Journal of Energy Storage
·
2024
·
IF 8.9
Juan Yang,Jiao Peng,Yi Tang,Peng Liu,Yu Lei,Junqing Zeng,Chaobai Yi,Yongqiang Shen,Liping Zheng,Xianyou Wang
The design of carbon electrode materials and electrolytes is distinct significance for improving the energy density of supercapacitors. Herein, N/S co-doped biomass porous carbon materials based on sustainable resource were prepared by in-situ expansion, heteroatom doping, and subsequent KOH activation strategy by using camellia seed shell as carbon source and ammonium persulfate as dopant and expander. The as-prepared N/S co-doped biomass porous carbon (N/S-CSAC-650) possesses the characteristics of high specific surface area, large pore volume, and suitable heteroatom content. The N/S-CSAC-650 electrode achieves a high specific capacitance of 335.9 F g −1 in the 3 M KOH electrolyte at 0.5 A g −1 . The constructed symmetric supercapacitor demonstrates excellent cyclic stability and shows a high retention rate of 98.4 % after 30,000 charge and discharge processes at 2 A g −1 . Especially, the energy density of supercapacitors is usually constrained by the narrow electrochemical stability window (ESW) of dilute aqueous solution (1.23 V), in order to effectively widen the ESW of water, herein the “water-in-salt” (WIS) electrolyte strategy is put forward and the ESW of water was extended to 2.94 V by using a 25 M KAc WIS electrolyte. The operating voltage window of the symmetric supercapacitor assembled by 25 M KAc WIS electrolyte and N/S-CSAC-650 electrodes can reach 2.0 V, and a high energy density of 48.86 Wh kg −1 is realized.
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高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2025
·
IF 13.5
Fanpeng Meng,Fei Zhao,Jingkai Lin,Jinsheng Zhao,Huayang Zhang,Shaobin Wang
Designing heterojunctions based on carbon nitride offers a promising pathway for enhancing photocatalytic efficiency. This study develops an all-organic S-scheme metal-free heterojunction uniquely composed of carbon nitride nanosheets (GCNNS) and a donor–acceptor conjugated polymer, poly p-aminobenzylidene-so-aniline (PASO), synthesized through a simple yet effective ball-milling technique. This heterojunction demonstrates excellent photocatalytic efficiency for hydrogen (H 2 ) evolution. The optimized GCNNS/PASO-10 sample attains an H 2 evolution rate of 10.12 mmol∙g −1 ∙h −1 , which is about 5.9 times and 19.5 times greater than those of pure GCNNS and PASO, respectively. This improvement is due to the unique interfacial bonding, increased visible-light absorption, and efficient charge carrier separation facilitated by a strong internal electric field within the S-scheme. Theoretical calculations and characterization reveal that this heterojunction’s S-scheme mechanism optimally aligns energy bands and promotes spatial charge separation, driving superior photocatalytic activity. This work presents the unique advantage of all-organic materials for heterojunction construction and provides insights into designing advanced S-scheme systems for sustainable energy conversion.
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高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Worku Lakew Kebede,Kuo Dong-Hau,Chen Xiaoyun
Metal oxide semiconductor photocatalysts have received remarkable consideration as a promising technology for environmental remediation and energy conversion. Oxysulfide semiconductors have narrow band gaps which are appropriate for photocatalytic removal of toxic organic pollutants under visible light illumination. For the elimination purpose of these pollutants, Mo(O,S) 2 , Mn(O,S) 2 , and Mn–Mo(O,S) 2 oxysulfide catalysts containing various Mn contents were synthesized at low temperatures via a simple method. The structural, morphological, electrochemical, compositional, and optical properties of the as-synthesized catalysts were exhaustively characterized. The photocatalytic degradation activity of the bares Mo(O,S) 2 , Mn(O,S) 2 , and other Mn–Mo(O,S) 2 compositions were evaluated over different types of organic pollutants under visible light illumination. The addition of Mn in Mo(O,S) 2 structure improved the photodegradation activity, and Mn–Mo(O,S) 2 -30 was found to be the best composition with superior photodegradation performance towards the four cationic, anionic, and neutral dyes. The degradation efficiency of 10 ppm of MB, and MO dyes reach 99.7 % and 98.6 %, within 30 and 120 min, respectively. Mn–Mo(O,S) 2 -30 catalyst also shows a good photodegradation performance on Rh B and NR organic pollutants. According to the recycling test, the catalyst exhibited excellent performance. The photodegradation follows pseudo-first order kinetics with a rate constant of 0.097 and 0.036 min −1 for MB and MO dyes, respectively. The trapping experiment showed that superoxide anion radicals (O 2 •- ) and holes (h + ) are the responsible active species for the degradation on MO and MB, respectively. The novelty of using Mn–Mo(O,S) 2 -30 for various dyes degradation lies in its remarkable catalytic properties.
