ChemElectroChem
·
2022
·Vol. 9
·期 16
·e202200530
·
IF 4.782
Yuchen Wei,Zhipeng Chen,Lei Yang,Hongqiang Li,Xiaojun He
Graphical SUPERcaps : N/P/S co-doped carbon nanosheets (NPS-CNs) were synthesized by acid-free and alkali-free strategy from pyrene for supercapacitors, achieving a high-rate capability (201.2 F g −1 at 100 A g −1 ) and high cycle stability (93.4 % of initial capacitance after 30000 cycles). It is still a challenge to prepare heteroatoms-doped carbon materials for supercapacitors by an acid-free and alkali-free synthesis method. Herein, the N/P/S co-doped carbon nanosheets (NPS-CNs) were synthesized by an in-situ K 2 CO 3 and Na 2 S 2 O 3 ⋅ 5H 2 O double activation method from pyrene as carbon source, melamine-phytic acid supramolecular aggregate as N and P source without the presence of acid and alkali. The as-prepared NPS-CN featured three-dimensional cross-linked nanosheets with abundant pores, boosting the stability of carbon skeleton and promoting the transfer of ion and electron. The abundant micropores together with high heteroatom content (15.09 %) provided abundant active sites and defects for ion adsorption. Benefitting from these merits, the NPS-CN electrode exhibits a high specific capacitance of 485.1 F g −1 at 0.05 A g −1 as well as good rate performance of 350.3 F g −1 at 20 A g −1 in three electrode system. Simultaneously, the specific capacitance of the NPS-CN capacitor reached 305.0 F g −1 at 0.05 A g −1 and retained 201.2 F g −1 at 100 A g −1 in two electrode system. Importantly, NPS-CN capacitor presented an excellent cycle stability (93.4 % of initial capacitance after 30,000 charge/discharge cycles). This work opened a less harmful route to prepare NPS-CNs from small polycyclic aromatic hydrocarbons for energy storage devices.
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高影响因子
Materials Reports: Energy
·
2024
·
IF 0
Han Wang,Sidra Jamil,Muhammad Fasehullah,Shujuan Bao,Yi Li,Maowen Xu
Lithium-sulfur (Li-S) batteries are one of the most promising energy storage and conversion devices due to the high theoretical capacity and cost-effectiveness of sulfur. However, they still suffer from sluggish redox kinetics and the shuttle effect caused by complex polysulfides. In this work, graphitic carbon nitride (g-C 3 N 4 ) is utilized as a template and further hydrothermally treated with an Mn source and glucose. The pyrolysis of g-C 3 N 4 gives rise to N-doped carbon nanotubes, producing abundant sites for physical confinement and chemical adsorption of polysulfides, while glucose carbonization brings forth amorphous carbon and Mn source produces metal spheres. Afterward, polydopamine (PDA) induces N-doped carbon coating and promotes interface connection as well as electron immigration. This synergistic design possesses a high surface area of micropores and mesopores to aggregate sulfur and accelerate redox kinetics. As a result, the N-doped carbon nanotube with Mn spheres and PDA coating@sulfur (CN/Mn-PDA@S) exhibits a high reversible capacity of 813.5 mAh g −1 at 1 C with a decay rate of 0.064% per cycle and remarkable capacity retention at 2 C with rate performance up to 4 C. Therefore, the novel design of N-doped carbon nanotubes with Mn spheres and PDA coating serves as an efficient polysulfide immobilizer for Li-S batteries.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2020
·Vol. 24
·期 6
·1397-1404
·
IF 2.646
Yang Rong,Gong Sheng-min,Zhao Shang-qian,Zhao Chun-rong,Zhu Xiu-long,Sun Hao-bo,Zhang Li
S@CNT-G-TiN multi-dimensional composite materials with above 90 wt.% sulfur content were successfully synthesized via a facile suspension deposition method. The as-prepared S@CNT-G-TiN composite materials delivered an excellent initial specific capacity of 1291 and 642 mAh/g at 0.1 C and 3 C, respectively. The S@CNT-G-TiN cathode with 7.5 mg/cm 2 sulfur loading exhibited a reversible areal capacity of 7.7 mAh/cm 2 after 100 cycles, which proved that the S@CNT-G-TiN cathode was favored for the construction of high sulfur loading Li-S batteries. The superior electrochemical performance could be attributed to the specific CNT-G-TiN host, which provide a conductive network in the electrode and suppress the shuttle effect of lithium polysulfides (LiPSs). 5 Ah Li-S pouch cell was also fabricated by using the S@CNT-G-TiN cathode, which exhibited high-energy density of 401 Wh/kg and retained a stable cycling performance with an average capacity fading of 0.2% per cycle after 50 cycles, indicating the potential applications of S@CNT-G-TiN composite materials in high-performance Li-S batteries.
