ELECTROCHIMICA ACTA
·
2023
·
IF 6.6
Liang Tan,Yijin Wu,Deliang Cheng,Renzong Hu
High-capacity storage in Li-ion batteries with graphite anodes remains a challenge at low temperature. By contrast, metal-based composite anode materials, including Sn metal, have shown good lithium storage capabilities at low temperature. However, the suitable low temperature electrolyte is still infancy to achieve high efficiency capacity of Sn-based anode in ultra-low temperature. Herein, a 2-methytetrahydrofuran (2Me-THF)-based low temperature electrolyte is proven to support the excellent lithium capability of Sn-based anode at ultra-low temperatures. The formulated 2Me-THF electrolyte exhibited small changes in viscosity and ionic conductivity with decreasing temperature. A SnO 2 -LiF-G (graphite) electrode with 1 M lithium bis(trifluoromethanesulfonyl)imide-(2Me-THF) electrolyte maintained 80% of the room temperature reversible capacity at -30°C and delivered a reversible capacity of 650 mAh g −1 , even at -50°C, under a current density of 100 mA g −1 . Furthermore, a detailed characterization based on Fourier Transform Infrared Spectroscopy, X-ray Photoelectron Spectroscopy and Time-of-flight Secondary ion Mass Spectrometry confirmed that the formed inorganic-rich solid electrolyte interphase on the electrode surface effectively maintained the solid-liquid interfacial stability at low temperature. This work provided design concepts for ultralow temperature electrolytes for metal-based anodes, which were especially helpful for further promoting batteries for low temperature applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Qiduo Chen,Shan Tang,Dong Feng,Yuhui Xie,Feng Wu,Delong Xie,Yi Mei,Tianbiao Zeng
As a typical conversion alloyed anode material , Germanium selenide (GeSe 2 ) exhibits isotropic lithiation behavior and high theoretical charge-discharge specific capacity. However, pure GeSe 2 anode faces significant volume expansion (∼250 %−360 %) and further exploration is needed in the preparation of flexible electrode materials and structural design. Herein, a simple strategy is designed to load GeSe 2 /C-2 nanoparticles with porous carbon-coated structure on a flexible cross-networking substrate. The 3D network substrate is composed of highly conductive carbon nanotubes and adhesive cotton cellulose fibers. A two-step method involving coating and cross-linking is designed to achieve the fabrication of self-supporting flexible electrodes. As an anode for LIBs , the one layer GeSe 2 discs with ∼0.65 mm thickness manifest capacities of 827.1, 744.4, 676.3, and 472.9 mAh g −1 at 0.1, 0.2, 0.5, and 1 A g −1 , respectively. This superior Li + storage performance can be attributed to the positive collective impact from the integration of nano-scale material, low crystalline properties, and carbon sponge skeleton. Furthermore, the GITT tests indicate that the diffusion coefficient of Li + in the GeSe 2 -based electrodes ranged from 10 −15 to 10 −12 cm 2 /s, and the thickness of the flexible electrode (including two layers) has a negligible impact on its electrochemical performance.
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CRYSTENGCOMM
·
2021
·Vol. 23
·期 8
·1777-1784
·
IF 3.545
Xiaowei Shi,Ping Yang,Yongyong Cao,Chao Dai,Weiqing Ye,Lingxia Zheng,Zhefei Zhao,Jianguo Wang,Huajun Zheng
Designing non-noble-metal electrocatalysts with high catalytic activity and stability towards hydrogen evolution reaction is vitally necessary for the demands of renewable and clean energy sources. Herein, an advanced water reduction electrocatalyst with a two-dimensional (2D) morphology based on CoP embedded on the surface of nanocarbon (CoP@C) is fabricated, which is derived from 2D Co-MOF by low-temperature phosphorization. Benefiting from the unique 2D morphology as well as more exposed (211) facet, such electrocatalyst exhibits superior catalytic activity in both alkaline and acid media in comparison to the traditional three-dimensional (3D) structure CoP@C with the overpotentials of 127 and 236 mV for HER at the current density of 10 mA cm−2, respectively. Density functional theory simulations unveil that the binding energies of the adsorbed intermediate species become more appropriate on the (211) facet compared with that on the (011) facet. This could improve the dissociation of H2O and desorption of H*, and thus facilitate the electrocatalytic activity. Moreover, the 2D electrocatalyst demonstrates enhanced electrocatalytic oxygen evolution reaction performance compared with its 3D counterparts. When the 2D CoP@C is employed as both the anode and cathode, a potential of 1.67 V is required to achieve the 10 mA cm−2 current density. In addition, it still exhibits good durability and even continued to work for 50 h.
