ELECTROCHIMICA ACTA
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2017
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IF 4.798
Chaozhong Guo,Rong Hu,Wenli Liao,Zhongbin Li,Lingtao Sun,Dongping Shi,Yanrong Li,Changguo Chen
Recycling and utilizing organic biowastes will effectively help to decrease the damage to the natural environment and synchronously facilitate the development of new carbon materials for energy applications. In this study, we directly convert protein-rich fish-scale biowaste to hierarchically porous three-dimentional (3D)-network nanocarbons via two-step pyrolysis process combined with ZnCl 2 activation and acidic-treatment. It is interestingly found that this material exhibits more excellent oxygen reduction electrocatalytic activity and stability compared to the commercial 20 wt% Pt/C catalyst in both alkaline and acidic solutions, which can be closely correlated to its chemical state of nitrogen atoms, BET surface area and inner porous structure. The addition of ZnCl 2 activator during pyrolysis process can help to produce the 3D network nanostructure and then to enhance the mesopore surface area, making for the improvement of oxygen reduction performance. More remarkably, the ORR onset potential on our material is about 60 mV higher than that on the Pt/C catalyst in alkaline electrolyte. In addition, we also propose that pyridinic- and graphitic-nitrogen species may be key factors to be responsible for the electrocatalytic activity. This study can encourage the exploration of high porosity nanocarbons from widely-existed biowastes, functioning as highly active and stable oxygen reduction electrocatalysts.
研究领域:
材料科学
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环境科学
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能源材料
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电化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2024
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IF 3.8
Xianen Hu,Yiqing Li,Jun Du,Jingxiang Sun,Chun He,Ya Xiong,Shuanghong Tian
Herein, a novel two-step ZnCl2–KOH activation process was developed to produce wheat bran-derived biocarbon (WBZ5K9) with an ultrahigh specific surface area of 3200.8 m2 g–1, a porous structure mainly containing micropores (0.5–2 nm) and mesopores (2.0–2.17 nm), a high graphitization degree (ID/IG = 0.9), and a good production yield of 21.4%. After further N-doping treatment, the obtained WBZ5K9-N had a similar textural structure but a high N content of 3.5 atom %. Owing to the well-developed pore structure and abundant active adsorption sites (i.e., graphitic carbon and nitrogen), both adsorbents showed ultrahigh adsorption capacities toward various pollutants without pH adjustment. Particularly, WBZ5K9-N presented adsorption capacities of 558.7–1965.3 mg/g toward 6 anionic dyes, 3 cationic dyes, and 4 antibiotics, ranking the top level among the known adsorbents. Finally, the synergistic chemisorption mechanism of electrostatic interaction, π–π stacking interaction, H-bonding, and N interaction was revealed. Such an activation method can be extended to prepare other waste biomass-derived carbons.
研究领域:
环境科学
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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
CHEMISTRY OF MATERIALS
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2020
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IF 9.567
Chenghao Bi,Xuejiao Sun,Xin Huang,Shixun Wang,Jifeng Yuan,Jun Xi Wang,Tönu Pullerits,Jianjun Tian
All inorganic halide perovskites in the form of colloidal quantum dots (QDs) have come into people’s view as one of the potential materials for the high-efficiency solar cells; nevertheless, the high surface trap density and poor stability of QDs restrict the performance improvement and application. Here, we obtain colloidal inorganic perovskite CsPb1–xZnxI3 QDs by the hot-injection synthesis process with the addition of ZnCl2. Synchrotron-based X-ray absorption fine structures demonstrate that the guest Zn2+ ions are doped into the CsPbI3 structure to improve the local ordering of the lattice of the perovskite, reducing the octahedral distortions. The increase of the Goldschmidt tolerance factor and the Pb–I bond energy also enhance the stability of the perovskite structure. Furthermore, the Cl– ions from ZnCl2 occupy the iodide vacancies of the perovskite to decrease the nonradiative recombination. The synergistic effect of doping and defect passivation makes for stable colloidal CsPb0.97Zn0.03I3 QDs with ultralow density of trap states. The champion solar cell based on the QDs shows a power conversion efficiency of 14.8% and a largely improved stability under ambient conditions.
