ENERGY & FUELS
·
2023
·
IF 5.3
Junhui Liu,Bing Li,Mengting Li,Yuan Hu,Shan Han,Xinwen Guo
Transformation of abundant and economical feedstock CO2 and renewable H2 into valuable hydrocarbons is considered a prospective route for the storage of renewable energy. However, it is also a challenge to prepare highly stable and active catalysts. Herein, active and stable catalysts were designed by pyrolysis of the Fe-modified bimetal-ZIFs with varied ratios of Zn/Co, in order to introduce Zn in situ as a structure promoter and Co for an increase of the CO2 conversion. CO2 conversion increased by improving the Co content, while CH4 selectivity also increased obviously. The superior selectivity of value-added hydrocarbons and the ratio of olefins and paraffins (O/P) were obtained without addition of alkali metals. The O/P is 1.76 over FeZnCo-NC-59. The N-doped porous carbon catalysts delivered a good stability in a 1000 h test under harsh reaction conditions. The stable catalysts provide a promising prospect for further application in CO2 hydrogenation.
研究领域:
化学工程
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催化科学
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能源转换
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 46
·28535-28541
·
IF 3.361
Peng Wang,Mingzhi Wang,Jianqiao Lu
Direct conversion of CO2 to high value-added carbon products based on molten salt electrochemistry has been proven to be a feasible approach to solve the climate problem and achieve carbon neutrality. In this work, carbon nanotubes (CNTs), carbon spheres (CSs) and honeycomb carbon are synthesized by electrolysis of a single or multiple alkali metal carbonate electrolyte. The elemental composition, morphology and structure, crystallinity and graphitization degree of carbon products are characterized by electron dispersive spectroscopy (EDS), scanning electron microscopy (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD) and Raman microspectroscopy (RAM). The results demonstrate that a high yield of CNTs is obtained in Li2CO3 electrolyte by regulating the electrolysis temperature and current density. Compared to pure Li2CO3, Li–Na carbonate electrolyte with 1 wt% stannic oxide/cerium oxide (SnO2/GeO2) favors CS formation rather than CNT formation. Additionally, honeycomb carbon products are generated in Li–Na–K electrolyte, when the electrolysis temperature is lower than 600 °C. Overall, this work provides a novel carbon neutral strategy where high value-added carbon products are synthesized using CO2 as a carbon source.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Yongmin Xie,Weizi Cai,Jie Xiao,Yubao Tang,Jiang Liu,Meilin Liu
Solid oxide fuel cells (SOFCs), with yttrium stabilized zirconia (YSZ) as electrolyte, composite of strontium-doped lanthanum manganate (LSM) and YSZ as cathode, and cermet of silver and gadolinium-doped ceria (GDC) as anode, are prepared and tested with 5wt% Fe-loaded activated carbon as fuel and ambient air as oxidant. It is found that electricity and CO gas can be cogenerated in the direct carbon SOFCs through the electrochemical oxidation of CO and the Boudouard reaction . The gas–electricity cogeneration performances are investigated by taking the operating time of the DC-SOFCs as a measure of rate decrease of the Boudouard reaction. Three single cells and a two-cell-stack are tested and characterized in terms of electrical power output , CO production rate, electrical conversion efficiency, and overall conversion efficiency. It turns out that a rapid rate of the Boudouard reaction is necessary for getting high electrical power and CO production. Taking the emitted CO as part of the power output, an overall efficiency of 76.5% for the single cell, and of 72.5% for the stack, is obtained.
研究领域:
能源科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Mingyang Zhou,Qian Zhou,Qianyuan Qiu,Wei Wang,Jiang Liu
A completely sealed high temperature carbon-air battery is proposed and prepared using a tubular oxygen-ion-conducting yttrium stabilized zirconia electrolyte with anode inside and cathode outside. CaO and carbon powders, with a molar ratio of 0.5, 0.75, and 1.0, are respectively loaded in the anode chamber , in two ways: One is mixing CaO and C together (mixing mode) and the other is loading them one by one (separating mode). The electrochemical output performance and discharging time of the batteries increase with decreasing CaO/C ratio. Thermodynamic calculation results show that the pressure of the anode chamber of a battery increases with more carbon oxidized. CO 2 produced through the electrochemical oxidation of carbon can be absorbed by CaO to produce CaCO 3 , resulting in relieve of pressure. However, insufficient CO 2 for maintaining the operation of battery is also caused by CaO. This evidence may be mitigated by loading C and CaO separately to avoid immediate reaction between CO 2 and CaO. A carbon-air battery with 0.25 g carbon powder separately loaded with CaO in a CaO/C ratio of 0.5 discharges at 200 mA for 6.9 h, giving a practical specific energy density of 1300 Wh kg −1 , considering the mass of both C and CaO.
