CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ying Liu,Yubo Zhao,Changtu Ma,Min Zhao,Huayun Du,Yang Ge,Jianlong Ji,Kexun Li,Yanxia Wu
Ti 3 C 2 T x MXene has been regarded as a promising candidate for advanced microwave absorption materials. However, the microwave absorbing performance of Ti 3 C 2 T x MXene is suppressed by the single dielectric loss mechanism and impedance mismatch because of the high conductivity. To effectuate a good absorption capability of Ti 3 C 2 T x MXene, this paper constructs a heterostructured Co/Ti 3 C 2 T x hybrid by atomic layer deposition of magnetic Co nanoparticles on Ti 3 C 2 T x nanosheets . The microstructures, magnetism , and microwave absorption behaviors of the Co/Ti 3 C 2 T x hybrids are investigated systematically. The results show that the frequency-dependent electromagnetic parameters of the Ti 3 C 2 T x MXene become tunable by controlling the content of Co decorations, which are conducive to both magnetic loss and impedance matching . The Co/Ti 3 C 2 T x hybrid with ultralow Co decoration content (only 1.52 wt%) achieves the minimum reflect loss of −54.32 dB at a thin matched thickness of 1.29 mm, and the corresponding effective absorption bandwidth with reflection loss below −10 dB reaches 4.29 GHz. The atomic layer deposited magnetic metal nanostructures provides an effective strategy for preparing MXene-based hybrids which not only have high absorption efficiency but also significantly reduce the use of magnetic metals.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Yongzhi Xiong,Wei Zhao,Changzhou Chen,Mengyuan Qiu,Yingrui Dong,Yajun Liu,Jianchun Jiang,Mengmeng Fan,Kui Wang
In this study, a novel Co-modified MoS 2 loaded spherical biochar (Co-MoS 2 @BC) derived from renewable biomass was synthesized as an efficient anodic HMFOR electrocatalyst. In the HMFOR process, the Co-MoS 2 @BC required a potential of only 1.426 V for the current density of 100 mA/cm 2 , significantly outperforming that of the MoS 2 loaded on spherical biochar (MoS 2 @BC) and the Co nanoparticles loaded on spherical biochar (Co@BC). Furthermore, the HMF conversion ratio reached 99.6 %, FDCA selectivity was 99.7 %, and Faradaic efficiency was 99.3 %. The Mechanistic studies reveal that the modified-Co on the MoS 2 modulated the electronic structure of Co-MoS 2 @BC, which not only enhanced the interaction between Co-MoS 2 @BC and the electrolyte, thereby facilitating the evolution of the catalysts toward highly active species, but also improved the adsorption of HMF and the H + transfer e - coupling step during the HMFOR process.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Defu Yin,Renjie Ji,Fanglin Lv,Long Jiang,Jingyun Zhang,Mingya Liu,Zhen Jia,Shitao Yu,Ruiyang Zhao,Yue Liu
Efficient catalysts are still the key to practical industrial applications. In this work, Pd-based catalyst was modified by doping metal Co to obtain Pd-Co@mSiO 2 bimetallic core–shell catalyst. The modified bimetallic core–shell catalyst was used in the hydrogenation of phenol, and the catalytic results showed that the Co modification effectively improved the catalytic performance of the Pd-based catalyst, especially, it reduced the activation energy of the reaction and greatly improve the conversion of phenol. Combined with characterization, it was found that Co doping reduced the particle size of Pd metal particles and affected the adsorption capacity of substrate phenol on the surface of Pd metal. The conversion of phenol was close to 99.9 % within 1 h at 80 °C, while the selectivity of cyclohexanone reached 95.4 %. In addition, the core–shell structure provided a stable environment for the catalyst, which still maintained high activity after being recycled for 5 times.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Siyue He,Ningxuan Xue,Guanjie Lin,Yiyang Chen,Xinyu Gai,Yalin Yu,Fengling Liu,Zhaobing Guo,Pengxiang Qiu
Nowadays, organic contaminants have posed a considerable threat to the natural environment. Ferrate (Fe (VI)) is an environmentally friendly oxidant for decomposing organic contaminants in water. In this study, Co modified N-doped carbon nanosheets were prepared to enhance phenol degradation by Fe (VI) under alkaline conditions. Also, the properties, mechanism and transformation pathways were investigated. Co/NC-1000 significantly accelerated Fe(VI) activation, resulting in phenol degradation to be 1.5–4 times faster than with Fe(VI) alone, achieving 92 % removal within 75 seconds. Also, •OH is the essential active oxidizing species for the degradation of phenol in the Fe (VI)-Co/NC-1000 group, followed by 1 O 2 and Fe(V)/Fe(IV). Moreover, the catalyst remained stable over five cycles, making the Fe(VI)-Co/NC system a promising method for efficient water treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2020
·
IF 4.302
Qiangwei Li,Yuguo Wang,Lei Xing,Tieyue Qi,Lin Zhang,Jie Liu,Shihan Zhang,Yongliang Ma,Lidong Wang
Accelerating the (NH 4 ) 2 SO 3 oxidation gives rise to the reclaiming of byproduct, while there are secondary environmental risks from reduction of the coexisted selenium species by sulfite . In this study, a bi-functional Co-SBA-15-SH, were synthesized through Co impregnation and sulfhydryl (-SH) decoration, which can simultaneously uptake Se and accelerate sulfite oxidation efficiently. Meanwhile, the adsorption kinetics and migration mechanism of Se species were revealed through characterization and density functional calculations, with maximum adsorption capacity of 223 mg/g. The inhibition of Se 0 re-emission and poisonous effect of Se on sulfite oxidation was also investigated. Using the findings of this study, the ammonia desulfurization can be improved by enabling purification of the byproduct and lowering the toxicity of effluent by removing toxic pollutants .
