CATALYSIS TODAY
·
2015
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IF 3.893
Minli Niu,Rongshu Zhu,Fei Tian,Kelin Song,Gang Cao,Feng Ouyang
A series of carbon modified BiVO 4 (C–BiVO 4 ) photocatalysts were synthesized by impregnation calcination method of BiVO 4 with glucose, sucrose and cellulose as precursors, respectively. The prepared photocatalysts were characterized by XRD, HR-TEM, SEM, Raman, BET, UV–vis DRS and PL. Their photocatalytic activities were investigated by degradation of phenol under the visible light. The precursor and loading of carbon had remarkable effects on physical–chemical properties of samples and degradation activities of phenol. The increase of the number of carbon ring in precursors led to a better crystallinity, smaller grain size, larger surface area and higher separation efficiency of electron–hole pairs. The increase of loading led to a smaller catalyst grain size, larger surface area, higher visible light absorption and higher separation efficiency of electron–hole pairs. The results showed that the 0.5 wt.% of C–BiVO 4 –cellulose has the best photocatalytic activity and degraded 88.7% of 5 mg/L phenol. Besides, addition of 25 mmol KBrO 3 as an electron capture agent can degrade 27.4% of 1000 mg/L phenol. The degradation efficiency of the same system above mentioned under sunlight irradiation was 22.6%. In addition, the relationship between the photocatalytic activity of C–BiVO 4 and its physical–chemical properties was also discussed.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Nano Energy
·
2016
·
IF 11.553
Chuanshen Wang,Yi Xi,Mingjun Wang,Chengshuang Zhang,Xue Wang,Qi Yang,Wenlong Li,Chenguo Hu,Dazhi Zhang
The Na 2 Ti 3 O 7 ·2H 2 O nanobelts (Na-TNBs) with layered structure have been prepared by simple hydrothermal method . The carbon modified Na-TNBs (C/Na-TNBs) supercapacitor has been encapsulated by the flexible and stretching PDMS (poly-dimethylsiloxane), which has flexible and stretching property. The capacitance of the device can attain 459.71 F g −1 at scan rate of 25 mV/S and energy density of 33.2 Wh kg −1 at power density 478 W kg −1 and power density of 2.13 kW kg −1 at energy density 25.36 Wh kg −1 . The retention of specific capacitance remains 74.3% after 6000 cycles at high current value of 35 mA. Three supercapacitors in series can light 100 green color commercial light emitting diodes (LEDs) for about 10 min. All these results indicate that the C/Na-TNBs nanomaterial could provide the potential application in high performance supercapacitor .
研究领域:
材料科学
·
能源存储与转换
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 29
·44794-44805
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IF 5.19
Wu Mingda,Lu Linghong,Zhou Tao,Ma Yi,Weng Zhengsong
Calcium and magnesium ions usually exist in natural water. When Cd 2+ is removed from water by adsorption, it will be inhibited by these two ions. Titanate nanotubes (TNTs) have an effective adsorption capacity for Cd 2+ due to extraordinary ion exchange property. However, TNTs also adsorb Ca 2+ and Mg 2+ in water. In this study, carbon-modified TNT (TNT/C) and TNT/C further treated with acid (TNT/HC) were synthesized by hydrothermal synthesis. The transmission electron microscope (TEM) images show that TNT/C or TNT/HC still keep nanotube morphology. The experimental results show the order of adsorption amount to Cd 2+ is TNT (171.56 mg/g) > TNT/C (166 mg/g) > TNT/HC (159.88 mg/g) when there is no Ca 2+ or Mg 2+ . But when there is 0.1 M Ca 2+ or Mg 2+ in the water, the order of Cd 2+ adsorption capacity becomes TNT/HC (44.28, 49.04 mg/g) > TNT/C (58.84, 69.32 mg/g) > TNT (65.52, 70.6 mg/g). It indicates that the surface carbon modification can alleviate the hindrance of Ca 2+ or Mg 2+ to Cd 2+ removal. This is because the carbon on the surface of TNT captured part of Ca 2+ or Mg 2+ ; it made more Cd 2+ be successfully absorbed by TNT through ion exchange. This mechanism was confirmed by the X-ray photoelectron spectroscopy (XPS) spectra analysis. The results of this paper can provide ideas for the adsorption and removal of Cd 2+ in water in the presence of Ca 2+ or Mg 2+ .
