Materials Today Energy
·
2022
·
IF 9.257
Quan Zhou,Yue Yang,Qitong Ye,Tong Xue,Mudong Tu,Yipu Liu,Hua Li,Xiang-Hui Yan,Zhong-Li Zou,Bei-Ping Wang,You-Jun Lu,Feng-Lan Han
Combining catalytic active materials with nitrogen-doped carbon structure has been an effective strategy for designing high-performance electrocatalysts , where N species plays a vital role in modulating the electronic structure of composite material. The N dopant in the carbon structure exists in different states, but it has been ambiguous which type of N structure contributes the most to the overall catalytic activity. Here, Fe 3 C nanoparticles embedded in graphitic nitrogen-dominated carbon framework (Fe 3 C@NC) has been successfully fabricated from Fe@ZIF-8 and exhibits excellent oxygen reduction reaction (ORR) activity and stability. Experiments and theoretical calculations confirm the interaction between Fe 3 C and N-doped carbon. Moreover, graphitic nitrogen is proved to exhibit the highest promotion contribution among different N states, which can effectively reduce the energy barrier of the potential determining step (from O 2 to ∗OOH) for ORR. The Fe 3 C@NC composite is applied as the air cathode in a Zn-air battery, which shows a high E OCV (open-circuit voltage) of 1.48 V, a power density of 155.6 mW/cm 2 , and a specific capacity of 798 mAh/g Zn . This work suggests the synergy of Fe 3 C, N species, and carbon layer in promoting the performance of ORR catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2025
·
IF 9.8
Chuanyin Xiong,Xing Fan,Qing Xiong,Yongkang Zhang,Yadong Su
Phase change materials, as ideal materials for efficient utilization of thermal energy, have always been highly regarded. However, their widespread application is hindered by the difficulty of preservation during thermal energy storage. The use of packaging materials to realize the reasonable storage of phase change materials has always been the focus of researchers' attention. However, because the packaging materials are not environmentally friendly and the production process is cumbersome, which restricts their development. Therefore, this study starts from the packaging materials themselves, uses wood widely existing in nature as the source of packaging materials, skillfully uses the three-dimensional framework of the wood itself to increase its internal pore structure by removing lignin, and uses the hydrogen bonding force of internal pores and capillary force of pores after wood delignification to add thermal conductive particles CNT to the wood gas gel skeleton and carbonize to increase the thermal conductivity of the packaging materials themselves. After carbonization, air plasma treatment obtains the wood gas gel carbon skeleton with free hydroxyl groups on its surface and phase changes. The force to form hydrogen bonds between hydroxyl groups contained in PEG Makes the surface bonding tighter, reduces the diffuse reflection of light, and increases the photothermal conversion efficiency of composite phase change materials. The thermal conductivity of the obtained composite phase change material is 2.12 times higher than that of pure PEG. The maximum packaging rate of the wooden aerogel carbon skeleton as the packaging material is 96 %. The highest photothermal conversion efficiency can reach 86 % through the solar light simulation device and has a reliable photothermal conversion efficiency after multiple cycles.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Zhangxinyu Zhou,Yaoqi Huang,Qiang Shen,Yuanyuan Li,Xiaomin Cheng
The significant importance of developing phase change materials (PCMs) lies in their capability to meet diverse usage needs, particularly in the sphere of solar energy utilization. In this work, a thermal storage substrate was formed by adsorbing stearic acid in a biocarbon skeleton via vacuum impregnation. A composite PCM with multifunctional properties was subsequently synthesized by modifying the carbon mesh with copper sulfide (CuS) and zinc oxide (ZnO), compounding it onto the surface of the heat storage substrate. The biocarbon skeleton possesses a well-graded pore structure , which offers a significant number of channels for efficient heat transfer and effective electromagnetic shielding . The composite PCM retained a latent heat exceeding 155 J·g −1 . The integration of the biocarbon skeleton and modified carbon mesh led to a remarkable 119.42 % enhancement in thermal conductivity within the composite system , as compared to pure stearic acid. Furthermore, granular ZnO and nanoflower-like CuS are effectively integrated on the surface of the carbon mesh, facilitating the formation of localized surface heterojunctions . The composite system exhibits excellent broad-spectrum light absorption capability, producing a significantly elevated photothermal conversion efficiency of 88.93 %. Moreover, the semiconductor effect contributes to a remarkable degradation efficiency of 99.33 % for methylene blue . Significantly, the composite material demonstrates exceptional electromagnetic shielding capability, yielding a total shielding effectiveness exceeding 40 dB. The composite system also demonstrated outstanding thermal and cycling stability, with a negligible latent heat loss of merely 1.9 % even after undergoing 500 thermal cycles. This work proposes a pragmatic methodology to accomplish the functional integration of PCMs.
