Nano Research
·
2023
·Vol. 16
·期 7
·8827-8835
·
IF 9.9
Wang Xin,Miao Ming,Tang Bowen,Duan Haotian,Zhu Fulong,Zhang Huigang,Zhang Xian,Yin Wen-jin,Fu Yongzhu
Electrochemical conversion of CO 2 (CO 2 RR) into high-value fuel is identified as one of the promising approaches to achieve carbon neutrality. The synthesis of high-efficiency CO 2 reduction electrocatalysts with high C 2 :C 1 , selectivity remains a field of intense interest. Previous studies have shown that the presence of Cu(I) is beneficial for the reduction of CO 2 into C 2 products. However, the stable presence of Cu(I) remains controversial, especially in the negative potential window. Here we report a simple and easily scalable catalyst precursor Cu 2 (OH) 3 Cl/C, which automatically forms in-situ chlorine-doped Cu/Cu 2 O heterointerface during electrocatalysis. The catalyst not only exhibits a Faradaic efficiency of 33.03% but also provides a long-term stability of Cu + , gaining a stable electrolysis of 11 h, with an ethylene/methane ratio over 50. The experimental results and mechanistic studies confirm that the presence of Cl − inhibits the reduction of Cu + , inducing the formation of Cu 0 /Cu + , and reduces the reaction energy of the intermediate ⋆CO dimerization, thereby facilitating the formation of C 2 products. This work provides a feasible way to synthesize copper ions with long-term and stable positive charge in CO 2 RR and expands a new way to synthesize ethylene industrial products in the future.
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高影响因子
JOURNAL OF POWER SOURCES
·
2023
·
IF 9.2
Yabiao Pei,Weikang Zhu,Runfei Yue,Jie Yao,Xin Liu,Lianqin Wang,Junfeng Zhang,Yan Yin,Michael D. Guiver
Adjusting catalyst/ionomer agglomerate is crucial to a high-performance catalyst layer (CL), particularly for non-precious metal catalysts . As a sacrificial component, the solvent plays a vital role during the CL formation process and resulting microstructure, determining the performance of the anion exchange membrane fuel cells (AEMFCs). Here, solvent mixtures of isopropanol (IPA) and tetrahydrofuran (THF) are studied for the controllable construction of the Co/Fe–N–C CL. The results indicate that the aggregate state of the ionomers and catalysts and the final CL microstructure strongly depend on the ratio of IPA and THF. The CL prepared with IPA: THF = 1:2 (v/v) shows a homogeneous distribution of Co/Fe–N–C catalysts, embedded in the ionomer matrix, due to the fast volatilization and low viscosity of the catalyst ink. The Co/Fe–N–C CL with high moisture adsorption behavior and retention ability results in a high performance AEMFC with peak power density of 545.3 mW cm −2 at 80 °C. The obtained results can guide the rational design of microstructure in non-precious metal CLs for high-performance AEMFCs.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Fang He,Hubo Yuan,Huayan You,Zhenxing Wang,Shaoqin Peng,Yuexiang Li
Building carbon nitride (CN)-based core shell heterostructures is an effective strategy to enhance the photocatalytic performance and stability by optimize the interface area and protect the CN core, respectively. Moreover, by fabricating the porous structures in core shells can further optimize the light absorption, charge separation, and mass transfer. Herein, we have constructed porous C-PDA–CN–ms core-shell heterostructures through a facile green molten salt (ms) sculpture the polydopamine (PDA) derived carbon (C-PDA) shells with CN core. In which, the C-PDA-CN core-shells arise from in situ polymerization of dopamine (DA) on the surface of melamine to form PDA@melamine coatings followed by thermal polycondensation . The molten salts at high-temperature act as a green fluid immersing in and out of C-PDA-CN core-shells to further produce porous structures. The 1 wt% C-PDA–CN–ms with porous core-shell structures display photocatalytic H 2 evolution rate of 3830 μmol h −1 g −1 , which is 20.8 times enhancement of 1 wt% C-PDA-CN core-shells, even 73.6 times higher than that of pristine CN. It reveals that the porous and core-shell heterostructures endow C-PDA–CN–ms enhanced light absorption, various charge transport channels for improved charge carrier separation and transfer, contributing to the superior photocatalytic H 2 evolution performance. Our work opens a new window for the green construction of porous core-shell heterostructures of CN-based photocatalysts .