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Journal of Energy Chemistry
·
2020
·
IF 7.216
Ruihan Zhang,Maochun Wu,Xinzhuang Fan,Haoran Jiang,Tianshou Zhao
Currently, lithium-sulfur (Li-S) batteries still suffer from fast capacity decay, poor coulombic efficiency (CE) and short cycling lifespan, which result from the severe shuttle effect issue caused by high solubility and rapid diffusion of lithium polysulfides (LiPSs) in organic electrolytes. Here, yolk-shell zinc oxide (YS-ZnO) spheres are synthesized and for the first time, applied as a host for Li-S batteries to tackle this challenge. The polar ZnO exhibits high chemical anchoring ability toward LiPSs while the unique yolk-shell structure not only provides an additional physical barrier to LiPSs but also enables much more uniform sulfur distribution, thus significantly suppressing LiPSs shuttling effect meanwhile promoting sulfur conversion reactions. As a result, the YS-ZnO enables the Li-S battery to display an initial specific capacity of 1355 mAh g −1 and an outstanding capacity retention capability (~89.44% retention rate) even after 500 cycles with the average CE of ~99.46% at the current of 0.5 C. By contrast, the capacity of conventional-ZnO-nanoparticles based battery severely decays to 472 mAh g −1 after cycling for 500 times. More impressively, the S/YS-ZnO based Li-S battery can maintain a low decay rate of 0.040% every cycle and high average CE of 98.82% over 1000 cycles at 3 C.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Soodamani Periyasamy,Jun Hou,Yang Li,Natrayasamy Viswanathan,Zijun Yang,Guoxiang You,Jun Wu,Zhaoqin Huang
This study focuses on the fabrication of an effective heterojunction composite, CoTiO 3 /Cu-BDC-NH 2 MOF (CT@CuMOF) prepared for TC and Cr(VI) removal from water through a synergistic adsorptive-photocatalytic degradation process. CT@CuMOF composite exhibited maximum removal of 21.4 mg/g for TC and 42.1 mg/g for Cr(VI) under dark equilibrium, and visible light irradiation led to 72 % TC and 80 % Cr(VI) degradation within 30 min. VB-XPS results confirmed the alignment of band edges, supporting an S-scheme charge transfer mechanism between the p-type CT and n-type CuMOF. TEM results reveled a well-formed p-n heterojunction, while EIS and photocurrent density measurements demonstrated enhanced charge carrier mobility and separation. Kinetic results followed pseudo-second order for TC and Cr(VI), with Langmuir adsorption isotherm showing maximum capacities of 25.36 mg/g for TC and 45.94 mg/g for Cr(VI). ESR and radical scavenger studies confirmed hydroxyl (•OH) and superoxide (•O 2 − ) radicals as key species in TC degradation, while superoxide played dominant roles in Cr(VI) reduction. CT@CuMOF composite exhibited favorable thermodynamic conditions (ΔG° <0), endothermic processes (ΔH° >0) and excellent reusability (80 % retention after five cycles). This research highlights the novelty of CT@CuMOF composite as a sustainable material for water purification.
