JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
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IF 4.464
Qing Wang,Zihan Zhang,Shaojie Shi,Fan Wu,Zhiguo Zhang,Guoneng Li,Yange Suo
In this work, highly active cobalt- and nitrogen-doped carbon (Co-N-C) materials were prepared for oxygen reduction reaction (ORR). The Co-N-C materials were synthesized through co-pyrolysis of ZIF-67 and melamine (ZIF-67@melamine). Detailed powder X-ray diffraction (XRD), fourier transform infrared (FTIR) spectroscopy and thermo-gravimentry (TG) analyses suggest melamine could accelerate the decomposition of the ZIF-67 framework. Compared with CoNC derived from pure ZIF-67, the CoNC- x C 3 H 6 N 6 materials derived from ZIF-67@melamine exhibit more carbon defects, larger BET specific surface area, higher content of pyridinic-N and graphitic-N, resulting in the enhanced activity of the CoNC- x C 3 H 6 N 6 samples. The onset potential of CoNC-0.5C 3 H 6 N 6 -700 catalyst towards ORR is 0.96 V (vs. RHE) and the half-wave potential is 0.87 V (vs. RHE), which are close to the state-of-the-art commercial Pt/C. Besides, the electrochemical stability of the CoNC-0.5C 3 H 6 N 6 -700 catalyst is much higher than that of commercial Pt/C.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Wenkai Pei,Junyang Zhang,Haijian Tong,Mengna Ding,Fengyan Shi,Ruizhe Wang,Yuning Huo,Hexing Li
The serious problem from pollution of metal ions placed great pressure to global water ecosystem and human beings. Herein, a synergistic photocatalytic-photothermal system of integrated membrane for the removal and reutilization of aqueous Ag + ions was designed. The crystal of zeolitic imidazolate frameworks-67 (ZIF-67) stably grew on the graphene oxide (GO) membrane with the uniform distribution. In the ZIF-67/GO membrane, the adsorption and photo-reduction of Ag + ions on ZIF-67 crystals led to the deposition of Ag nanoparticles on the membrane surface, which facilitated the capture of visible light, suppressed the recombination of the electron-hole pairs and promoted the photothermal effect. Meanwhile, the high efficiency of photothermal conversion on GO substrate realized the water evaporation to concentrate the Ag + solution and inhibited the separation of photo-induced charges. The synergistic photocatalytic-photothermal route on ZIF-67/GO membrane provides a new sight for the recycle of metal ions for the future practical applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Wei Peng,Xiaoxiao Yang,Linchang Mao,Junhong Jin,Shenglin Yang,Jingjing Zhang,Guang Li
Developing highly active and robust bifunctional non-precious oxygen electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is of paramount importance for enhancing the efficiency of zinc-air battery. Herein, Co nanoparticles anchored in N doped hollow and porous carbon nanofibers (CoN-HPCNF) are obtained via an in-situ growth-pyrolysis approach with the hybrid of ZIF-67 and carbon nanofibers as the precursor. Originating from its high surface area, firm and hierarchical porous structure, effective doping of N as well as synergistic effect from Co nanoparticles and HPCNF, the optimized CoN-HPCNF shows prominent bifunctional catalytic activity and long-term stability toward OER and ORR. Importantly, the assembled aqueous zinc-air battery with the prepared catalyst as the air cathode delivers a peak power density of 126.6 mW cm −2 and narrow charge-discharge voltage gap together with excellent operation durability (more than 280 h at the current density of 5 mA cm −2 ), outdoing the commercial precious metal catalysts (Pt/C + IrO 2 ).