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高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Huaide Chen,Guojun Xu,Chenxin Jin,Jize Wu,Linwu Xiong,Xiaomin Li,Fugen Sun,Lang Zhou,Zhihao Yue
Silicon monoxide (SiO x , 0 < x < 2) has been limited in commercial applications due to its low electrical conductivity and large volume expansion effect. The existing method is to use liquid phase method for carbon coating treatment, but some problems such as uneven coating are still exist. Therefore, in this paper, C 2 H 2 is used as carbon source to coat SiO x material in a rotating chemical vapor deposition furnace to obtain hard carbon coated SiO x (SiO x @C) material. At the rate of 0.5C (1C = 2.1 A g −1 ), the discharge specific capacity of SiO x @C remained at 1116.8 mAh g −1 after 140 cycles, which is 539.8 mAh g −1 higher than SiO x .
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高影响因子
RARE METALS
·
2023
·Vol. 42
·期 8
·2592-2600
·
IF 8.8
Chen Jing,Chen Xuan-Le,Lu Rou,Li Yong,Pan An-Qiang
Molybdenum dioxide has aroused a wide concern as anode material for lithium-ion batteries (LIBs) due to its high theoretical capacity and high density. However, it still faces the problems of large volume changes and low electronic conductivities, which limits its practical application. Herein, necklace-like N-doped carbon nanofibers encapsulating MoO 2 nanospheres (MoO 2 @NCNFs) with Mo–C bonding have been designed to address these issues. The rational design carbon coating structure can not only enhance the electron transfer, but also markedly strengthen structural stability. As expected, the as-prepared electrode showed superior lithium storage capacity, including a high specific capacity of 1120 mAh·g −1 at 0.1 A·g −1 , and good rate performance of 502 mAh·g −1 at 4.0 A·g −1 and a prolonged cycling stability of 490 mAh·g −1 capacity retention over 3000 cycles at 4.0 A·g −1 . Graphical abstract
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 7
·4484-4494
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IF 2.1
Zhang Chenyu,Tang Jiancheng,Ye Nan,Chen Jing
The construction of anode materials for alkali-ion batteries with high capacity and a long life span is significant and remains challenging. With the increasing interest in vanadium sulfide, V 3 S 4 possesses unique a structure and shows great promise for application in alkali-ion batteries, such as lithium-ion batteries (LIBs), sodium-ion batteries (SIBs), and potassium-ion batteries (PIBs). However, it still faces the problems of large volume changes and low electronic conductivities, which limits its practical application. Herein, ultrafine V 3 S 4 nanocrystals evenly integrated within three-dimensional (3D) porous N-doped carbon (N–C) by V–C bond are rational designed to address these issues. The interconnected N–C coating provides bi-continuous electron/ion transport pathways. Also, the 3D porous structure ensures a large surface area, as well as robust structural integrity, boosting reaction kinetics. Moreover, the strengthened interface coupling not only enhances the electron transfer at the interface, but also markedly strengthens structural stability. As expected, the as-prepared electrode showed superior lithium storage capacity, including a high specific capacity of 1021 mA h g −1 at 0.1 A g −1 , superior rate performance of 698 mA h g −1 at 2.0 A g −1 and excellent cycling stability and prolonged cycling stability of 635 mA h g −1 capacity retention over 2000 cycles at 2 A g −1 . Additionally, it also shows good electrochemical performance as an anode material for SIBs and PIBs. This work demonstrates the superiority of ultrafine crystal confined in a 3D porous carbon network to boost the electrochemical performance in various fields.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dongdong Yang,Shun Dong,Jianqiang Xin,Chen Liu,Peitao Hu,Liansen Xia,Changqing Hong,Xinghong Zhang
Carbon aerogel (CA) has been generally regarded as a potential electromagnetic wave (EMW) absorber, but unsatisfactory microwave absorption, mechanical and anti-oxidation properties are still the primary challenges for its application. Herein, a novel C/SiOC composite aerogel (CSA) was successfully synthesized by a simple copolymerization of dual sols, ambient pressure drying and thermal treatment process for the first time. The morphology and performance of the as-prepared CSA could be tailored just by controlling the initial ratio of silane and phenolic resin (PR) to adjust the content of SiOC in CSA, whose density was in the range of 0.252 to 0.294 g·cm −3 with a low thermal conductivity from 0.061 to 0.067 W·m −1 ·K −1 . Notably, the EMW absorption capacity of CSA was greatly enhanced with the increase of SiOC content, with the optimal reflection loss (RL ) value of −67.85 dB and effective absorption bandwidth (EAB) of 6.88 GHz, which was dramatically improved than CA (–22.89 dB, 5.34 GHz) and mainly ascribed to the optimized impedance matching characteristics and strong attenuation capacity. Meanwhile, compared with CA (2.63 MPa) with a density of 0.248 g·cm −3 , the mechanical properties of CSA (3.30–5.12 MPa) were also remarkably improved, and the maximum compression strength was nearly doubled. Furthermore, CSA obtained superior oxidation resistance than CA and exhibited excellent flame-retardant properties. All the results indicated that CSA could be considered as a highly promising candidate for applications in extreme environments due to its lightweight, high strength and outstanding microwave absorption capacity along with good oxidation resistance, superior thermal insulation performance and high flame retardancy.