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Fang Xu,Qing Xia,Guoping Du,Zhaoyang Fan,Nan Chen
Transition metal phosphides (TMPs), used in hybrid supercapacitors (HSCs) as battery–type electrodes, have gain tractions for balancing the requirements for both power and energy; however, their poor structural integrity, inferior conductivity and low porosity restrict the achievable performance. Developing an elaborate material architecture for electrodes that endows mechanical robustness, superior conductivity and large surface area is a pressing need for TMPs to achieve boosted performance in supercapacitors. Here, we report a coral–like interconnected Ni 2 P nanoparticles dispersed on porous amorphous carbon matrix (Ni 2 P@C) as the electrode material with superior electrochemical performance. The Ni 2 P@C electrode exhibits a superior specific capacity of 3,631mC cm −2 at 1 mA cm −2 (979 C g −1 at 1 A g −1 ). Impressively, the assembly of Ni 2 P@C and active carbon (AC) electrodes result in an advanced HSC with energy density of 44.0 Wh kg −1 at 800 W kg −1 and cycling stability of 90.5% retention after 10,000 cycles, demonstrating this unique Ni 2 P@C structure is promising for developing practical HSC technology.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yanling Li,Jinfu Ma,Shaolin Yang,Lihua Cui,Hui Lu
Material defects play an important role in metal oxide-based or hydroxide-based supercapacitors . Oxygen vacancies as anion vacancy defects can not only offer a high electron conductivity by act as shallow donors but also can adjust the materials’ surface properties. Herein, we synthesis a novel oxygen-vacancy-rich Co(OH) 2 /SnOᵪ/C hybrid nanosheets which are prepared by using a facile one-step hydrothermal route. Possessing special petal-like nanosheets and rich oxygen vacancies, the as-prepared dual ligand hybrid nanosheets (marked Co(OH) 2 /SnOᵪ/C) present a high specific capacitance of 806.36 F g −1 at 1 A g −1 , much higher than single ligand compound (338.36 F g −1 or 450.00 F g −1 ). The solid-state asymmetrical supercapacitors assembled with Co(OH) 2 /SnOᵪ/C show energy density of 49.73 Wh kg −1 with a power density of 1599.98 W kg −1 , and good cycle stability with 64.43% capacitance retention after 20,000 cycles at the current density of 1 A g −1 .
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Nano Research
·
2021
·Vol. 15
·期 3
·1949-1958
·
IF 8.897
Zhao Chen,Guo Shien,Li Qi,Liu Jianan,Zheng Mang,Xiao Xudong,Jiang Baojiang,Fu Honggang
Fenton or photocatalytic degradations of organic contaminants are recognized as promising approaches to address the increasing environmental pollution issues. Herein, we develop the effective synergistic catalysis reaction of Fenton and photocatalysis based on a loofah sponge-like Fe 2 O x /C nanocomposite, which exhibits excellent nitrobenzene photocatalytic degradation property. It is noted that Fe 2 O 3 nanoparticles with surface Fe 2+ species were encapsulated with an ultrathin carbon layer (denoted as Fe 2 O x /C) via a supramolecular self-sacrificing template and following thermal treatment process. The experimental results indicated that the thin layer carbon coating not only inhibited the Fe iron leaching from the Fe 2 O x but also prompted the separation and transferring of electrons-hole pairs. The introduction of Fe 2 O x /C enables the Fenton reaction to induce a rapid Fe 2+ /Fe 3+ cycle, and meanwhile, together with the photocatalytic reaction to produce continuous active substances for the subsequent degradation catalytic reaction without successive H 2 O 2 , resulting in the inexpensive and the effective photocatalytic procedure. As a result, 100% nitrobenzene (100 mg/L) was degraded and 97% of the organic carbon was mineralized in 90 min using the Fe 2 O x /C (0.1 g/L) at a low H 2 O 2 dosage (0.50 mM), under air mass (AM) 1.5 irradiation. Theoretical calculations confirmed that the Fe 2 O x /C-600 with thin carbon layer promoted the dissociation of H 2 O 2 and the ·OH desorption. The synergistic catalysis of this work may provide new ideas for low-cost and more efficient treatment of pollutants.