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Xin Fan,Shan Gao,Qi Chen,Dayi Zhou,Lijie Chang,Yao Wang,Yuewen Zhang,Le Deng,Hongan Ma,Xiaopeng Jia
In recent years, skutterudite filled with electronegative elements (S, Se, Cl, Br) has attracted the extensive attention of researchers. By doping electron donors (Pb, Ni, or Te, S, Se) at the Co or Sb sites, the electronegative elements can form thermodynamically stable compounds in the intrinsic pores of the skutterudite, substantially expanding the research scope of skutterudite. In this study, S0.05Co4Sb11.3Te0.6Se0.1 skutterudite was synthesized at high pressure and high temperature, with a pressure range of 2.0–3.5 GPa. The phase composition, micro-morphology, and electrical and thermal transport properties were systematically characterized. The micromorphology analysis shows that the introduction of S element and substituting Te and Se at the Sb sites inhibit the grain growth in a suitable high-pressure environment. Substantial differences are observed in the directions of the lattice stripes in the samples, and rich grain boundaries and many lattice distortions and dislocation defects occur. The carrier concentration can be optimized by filling the voids of the skutterudite with a few S atoms, and the thermoelectric properties can be optimized by scattering phonons through resonance scattering and defect scattering. The samples synthesized at a pressure of 3.0 GPa and a temperature of 900 K have a maximum power factor of 23.85 × 10–4 W m–1 K–2 and a maximum zT value of 1.30 at a test temperature of 773 K.
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高影响因子
MATERIALS SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.7
Qingyu Cai,Shishun Ye,Haiyang Sun,Yalin Liao,Hui Chen
The heteroatom-doped graphene has attracted a lot of research due to its excellent physical, chemical and electrochemical properties considered to be the most promising electrocatalytic material for oxygen reduction reaction (ORR). Multi-doping can exert the synergistic effect between different doped heteroatoms and effectively improve the catalytic activity of doped graphene catalysts. N, P, S tri-doped graphene catalysts were prepared by simple and convenient hydrothermal and high-temperature treatment. The experimental results show that different phosphorus sources have a significant impact on the structure and performance of the prepared catalyst materials. The NSP-Gr-1 catalyst shows the high onset potential (1.035 V), half-wave potential (0.79 V) and limiting current density (−5.33 mA cm−2) for ORR. The power density of the zinc-air battery assembled with the NSP-Gr-1 catalyst achieves 163.1 mW cm−2 at 186.7 mA cm−2, which is much higher than the maximum power density of 140.0 mW cm−2 at 190 mA cm−2 for commercial Pt/C. The discharge stability under different current densities is outstanding.
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Xinwen Liu,Bingchu Mei,Guolong Tan
Given the downsizing and high integration of laser diodes in recent decades, Yb: Sr 5 (PO 4 ) 3 F (S-FAP) crystal materials are predicted to be employed as an all-solid laser medium to produce more energy for inertial nuclear fusion. The effects of various sintering conditions on the microstructure evolution and properties of 2 at. % Yb: S-FAP transparent ceramics by hot pressing sintering were systematically investigated in this work, which including sintering temperature , sintering pressure, heating rate, and holding time. When other sintering variables are held constant, the results reveal that a sintering temperature of up to 1050 °C results in visible grain development, substantial optical scattering, and even a significant carburizing impact at 1100 °C. Excessive sintering dwell time will result in grain development, and a high sintering holding time will result in the emergence of intergranular pores, lowering the optical quality of ceramics. The optimal heating rate range for as-synthesized ceramic is found to be 5–15 °C/min. Moreover, the grain development process of Yb: S-FAP transparent ceramics is determined to be grain boundary diffusion, with an activation energy of 239.4 kJ/mol during hot pressing sintering. Meanwhile, the as-prepared sample has excellent mechanical properties such as Vickers hardness of 7.47 ± 0.045 GPa, which are highly competitive when compared to other Yb-doped optical ceramic media such as Y 2 O 3 , YAG, Lu 2 O 3 , and so on. Finally, the transmittance was interpreted based on the microstructures of the as-synthesized ceramic samples and the Rayleigh-Gans-Debye scattering theory.