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高影响因子
Journal of Energy Storage
·
2023
·
IF 9.4
Yang Yang,Ruiying Wang,Shanliang Chen,Lan Jiang,Qiao Liu,Lin Wang,Weiyou Yang,Feng Hu,Weijun Li
In the present work, we report the exploration of rationally designed electrodes based on quasi-aligned nanoarrays composited by the cores of SiC nanowires and shells of sulfur-doped porous carbons (SiC@PC-S), which are directly employed as the free-standing electrodes for Zn-ion hybrid supercapacitors . They behave an ultrahigh areal capacitance of 38.24 mF/cm 2 at a scan rate of 10 mV/s, with an exceptional rate capability (~20.67 mF/cm 2 even at 1000 mV/s). The as-constructed hybrid supercapacitors deliver a remarkable energy of 10.6 μWh/cm 2 , which is the highest one among SiC-based supercapacitors ever reported. Moreover, such hybrid devices exhibit a high power density of 7.2 mW/cm 2 and a robust cycle stability with ~97 % capacitance retention after 5000 cycles at 2 mA/cm 2 , representing their promising practical applications.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Li Feng,Xiaoyun Lin,Junhui Feng,Xiaoqin Min,Yongnian Ni
This study presents the preparation of a novel electrochemical non-enzymatic sensor for the detection of glucose in natural saliva based on a metal organic framework (MOF) derivative (Cu-MOF-C) and nickel nanoparticle (NiNP) composite modified glassy carbon electrodes (GCE). The morphology and structural evolution were thoroughly characterized using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), ultraviolet and visible spectrum (UV) and Fourier transform infrared spectrum (FTIR). Moreover, the electrocatalytic activity of the NiNPs/Cu-MOF-C/GCE for glucose was investigated using cyclic voltammetry (CV) and the amperometric i-t technique. The NiNPs/Cu-MOF-C/GCE sensor exhibits a wide linear range of 0.3–1150 μM and low detection limit (DL) of 0.090 μM at a signal/noise ratio (S/N) of 3. The average recovery rate of this method is satisfactory between 97.3% and 108.4%. Furthermore, the sensor exhibited excellent repeatability, good stability and reproducibility for glucose detection. Compared with traditional invasive measurement, the detection of glucose in natural saliva can reduce the pain caused by continuous blood collection, which is an ideal method for patients requiring continuous monitoring of glucose.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Xinhui Liu,Jing Xie,Yakun Tang,Jia Guo,Zhenjiang Lu,Baolin Liu,Hongyu Zhang,Yali Cao
Large designs are devoted to decrease the volume fluctuation and pulverization of bismuth anodes. However, further advances in cycling stability at higher current density remain challenging. Herein, we skillfully designed a unique sandwich structure composed of bismuth nanoparticles coated with carbon nanolamella (Bi@C) and carbon nanolayers (C NL) via a simple pyrolysis method. Benefiting from the synergistic effect of the unique interlayer hybrid structure, the Bi@C composite material has an interconnected electron transportation pathway, which effectively alleviates the volume expansion during alloying/dealloying and reduces the agglomeration of the Bi particles during cycling. In addition, the Bi@C embedded in the double carbon layers structure (Bi@C/C NL) not only serve as highly conductive networks for Li + , but also provide a large surface area for electrolyte penetration and storage, which will enhance the charge transfer reaction kinetics process. As a result, the Bi@C/C NL-700 anode revealed a superior capacity (427.5 mAh g −1 at 500 mA g −1 after 300 cycles), excellent long cycling stability (373 mAh g −1 at 3 A g −1 after 1500 cycles) and improved rate performance, outperforming the most reported Bi-based anode materials for lithium-ion batteries. This work will lay an experimental foundation for the rational design of high-performance anode materials in rechargeable batteries with layered hybrid structures.