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POWDER TECHNOLOGY
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2020
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IF 4.142
Summaira Saghir,Zhenggang Xiao
Metal-organic frameworks (MOFs) are traditional porous materials considered as efficient and low-cost for the removal of organic dyes from polluted water. In this study, we report a new type of hierarchical porous zeolitic imidazole frameworks −67@ layered double hydroxide (ZIF-67@LDH) consisting of nanocubes decorated with nanosheets . The prepared ZIF-67@LDH contains versatile functionalities which exhibit superior adsorption efficiency and adsorption rate for Methyl Orange (MO) and Alizarine Red S (ARS). The influence of pH, temperature, and contact time were analyzed in detail. The kinetics study revealed that the adsorption of MO and ARS over ZIF-67@LDH followed pseudo-second order (PSO) kinetic model , and adsorption isotherms were best described by the Langmuir isotherm model. Adsorption isotherms confirm the monolayer adsorption of MO and ARS over ZIF-67@LDH. The prepared material also shows outstanding recyclability with negligible loss. Thus ZIF-67@LDH presented a promising candidate for treating MO and ARS containing wastewater.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Ying-Hua Zhou,Xingyun Cao,Jingzhu Ning,Changchun Ji,Yong Cheng,Jing Gu
To exploit the low-cost and efficient catalyst for the hydrolytic dehydrogenation of ammonia borane , trace amount of palladium-doped transition metal (Cu, Ni, Co, Fe and Zn) nanoparticles have been incorporated into the interior of metal-organic frameworks named ZIF-8, ZIF-67, ZIF-67/ZIF-8 and core-shell ZIF-67@ZIF-8 by a double-solvent approach. The optimized catalyst of CuPd 0.01 @ZIF-67@ZIF-8 composite exhibited an excellent activity with a turnover frequency (TOF) value of 30.15 mol H 2 (mol metal ) −1 min −1 at 298 K and a relatively low activation energy of 38.78 kJ mol −1 . It might attributed to both ultrafine size of metal nanoparticles (~3 nm) induced by the confinement of core-shell ZIF-67@ZIF-8 and the synergistic effect between Pd and Cu. Moreover, the detailed kinetic study has manifested that this catalytic reaction is first-order in regards to the catalyst amount while zero-order as for the concentration of ammonia borane. In addition, the durability and recyclability of CuPd 0.01 @ZIF-67@ZIF-8 have been demonstrated to be great.
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Micro & Nano Letters
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2020
·Vol. 15
·期 7
·425-429
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IF 0.975
Yuqiong Shi,Beibei Qiu,Xiangrong Wu,Yuxuan Wang,Jinhua Zhu,Xiuhua Liu,Dongbao Zhao
To extend the wide application range of luteolin (LUT), a slow-release drug delivery system is urgently needed. In this work, Fe 3 O 4 @ZIF-67 was reported as the carrier of LUT. A facile synthesis method of Fe 3 O 4 @ZIF-67 was established with simply continuous stirring. The structure and function of the nanocomposites were characterised by SEM, TEM, XRD, FTIR, VEM and TGA. Under the optimal reaction conditions, the maximum drug loading capacity of the carrier was obtained to be 308.07 µg/mg. And LUT was released about 55% from Fe 3 O 4 @ZIF-67 after 72 h. The adsorption kinetics and release kinetics of LUT were also investigated. The results showed that the relationship between time and drug loading fitted well with the quasi-second-order kinetic equation ( R 2 = 0.99) and the release mechanism followed the Sigmoidal model ( R 2 = 0.98). In short, Fe 3 O 4 @ZIF-67 could be developed as a carrier of the LUT delivery system for slow release.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
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IF 3.218
Sumbal Farid,Weiwei Qiu,Jialin Zhao,Xuedan Song,Qing Mao,Suzhen Ren,Ce Hao
