ACS Applied Energy Materials
·
2024
·
IF 5.4
Shaohui Wang,Lin Li,Hua Wang,Xiaowen Wang,Tonghua Wang
The continuous and scalable manufacture of porous carbon electrode materials with controlled pore architecture holds paramount importance in the development of efficient and sustainable energy storage systems. Herein, a green and industrially feasible physical activation strategy was proposed to produce heteroatom self-doped hierarchical porous carbons (HPCs) by using polyvinyl butyral (PVB) as a sacrificial template and cross-linking agent and low-rank coal as a low-cost precursor. The optimal HPC-20 has highly interconnected multiscale pore structure, large specific surface area, and heteroatom-enriched surfaces. The synergistic effect of these advantages provides HPC-20 with a variety of benefits, including fast charge/discharge rates and abundant energy storage sites. Specifically, HPC-20 exhibited an appreciable specific capacitance of 304 F g–1 at 0.5 A g–1 and an excellent rate performance (capacitance retention of 65.8% at 50 A g–1). Furthermore, the symmetric supercapacitor achieved a maximum energy density of 23.1 W h kg–1 at a power density of 450 W kg–1 in 1 M Na2SO4 electrolytes. This work proposes an approach for the large-scale production of porous carbon with a controllable pore structure from low-rank coal.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Hengdong Ren,Jialin Ma,Zaisheng Zhu,Zhenying Liu,Yin Liu,Ling Bing Kong,Fanfei Min,Jinbo Zhu
Coal-derived carbon/Ni 3 Fe magnetic composites with frequency dependent microwave absorption performance were prepared at low temperatures (750–850 °C) using coal as the carbon source. The Ni 3 Fe alloy was successfully formed due to the carbothermal reaction and reducing gas. SEM images indicate the surface becomes rougher and the number of interlayer of the composites increases with increasing reaction temperature. Consistently, high degree of graphitization of the coal-derived carbon was confirmed by using Raman spectroscopy. Specifically, coal-derived carbon/Ni 3 Fe magnetic composites exhibit frequency-dependent microwave absorption characteristics at 2–18 GHz, that is, as the reaction temperature rises from 750 °C to 850 °C, the minimum reflection loss gradually shifts to low frequencies. Among them, CC/Ni 3 Fe (8 0 0) -0.4 exhibits a minimum reflection loss of −60.76 dB at 16.64 GHz, while the thickness is only 1.28 mm. Such a clean strategy provides experience for the environmental application of coal and microwave absorption. Meanwhile, a lightweight, stable and efficient microwave absorber has been developed.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2018
·
IF 4.439
Ying Xu,Shengnan Wang,Xiaoyan Hou,Zhe Sun,Yong Jiang,Zhongbing Dong,Quanbao Tao,Jun Man,Yan Cao
N, P, S co-doped graphene quantum dots (NPS-GQDs) were prepared via a one-step wet chemical plus dialysis method directly using anthracite coal as raw material. This facile oxidation process simultaneously synthesized graphene quantum dots (GQDs) and doped N, P and S atoms on edges or forming functional groups of GQDS. X-ray photoelectron spectroscopy (XPS) proved that the involved heteroatoms were successfully doped on GQDs. The local doping of N, P and S on GQDs can reach high levels as 5.6%, 3.7% and 3.7% (by atomic) during XPS detection, respectively. Raman spectra showed that the amount of defects or disorders of prepared GQDs increased during the transition of the coal hunk toward the nano-GQDs. The effect of graphitizing degree of applied coals (varied coal ranks) on the formation of GQDs implied that raw coals with too high or too low graphitizing degree were not optimizing for the formation of high-quality GQDs. The prepared NPS-GQDs showed excellent properties on the excitation-dependent fluorescence and the quench by some trace metals. Thus, the NPS-GQDs were applied to detect of Pb 2+ in both a DI water and a multi-elements analysis matrix, exhibited wide linear detection range (1–20 μM) and a detection limit of 0.75 μM.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
·
2020
·
IF 2.717
Hengdong Ren,Xiangfeng Shu,Zhenying Liu,Jun Zhou,Jialin Ma,Yin Liu,Ling Bing Kong,Fanfei Min,Xichen Shi,Jinjin Han,Xin Yang
A facile in-situ strategy has been developed to synthesize lightweight ultrathin coal-derived carbon-nickel composites (CDC/Ni) with superior microwave absorption performances using anthracite as raw material for the first time. The phase structure and chemical composition were investigated by X-ray diffractometry (XRD) and X-ray photoelectron spectroscopy (XPS). Field emission scanning electron microscopy (FESEM) images indicate that the surface of the composite is covered with layered stripes and a large number of macropores. Transmission electron microscopy (TEM) images show Ni nanoparticle size from 30 to 80 nm. Since the introduction of magnetic nickel increases the magnetic loss and improves impedance matching, the CDC/Ni magnetic composites exhibit excellent microwave absorption performance. Specifically, a minimum reflection loss of −62.51 dB is observed at 15.76 GHz, with an effective absorption bandwidth of 4.08 GHz, while the thickness is only 1.31 mm. The superior microwave absorption performance is mainly attributed to the suitable conductivity of CDC. The presence of the nickel nanoparticles has enabled to achieve impedance matching. Besides, the special morphology and oxygen-containing functional groups also bring out various loss mechanisms. Therefore, such CDC/Ni composites could be potential lightweight high performance microwave absorbing materials. In addition, our strategy is a cleaner and more efficient process to utilize coals.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2022