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PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2025
·
IF 2.5
Sleshi Fentie Tadesse,Worku Lakew Kebede,Dong-Hau Kuo
Visible-light-driven photocatalysis is an efficient and environmentally benign approach to mitigate organic pollutants from waste effluents. A facile one-step precipitation method was used to synthesize Fe–Mo3(O,S)4−x/La4Mo2O11 (FeLaMoOS) nanocomposites. The as-prepared materials were characterized by XRD, SEM, HR-TEM, XPS, PL, EIS, photocurrent, and UV-visible spectroscopy. The type I heterojunction formed between Fe–Mo3(O,S)4−x and La4Mo2O11 exhibited a maximum light absorption response in the visible spectrum. The FeLaMoOS composite (13% Fe and 20% La) demonstrated the highest degradation efficiency, degrading 97.5% MO and 99.2% RhB in 90 min. The removal efficiency of MB was 99.6% after 45 min of magnetic stirring in the dark. The enhanced catalytic efficiency can be attributed to the effective charge separation of photoinduced e−–h+ pairs due to doping and heterojunction formation. Superoxide radicals (O2˙−) played a dominant role, while hydroxyl radicals (˙OH) played only a minor role, in the photocatalytic degradation process. Possible photocatalytic degradation mechanisms of organic dye molecules were proposed, based on the active radical species involved and the band potentials of the photocatalysts. This study can be used to establish a simple and efficient strategy for designing reusable composite photocatalysts for the degradation of organic dyes.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2025
·Vol. 172
·期 1
·010529
·
IF 3.3
Kemeng Song,Yuan Yuan,Hanbing Chen,Ping Lu,Ning Li,Ningyi Yuan,Fanglei Zeng
This study presents a systematic investigation of three cyclic phosphazene-based flame retardant additives, hexachlorocyclotriphosphazene (HCCP), hexafluorocyclotriphosphazene (HFPN), and ethoxy-pentafluorocyclotriphosphazene (EtPFPN), for ether-based electrolytes in lithium-sulfur batteries. Through comprehensive analysis of molecular orbital calculations, self-extinguishing time measurements, and electrochemical characterization, we reveal distinct structure-dependent flame retardancy mechanisms and their impact on battery performance. HCCP demonstrates superior flame suppression through P-Cl bond decomposition but exhibits electrochemical instability above 15 wt%. HFPN functions primarily as a co-solvent, achieving significant flame retardancy above 20 wt% while maintaining stable electrochemical performance. EtPFPN emerges as the most promising candidate, effectively integrating into the electrolyte solvation structure to provide optimal flame retardancy, though requiring higher concentrations for complete suppression. Notably, synergistic effects between LiNO3 and the flame-retardant additives enhance both safety and electrochemical stability. These findings provide critical insights for the molecular design of flame-retardant electrolytes in high-performance Li-S batteries, demonstrating the importance of balancing safety enhancement with electrochemical stability through strategic additive selection and concentration optimization.
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高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2014
·
IF 3.377
Yucui Hou,Jian Li,Shuhang Ren,Muge Niu,Weize Wu
Because of similar properties and very low volatility, isomers of benzene poly(carboxylic acid)s (BPCAs) are very difficult to separate. In this work, we found that isomers of BPCAs could be separated efficiently by quaternary ammonium salts (QASs) via formation of deep eutectic solvents (DESs). Three kinds of QASs were used to separate the isomers of BPCAs, including the isomers of benzene tricarboxylic acids (trimellitic acid, trimesic acid, and hemimellitic acid) and the isomers of benzene dicarboxylic acids (phthalic acid and isophthalic acid). Among the QASs, tetraethylammonium chloride was found to have the best performance, which could completely separate BPCA isomers in methyl ethyl ketone solutions. It was found that the hydrogen bond forming between QAS and BPCA results in the selective separation of BPCA isomers. QAS in DES was regenerated effectively by the antisolvent method, and the regenerated QAS was reused four times with the same high efficiency.
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PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Zhenzhong Hu,Jiawei Zhang,Guoqing Yang,Sheng Xu,Mengmeng Zhen,Sheng-qi Guo,Honghong Lyu,Xiaoman Liu,Boxiong Shen
Adjusting the composition and microstructure of multiphase nanocomposites is a promising way to increase the storage capacity of the electrode. In this work, cobalt ion leachate is recovered from the cathode material of spent lithium cobalt oxide batteries through molten salt-assisted calcination and water leaching process. Using the cobalt ion leachate as the precursor, spherical Co x Ni 3-x -MOF precursors are synthesized via a solvothermal method and subsequently carbonized and sulfurized in an Ar 2 atmosphere, yielding spherical core-shell structured Co x Ni 3-x -S bimetallic sulfides. Electrochemical tests indicate that this material exhibits excellent specific capacitance (1285 F/g) at a current density of 1 A/g, significantly outperforming traditional cobalt-nickel-based materials (such as NiCo 2 O 4 with ∼800 F/g). The enhanced performance is attributed to the increased specific surface area and active sites of the spherical