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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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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CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 45
·10314-10320
·
IF 4.857
Guiqiang Cao,Zhikang Wang,Da Bi,Jing Zheng,Qingxue Lai,Yanyu Liang
Graphical Atomic cat : A single-atom Fe@NG electrocatalyst serves as the coating of separators for high-performance Li-S batteries. Atomically dispersed Fe sites on the graphene framework promote the conversion efficiency of LiPS. The Fe@NG electrocatalyst delivers an initial capacity of 1616 mA h g −1 at 0.1 C, and a reversible capacity of 546 mA h g −1 after 200 cycles at 2 C (70 % capacity retention). Lithium-sulfur batteries have been considered as potential electrochemical energy-storage devices owing to their satisfactory theoretical energy density. Nonetheless, the inferior conversion efficiency of polysulfides in essence leads to fast capacity decay during the discharge/charge cycle. In this work, it is successfully demonstrated that the conversion efficiency of lithium polysulfides is remarkably enhanced by employing a well-distributed atomic-scale Fe-based catalyst immobilized on nitrogen-doped graphene (Fe@NG) as a coating of separator in lithium-sulfur batteries. The quantitative electrocatalytic efficiency of the conversion of lithium polysulfides is determined through cyclic voltammetry. It is also proven that the Fe-N X configuration with highly catalytic activity is quite beneficial for the conversion of lithium polysulfides. In addition, the adsorption and permeation experiments distinctly indicate that the strong anchoring effect, originated from the charge redistribution of N doping into the graphene matrix, inhibits the movement of lithium polysulfides. Thanks to these advantages, if the as-prepared Fe@NG catalyst is combined with polypropylene and applied as a separator (Fe@NG/PP) in Li-S batteries, a high initial capacity (1616 mA h g −1 at 0.1 C), excellent capacity retention (93 % at 0.2 C, 70 % at 2 C), and superb rate performance (820 mA h g −1 at 2 C) are achieved.
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Journal of the Korean Ceramic Society
·
2025
·
IF 3.8
Zhang Feng-Jun,Zhang Jun-Jie,Zhu Meng-Yuan,Wang Ying-Rui,Li Dong-Cai,Oh Won-Chun
Cu 2 MoS 4 became a novel active alternative material to noble metal co-catalysts, which can effectively promote photocatalytic hydrogen evolution. To investigate the effect of Cu 2 MoS 4 on the photocatalytic performance of Zn-VIA compounds, ZnO, ZnS, ZnSe, and ZnTe were composited with Cu 2 MoS 4 to construct the photocatalysts, and we analyzed the four catalysts for the crystal structure, microscopic morphology, photoelectronic properties, and hydrogen evolution performance. Comparing the four different photocatalysts, the composite of ZnSe and Cu 2 MoS 4 has the highest photocatalytic hydrogen evolution efficiency, and the hydrogen evolution rate of the optimal ratio of ZSeC-20 reaches about 2617 μmol/g/h, which is about 46 times higher than that of pure ZnSe. It is attributed to the loading of Cu 2 MoS 4 to build a heterogeneous structure, which reduces the photogenerated electron and hole recombination rate, which enhances the photocatalytic water splitting hydrogen evolution rate.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qun Li,Qingze Jiao,Yu Yan,Huanjun Li,Wei Zhou,Tingting Gu,Xueran Shen,Chengxing Lu,Yun Zhao,Yaoyuan Zhang,Hansheng Li,Caihong Feng
The sluggish kinetics and severe volume expansion are two major drawbacks that limiting the application of transition metal sulfides electrode materials for sodium ion batteries (SIBs). Herein, we assembled Ti 3 C 2 T x MXene nanosheets into thin-walled hollow spheres with PMMA spheres as sacrificial template, on which MOF-derived CoS 2 nanoparticles embedded in N-doped carbon were grown (MXene@CoS 2 /NC). The MXene@CoS 2 /NC exhibits state-of-the-art sodium ion storage properties, including a high reversible capacity of 620 mAh g −1 at 0.2 A g −1 , superior rate capability (394 mAh g −1 at 5 A g −1 ), and excellent cycling stability (355 mAh g −1 after 5000 cycles). The corresponding electrochemical tests prove that the MXene@CoS 2 /NC has fast Na + ion diffusion and electron transfer compared with its counterpart without MXene interfaces. XPS and XANES characterizations disclose the introduced MXene and increased pyrrolic N can weaken the Co-S bonds of CoS 2 , which facilitates the conversion reaction between CoS 2 and Na 2 S, and thus improves the sodium storage kinetics. The DFT calculations also demonstrate the MXene can improve the conductivity of electrode materials by fast interfacial electron transfer. In addition, the MXene hollow spheres and MOF-derived NC provide host structures for CoS 2 , which can increase the contact between electrolyte and active materials, buffer the volume expansion of CoS 2 , and thus enhancing the electrochemical stability. This work provides a feasible strategy to construct anode materials for SIBs with improved sodium storage kinetics and cycling stability.