·
IF 3.806
Xinmei Gao,Zhimeng Shen,Gaobo Chang,Zhong Li,Hanqing Zhao
Carbon materials have been widely used as the sodium ion batteries (SIBs) anodes. The pore structure and surface chemistry are critically important to improve the sodium storage performance. Here, the mechanochemistry assisted N-doping strategy was adopted to achieve pore regulation and pyridinic nitrogen doping in anthracite-derived carbon. The mechanochemistry method was conducive to introducing abundant mesopores, with the mesopore volume enhanced by 80 %–171 %. The mechanochemistry method facilitated the generation of abundant edge defects and sodium adsorption sites including pyridinic nitrogen and carbonyl groups. Therefore, the N-doped anthracite anode with improved Na + and electron dynamics, delivered an enhanced reversible capacity of 320.9 mA h g −1 under 0.03 A g −1 and retains 194.4 mA h g −1 under 1 A g −1 after 1000 cycles. This work offers a novel and green approach to adjusting pore structure and surface chemistry of coal-based carbon materials and promotes the large-scale application of SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2025
·
IF 3.7
Rongrong Tao,Qian Sun,Jiaxin Zhang,Guoqiang Zhao,Aidong Tang,Huaming Yang
Carbon-supported platinum (Pt) nanoparticles (NPs) are efficient electrocatalysts for the hydrogen evolution reaction (HER) but suffer from suboptimal kinetics in alkaline media. While restructuring interfacial water molecules offers a promising route to enhance alkaline HER, simple and effective strategies remain scarce. Here, we prepared Pt NPs on different carbon supports with varied compositions of oxygen-containing functional groups (OFGs) and explored the correlation between the HER activity and the OFG composition. Structural analyses confirm negligible effects of the support on the morphology, size, or electronic states of Pt NPs. However, in situ Raman spectroscopy reveals that OFGs, including carbonyl (C = O) and carboxyl (COOH) groups increase the proportion of interfacial free water molecules by reorganizing local hydrogen bonding. Meanwhile, a bituminous coal-derived carbon (bitu@C), featuring abundant OFGs, was developed as a functional support for Pt NPs. The Pt/bitu@C catalyst achieves a mass activity of 1.33 A mg pt −1 at an overpotential of 100 mV, significantly outperforming commercial carbon-supported counterparts, while exhibiting enhanced stability. This work highlights the critical role of OFGs in modulating water structures and provides a practical, coal-derived platform for engineering interfacial water molecules toward efficient alkaline HER kinetics. Graphical Increasing interfacial free H 2 O accelerates the alkaline HER, yet simple and effective methods remain scarce. This work shows that carbonyl and carboxyl groups on carbon supports greatly increase the ratio of free H 2 O via forming local hydrogen bondings. Consequently, a functional support derived from bituminous coal renders Pt with high activity and stability.
研究领域:
电催化
·
材料化学
·
物理化学
·
能源科学
·
纳米催化
·
表面科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 9
·1253
·
IF 4.034
Huihui Zeng,Baolin Xing,Lunjian Chen,Guiyun Yi,Guangxu Huang,Ruifu Yuan,Chuanxiang Zhang,Yijun Cao,Zhengfei Chen
A novel approach is developed to synthesize a nitrogen-doped porous Co3O4/anthracite-derived graphene (Co3O4/AG) nanocomposite through a combined self-assembly and heat treatment process using resource-rich anthracite as a carbonaceous precursor. The nanocomposite contains uniformly distributed Co3O4nanoparticles with a size smaller than 8 nm on the surface of porous graphene, and exhibits a specific surface area (120 m2·g−1), well-developed mesopores distributed at 3~10 nm, and a high level of nitrogen doping (5.4 at. %). These unique microstructure features of the nanocomposite can offer extra active sites and efficient pathways during the electrochemical reaction, which are conducive to improvement of the electrochemical performance for the anode material. The Co3O4/AG electrode possesses a high reversible capacity of 845 mAh·g−1and an excellent rate capacity of 587 mAh·g−1. Furthermore, a good cyclic stability of 510 mAh·g−1after 100 cycles at 500 mA·g−1is maintained. Therefore, this work could provide an economical and effective route for the large-scale application of a Co3O4/AG nanocomposite as an excellent anode material in lithium-ion batteries.Keywords:Co3O4nanoparticles;anthracite-derived graphene;nanocomposite;lithium-ion batteries
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 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）