研究领域:
能源材料
·
环境科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Xiangdong Guo,Jiarui Li,Yizhi Yuan,Chunyu Cui,Jian Zhu
Extensive research has been conducted on high-capacity anodes as potential replacements for graphite in lithium-ion batteries driven by the desire to achieve higher energy density. Among them, transition metal selenides have attracted much attention but suffer from poor structural stability due to the large volume expansion after Li+ insertion. In this work, we first encapsulate Fe7Se8 nanoparticles in a carbon skeleton (Fe7Se8/C) and then coat Fe7Se8/C with N-doped carbon (NC) to form a core–shell structure with a void gap created between the Fe7Se8/C core and NC shell (Fe7Se8/C-NC). The carbon skeleton alleviates the volume expansion of Fe7Se8 nanoparticles and increases the electronic conductivity, while the NC coating layer maintains the structural integrity of Fe7Se8/C and improves the electrolyte penetration. Because of this special nanostructure, the Fe7Se8/C-NC electrode shows ultrahigh capacities of 1176, 749.3, and 692.4 mAh g–1 at current densities of 0.1, 1, and 2 A g–1 and maintains high capacities of 457.8 and 324.5 mAh g–1 after 300 and 800 cycles at 2 A g–1, respectively. This multilevel protection strategy makes Fe7Se8 a promising candidate for next generation anodes and provides inspiration for the design of other anodes.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 9
·094002
·
IF 3.399
Desheng Li,Yu Zhang,Kun Rui,Huijuan Lin,Yan Yan,Xiaoshan Wang,Chao Zhang,Xiao Huang,Jixin Zhu,Wei Huang
Nanostructured manganese oxides have been regarded as promising anodes for lithium-ion batteries (LIBs) due to their high specific capacity, environmental friendliness and low cost. However, as conversion-type electrodes, their scalable utilization is hindered by intrinsically low reaction kinetics, large volume variation and high polarization. Herein, a coaxial-cable tubular heterostructure composed of a hollow carbon skeleton, Fe3O4 nanoparticles and ultrathin MnO2 nanosheets from inside out, donated as MnO2@Fe3O4@C, is synthesized via a facile two-step hydrothermal process. The unique design integrates conductive carbon and nanostructured MnO2 and Fe3O4 into a one-dimensional (1D) hierarchically open architecture, which provides abundant electrode–electrolyte contact areas, favorable heterointerfaces and ultrafast electron/ion pathways. Benefiting from these features, the MnO2@Fe3O4@C anode exhibits a high reversible capacity of 946 mAh g−1 at 200 mA g−1 after 160 cycles, and excellent cyclability with a specific capacity of 845 mAh g−1 at 500 mA g−1 after 600 cycles. This work might provide an insightful guideline for the design of novel electrode materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ULTRASONICS SONOCHEMISTRY
·
2022
·
IF 9.336
Ruyue Zhang,Yilong Zhang,Yating Sun,Hang Yu,Fangwei Yang,Yahui Guo,Yunfei Xie,Weirong Yao
This study evaluated how the generation of pyrazines was promoted by high-intensity ultrasound (HIU) in a Maillard reaction (MR) model system of glucose-glycine. Carbohydrate module labeling (CAMOLA) technique was adopted using D-glucose- 13 C 6 to elucidate the carbon skeleton of both intermediate and final MR products (MRPs). In the D-glucose- 13 C 6 -glycine HIU-MR model system, the concentration of 11 types of pyrazines was significantly higher than their counterparts in the thermal MR. Results of CAMOLA analysis showed that a significantly lower proportion of [M] + in pyrazines with long-length side chains was observed when compared with the pyrazines generated in thermal MR. This phenomenon may suggest the aldol-type condensation was promoted by the HIU, which is a conversion from pyrazines with short-length side chains to those with long-length side chains involving carbonyl compounds. Furthermore, the analysis of isotopomers distribution in 2,3-dimethyl-quinoxaline as the o-phenylenediamine-derivatized 2,3-butanedione indicated that the increased proportion of [M + 4] + in 2,3-dimethyl-quinoxaline (15.74% ± 0.11%) was attributed to a cleavage of D-glucose- 13 C 6 promoted by the HIU. The above-mentioned findings elucidate that the aldol-type condensation and cleavage of D-glucose contribute to the promoted synthesis of pyrazines. The HIU would generate an extremely high temperature and pressure environment that is favored by the aldol-type condensation as a high-pressure favored reaction. The HIU, therefore, can be further developed as a promising technique to promote flavor generation through the MR.