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高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2022
·Vol. 29
·期 13
·e202203097
·
IF 5.02
Ruixia Yang,Qiaohong Peng,Adeel Ahmed,Fengyuan Gao,Bing Yu,Youqing Shen,Hailin Cong
Graphical MB and PMS are absorbed by the Fe 3 O 4 /C shell and subsequently diffuse into the interior cavity of the yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites. PMS enter the catalyst and interact with active sites on the shell and in the core. Co 2+ and Fe 2+ in the catalyst can activate PMS to generate SO 4 ⋅ − . Meanwhile, OH − /H 2 O will be oxidized by SO 4 ⋅ − to ⋅OH, generating H + while consuming OH − . SO 4 ⋅ − , ⋅OH and , resulting from a typical chain reaction, will interact with MB and breakdown it to intermediates CO 2 and H 2 O. The yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites with Co 3 O 4 as the core, Fe 3 O 4 /C as the shell, and a cavity structure were synthesized by the hard template method. The physical and chemical properties of the composites were characterized by SEM, TEM, XRD, TGA, XPS, BET, and VSM. The specific surface area of yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites is 175.9 m 2 g −1 , showing superparamagnetic properties. The yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites were used as heterogeneous Fenton catalysts to activate peroxymonosulfate (PMS) to degrade MB, which showed high catalytic degradation performance. The degradation rate of MB reached 100 % within 30 min under the circumstances of the yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites dosage of 0.1 g L −1 , the PMS dosage of 1.0 g L −1 , the initial MB concentration of 100 mg L −1 , an initial pH of 5.5, and a temperature of 30±2 °C. The enhanced catalytic performance of the yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites can be attributed to the synergistic effect of the two catalytically active materials and the middle cavity. The effects of different operating parameters and co-existing anion species on MB degradation were also investigated. Electron paramagnetic resonance (EPR) analysis and quenching experiments confirmed that the formation of SO 4 ⋅ − in the yolk-shell Co 3 O 4 @Fe 3 O 4 /C/PMS system contributes to MB degradation. In addition, yolk-shell Co 3 O 4 @Fe 3 O 4 /C nanocomposites can be easily separated from the pollutant solution under the action of an external magnetic field, and the degradation rate of MB can still reach 98 % after five cycles, indicating that it has good stability and reusability and has broad application prospects in the field of water purification.
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PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xiaoqing Wang,Jing Zhang,Rui Wang,Yujie Ren,Shiyao Jin,Shimin Wang,Hongjing Lu,Yongjiang Wang,Junzi Zhao,Chunhua Xiong
We present a strategy for the modification of an ion-exchange resin (D113) as an inexpensive carbon source to obtain a macrospherical photocatalyst precursor that can be transformed into a stable all-solid-state Z-scheme heterojunction catalyst (denoted Bi 2 O 3 -Co 3 O 4 @C). X-ray diffractometry and Fourier transform infrared and Raman spectroscopy measurements confirmed the presence of highly graphitized carbon in the complex. Significantly, the cost of the as-prepared material was only 1/200 of that of commercial carbon nanotubes and 1/80 of that of graphene oxide . Aided by the organic carbon source, Bi 2 O 3 -Co 3 O 4 @C showed an enhanced light absorption, hindered electron–hole recombination, and an enhanced photocurrent response. Under simulated solar irradiation, Bi 2 O 3 -Co 3 O 4 @C (20 mg/L) showed degradation efficiencies of 100%, 47.52%, 94.28%, and 100% for methylene blue, rhodamine B, tetracycline, and Cr(VI), respectively, after 120 min. Herein, the highest turnover frequency (TOF) obtained under irradiation was 2.5 h −1 for Cr(VI). Further, the degradation efficiency for methylene blue trihydrate remained 91.46% after five cycles, indicating significantly higher stability than that of a catalyst prepared without graphitic carbon. The optimized band structure and photocatalytic mechanism of Bi 2 O 3 -Co 3 O 4 @C were determined based on ultraviolet-visible measurements and plane-wave density functional theory calculations in VASP. The findings of this study indicate the promise of the Bi 2 O 3 -Co 3 O 4 @C macrospheres for industrial applications based on their photocatalytic performance, high stability, low cost, and suitable particle size.
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