core-shell structure, as well as the optimized electron transfer and redox reaction kinetics facilitated by the Co/Ni bimetallic synergy. The sulfidation treatment further improves conductivity and structural stability. Additionally, an asymmetric supercapacitor using Co x Ni 3-x -S as the cathode and corn-straw-derived activated carbon (CAC) as the anode achieves an energy density of 38.6 Wh/kg at a power density of 800 W/kg, demonstrating good cycling stability with 71% capacitance retention after 3000 cycles. These improvements are the result of the synergistic effects between the metal sulfides and the bimetallic cobalt-nickel components, as evidenced by electrochemical performance testing and Transmission Electron Microscopy (TEM). This highlights the potential of the spherical Co x Ni 3-x -S core-shell structured materials for use in high-performance supercapacitors.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Ziheng Wei,Yongping Liu,Qi Ding,Yuena Zhang,Yu Ren,Jihu Chen,Mingming Si,Yuchi Fan,Wan Jiang
Conductive two-dimensional (2D) materials exhibit excellent electromagnetic wave (EMW) absorption properties at high frequencies due to their high conductivity loss. However, their unsatisfactory EMW absorption at low frequencies, attributed to impedance mismatch, remains a significant challenge. In this work, high-conductivity 1T′ WTe 2 nanosheets were incorporated into insulating mesoporous channels of Santa Barbara Amorphous-15 (SBA-15) via chemical vapor deposition (CVD), resulting in the formation of 1T′ WTe 2 /SBA-15 composites. These mesoporous channels restrict the growth of 1T′ WTe 2 and hinder carrier migration cross the channels, reducing their conductivity. Meanwhile, heterogeneous interfaces were formed between 1T′ WTe 2 nanosheets and mesoporous channels of SBA-15, accompanied by defects within the 1T′ WTe 2 nanosheets. This interaction promotes dipole polarization losses, significantly enhancing the attenuation of incident EMW, particularly at low frequencies. Consequently, the effective absorption bandwidth (EAB) of 1T’ WTe 2 /SBA-15 composites within the S band reached to 0.72 GHz, ranging from 3.28 GHz to 4.0 GHz, with a minimum reflection loss (RL min ) of −26.5 dB at 3.68 GHz. Furthermore, the EAB of the composites extended to 3.92 GHz at 1.5 mm in the high-frequency range. This work introduces a novel strategy for enhancing EMW absorption performance in the S band through heterogeneous interfaces and defect engineering, driven by the limiting effects of mesoporous channels.
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高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
An-Min Fei,Liang Wu,Mei-Tong Wei,Wen-Hua Shi,Zhi Qian,Zong-Bu Qin,Hemdan S.H. Mohamed,Zhi-Yi Hu,Jing Liu,Yu Li,Bao-Lian Su
The silicon (Si) anode boasts an exceptionally high theoretical capacity (4200 mAh g −1 ), making it an attractive candidate for advanced lithium-ion batteries (LIBs). However, its practical application is limited by poor electrical conductivity and disastrous volume expansion. In this work, we have successfully synthesized a yolk-shell composite material (Si@H-CoNPSC) consisting of N, P, S co-doped carbon encapsulated silicon nanoparticles (SiNPs) via a self-template method based on the Kirkendall effect. The Si@H-CoNPSC anode exhibits excellent electrochemical performance, after 300 cycles, keeping a specific capacity of 872.8 mAh g −1 at 1 A g −1 . Additionally, after 150 cycles, it retains 1305.8 mAh g −1 at 0.5 A g −1 , with a capacity retention of 91.1 %. These outstanding results are mainly due to the co-doped hollow carbon shell, which improves the anode’s conductivity and reduces volume changes during cycling. This study provides new insights for the designing of silicon-carbon anode structures for high-performance LIBs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Renzhi Xiong,Yiting Sun,Jiahao Huang,Fangde Liu,Yanhe Xiao,Baochang Cheng,Shuijin Lei
Photocatalytic production of H 2 O 2 faces challenges such as low charge separation efficiency, narrow light absorption, and sluggish reaction kinetics. This study developed a WO 3− x @Zn 3 In 2 S 6− x S-scheme heterojunction and designed atomic-level W S interface chemical bonds through a defect-induced strategy to address these challenges. Oxygen/sulfur vacancies not only promote the formation of chemical bonds but also trigger a local surface plasmon resonance effect (LSPR) in WO 3− x , enabling full-spectrum light harvesting and photothermal heating. The S-scheme charge transfer retains the high-energy electrons in Zn 3 In 2 S 6− x and holes in WO 3− x to realize dual H 2 O 2 generation pathways. Coupled with LSPR-induced thermal activation, this multidimensional strategy achieved an unprecedented H 2 O 2 yield (3891.2 μmol g −1 h −1 ) under simulated sunlight, which is 9.2 times and 161.5 times higher than that of the non-thermally activated pristine Zn 3 In 2 S 6− x and WO 3− x , respectively. In situ X-ray photoelectron spectroscopy and a series of photoelectrochemical measurements confirmed the S-scheme charge dynamics, and electron spin resonance verified the thermally enhanced reactive oxygen species generation. This work establishes defect-mediated heterointerfacial engineering as a universal paradigm for solar-to-chemical energy conversion and provides feasible insights for designing photothermal-assisted photocatalytic systems.
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高影响因子
危险品化学品经营许可证（带存储）