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高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 23
·4737-4744
·
IF 4.154
Binren Fang,Xiaolu Tian,Te Wang,Tao Wang,Long Qu,Mingtao Li
Graphical Polysulfide anchor : A high-entropy metal nitride (HEMN) was prepared as an innovative anchor to restrain lithium polysulfides via the chemical bonding interaction. The composite of HEMN and sulfur was encased by graphene to reduce the interface resistance. The absorptivity of HEMN and the high conductivity of graphene improves the capacity and cycle stability concurrently because of their synergistic effect. Lithium−sulfur (Li−S) batteries with ultrahigh theoretical specific capacity (1675 mAh g −1 ) have become a research hotpot, which focuses on the solution of shuttle effect of soluble lithium polysulfides (LIPS). Chemical immobilization of LIPS and encapsulation structure of the sulfur cathode are effective strategies to suppress the shuttle effect. Herein, high entropy metal nitride (HEMN) was prepared by mechanochemical-assisted synthesis as an innovative anchor to restrain LIPS via the chemical bonding interaction between HEMN and LIPS. Furthermore, the composite of HEMN and S was encased by graphene (GR) through electrostatic attraction caused by opposite zeta potential, thus as the effective cathode (HEMN/S@GR) of Li−S batteries. HEMN has plentiful active metal sites which can chemically adsorb LIPS, enhancing the cycle life of Li−S batteries. Graphene can accelerate surface charge transfer of sulfur cathode to reduce the interface resistance because of its high conductivity. The initial specific capacity of HEMN/S@GR cathode is 1193 mAh g −1 and still maintains 695 mAh g −1 after 100 cycles at 0.1 C. When increased to 1.0 C, the initial specific capacity is 556 mAh g −1 and exhibits remarkable stability in long cycles. This study presents the synergetic effect of HEMN and graphene on LIPS in Li−S batteries, which introduces a new application way of high entropy materials in the field of energy storage devices.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Yongxia Zhang,Yunfeng Qiu,Yanping Wang,Bing Li,Yuanyuan Zhang,Zhuo Ma,Shaoqin Liu
Electrochemical water splitting into hydrogen is a promising strategy for hydrogen production powered by solar energy. However, the cell voltage of an electrolyzer is still too high for practical application, which is mainly limited by the sluggish oxygen evolution reaction process. To this end, hybrid water electrolyzers have drawn tremendous attention. Herein, coaxial Ni/Ni3S2@N-doped nanofibers are directly grown on nickel foam (NF), which is highly active for hydrogen evolution reaction. Meanwhile, the Ni3S2@N-doped nanofibers on NF prepared in an Ar atmosphere display superior urea oxidation reaction performance to previously reported catalysts. The cell voltage is about 1.50 V in urea electrolysis to deliver a current density of 20 mA cm–2, lower than that of a traditional water electrolyzer (1.82 V). The current density is around 77% relative to its initial value of 20 mA cm–2 after 20 h, superior to Pt/C|Ir/C-based urea electrolysis (14%). It is found that the synergistic effect between metallic Ni and Ni3S2, as well as the interfacial effect between metal centers and N-doped carbon, favors the initial dissociation of H2O and the adsorption/desorption of H* with thermal neutral Gibbs free energy. Meanwhile, the in-situ generated NiOOH on the outer surface of Ni3S2 possessed lower electrochemical activation energy for urea decomposition. Meanwhile, the abundant oxygen vacancies in electrodes could expose more active sites for the adsorption of intermediates, including H* and OOH*. It is also found that the hierarchical nanostructure of densely packed nanowires provides ideal electronic and ionic transport paths for fast electrocatalytic kinetics. The present work indicated that the modulation of compositions and hierarchical nanostructure is effective to prepare efficient catalysts for H2 production via urea electrolysis.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Guoqiang Zhang,Jianqing Li,Zhiqi Wang,Xi Xu,Tao He,Jingli Wu,Jinhu Wu