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CHEMOSPHERE
·
2021
·
IF 7.086
Yong Chen,Junfeng Zhao,Lu Hu,Jing Tian,Yong Liu
Most metal-organic frameworks (MOFs) are synthesized from carboxylate and metal precursors by hydrothermal process, which will consume a large amount of solvent and carboxylate. To address this issue, a new strategy for Cu-based MOFs was developed, in which the Cu-based MOFs was obtained by using abundant natural polymer (tannic acid) as one of the precursors and using high-energy ball milling to achieve a self-assembly of tannic acid and copper sulfate. Based on this strategy, a novel Cu-based MOFs derivative (Cu x O@C composite) was synthesized by high-temperature sintering of Cu-based MOFs and used for sulfamerazine (SMR) removal via O 2 activation. The BET specific surface area and average pore size of Cu x O@C composite were 110.34 m 2 g −1 and 21.06 nm, respectively, which made Cu x O@C composite had the maximum adsorption capacity ( Q max ) for SMR of 104.65 mg g −1 and favored the subsequent degradation of SMR. The results from XRD and XPS indicated that Cu x O@C composite contained a lot of Cu 0 and Cu 2 O with the sizes of 76.6 nm and 9.8 nm, respectively, which led to its high performance of O 2 activation. The removal efficiency of SMR and 90.2% TOC achieved 100% and 90.2%, respectively in the Cu x O@C/air system at initial pH of 4.0, air flow rate of 100 mL min −1 , Cu x O@C dosage of 1 g L −1 and reaction time of 30 min. Reactive species, including H 2 O 2 , OH and O 2 - radicals were detected in the Cu x O@C/air system, and OH and O 2 - were mainly responsible for the degradation of SMR.
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PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2021
·
IF 1.134
Qiu-Mei FENG,Li QIN,Peng ZHANG,Dan LI,Ming-Kai LIU,Po WANG
Building a precise, sensitive, and selective sensing platform is highly significant for microRNA (miRNA) detection. Herein, an innovative ratiometric electrochemical biosensor sensitized with carbon nanoparticles-functionalized SnS 2 nanoflowers ( [email protected] 2 NFs) and enzyme-assisted target recycling was explored for analysis of miRNA-21. In this strategy, the application of hierarchical [email protected] 2 NFs structure as electrode material not only enhanced the surface loading capability for subsequent reactions but also improved the interfacial electron transfer. After introducing enzyme-assisted target recycling, single-target miRNA-21 could initiate the cleavage of multiple capture DNA strands by duplex-specific nuclease (DSN), leading to numerous rest single-strand DNAs on the electrode. Two probes, methylene blue-labeled probe 1 (probe 1-MB) and ferrocene-labeled probe 2 (probe 2-Fc), could selectively and competitively hybridize with the capture DNA and the rest single-strand DNA, depending on the completeness of DNA hybridization. By measuring the peak current intensity ratio of Fc and MB, miRNA-21 was quantified in a wide concentration range from 1 fmol/L to 10 pmol/L, with a detection limit of 300 amol/L. Moreover, this sensing system showed good analytical performance in the presence of interfering sequences and complex matrices, illuminating excellent selectivity and practical application potential of the hierarchical [email protected] 2 NF sensing interface.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 17
·3998-4005
·
IF 6.569
Weiwei Liu,Meng Xu,Menghua Zhu
Maximum energy storage in minimum charging time is increasingly important to evaluate the performance of lithium ion batteries (LIBs). High rate electrode materials require high ion and electron transport ability. Niobium tungsten oxides as emerging materials are employed as anodes for LIBs and show desirable rate performance owing to their high Li+ diffusion coefficients. However, most studies focus on the preparation and performance of niobium tungsten oxides at the nanoscale while electrode materials in micro grade result in high tap density and smaller electrode thickness with a shorter electron pathway under the same mass loading. Herein, Nb18W16O93/C spheres in micro grade with a carbon layer coating on Nb18W16O93 nanograins are synthesized via a facile solvothermal method. Owing to the enhanced electronic conductivity and protection of structural integrity by the carbon layer, the Nb18W16O93/C anode exhibits excellent rate performance with 182.8 mA h g−1 at a high rate of 5C with a capacity retention of 81% (based on 225.7 mA h g−1 at 0.2C). In addition, superior cycling stability is shown with a capacity retention of 85.6% at 1C after 100 cycles and 68% at 5C after 300 cycles. This stable anode material with advanced rate capability shows huge competitiveness as a candidate for fast charging materials of LIBs.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Yun-Yun Cheng,Tao Zhan,Xiao-Zhen Feng,Guo-Cheng Han
Novel synergistic effect between gold nanoparticles (AuNPs) and melamine (MEL) signal amplification were used to develop a sensor in this study to detect C-reactive protein (CRP). A ferrocene derivative (Fc-ECG) was used as electrochemical probe, as well as sensitive element, to prepare the sensor. The Fc-ECG/MEL/AuNPs/SPE disposable electrochemical sensor was fabricated by depositing AuNPs onto the SPE. Combination with MEL for their synergistic effect allowed for dual signal amplification, which was characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS) techniques. Under optimized conditions, the developed sensor presented a linear concentration range from 0.001 to 1000 μg mL −1 , and relationship between peak current response and logarithm of CRP concentration was represented by the following regression equation: I (μA) = 7.6468–0.78446 lgC (μg mL −1 ) with 0.99506 correlation coefficient (R 2 ). The detection limit for the sensor was 0.30 ng mL −1 and sensitivity was 11.10 μA μg −1 mL cm −2 . When compared to CS/Fc(COOH)/SPE sensor, the detection limit was lowered 1000 times, and sensitivity was improved 56 times by the prepared sensor. The sensor was also used in human serum samples, with 98.69–102.43% recovery and lower than 6.59% total R.S.D, indicating that it is also usable for rapid detection of CRP in actual samples.