研究领域:
材料科学
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纳米技术
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太阳能
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化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
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2023
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IF 11.1
Fei Zhu,Zhenqi Wang,Jingchun Huang,Wei Hu,Di Xie,Yu Qiao
Activated carbon derived from the organic solid waste is a promising material for ammonia removal. The components in the feedstock would affect the performance of activated carbon, but the detailed effect mechanism remains unknown. To reveal the correlations between the components of the feedstock and different ammonia adsorption styles of activated carbon, this study used pomelo peel to prepare ZnCl 2 -loaded activated carbon for ammonia adsorption via hydrothermal carbonization and KOH activation, focusing on the effect of the chemical components (cellulose, xylan , pectin, and lignin) on the physicochemical properties and adsorption performance of activated carbon. For raw activated carbon in moist conditions, ammonia was mainly adsorbed in the form of Lewis/Brønsted acid-base (37.8 mg/g), followed by the ZnCl 2 coordination compound and organic amine forms (22.3 mg/g). Lignin-added activated carbon had the highest adsorption capacity , 91.2 mg/g in moist conditions, followed by cellulose-added and xylan-added activated carbon. The presence of lignin was beneficial for the formation of the phenolic group of activated carbon (increased by 111.3%), which promoted ammonia adsorption in the form of Lewis acid-base, especially in dry condition. Cellulose and xylan enhanced the formation of carboxylic (i.e., increased by 53.0% for cellulose) and lactonic groups (i.e., increased by 73.4% for cellulose) of activated carbon, leading to an increase of ammonia adsorption in the form of Brønsted acid-base and organic amines in moist conditions. The results illustrated the detailed effect of the chemical components in the feedstock on the ammonia adsorption styles, which could guide the selection of appropriate materials to prepare activated carbon for highly efficient ammonia adsorption under various situation.
研究领域:
环境科学
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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 COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Xueying Fan,Wen Zhang,Yongsheng Xu,Jie Zheng,Yang Li,Xiaobin Fan,Fengbao Zhang,Junyi Ji,Wenchao Peng
Tailoring the porous structure of carbon materials is one essential approach to improve the energy storage performance of carbon-based electrode materials . Herein, hierarchical porous carbons (HPCs) with different meso -structure are synthesized via a one-pot pyrolysis process with SiO 2 and ZnCl 2 as template and activator, respectively. The energy storage capacities of the obtained HPC samples are investigated as bi-functional electrode both for supercapacitor and LIBs . The results show that different meso -structure of HPCs can effectively affect the energy storage performance. In the range of 15 ∼ 50 nm, smaller size of mesopore can result better electrochemical performance of HPCs. And the optimized HPC sample (HPC-15) manifests high specific capacitance of 432F g −1 and good cyclic stability in the supercapacitor application. When used as anode of LIBs, the HPC-15 presents a high capacity of 820 mAh g −1 . In addition, COMSOL simulation is employed to study the effect of pore structure on mass transfer during electrochemical process. The HPC-15 is calculated to have the highest total porosity (ε p ) and effective diffusivity of K + (D e = 6.776 × 10 -10 m 2 s −1 ), thus leading to its best electrochemical performance.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Lijia Qiu,Xufang Zong,Rongfang Yuan,Beihai Zhou,Huilun Chen,Jia Zhang
In this study, graphene-like biochar (IZBC) was prepared by pyrolysis of wheat straw in the presence of catalyst and activator. The formation of graphene in IZBC could be divided into three stages: shell core generation, carburization, and carbon precipitation. When the pyrolysis temperatures were in the ranges of 500–600 ℃, 600–700 ℃, 700–800 ℃ and 800–900 ℃, 17%, 32%, 13% and 38% of graphene were produced, respectively. The contribution ratios of graphene by FeCl 3 , ZnCl 2 and HCl were 64%, 23% and 13%, respectively. Moreover, IZBC was filled with porous wavy three-dimensional graphene nanosheets that enabled self-aggregation to be effectively prevented, which was superior to the striped two-dimensional structure. The adsorption of IZBC for dimethoate was a spontaneous exothermic reaction with the adsorption capacity of 980 μmol/g, which was consistent with the pseudo-second-order and intraparticle diffusion models. The adsorption was inhibited by coexisting cations, anions, and humic acid in water. Dimethoate was adsorbed on graphene through embedded separation, with pore filling, cation- π and electrostatic attraction as the key driving forces. In addition, the adsorbed saturated IZBC could be effectively regenerated for many times by 2 mol/L HCl solution.
研究领域:
环境科学
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材料科学
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化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Mengting Zhang,Xuejia Huang,Jiejun Li,Yuhong Li,Pengcheng Zhao,Junjie Fei,Yixi Xie
Baicalin (Bn) is the main component of the Chinese patent medicine Baicalin Tablet which is used for the auxiliary treatment of acute, chronic hepatitis and persistent hepatitis. Herein, an ultrasensitive electrochemical sensor was manufactured based on the nitrogen and zinc double doped carbon nanospheres(ZnN-CNS) derived from γ-cyclodextrin self-assembled supermolecules with ZnCl 2 . The sensing nanomaterials were characterized and investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), raman spectroscopy (RS), and scanning electron microscopy (SEM), etc. Under the optimized optimal environment, the linear detection range of the prepared sensor for Bn was ranged from 1 × 10 −8 to 7.5 × 10 −7 M, where the LOD was 7.17 × 10 −8 M with a sensitivity of 220 A/M. Good accuracy and desirable recovery results for the detection of Bn in real samples (Bear bile scutellaria eye drops and Shuanghuanglian oral liquid) were also observed. This work provides a new idea about the detection of Bn as well as the application of novel binary doped carbon materials .
研究领域:
分析化学
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纳米技术
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药学
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材料科学
✓ 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）