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2021
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IF 3.605
Zhihui Xu,Xuelei Li,Shishuai Sun,Zepeng Wei,Hongguo Li,Shougen Yin
The synergistic effect of the electrochemical double-layer and pseudocapacitance electrode materials has been extensively used to improve the performance of composite electrodes for supercapacitors (SCs). However, the energy density of SCs is still unsatisfactory for practical utilization. Herein, a C-NiCo2O4/C@Ni–Co–S electrode is ingeniously devised through coupling the interior of 0D/2D carbon-modified NiCo2O4 and the external sheath of Ni–Co–S nanosheets. The 0D carbon quantum dot doping can effectively avoid the agglomeration of NiCo2O4 nanoparticles and improve the electronic conductivity. 2D carbon as the intermediate layer can ameliorate the physical/chemical stability of the electrode. Ni–Co–S nanosheets can improve the area-specific capacitance of the electrode and thus enhance the energy density of the device. As expected, the C-NiCo2O4/C@Ni–Co–S electrode delivers an outstanding specific capacitance of 2396 F g–1 (7.9 F cm–2) at 3 A g–1 and excellent cycling stability (92% after 10 000 cycles). Furthermore, a quasi-solid-state asymmetric supercapacitor (ASC) using C-NiCo2O4/C@Ni–Co–S as positive electrode and active carbon (AC) as negative electrode exhibits a high energy density of 95 Wh kg–1 at 0.9 kW kg–1 and an excellent cycle performance. Our work reveals that this reasonable structure design is very effective for achieving a high-performance positive electrode for practical SC applications.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2019
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IF 6.97
Wei Lv,Yuting Zhu,Jing Liu,Chenguang Wang,Ying Xu,Qi Zhang,Guanyi Chen,Longlong Ma
We developed a Pd-doped catalyst where the support MgO was modified with carbon species via methanol thermal annealing, catalyzing the cleavage of β-O-4 lignin-type dimers and actual lignin into aromatics. Methanol as a carbon precursor was processed to a carbon species that was loaded with metallic palladium. The carbon species supported Pd on MgO surface changed the acid–base strength and affected the catalytic activity of C–O bond hydrolysis/hydrogenolysis. The β-O-4 linkage in dimer was effectively fractured over Pd/MgO-C, and catalyst’s strong acid facilitated aldehyde decarboxylation to alkyl aromatics while relatively weak acid and strong base were highly selective for stable aromatics (such as 1-methoxy-4-propylbenzene and 1-methoxy-4-(propenlyl) benzene). This allowed Pd/MgO-C-700 to be successfully applied to pine depolymerization, to give 24.6 wt % of aromatics; in addition, almost β-O-4 linkages were broken at 160 °C, and surprisingly, 77.2% of 2-methoxy-4-(propenlyl)phenols was obtained. The reaction pathways for lignin valorization are hypothesized over the Pd/MgO-C catalyst.
研究领域:
化学工程
·
催化科学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2017
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IF 2.813
Xin Liu,Yuhong Zhang,Yushuai Jia,Junzhe Jiang,Yabin Wang,Xiangshu Chen,Tian Gui
We report the fabrication and photocatalytic property of a composite of C/CaFe 2 O 4 nanorods (NRs) in an effort to reveal the influence of carbon modification. It is demonstrated that the photocatalytic degradation activity is dependent on the mass ratio of C to CaFe 2 O 4 . The optimal carbon content is determined to be 58 wt% to yield a methylene blue (MB) degradation rate of 0.0058 min −1 , which is 4.8 times higher than that of the pristine CaFe 2 O 4 NRs. The decoration of carbon on the surface of CaFe 2 O 4 NRs improves its adsorption capacity of the MB dye, which is specifically adsorbed on the surface as a monolayer according to the adsorption isotherm analysis. The trapping experiments of the reactive species indicate that superoxide radicals ( • O 2 − ) are the main active species responsible for the removal of MB under visible-light irradiation. Overall, the unique feature of carbon coating enables the efficient separation and transfer of photogenerated electrons and holes, strengthens the adsorption capacity of MB, and improves the light harvesting capability, hence enhancing the overall photocatalytic degradation of MB.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2021
·
IF 4.641
Guang Xu,Ying Zhang,Dandan Peng,Donghai Sheng,Yao Zhang,Ye Tian,Di Ma