研究领域:
能源科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 1
·145
·
IF 3.4
Jin Xiang,Shuchang Wang,Yuanxin Cao,Lining Fang,Wei Ke,Hui Guo,Baoyu Duan,Wenhe Yu,Liang Li,Zilong Zhao
As an environmental semiconductor material, TiO2has important applications in the fields of environmental protection and water treatment. The preparation of P25 particles into nano-functional material films with a high specific surface area has always been a bottleneck limiting its large-scale application. In this paper, a one-step method of preparing TiO2nanocomposites by doping carbon nanotube (CNT) and carbon quantum dots (CQD) with tetrabutyltitanate and P25 TiO2under ultrasonic radiation is proposed to synthesize a novel antifouling material, which both eliminates the bacterium of Escherichia coli and shows good photoelectric properties, indicating a great value for the industrial promotion of TiO2/CNT. This mesoporous composite exhibits a high specific surface area of 78.07 M2/g (BET) and a tested pore width range within 10–120 nm. The surface morphology of this composite is characterized by TEM and the microstructure is characterized through XRD. This preparation method can fabricate P25 particles into a nano-functional material film with a high specific surface area at a very low cost.Keywords:TiO2;carbon quantum dots;one-step synthesis;ultrasonic radiation;carbon nanotube;mesoporous nanocomposites
研究领域:
环境科学
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材料科学
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2018
·
IF 6.945
Haoran Xu,Bin Chen,Houcheng Zhang,Peng Tan,Guangming Yang,John T.S. Irvine,Meng Ni
In this paper, 2D models for direct carbon solid oxide fuel cells (DC-SOFCs) with in situ catalytic steam-carbon gasification reaction are developed. The simulation results are found to be in good agreement with experimental data. The performance of DC-SOFCs with and without catalyst are compared at different operating potential, anode inlet gas flow rate and operating temperature. It is found that adding suitable catalyst can significantly speed up the in situ steam-carbon gasification reaction and improve the performance of DC-SOFC with H 2 O as gasification agent . The potential of syngas and electricity co-generation from the fuel cell is also evaluated, where the composition of H 2 and CO in syngas can be adjusted by controlling the anode inlet gas flow rate. In addition, the performance DC-SOFCs and the percentage of fuel in the outlet gas are both increased with increasing operating temperature. At a reduced temperature (below 800 °C), good performance of DC-SOFC can still be obtained with in-situ catalytic carbon gasification by steam. The results of this study form a solid foundation to understand the important effect of catalyst and related operating conditions on H 2 O-assisted DC-SOFCs.
研究领域:
能源科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Ishioma Laurene Egun,Bamidele Akinwolemiwa,Haiyong He,Mingchan Ma,Zhengfei Chen,George Z. Chen,Di Hu
Non-lignin-rich biomass has abundant reserves but remains underutilised as a sustainable carbon source for producing functional carbon materials in energy storage applications. The primary challenge is to develop an efficient and sustainable process to convert these resources into high-performance carbon as electrode active material for supercapacitors. To address this issue, a facile, low-cost molten base carbonisation and activation (MBCA) process is investigated to convert wet Radish (a non-lignin–rich biomass) into hierarchical porous carbon via a single thermal stage. This approach integrates carbonisation, in-situ activation, and heteroatom retention, yielding carbon with a specific surface area of 1172 m 2 g −1 , ultramicropores (0–0.7 nm), partial graphitic structure and nitrogen/oxygen-rich functional groups. The optimised carbon, obtained at 700 ˚C, as a supercapacitor electrode active material exhibited electrochemical performance, with a specific capacitance of 257F g −1 at 5 mV s −1 and 96F g −1 at 2 A g −1 , alongside remarkable cycle stability (92.6 % capacitance retention over 20,000 cycles) and low self voltage decay over 50 h. These results highlight the MBCA process as a viable solution for converting non-lignin-rich biomass into high-performance carbon materials, offering a practical and sustainable alternative for energy storage applications while mitigating environmental pollution from biomass decomposition.