研究领域:
食品科学
·
有机化学
✓ 已验证
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Jiayu Hao,Yanqiu Wang,Kuang Sheng,Zhongliang Tian,Yang Liu,Wenzhang Li,Jie Li
The development of new regulation strategy for constructing functional carbon skeletons is a standing challenge for oxygen reduction reaction (ORR). Herein, the locally ordered graphene microcrystals with suitable N -sites derived from glucose are synthesized under the assistance of low melting point zinc molten salt . Utilizing the structural features of graphene microcrystals (“house of cards” model), the work function of carbon skeleton is reduced after inducing the conversion of bridging sp 3 -C to bridging sp 2 -C (ratio of sp 2 -C to sp 3 -C increases from 3.75 to 7.41). The lower work function of locally ordered microarchitectures decreases the long-range electron transfer barrier in outer-Helmholtz plane. And the synergy between pyridinic N and graphitic N is beneficial for enhancing short-range electron transfer process in inner-Helmholtz plane. After rearrangement of carbon skeletons, the half-wave potential can increase from 0.846 V to 0.874 V, and the HO 2 – by-product yield decreases from 31.5 % to 6.9 %. Furthermore, the discharge voltage of locally ordered microarchitecture (1.31 V) at 10 mA cm −2 can surpass the commercial Pt/C (1.25 V) in Zn-air battery devices. In brief, it provides a new direction of structure design for carbonaceous catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Yong-Gang Zhao,Yu-Fei Sun,He-Gang Gao,Li-Hui Chen,Wei-Si Su,Chao Lei,Ming-Li Ye,Yin Lu
Carbon skeleton nano microspheres are regarded as a prospective adsorbent material for the removal of pollutants in water, largely due to their exceptional characteristics. In this study, different carbon skeleton microspheres were prepared using the acetonitrile precipitation method. The particle size of the microspheres was adjusted to between 80 and 100 nm by controlling the dosage of modified monomers during the reaction process and the acidity and alkalinity of the solution. The resulting material was a carboxylated nano carbon skeleton microsphere (NCS). Subsequently, the grafting of octadecylamine (C18) onto the NSC material resulted in the formation of nano carbon skeleton materials with superhydrophobic properties. The adsorption performance of the composite C18-NCS on toluene was investigated, and the effect of C18 dosage on the adsorption performance of C18-NCS was further examined. The findings revealed that the maximum adsorption of toluene by C18-NCS was 509.43 mg/g, and the adsorption process exhibited conformity to the Langmuir model and pseudo-second order kinetics. Furthermore, the adsorption behavior of the composites towards other benzenes (benzene, paraxylene) was also investigated. The thermodynamic studies demonstrated that the adsorption of benzenes on the composites was a spontaneous, heat-absorbing process. Ultimately, following three cycles, the composite exhibited a retention of over 80 % of its initial adsorption performance. In conclusion, the superhydrophobicity and thermal stabilization of C18-NCS render it an excellent and environmentally friendly adsorbent material for the efficient and rapid removal of benzene .