In this paper, carbon modified porous TiO 2 mixed-phase junction was successfully fabricated by using the MIL-125(Ti)-P25 composite as the precursor. The porous TiO 2 possessed abundant pores and large surface area inherited from its precursor during a simple one-step pyrolysis in a crucible, and the modified TiO 2 showed catalytic activity for photocatalytic cyclohexane oxidation. Moreover, the ratios of anatase/rutile TiO 2 and carbon contents in the modified TiO 2 mixed-phase junction can be regulated conveniently. Among the mixed-phase porous TiO 2 , the C TiO 2 –4 sample containing 12.4 wt% rutile TiO 2 presented the best photocatalytic activity, which was also much better than those of carbon modified pure anatase or rutile TiO 2 . The carbon modification was characterized by carbon doping and surface carbon species, which played the vital role in enhancing the photocatalytic activity of the mixed-phase TiO 2 . Carbon doping into TiO 2 lattice can effectively reduce its band gap energy and extend the light response range. The carbon species on the TiO 2 surface can improve the light absorption efficiency and promote the transport of photogenerated electrons. Free radicals capture experiments demonstrated that •OH and •O 2 − radicals were important active species in the cyclohexane oxidation reaction. This work provides a MOF-mediated P25-assisted synthesis strategy that may guide the design of other photocatalysts.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2025
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IF 4.1
Zeyu Jin,Yuelin Wang,Linshan Zhu,Jingzi Zhang,Xi Lin
Oxygen evolution reaction (OER) plays an important role in the energy conversion industry. Despite the prevalent reliance on noble metals for their superior catalytic attributes, their high cost and limited availability present significant challenges. Reducing the use of noble metals in catalysts while maintaining catalytic activity and stability in various chemical environments is a major challenge in heterogeneous catalysis. In this study, we have strategically enhanced the catalytic performance of the Cr 2 O 3 oxide by introducing multiple transition metal dopants to modulate its electronic structure. It is found that doping Ni/Co/Cu/Ru into the Cr 2 O 3 oxide results in the best OER performance, which outperforms RuO 2 and other reported materials. We further improved the cycling stability of the multi-component catalyst by coating amorphous carbon on its surface. Specifically, with an OER overpotential of merely 210 mV at 10 mA cm −2 and a low Tafel slope of 59.5 mV dec −1 , the catalyst exhibits remarkable catalytic efficiency. More importantly, it can withstand high current tests exceeding 100 mA cm −2 for over 80 h without significant degradation of its OER catalytic performance. In addition, the catalyst exhibits exceptional hydrogen evolution reaction (HER) performance which is close to Pt/C, making it suitable for use as a bifunctional water splitting device. These findings have opened up a new field for the design and application of multi-component catalysts.
研究领域:
材料科学
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电催化
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DOI
高影响因子
JOURNAL OF CHEMICAL PHYSICS
·
2024
·Vol. 160
·期 9
·
IF 3.1
Lin Yuda,Chen Yiheng,Qiu Liting,Zheng Shenghui
In view of the inherent pseudocapacitance, rich redox pairs (Nb 5+ /Nb 4+ and Nb 4+ /Nb 3+ ), and high lithiation potential (1.0–3.0 V vs Li/Li + ), Nb 2 O 5 is considered a promising anode material. However, the inherent low electronic conductivity of Nb 2 O 5 limits its lithium storage performance, and the rate performance after carbon modification is still unsatisfactory because the intrinsic conductivity of Nb 2 O 5 has not been substantially improved. In this experiment, taking the improvement of the intrinsic electrical conductivity of Nb 2 O 5 as the guiding ideology, we prepared F-doped Nb 2 O 5 @fluorocarbon composites (F–Nb 2 O 5 @FC) with a large number of oxygen vacancies by one-step annealing. As the anode electrode of lithium-ion batteries, the reversible specific capacity of F–Nb 2 O 5 @FC reaches 150 mA g −1 at 5 A g −1 after 1100 cycles, and the rate performance is particularly outstanding, with a capacity up to 130 mA g −1 at 16 A g −1 , which is far superior to other Nb 2 O 5 @carbon-based anode electrodes. Compared with other single conductivity sources of Nb 2 O 5 @carbon-based composites, the electrical conductivity of F–Nb 2 O 5 @FC composites is greatly improved in many aspects, including the introduction of free electrons by F − doping, the generation of oxygen vacancies, and the provision of a three-dimensional conductive network by FC. Through analytical chemistry (work function, UV–Vis diffuse reflectance spectroscopy, and EIS) and theoretical calculations, it is proved that F–Nb 2 O 5 @FC has high electrical conductivity and realizes rapid electron transfer.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Mue Tang,Yujie Wang,Laizheng Luo,ShiYu Lu,Xiaoyan Liu,Jun Zhang