In recent years, a noticeable shifting from conventional fossil fuels to renewable energy based systems has embarked electrochemical splitting of water as the most promising way to produce clean energy of hydrogen. Generally, the lack of active and stable electrocatalysts for oxygen evolution reaction (OER) limits the practicability of water splitting as a renewable source of energy. In this work, interconnected 3D structure of cobalt oxides nanoparticles (Co 3 O 4 NPs) derived from ZIF-67 with nitrogen-doped carbon nanotubes (N-CNTs) of polypyrrole (PPy) origin is successfully synthesized as OER electrocatalysts. Impressively, the highly conductive N-CNTs that run through the Co 3 O 4 NPs not only endow the resulting product Co 3 O 4 /N-CNTs with large active surface area and enhanced charge transfer between Co 3 O 4 NPs, but also prevent Co 3 O 4 NPs from aggregation. As a result, the as-synthesized Co 3 O 4 /N-CNTs electrocatalyst exhibits outstanding OER activity with a low onset potential of ~1.37 V (vs RHE), overpotential of only 200 mV to attain a stable current density of 10 mA cm − 2 in basic media and very small Tafel slope of 40 mV dec − 1 . Moreover, the enhanced nitrogen-content also improves the OER kinetics by proficient charge transfer. The superb electrocatalytic performance and higher stability make the Co 3 O 4 /N-CNTs a proficient non-precious electrocatalyst for the OER.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
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IF 3.218
Shufang Cui,Yuanchun He,Xiangjie Bo
In this work, FeCo nanoparticles encapsulated in graphitic carbon layers are derived by direct pyrolysis of Prussian blue/ZIF-67. First, the Prussian blue nanocubes with size of 100–150 nm are selected as cores for growth of ZIF-67 metal organic frameworks . Subsequent direct pyrolysis of Prussian blue/ZIF-67 in nitrogen atmosphere enables the formation of carbon nanospheres with FeCo nanoparticles embedded into the nitrogen-doped graphitic carbon layers. The encapsulation of FeCo nanoparticles into the nitrogen-doped carbon layers favors the electron penetration from the underlying FeCo nanoparticles to the nitrogen-doped graphitic carbon layers, tuning the electron density and the electronic properties at the carbon overlayers and then promoting the both hydrogen and oxygen evolution reaction activity. By optimizing the ratio between the Prussian blue and ZIF-67, the active and inexpensive carbon layers-encapsulated FeCo nanoparticles achieve high activity towards the hydrogen evolution reaction, exhibiting a low overpotential of 106 mV at 10 mA cm −2 as well as a low Tafel slope of 90.0 mV dec −1 . As oxygen evolution reaction electrocatalysts , the carbon layers-encapsulated FeCo nanoparticles deliver an overpotential of 312 mV at 10 mA cm −2 and a low Tafel slope of 40.6 mV dec −1 . Severing as both anode and cathode, the carbon layers-encapsulated FeCo nanoparticles show a potential of 1.495 V at 10 mA cm −2 for water splitting, which is close to the noble metal benchmarks of Pt/C and RuO 2 counterparts. The carbon layers-encapsulated FeCo nanoparticles can be used as an attractive replacement for electrocatalytic water splitting.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
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IF 4.175
Shihang Guo,Pengcheng Zhang,Yi Feng,Zhongguo Wang,Xiaodan Li,Jianfeng Yao
Cellulose nanofibers (CNFs) are used to string ZIF-67 particles and interlaced Co 9 S 8 /porous carbon composite (Co 9 S 8 /C-CNFs) is obtained via carbonization and sulphidation of ZIF-67/CNFs composites. The CNFs can effectively limit the growth of ZIF-67 particles and avoid the agglomeration and most importantly, serve as the conductive skeleton to “bridge” carbonized ZIF-67 particles after carbonization. Due to the unique structure and the improved conductivity, Co 9 S 8 /C-CNFs as anode of lithium-ion batteries exhibits enhanced electrochemical properties and the specific capacity is 700 mAh g −1 at current density of 500 mA g −1 after 150 cycles compared to that of 342 mAh g −1 for samples without CNFs incorporation. Such nanoscale design may boost to explore other nanocomposites for energy storage.