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CHEMOSPHERE
·
2020
·
IF 5.778
Deyun Zhang,Yunong Li,Jing Guo,Lixiang Zhou,Yeqing Lan,Cheng Chen
In this study, magnetic Cu and Ni bimetallic particles embedded carbon sheets, namely as C@Cu–Ni, was derived via calcining a mixture of Cu-MOFs and Ni-MOFs (mass ratio = 4:6) under N 2 protection and served as a catalyst for the degradation of 2,4,6-trichlorophenol (2,4,6-TCP) by peroxymonosulfate (PMS). The results showed that more than 98.5% of 2,4,6-TCP (10 mg L −1 ) was rapidly decomposed at initial pH = 5, PMS = 1 mM and catalyst dosage = 0.1 g L −1 within 30 min, accompanied by 42.47% removal of total organic carbon (TOC). This fully confirmed that C@Cu–Ni possessed excellent catalytic performance for PMS activation . The radical quenching experiments and electron paramagnetic resonance (EPR) investigation testified that the reactive oxygen species (ROS) included SO 4 •− , • OH, O 2 •− radicals and singlet oxygen ( 1 O 2 ), which were responsible for the rapid degradation of 2,4,6-TCP. Among them, O 2 •− and 1 O 2 played a decisive role. Cyclic voltammograms (CV) and electrochemical impedance spectroscopy (EIS) revealed that C@Cu–Ni material possessed superior electrical conductivity and electron transfer , improving its catalytic activity . What is more, C@Cu–Ni displayed excellent stability and could be consecutively used for five times without any decline of catalytic performance. The main intermediates of the 2,4,6-TCP degradation were analyzed by high-performance liquid chromatography-mass spectrometry (HPLC-MS/MS) and possible pathways of 2,4,6-TCP degradation were further proposed. The extraordinary stability and superior catalytic activity of C@Cu–Ni coupled with its easy separation from wastewater due to magnetism suggest that the newly synthesized material may offer a promising alternative approach to efficiently degrade organic pollutants by PMS.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 35
·14970-14978
·
IF 3.288
Jingchuang Zhao,Yingzhen Zhang,Xianyu Kang,Yancai Li
Direct methanol fuel cells (DMFCs) have been extensively studied for developing a new non-precious metal catalyst to replace commercial platinum catalysts, due to their expensive cost and susceptibility to CO poisoning. In this work, nanocomposites of nickel oxide/nickel supported by N-doped carbon (NiO/Ni–N/C) were prepared by using a hydrothermal method and further carbonization at different temperatures. The surface morphology and composition of the NiO/Ni–N/C nanocomposites were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). As observed through electrochemical experiments, the NiO/Ni–N/C nanocomposite modified glassy carbon electrode (NiO/Ni–N/C/GCE) exhibits high electrocatalytic activity for the methanol oxidation reaction (MOR) in alkaline solution. Among the nanocomposites, NiO/Ni–N/C carbonized at 500 °C (NiO/Ni–N/C500) displays the highest mass activity (1043 mA mgNi−1) at 0.73 V (vs. Ag/AgCl), which is much higher than that of Ni(OH)2/N–C and NiO/Ni–N/C carbonized at other temperatures (400, 600, and 700 °C). In addition, the catalytic activity of NiO/Ni–N/C500 is 2.12 times that of the commercial Pt/C. NiO/Ni–N/C500/GCE also possesses fast kinetics, excellent stability and CO tolerance. Therefore, the NiO/Ni–N/C500 nanocomposites have great application potential as MOR catalysts.
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