研究领域:
材料科学
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能源存储
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yanghao Feng,Wendi Zhang,Kunpeng Tang,Yingzhi Chen,Huiju Cao,Yuan Hu,Weili Cui,Lei Shi,Guowei Yang
Single-walled carbon nanotubes (SWCNTs) serve as ideal templates for synthesizing inner tubes with engineered diameters, resulting in the formation of double-walled carbon nanotubes (DWCNTs). This approach enables the synthesis of confined carbyne (CC) with tailored properties through the newly formed inner tubes. The formation of CC primarily relies on carbon sources derived from the SWCNTs themselves via structure reconstruction under high-temperature annealing, leading to inherently low yield of CC due to insufficient carbon supply. To enhance the yield of CC, we explored the introduction of internal carbon sources, which are small enough to be inserted inside the SWCNTs, such as organic solvents or fullerene molecules; however, further improvements remain challenging. In this study, we demonstrate that incorporating external carbon sources via surfactants on the walls of SWCNTs significantly increases the yield of CC. The surfactants decompose at high temperatures, releasing carbon atoms that integrate into both the DWCNT structure and the CC; thus, the Raman intensity of CC increased by approximately 2.1 times compared to the empty counterpart. Moreover, combination of external surfactants and internal C 70 results in an ultrahigh Raman intensity of CC, exhibiting value approximately 30 times greater than that of the pristine SWCNTs. These findings underscore the potential of engineered both external and internal precursors to boost the synthesis of CC, benefiting their applications.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2022
·Vol. 75
·期 4
·1019-1033
·
IF 2.597
Luo Yinbo,He Dongfeng,Zhao Hongbo
Indirect mineral carbonation is considered an ideal CO 2 sequestration strategy because of its high carbonation rate and high value-added products. This research explores the carbonation ability of different carbon species—CO 3 2– ions, HCO 3 – ions, and H 2 CO 3 —in their dominant region. When (NH 4 ) 2 CO 3 was used as the carbon source, the Ca 2+ ions carbonation rate was hardly affected by pH, while NH 4 HCO 3 was the opposite. When the pH of the leachate decreased from 8.67 to 6.20, the carbonation rate of (NH 4 ) 2 CO 3 decreased from 99.32% to 98.42%, while the carbonation rate of NH 4 HCO 3 decreased from 96.28% to 37.71%. Meanwhile, this research also probed the influence of the nucleating agent on the carbonation rate and carbonation products. The addition of nucleating agent can increase the carbonation rate. For a CH 3 COOH concentration of 0.6 M for mixed leaching, the carbonation rate was increased by 26.81% with the addition of nucleating agent. Meanwhile, the nucleating agent can also induce the growth of CaCO 3 toward the crystal form of the nucleating agent itself. When (NH 4 ) 2 CO 3 and NH 4 HCO 3 were used as the carbon sources, CaCO 3 mainly exists in the crystal form of vaterite, and after adding the nucleating agent, the crystal form changes to calcite.
研究领域:
环境科学
·
化学工程
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材料科学
·
地球化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Dengyang Wang,Qing Wang,Mingxiu Tan,Shasha Wang,Shaohua Luo,Pengqing Hou,Yahui Zhang,Shengxue Yan,Xin Liu
Carbon quantum dots (CQDs) as a multifunctional carbon nanomaterial have drawn great attention in the field of energy attribute to quantum size, various functional groups and unique physicochemical properties. In this work, the CQDs were prepared from soybean by a simple hydrothermal method , then further pyrolyzed into honeycomb carbon (HC), spherical pore carbon (SC) and bulk porous carbon (BC) with the assistance of templates, respectively. As the anode materials in potassium ion battery (PIBs), HC delivered a high specific capacity of 280.5 mAh g −1 at 0.1 A g −1 and a superior rate performance (136 mAh g −1 at 5 A g −1 ), ascribing to its abundant surface active sites of potassium ion storage and special structures conducive to potassium ion diffusion. This study provides an excellent anode for PIBs from a simple route to construct CQDs-derived carbon.
研究领域:
材料科学
·
能源存储
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2019
·
IF 7.466
Ruilong Cai,Bo You,Min Chen,Limin Wu
N-doped carbon/carbon heterojunction holds huge potential for efficient CO 2 capture. Here, a series of site-specific N-doped core-shell carbon spheres with carbon/carbon heterojunction were successfully prepared by carbonization of polypyrrole coated hypercrosslinked polystyrene spheres, followed by chemical activation with KOH. These activated carbon spheres possessed large specific surface area (2080 m 2 g −1 ) and abundant micropores (0.45 cm 3 g −1 ). Despite their low nitrogen content (0.96 wt%), the CO 2 adsorption capacities of activated samples reached 3.69 and 5.80 mmol g −1 measured at 298 and 273 K, respectively, under atmospheric pressure (1 bar). More significantly, the N-doped carbon/carbon heterojunction contributes to a stronger and denser CO 2 packing in this system.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
He Sun,Jiaming Chen,Yusheng Yang,Min Qiu,Milin Zhang
A low-grade ore containing 4 % niobium and 7 % titanium has been extracted from Bayan Obo tailing, but its potential has not been fully utilized. This study aims to recover the niobium and titanium elements from this low-grade ores in the form of their carbides. The process involves reducing niobium and titanium to (Nb,Ti)C through a carbothermal process. During this process, iron and silicon are also reduced to Fe-Si intermetallic compounds, allowing (Nb,Ti)C to diffuse into them. Subsequently, selective electrochemical oxidation is used to separate (Nb,Ti)C from the Fe-Si intermetallic compounds in an aqueous ferrous sulfate solution. The Fe-Si intermetallic compounds are first oxidized to the Fe 3 Si phase, and then to the Fe 5 Si 3 phase in the solution with pH 0.35. The (Nb,Ti)C/matrix interfaces are identified as the preferred site of electrochemical pitting corrosion. By exploiting the electrochemical oxidation reaction of iron in the matrix, (Nb,Ti)C powders are separated along these interfaces. The by-products of this process are FeSi alloys, which are evaluated for their electrocatalytic properties in oxygen evolution reactions. It is found that the Fe 5 Si 3 alloy by-product exhibits good electrocatalytic activity and kinetics in the oxygen evolution reaction, demonstrating its potential for practical applications.
研究领域:
冶金学
·
材料科学
·
电化学
✓ 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）