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WATER RESEARCH
·
2024
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IF 11.4
Xing Zhang,Han Wu,Yue Wang,Yafei Wang,Yangyang Deng,Yanping Zhu,Shengsen Zhang,Huub Rijnaarts,Harry Bruning,Junhao Qin,Qingqi Lin,Zhuobiao Ni,Rongliang Qiu
The effectiveness of electrochemical reductive defluorination is impeded by the low environmental concentrations of per- and polyfluoroalkyl substances (PFASs) and the robust nature of C − F bonds. In this work, we investigate the zeolitic imidazolate framework-67 (ZIF-67) as a promising catalyst for PFASs remediation. We show that ZIF-67 hold promise for simultaneous adsorption and reductive defluorination of 2-(trifluoromethyl) acrylic acid (TFMAA). Following a 48-hour treatment, the ZIF-67 modification significantly improves the adsorption of TFMAA onto the cathode surface, achieving removal and defluorination efficiencies of 99.66 % and 97.16 %, respectively (C 0 = 5 mg L −1 , applied voltage of −1.2 V vs. Ag/AgCl). Furthermore, the atomic H*, catalyzed by the Co−N 4 structure, boosts the reductive defluorination of TFMAA through indirect mechanisms, while the nitrogen loss due to carbonization further enhances the catalytic defluorination efficiency. This research presents a novel electrode material for PFASs defluorination and offers mechanistic insights into the defluorination process.
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PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2024
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IF 1.5
Dai Wei,Dai Ying,Fang Chenglei,Xu Lin,Wang Yusheng,Zhou Haiyan,Zhong Xing,Li Zhuyao,Tao Qinqin
The development of environmentally friendly, operationally simple, and easily separable adsorbents for uranium removal from wastewater holds significant importance. The biopolymer gelatin (Gel) derived from animal collagen has poor water stability, limiting its application in wastewater treatment. By in-situ compositing with ZIF-67, a nitrogen-rich and stable metal–organic framework structure introduced onto the surface of gelatin fibers enhanced the uranium adsorption capacity of gelatin nanofibers and improved the water stability of these fibers. Furthermore, through the natural polyphenolic tannic acid tanning process, it is possible to further increase selectivity of gelatin composite fibers. The gelatin composite nanofibers Gel/ZIF-67 and T-Gel/ZIF-67 were characterized using SEM, FT-IR, XRD, XPS, and contact angle. Adsorption of uranium on both nanofibers were significantly influenced by pH but minimally affected by ionic strength, indicating the inner-sphere surface complexation. The adsorption of uranium onto Gel/ZIF-67 and T-Gel/ZIF-67 followed the Langmuir isotherm model, with theoretical adsorption capacities reaching up to 608.21 mg g −1 and 612.24 mg g −1 , respectively. Kinetic modeling analysis revealed that chemical adsorption played a dominant role during the adsorption processes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Shang Gao,Xinmeng Li,Chenyu Wang,Ruihua Yuan,Qin Zhang
Although metal-organic framework (MOF) derivatives are expected to exhibit advanced gas sensing properties, few amorphous MOF derivatives have been synthesized and used as gas sensors because common synthetic methods usually yield crystalline derivatives. In this work, an amorphous derivative of ZIF-67 consisting of nanocubes with an average size of about 200 nm was synthesized by calcining ZIF-67 at 260 ℃. The amorphous derivative started to transform into crystalline Co 3 O 4 at a calcination temperature of 270 ℃, during which the nanocubes collapse into nanoparticles . The amorphous derivative has a high specific surface area of 350.2 m 2 /g and a high mesopore ratio of 77.3 %. Remarkably, the amorphous derivative of ZIF-67 delivers a significantly enhanced response of 74.8–100 ppm triethylamine (TEA) gas at a low working temperature of 100℃ (30 % relative humidity), which is superior to that of ZIF-67 and its crystalline derivative. In addition, the amorphous derivative offers higher selectivity, greater long-term stability and good response under high relative humidity conditions. The response and recovery times are 125 s and 88 s. The improved gas sensing performance is mainly attributed to the high adsorbed oxygen content, large specific surface area and higher porosity of the material. The synthetic method detailed here could facilitate the development of gas sensors based on amorphous materials.
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