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CHEMISTRY-A EUROPEAN JOURNAL
·
2020
·Vol. 26
·期 7
·1624-1632
·
IF 4.857
Yanqi Wang,Zhipeng Zhu,Zhaofeng Sun,Qianqian Hu,Jianrong Li,Jiang Jiang,Xiaoying Huang
Graphical Fine tweaking . Six heterometallic T5 selenides and their Se/S solid solutions M-In-Q (M=Cu or Cd; Q=Se or Se/S) have been solvothermally synthesized by a two-step method. The T5 selenide clusters, the largest supertetrahedral T n clusters reported to date, show photocatalytic activity that can be tuned according to their constituent components. Although supertetrahedral T n sulfide clusters ( n= 2–6) have been extensively explored, the synthesis of T n selenide clusters with n >4 has not been achieved thus far. Reported here are ionic-liquid (IL)-assisted precursor route syntheses, characterizations, and the photocatalytic properties of six new M-In-Q (M=Cu or Cd; Q=Se or Se/S) chalcogenide compounds, namely [Bmmim] 12 Cu 5 In 30 Q 52 Cl 3 (Im) (Q=Se ( T5-1 ), Se 48.5 S 3.5 ( T5-2 ); Bmmim=1-butyl-2,3-dimethylimidazolium, Im=imidazole), [Bmmim] 11 Cd 6 In 28 Q 52 Cl 3 (MIm) (Q=Se ( T5-3 ), Se 28.5 S 23.5 ( T5-4 ), Se 16 S 36 ( T5-5 ); MIm=1-methylimidazole), and [Bmmim] 9 Cd 6 In 28 Se 8 S 44 Cl(MIm) 3 ( T5-6 ). The cluster compounds T5-1 and T5-3 represent the largest molecular supertetrahedral T n selenide clusters to date. Under visible-light illumination, the Cu-In-Q compounds showed photocatalytic activity towards the decomposition of crystal violet, whereas the Cd-In-Q compounds exhibited good photocatalytic H 2 evolution activity. Interestingly, the experimental results show that the photocatalytic performances of the selenide/sulfide solid solutions were significantly better than those of their selenide analogues, for example, the degradation time of the organic dye with T5-2 was much shorter than that with T5-1 , whereas the photocatalytic H 2 evolution efficiencies with T5-3 – T5-6 improved significantly with increasing sulfur content. This work highlights the significance of IL-assisted precursor route synthesis and the tuning of photocatalytic properties through the formation of solid solutions.
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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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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Shanshan Feng,Jingwei Liu,Jingshuai Gao,Wenhao Jia,Hao Fang,Na Li,Lu Yang,Yao Lu,Sheng Feng,Shouzhu Li
Solar interfacial distillation has emerged as a widely recognized method for producing clean water due to its environmentally friendly and energy-efficient attributes. Nevertheless, the presence of semi-volatile organic compounds (s-VOCs) in wastewater can significantly compromise the quality of the purified water. This study presents the preparation of multifunctional fiber evaporators (CuFC/SiO 2 -SH NFs) by growing copper ferrocyanide (CuFC) on the surface of shell-belt-shaped thiol-functionalized SiO 2 nanofibers (SiO 2 -SH NFs). The CuFC particle layer functions both as a photothermal component and as a heterogeneous Photo-Fenton catalyst, facilitating the in-situ degradation of s-VOCs during photothermal evaporation. The composite nanofibers demonstrated a solar-to-vapor conversion efficiency of 84.90 % under 4-sun illumination. Furthermore, they achieved a degradation efficiency exceeding 99 % for low-concentration nitrobenzene (NB) solutions (0 ∼ 1 mg/L). This study underscores the potential of CuFC/SiO 2 -SH NFs as an effective material for solar water purification and offers valuable insights into optimizing the Photo-Fenton reaction for environmental applications.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Xiaojun Wang,Haichang Li,Changmeng Xu,Hongran Sun,Cheng Fan,Wenming Song,Huifang Li,Jiangshan Gao,Zhiming Liu,Yan He
Sodium-ion batteries (SIBs) have attracted widespread attention because of the economic benefit of low-cost and abundance of sodium resources. Iron-based electrodes (sulfide, selenide and phosphide) that operate through conversion mechanism have shown huge potential for excellent sodium-ion storage. However, the problems related with serious volume expansion and lack of general synthesis methods of iron-based materials shorten the cycle life and hindered their application in SIBs. Herein, a general synthetic strategy of electrospinning process was developed to achieve the yolk-shelled Fe x Q y @C (Q = S, Se and P) film for binder-free anode of high-performance SIBs. Such method has more precursor materials to choose from and is highly scalable. More importantly, the designed electrodes have a unique yolk-shell structure and a three-dimensional conductive network. When applied as a binder-free anode of SIBs, all three samples exhibit outstanding sodium storage performance (FeS 2 @C-40: remaining 280 mAh g −1 after 400 cycles at 1 A g −1 , Fe 7 Se 8 @C-40: remaining 186.5 mAh g −1 after 200 cycles at 0.1 A g −1 and FeP 4 @C-40: remaining 205 mAh g −1 after 1000 cycles at 0.5 A g −1 ). Therefore, the scalability and universality of this general synthetic strategy can open up a new direction for the exploration of high-energy density and flexible electrode materials.