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemCatChem
·
2021
·Vol. 14
·期 1
·e202101311
·
IF 5.686
Hang Yu,Ximeng Zhao,Feichao Wu,Yuhong Luo,Aizhong Jia,Yanji Wang,Jingde Li
Graphical Electrocatalysis : This work is about the development of the 3DOM Co/NPC@TiO 2-x ORR electrocatalyst. The unique TiO 2-x -based 3DOM structure and the synergistic between N, P co-doping and Co-decoration contribute to improve the ORR catalytic activity and stability. The proposed electrocatalyst exhibits an outstanding half-wave potential of 0.86 V in alkaline electrolyte. The resulting primary and flexible zinc-air batteries also deliver considerable performance. Developing efficient and durable electrocatalysts of oxygen reduction reaction (ORR) is critical for high-performance air cathodes. Herein, a novel three-dimensionally ordered macroporous oxygen-deficient TiO 2 framework embedded with N, P and Co-tridoped carbon (3DOM Co/NPC@TiO 2-x ) is elaborately designed for ORR. This unique structure offers a high surface area, good mass transfer, excellent electronic conductivity, and stability. Moreover, the experimental and theoretical studies reveal that the synergistic effect of N, P co-doping and Co-decoration is indispensable to promote the ORR performance, yielding high O 2 adsorption energy and lowering the reaction barriers simultaneously. Accordingly, the ORR catalytic activity and stability of the proposed electrocatalyst are better than Pt/C in alkaline media. The resulting primary zinc-air battery delivers a high open-circuit voltage (1.50 V) and specific capacity (820 Wh kg −1 ) at 20 mA cm −2 . This strategy, combining macroporous oxygen-deficient oxide support with binary heteroatom doping, provides a new perspective for exploiting efficacious ORR electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Energy & Environmental Materials
·
2022
·Vol. 6
·期 5
·e12418
·
IF 13.443
Xiaobing Bao,Yuzhuo Chen,Shanjun Mao,Yong Wang,Yong Yang,Yutong Gong
The surface properties of catalysts determine the intrinsic activity and adaptability. Ruthenium is regarded as a potential candidate to substitute platinum for water electrolysis due to the low cost and analogous electronic structures while it suffers from severe dissolution and stability problems. Herein, the modification of Ru/C with atomically dispersed cobalt atoms is achieved via a simple thermal doping method. The newly formed amorphous shell with Ru-Co sites on the Ru/C catalyst improved the hydrogen evolution reaction activity and stability significantly. Impressively, the obtained Co 1 Ru@Ru/CN x catalyst exhibited an overpotential as low as 30 mV at 10 mA cm −2 in an alkaline medium, which is among the best HER catalysts reported so far. The oxygen oxophile Co prevents the fast oxidation and dissolution of Ru species, ensuring outstanding long-term durability up to 70 h. Theoretical calculations reveal that the Ru-Co coordination acts as a more active site for water dissociation than the Ru-Ru. Meanwhile, the “Ru-Co shell/Ru core” structures show high adaptability for the reaction conditions. This simple doping strategy offers prospects for scalable preparation of highly active electrocatalysts.
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 THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 8
·087514
·
IF 4.386
Xun Zou,Yuying Chen,Xiangfei Song,Mingyan Sun,Zhiyuan Zheng,Peiru Lin,Jia Tao,Peng Zhao
The sensitive detection of dopamine (DA), especially the accurate monitoring of cell secreted DA, is necessary to the study on pathogenesis of central nervous system disease. In this paper, the cobalt-modified nitrogen doping carbon aerogels (Co-NCA) with three dimensional pores were successfully synthesized through the hydrothermal and freeze-drying method of the biomass. As a natural substance, starch is the carbon source of Co-NCA, which is environmentally friendly. The electrochemically active area of electrode modified by Co-NCA was about 1.53 times that of carbon aerogels. Benefiting from the Co and N element, the Co-NCA modified electrode (Co-NCA/GCE) showed that Co-NCA had a wider linear range (0.2–200 μM and 200–1000 μM) and a lower detection limit (55.6 nM) towards DA. The reproducibility and repeatability of Co-NCA/GCE for detecting 500 μM DA was 2.21% and 0.797%, respectively. After stored at 4 °C for 7 days, the current response of Co-NCA/GCE still maintained 96.5% of the initial current value. Finally, the Co-NCA/GCE was successfully applied to the monitoring of DA, which was released from PC12 cells after stimulated by 50 mM K+.
