MOLECULES
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2023
·Vol. 28
·期 5
·2228
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IF 4.6
He Wang,Lan Yao,Hongmei Zuo,Fangtao Ruan,Hongjie Wang
Porous carbon nanofibers (PCNFs) with excellent physical and chemical properties have been considered candidate materials for electrodes used in supercapacitors. Herein, we report a facile procedure to fabricate PCNFs through electrospinning blended polymers into nanofibers followed by pre-oxidation and carbonization. Polysulfone (PSF), high amylose starch (HAS), and phenolic resin (PR) are used as three different kinds of template pore-forming agents. The effects of pore-forming agents on the structure and properties of PCNFs have been systematically studied. The surface morphology, chemical components, graphitized crystallization, and pore characteristics of PCNFs are analyzed by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and nitrogen adsorption and desorption test, respectively. The pore-forming mechanism of PCNFs is analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Fabricated PCNF-R have a specific surface area as high as ~994 m2/g, a total pore volume as high as ~0.75 cm3/g, and a good graphitization degree. When PCNF-R are used as active materials to fabricate into electrodes, the PCNF-R electrodes show a high specific capacitance ~350 F/g, a good rate capability ~72.6%, a low internal resistance ~0.55 Ω, and an excellent cycling stability ~100% after 10,000 charging and discharging cycles. The design of low-cost PCNFs is expected to be widely applicable for the development of high-performance electrodes for an energy storage field.Keywords:porous carbon nanofiber;polymer;blend;electrode material;supercapacitor
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Siyu Zhang,Xinpeng Zhao,Xinqi Guo,Gaoqi Zhang,Tianchong Li,Shiyu Xu,Yufu Zhao,Jian Li,Shouxin Liu,Zhijun Chen,Shujun Li,Chenhui Yang
Producing electricity via microorganisms is promising as a sustainable and inexpensive energy source. However, most of the reported classical electroactive microorganisms are unusual in the environment, hindering their practical application. Here, we used carbon dots (CDs) to boost the power generation of common but nonclassical electroactive microorganisms, such as Escherichia coli and Staphylococcus aureus , in the natural environment. The CDs, which have good biocompatibility and high electron transfer efficiency, are taken up by bacterial cells and enable electrons to migrate rapidly to the ambient electrode because of the formation of robust electron transfer networks. The CDs promote electrochemical redox activity and increase the internal charge generation, and reduce the electrochemical impedance of the bacteria. As a result, the CDs facilitate rapid and high power generation in the microbial chemical cells and microbial fuel cells, with a nearly 94-fold and 172-fold improvement in current and power output compared with unmodified Escherichia coli . This work offers an important strategy for enhancing the generation of bioelectricity and facilitates the functional optimization of technologies that depend on microbial electron transfer.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shuaibing Fang,Jingxi Zhang,Yifan Niu,Shaohua Ju,Yongwan Gu,Kai Han,Xiaoxi Wan,Na Li,Yu Zhou
In this study, A green reducing agent green tea extract is used instead of traditional sodium borohydride and porous activated carbon was supported to prepare nano-zero valent iron (nZVI) combined with sulfate (GT-PAC-nZVI/S) to remove Nitrate Nitrogen (NO 3 – -N) in wastewater. SEM-EDS, BET, XRD and FTIR characterization results confirmed that effective preparation of porous and high specific surface area and successful loading of sulfide nZVI on PAC. Batch experiments were conducted to measure the effects on the removal of nitrate nitrogen of different parameters including pH, temperature, dosage, interfering agents, carbon-iron ratio and iron-sulfur ratio. The experimental results demonstrate that GT-PAC-nZVI/S has a high nitrate nitrogen removal rate and reduction product gaseous nitrogen can reach 93.00% and 22.10%, respectively, at pH = 7, the dosage of GT-PAC-nZVI/S = 4 g/L, temperature of 60 ℃, iron-sulfur ratio = 1:0.3 and time of 95 min. And interfering ion HPO 4 2- have the strong inhibition for NO 3 – -N degradation. The adsorption isotherm and kinetic data for GT-PAC-nZVI/S was fitted well with the Langmuir and pseudo-second order model, respectively, indicating that the adsorption process for nitrate was chemisorption. Furthermore, GT-PAC-nZVI/S enhanced the removal of nitrate nitrogen through complexation, redox, and adsorption co-precipitation. This work highlights the efficient remediation of nitrate-nitrogen water pollution by porous activated carbon loaded with sulfide nZVI.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2023
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IF 3.8
Jingxia Wang,Xiaohan Shan,Qiang Xue,Yao Liu,Zeyu Liu,Lin He,Xiaolei Wang,Changchun Zhu
In this work, we firstly developed a laser-induced graphene (LIG) electrode modified by gold nanoparticles (AuNPs) and glycine-modified nanocarbon (Gly-C), and used it to detect nitrite by linear scanning voltammetry . The physical and electrochemical characteristics of the electrodes were characterized using scanning electron microscopy, energy dispersive spectroscopy analysis, fourier transform infrared spectroscopy , and contact angle analysis. Our findings demonstrated that the electrocatalytic oxidation of nitrite can be enhanced by the successful loading of AuNPs, and Gly-C enhances electrode hydrophilicity and promotes nitrite adsorption capacity of the electrode surface. Under optimal conditions, the linear of the sensor is 7 ∼ 700 μg/L and 700 ∼ 1050 μg/L, and the detection limit is 0.84 μg/L. The anti-interference, repeatability, and stability of this sensor are outstanding. Recovery rates of the sensor in the actual groundwater and tap water varied from 94 to 123 %, and the relative standard deviation was less than 6.06 %. Our findings offer a potentially effective method for on-site monitoring of nitrite in aquatic environments.
