs) involved in sustainable energy devices remains a great challenge. Transition-metal phosphides supported on heteroatom-doped carbons have shown potential as alternative candidates for precious metals because of their tunable electronic structures and higher catalytic performance. Phosphating was used to construct CoP nanoparticles (NPs) anchored on a nitrogen-doped porous carbon framework (CoP@NC) from Co NPs loaded on NC, using PH 3 gas released from NaH 2 PO 2 during heat treatment. The dodecahedral structure of Co NPs was retained in their transformation to CoP NPs. The CoP@NC electrocatalyst shows a remarkable ORR activity with a half-wave potential up to 0.92 V under alkaline conditions, which is attributed to the combined coupling between the well dispersed CoP nanoparticles on the nitrogen-doped carbon and the efficient mass transport in the porous structure. Zinc-air batteries assembled with the CoP@NC electrocatalyst as a cathode have a high open-circuit voltage of 1.51 V and power density of 210.1 mW cm −2 . This work provides a novel strategy to develop low-cost catalysts with an excellent ORR performance to promote their practical use in metal-air batteries
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危险品化学品经营许可证（带存储）