The cocatalysts play a key role in photocatalytic technology in remarkably improving the efficiency of H 2 evolution. Herein, S vacancies-rich Cd 0.6 Zn 0.4 S nanorods (CZS NRs) were prepared via solvothermal method. Then, as-obtained CZS NRs were modified with Ni–Co PBA-derived NiS x nanoparticles (NPs) cocatalyst using grinding method. The optimized CZS/NiS x -N-1.5 hybrids (CZS/NiS x -N, where N represents nickel nitrate which was used as nickel source) exhibited outstanding stability and activity, the average rate of H 2 was up to 192.82 mmolg −1 h −1 in deionized water medium, which was 201.4% higher than that of CZS. Besides, NiS x -A and NiS x -C cocatalysts with different particle sizes were obtained using nickel acetate (A) and nickel chloride (C) as nickel source, respectively. The CZS/NiS x -C-1.5 and CZS/NiS x -A-1.5 exhibited the H 2 evolution rate of 180.70 and 201.93 mmolg −1 h −1 in deionized water medium, respectively. The as-prepared materials also exhibited the excellent H 2 evolution performance in natural seawater medium. Besides, the photocatalytic mechanism of H 2 evolution over CZS NRs/NiSs NPs was also discussed. This work develops a novel H 2 evolution cocatalyst and unveils the relationship between the loading amount/particle size of cocatalyst on the H 2 evolution rate.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 29
·期 1
·1-11
·
IF 3.097
Li Kaiqi,Chen Long,Xiong Zuochun,Xiong Chengdong,Chen Dongliang
Amino-functionalized six-membered cyclic carbonate tert-butyl(2-oxo-1,3-dioxan-5-yl) carbamate (TBC) was synthesized with tert-Butyloxycarbonyl (Boc) as protected group. Due to its thermal properties, ring-opening polymerization (ROP) carried out in a relatively low temperature, and Sn (Oct) 2 as catalyst. A series of copolymers were prepared with L-lactide (LA), ε-Caprolactone (CL) as co-monomers, searching for proper components and ratios. The protecting Boc-group was easy to remove by using trifluoroacetic acid (TFA). The structures of TBC and copolymers were confirmed by 1 H NMR and 13 C NMR analysis. Copolymers were characterized by DSC, GPC and water contact angle analysis. The introduction of pendant amino groups resulted in a significant enhancement of hydrophilicity of the copolymers.
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高影响因子
Green Chemical Engineering
·
2021
·
IF 0
Xin Wang,Hao Hu,Bihua Chen,Lulu Dang,Guohua Gao
The synthesis of dimethyl carbonate (DMC) via transesterification of ethylene carbonate (EC) and methanol (MeOH) was an environmental and practical strategy. Herein, poly(ionic liquid)s (PILs) with swelling abilities were synthesized by free radical copolymerization of N -vinylimidazolium ionic liquids, sodium 4-vinylbenzoate and cross-linker 1,8-triethylene glycoldiyl-3,3ʹ-divinylimidazolium bromide ([(EG) 3 -DVIm]Br 2 ). The swelling abilities of PILs in various solvents were measured, and PILs could swell in methanol (MeOH). The swelling ability of PILs in MeOH could be modulated by changing the cross-linker content and chain length of 3-alkyl-substituents on imidazolium. The swollen state of PILs in MeOH presented a porous cross-linked network structure observed by the cryo-scanning electron microscope (cryo-SEM). The swelling PILs were used to catalyze the transesterification of ethylene carbonate (EC) and MeOH to prepare the DMC, and the catalytic activities was correlated with the swelling abilities of PILs. The PIL with 3-butyl-substituent and 2.5 mol% cross-linker (poly[VBIm-VBA-DVIm]-2.5%) had the highest swelling ratio ( Q = 12.4 (g/g)) in MeOH and EC mixed solvents and exhibited excellent catalytic activities, which was similar to corresponding homogeneous ionic liquid. Furthermore, the catalyst could be reused up to seven runs without any considerable loss of its initial activity.
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DOI
Catalysts
·
2021
·Vol. 11
·期 12
·1550
·
IF 4.146
Hongzhou Dong,Yingjie Chen,Chong Gong,Lina Sui,Qiong Sun,Kangle Lv,Lifeng Dong
Due to slow kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) during discharging and charging processes, it is essential to rationally design and synthesize non-precious metal bifunctional electrocatalysts with good performance for metal-air batteries. Herein, Ag-MnFe2O4heterojunction nanoparticles supported on N, S, P-codoped graphene (NSPG) are developed with enhanced ORR and OER bifunctional electrocatalytic activities and stability. In contrast, S, P-doped graphene (SPG) and N, P-doped graphene (NPG) show less stabilization for the heterojunction particles. For example, under alkaline conditions, the ORR half-wave potential of Ag-MnFe2O4/NSPG can reach 0.831 V, and the over potential for OER is 0.56 V at the current density 10 mA·cm−2. Furthermore, Ag-MnFe2O4/NSPG shows better methanol resistance and durability than Pt/C catalysts.
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高影响因子
危险品化学品经营许可证（带存储）