研究领域:
生物医学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Aoji Liang,Tianyu Hou,Hui Peng,Xuan Xie,Wenjuan Li,Shuzhen Cui,Wenbin Li,Guofu Ma
Oxygen reduction reaction (ORR) electrocatalysts have the advantages of high activity, high durability and inexpensive, which are promising for promoting the mass commercialization of renewable fuel cells and metal-air batteries. Uniform N and S co-doping can enhance the integral activity and conductivity of catalysts has been shown to be important in ORR electrocatalysis. In this study, cobalt-modified N, S co-doped carbon nanofibers (Co-NSC-R) were successfully synthesized by using ZIF-8 as a template-assisted pyrolysis. The N, S co-doped carbon matrix firmly anchored the Co-N x sites on the entangled carbon fibers, which efficiently regulated the electronic structure of the Co-N x -C sites and greatly ensured their oxygen electrocatalytic activity. In addition, the half-wave potential of the Co-NSC-R catalyst reaches 0.861 V and has superior resistance to methanol intoxication and cycling stability. The assembled zinc-air batteries (ZABs) have a maximum power density of 73.1 mW cm −2 , a high specific capacity of 752.7 mAh g −1 and a long-term durability of 94 h. This work provides ideas for the application of metal-modified heteroatom-doped porous carbon nanofibers as excellent 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
Progress in Natural Science-Materials International
·
2025
·
IF 7.1
Jie Li,Zhangyue Zheng,Yuehong Huang,Liu He,Hongying Guo,Chunzheng Wu,Wei Liu,Weiwei Huan
The serious problems caused by water contamination call for efficient treatment. The catalytic reduction of 4-nitrophenol (4-NP) by NaBH 4 in solution is a convenient way to convert 4-NP to 4-aminophenol (4-AP), which is a precious intermediate for manufacturing of important materials such as pharmaceuticals. In the present study, the Co modified MoS 2 supported Au nanoparticles (Au/Co-MoS 2 ) is proved to be an efficient catalyst for the reduction of 4-NP. With the introduction of cobalt, the catalytic activity is improved obviously compared to Au/MoS 2 . When Co:Mo is 2:8 (mol), the Au/CoMoS 2 (2/8) catalyst exhibits the highest activity. The kinetics of the catalytic reactions were studied by the plot of ln(C t /C 0 ) against reaction time and the k app for Au/CoMoS 2 (2/8) is 1.063 min −1 . The characterization of the catalysts shows that the addition of cobalt can create more crystal defects, promote the exposure of active edge sites, facilitate the surface of catalysts to be more reactive.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Rong Luo,Ruixiang Li,Chunli Jiang,Ruijuan Qi,Mengqin Liu,Chunhua Luo,Hechun Lin,Rong Huang,Hui Peng
2D transition metal carbides , nitrides and carbonitrides , namely the MXenes, attract more and more attentions due to their unique properties. Here, we report a simple one-step molten salt etching method to prepare Co modified MXene hybrid (Ti 3 C 2 T x :Co) by the reaction of Ti 3 AlC 2 with Lewis acid CoCl 2 at 750 °C. Most of Co atoms aggregates in the interlayered space of Ti 3 C 2 T x . Benefitting from the improved electron charge transfer efficiency and increased active sites, the sulfuric acid treated Ti 3 C 2 T x :Co-12h hybrid exhibits excellent electrocatalytical activity for hydrogen evolution reaction in alkaline media , delivering a current density of 10 mA cm −2 at an overpotential of 103.6 mV, which is lower than most noble metal free MXene based electrocatalysts . The results illustrate that the proposed method is very facile and useful to incorporate mid-to-late transition metals into the MXene phase to prepare MXene based HER electrocatalysts .
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Processes
·
2024
·Vol. 12
·期 8
·1596
·
IF 2.8
Lei Hu,Lin Shi,Edwin Hena Dawolo,Ning Ding,Hong Liu
A cobalt-loaded magnetic biochar (Co-MBC) catalyst was synthesized to enhance the removal of metronidazole (MNZ). Study explored the performance and mechanism of MNZ degradation by Co-MBC activated permonosulfate (PMS). Results showed that cobalt oxides were effectively deposited onto the biochar surface, new oxygen functional groups were added to the modified biochar, and the presence of the metallic element Co enhanced the efficiency of PMS activation in the composite. More than 90% of MNZ was removed after 60 min with a catalyst dosage of 0.2 g/L and a PS concentration of 1 mM. After four reuses, Co-MBC still showed excellent catalytic performance to degrade over 75% of MNZ. The reaction system performed well even in the presence of inorganic anions and organic macromolecules. However, the degradation rate was inhibited under alkaline conditions. The quenching experiment indicated that •SO4−, •OH,1O2, and •O2−synergistically degraded MNZ, and that•SO4−played a dominant role. LC-MS was applied to assess intermediate degradation products, in which CO2, H2O, and NO3−were the final degradation products, and potential degradation pathways were suggested. In conclusion, Co-MBC was an efficient and stable catalytic material, and its ability to activate PMS was improved to effectively degrade antibiotics, a typical priority pollutant.
研究领域:
环境科学
·
污染治理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）