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 48
·24831-24840
·
IF 9.931
Ling Li,Qian Yang,Xue Lang Gao,Hong Yue Wu,Qiu Gen Zhang,Ai Mei Zhu,Qing Lin Liu
With the aim of preparing highly alkaline stable anion-exchange membranes (AEMs) with desirable ionic exchange capacity (IEC) and swelling, a series of crosslinked poly(4-vinylphenol) (PVP)-based membranes was prepared. A facile crosslinking method using bis(hydroxymethyl)-4-cresol (BHMC) as the crosslinker was introduced in the preparation of AEMs to avoid sacrificing specific functional groups such as –OH in the backbone. It is worth mentioning that the whole procedure for membrane preparation was efficient and easy to handle. The as-prepared membranes exhibited pretty low water uptake and swelling by the introduction of a crosslinked structure. Microphase separation to different extents could be observed in the membranes with different degrees of crosslinking via transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS). The QAPVP-5% membrane with an ionic exchange capacity (IEC) of 2.12 meq g−1 displayed the highest ionic conductivity of 78 mS cm−1 at 80 °C. Moreover, the all-carbon backbone endowed an excellent alkaline stability of the membranes, and the QAPVP-5% membrane still retained 91.3% of its original conductivity after immersing in a 2 M aqueous KOH solution at 80 °C for 480 h. A peak power density of 122 mW cm−2 was also obtained by a single cell equipped with the QAPVP-5% membrane.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Haoyu Liang,Huanping Wang,Pengcheng Zhang,Dongliang Ding,Yameng Jiao,Yijun Zhou,Qunxiang Xue,Qiang Song,Qiuyu Zhang,Yanhui Chen
Phase change materials (PCMs) with high energy density and stationary transition temperature are now considered promising solar energy storage mediums. However, their intrinsic poor light absorption , thermal conductivity and stability severely impede their potential applications. In this study, a novel carbonized hybrid aerogel (CHA) structure was firstly constructed by incorporating MXene and carbon nanofibers (CNFs) into a continuous phase polyamic acid salt (PAAS) aqueous solution, followed by directional freezing, vacuum drying, imidization, and carbonization processes . Finally, the composite PCMs (CPCMs) were fabricated by vacuum impregnation of PCMs into the CHAs. The CPCM, of which CHA consists of 20 wt% MXene and 10 wt% CNF@PDA, demonstrates high solar-thermal conversion efficiency (>91 %), improved thermal conductivity of 0.40 W·m −1 ·K −1 , great thermal stability (enthalpy loss < 0.19 % after 100 cycling tests with no obvious leakage). The introduction of MXene and CNFs endows PCM with broader light absorption spectrum range. The skeleton matrix embedded with bonded MXene sheets and CNFs provides more thermal pathways, light absorption sites and carrying capacity, improves the thermal conductivity , solar-thermal conversion property and stability of PCM. In addition, CPCM also exhibits outstanding EMI SE (95 dB). The multifunctional and high-performance CPCMs shows potential to realize the effective capture and utilization of solar energy. This work provides a new strategy to construct stable and multifunctional hybrid carbon skeleton for high-efficiency solar-thermal conversion and energy storage.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Mingzhu Zhu,Binhao Yu,Wenfang Cui,Yongmei Sun,Mei Ma
Carbon coating is a beneficial method for improving surface capacitive behavior, electron transfer kinetics and cyclic stability of three-dimensional lattice lithium-embedded anode materials. Herein, we adopt one-step pyrolysis to achieve carbon-covered TiP 2 O 7 supported by a three-dimensional carbon skeleton utilizing phytic acid and glucose as carbon sources. The two-dimensional amorphous carbon layer on TiP 2 O 7 surface improves the initial Coulombic efficiency and rate capacity by inhibiting the irreversible embedding of lithium ions and reducing the interfacial charge transfer impedance. The three-dimensional carbon skeleton not only forms a conductive pathway between the carbon-covered TiP 2 O 7 , but also its large specific surface area, randomly oriented and defective carbon layer provide extra lithium storage sites and capacitive contribution. In addition, the specific capacity of the TiP 2 O 7 /C composite is still as high as 314.5 mA h g −1 after 1000 cycles at 1 A g −1 . A TiP 2 O 7 /C//LiFePO 4 full cell delivers a high energy density of 273.96 Wh kg −1 at 0.153 kW kg −1 , and retains 114.43 Wh kg −1 even at the power density of 4.086 kW kg −1 . The multi-dimensional carbon modification strategy has improved the electrochemical performance of TiP 2 O 7 -based anode materials, providing a model for synthesizing other high-performance anode materials.
研究领域:
材料科学
·
能源化学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Wei Jiang,Xiaoyuan Wang,YunJiao Ma,Ming Du,Chao Wu,Xianbing Xu
Maillard flavor compounds, such as 2,3,5-trimethylpyrazine, have been frequently identified in thermally processed food products, such as popcorn and peanuts. However, the origin of the carbon atoms in 2,3,5-trimethylpyrazine has not been clearly elucidated. Herein, a model reaction showed that precursor methylglyoxal and intermediates glyoxal and formaldehyde contributed to the formation of 2,3,5-trimethylpyrazine via a conversion reaction between methylglyoxal and glyoxal. In addition, carbon module labeling technology and model response validation experiments indicated that this transformation reaction between methylglyoxal and glyoxal brought formaldehyde into the methyl group carbon atoms of the 2,3,5-trimethylpyrazine ring. The proposed novel route provides a new perspective for approaches to control the formation of flavor compounds, such as 2,3,5-trimethylpyrazine.
研究领域:
食品科学
·
有机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）