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Catalysts
·
2018
·Vol. 8
·期 7
·269
·
IF 3.465
Jing Liu,Yi-Gang Ji,Bin Qiao,Fengqi Zhao,Hongxu Gao,Pei Chen,Zhongwei An,Xinbing Chen,Yu Chen
Exploring inexpensive and highly efficient electrocatalyst to decrease the overpotential of oxygen reduction reaction (ORR) is one of the key issues for the commercialization of energy conversion and storage devices. Heteroatom-doped carbon materials have attracted increasing attention as promising electrocatalysts. Herein, we prepared a highly active electrocatalyst, nitrogen, sulfur co-doped carbon nanofibers (N/S-CNF), via in situ chemical oxidative polymerization of methylene blue on the bacterial cellulose nanofibers, followed by carbonization process. It was found that the type of nitrogen/sulfur source, methylene blue and poly(methylene blue), has significantly influence on the catalytic activity of the resultant carbon nanofibers. Benefiting from the porous structure and high surface area (729 m2/g) which favors mass transfer and exposing of active N and S atoms, the N/S-CNF displays high catalytic activity for the ORR in alkaline media with a half-wave potential of about 0.80 V, and better stability and stronger methanol tolerance than that of 20 wt % Pt/C, indicating great potential application in the field of alkaline fuel cell.Keywords:nitrogen sulfur co-doped carbon nanofibers;bacterial cellulose/poly(methylene blue) hybrids;oxygen reduction reaction;electrocatalyst
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Dongyuan Lei,Jinkui Li,Mingwu Xiang,Zirui Zhao,Shixun Yang,Zhe Hu,Mingwei Yuan,Junming Guo,Yi Xia,Wei Bai
Low sulfur content and inevitable polysulfide shuttle effect have always been the critical obstacle of the practical application of high-energy–density lithium sulfur batteries. Herein, a waste passiflora edulis peel derived in-situ N -doping porous carbon (PINPC) combined with three-dimensional hollow carbon cloth interlayer (3DHCI) was designed and constructed by facile simultaneous activation/carbonization. The abundant porous structure and nitrogen heteroatom doping of the PINPC not only significantly confine the soluble polysulfides through the physical and chemical adsorption, but also the high conductivity of the 3DHCI effectively accelerate the conversion reaction of polysulfides encapsulated in the unique hollow carbon skeletons. Owing to the synergetic enhancement of the PINPC and 3DHCI, the sulfur contents of the corresponding sulfur cathode composites are easily regulated from 70 wt% to 95 wt%, whilst exhibiting excellent electrochemical performances. The PINPC/S with a sulfur content of 70 wt% and 3DHCI interlayer obtains a high initial discharge capacity of 1032 mAh·g −1 and then retains 954 mAh·g −1 at 0.2 C after 200 cycles. At 2 C, a durable cycle life with capacity retention of 86% can be achieved up to 500 cycles. Even with an ultrahigh sulfur content of 95 wt%, the relatively high initial discharge capacity of 692 mAh·g −1 and capacity retention of 96 % are also achieved at 0.2 C after 200 cycles. This work offers a potential design for high-performance lithium sulfur batteries simultaneously with a high sulfur content.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Weiyan Jiang,Huizhong Shi,Miao Shen,Rui Tang,Zhongfeng Tang,Jian-Qiang Wang
The lack of suitable cathode materials with a high capacity and good stability is a crucial problem affecting the development of aqueous Zn-ion batteries. Herein, a novel strategy for the modification of V2CTx through molten salt thermal treatment is proposed. In the novel route, S heteroatoms were introduced into V2CTx through a substitution reaction during the dissolution of Li2S in LiCl–KCl molten salts. Then, surface V2O5 was obtained through the in situ electrochemical charging/discharging of the S-doped V2CTx (MS-S-V2CTx) cathode. The assembled Zn/MS-S-V2CTx battery showed a high reversible discharge capacity of 411.3 mAh g–1 at a current density of 0.5 A g–1, an 80% capacitance retention after long cycle stability tests at 10 A g–1 for 3000 cycles, and a high energy density of 375.5 Wh kg–1 in 2M ZnSO4. Density functional theory calculations demonstrate that the improved electrochemical performance of the cathode can be attributed to the introduced S heteroatoms, which considerably reduced the ion diffusion energy barrier for Zn2+ ions and improved the stability of V2O5. This work provides a novel method to produce highly active and stable vanadium-based cathodes for aqueous Zn-ion batteries.
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