The development of low-cost and high-efficient electrocatalysts for oxygen reduction reaction (ORR) is a severe challenge for the commercial application of fuel cells. Herein, a durable acidic ORR electrocatalyst composed of carbon nanoparticles decorated on a mesoporous structure of TiN hollow spheres (H-TiN/NC-x) is fabricated for the first time through a hydrothermal-calcination strategy. By moderately adjusting carbon content, the H-TiN/NC-1.00 catalyst exhibits remarkable ORR performance in 0.1 M HClO 4 electrolyte with a half-wave potential of 0.80 V, which is close to commercial Pt/C catalyst (0.83 V). Meanwhile, the catalyst reveals a high selectivity for the four-electron pathway with lower H 2 O 2 yield (7 %) and superior tolerance ability to methanol crossover. More importantly, the H-TiN/NC-1.00 catalyst exhibits a higher stability with negligible activity decay than Pt/C catalyst (ΔE 1/2 = −80 mV) after 10,000 potential cycles. This outstanding ORR performance for H-TiN/NC-1.00 is attributed to the synergistic effect of unique hollow nanostructure and multiple active sites, which can improve electron transfer and ion diffusion/penetration, maintain the structural stability of hollow spheres for exposing more active sites (H-TiN and NC). Our work demonstrates that manipulating surface state and composition of TiN material is a superior method for optimizing ORR performance in fuel cells applications.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Xubing Sun,Jiayong Zhang,Yaohui You
Xanthated black wattle tannin gel (XBTG) was prepared by modifying black wattle tannin gel (BTG) with carbon disulfide to improve the performance of Cu(II) removal. Structure characterization demonstrated that xanthate groups were successfully introduced onto BTG and surface morphology of BTG was maintained after CS 2 -modification. Zeta potential measurement showed that XBTG was negative charged at a pH range from 1 to 5. Compared to the BTG, the thermal stability and the surface area of XBTG decreased, but the Cu(II) adsorption rate and adsorption capacity increased. The adsorption kinetics of BTG and XBTG followed pseudo-second-order model. The adsorption isotherms fitted well with Langmuir model, and the calculated maximum adsorption capacity for the XBTG increased to 149.25 mg/g at 298 K, which was 228.95 % higher than BTG. Moreover, the Cu(II) loaded XBTG could be regenerated using 0.1 M ethylenediaminetetraacetic acid disodium salt solution. The adsorption capacity of the regenerated XBTG after five cycles decreased to 58 % compared with the fresh adsorbent, which was equivalent to that of BTG. The adsorption mechanism was attributed to the surface complexation of Cu(II) by adjacent phenolic hydroxyl groups and xanthate groups or to the ion exchange between Na(I) and Cu(II).
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2016
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IF 4.012
Zheng Jin,Wei Duan,Wubiao Duan,Bo Liu,Xidong Chen,Feihua Yang,Jianping Guo
The commercially available TiO 2 Degussa P25 was modified using a simple technique to produce a visible-light-actived indium and carbon doped P25 catalyst. The modified photocatalysts have been successfully obtained by thermal heating method. These as-obtained products were successfully characterized by X-ray diffraction (XRD), X-ray photoelectrion spectroscopy (XPS), scanning electron microscope (SEM), high resolution transmission electron microscopy (HRTEM), UV–vis diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) spectroscopy respectively. The photocatalytic activities of all prepared catalysts were evaluated by the degradation of organic dyes including methylene blue (MB) and Reactive Red 4 (RR4) under visible light irradiation. As the result shown, the indium and carbon co-doped on P25 nanocomposites possessed the extended light absorption in visible light and better charge separation capability as compared to the pristine P25. The optimum loading of In 3+ ions on P25 was 15%. Moreover, 15% In 2 O 3 /C-P25 showed the highest degradation rate of organic dye, which the removal efficiency can reach over 90% after 90 min and the corresponding hydrogen evolution rate of 15% In 2 O 3 /C-P25 was 9 times than P25. It was concluded that the synergistic effects of In 3+ ions and carbon narrowed the band gap of TiO 2 and promoted charge separation, which played a significant role for the enhancement of photoactivity. In addition, it was observed that the photo-degradation for all catalysts followed the first order reaction kinetics. Furthermore, the influence of initial pH values on the photocatalytic degradation of MB and RR4 using 15% In 2 O 3 /C-P25 catalyst was also investigated. Finally, the stability test of photocatalysts was carried out and the photocatalytic mechanism was explained concretely.
研究领域:
材料科学
·
环境科学
·
光催化技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）