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 17
·7957-7960
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IF 3.3
Zhicheng Luo,Zhiguo Zhu,Lupeng Han,Rui Xiao,Dawang Chu
WOx/ZrO2 is effective in the hydrogenolysis of cellulose to C3 products but the active sites on the W–Zr interfaces are hardly controlled. Herein, we prepared WOx/ZrO2 catalysts with active WOx species by simply varying the reduction temperatures, which selectively achieved C3 alcohol formation. A series of characterizations showed that increased reduction temperatures (400–600 °C) led to the formation of more dispersed WOx, while higher reduction temperatures (>600 °C) contributed to producing aggregated WO3 and W2C. At 600 °C, the dispersity of WOx peaked with a W5+/∑Wn+ ratio of 19%, providing abundant Lewis acid sites and oxygen vacancies (Vo), which were the active sites for glucose isomerization to fructose and C–C cleavage of fructose. A selectivity of 48% for C3 alcohols was obtained over the optimized WOx/ZrO2(600 °C) + Ru/AC catalyst.
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Journal of Energy Storage
·
2023
·
IF 9.4
Zhongtai Lin,Xue Li,Shengnan Li,Bin Li,Jianxu Ding,Yongqin Han,Tingxi Li,Chunping Hou,Yong Ma
Layered double hydroxide (LDH) has become one of the prospective electrode materials due to high specific area, good cycle stability and high power density. However, large internal resistance limits its application in energy storage. The introduction of materials with high electrical conductivity is expected to solve this problem. In here, carbon cloth/MXene/PANI/CoNi-LDH (CC/MXPACN) composites are fabricated by the electrodeposition of PANI and CoNi-LDH on the CC coated with MXene . The effects of electrodeposition time on the electrochemical performances are investigated in detail. The asymmetric supercapacitor is assembled with CC/MXPACN as the positive electrode and activated carbon (AC) as the negative electrode . The device has a 1.6 V voltage window. After 10,000 cycles at a current density of 5 A g −1 , the capacitance retention rate is still 91 %. At the power density of 399.95 W kg −1 , the energy density of 39.33 Wh kg −1 is provided. Even at the high power density of 2400.35 W kg −1 , the energy density can still reach 27.27 Wh kg −1 . The asymmetric device has high specific capacitance, long-term stability and good power density and energy density, which exhibit a huge potential in energy storage applications .
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JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Aidong Tan,Youwei Wen,Jinghua Huang,Kai Wan,Zhiyong Fu,Xinbo Zhang,Zhenxing Liang
Electroactive organics with multiple redox centers have advantage to realize high capacity and energy density of lithium-ion batteries (LIBs). Herein, a novel multiredox organic molecule, viz . 2,4,6-tri(4-pyridyl)-1,3,5-triazine (TPT), is developed by densely assembling active sites in one molecule, which yields reversible four-electron storage and a high capacity of 347 mA h g −1 TPT at 0.10 A g −1 in carbonate electrolyte. Battery test reveals a superior cyclability with a capacity retention of 66% after 6000 cycles at 2.0 A g −1 and rate performance. Physiochemical characterizations and theoretical calculation are extensively performed to clarify the superior capacity and stability. Physicochemical characterizations reveal that the TPT evolves to diradicals upon accepting two electrons, and the quinoid structure upon accepting four electrons. The effective delocalization of the four charge over the four aromatic rings can remarkably stabilize the organic molecule against side reactions. The formation of a cathode electrolyte interface film contributes to the high cyclability during the battery test. The capacitive response of TPT is recognized as the dominant proportion in capacity, which contributes to the superior rate performance. This work offers an effective strategy on the rational design of high-capacity and stable organic cathode materials for LIBs.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 15
·8110-8118
·
IF 11.9
Jiangchao Huang,Veronica Pereira,Chenyue Wang,Haitao Li,Hiang Kwee Lee,Jie Han
The efficient utilization of low-grade thermal energy to produce clean water or electricity is important because it potentially relieves our demand on limited natural water and energy resources. Here, we propose a dual-functional device to couple solar-driven water evaporation and evaporation-induced power generation for concurrent production of clean water and green electricity. Our strategy involves the fabrication of an asymmetric, dual-layered structure by spraying a carbon black/polyvinylidene fluoride mixture onto bamboo filter paper (CB/PVDF@BFP). The upper CB/PVDF layer serves as a light-to-thermal transducer for instantaneous heating, while the bottom BFP layer functions as a hydrophilic porous platform to boost water uptake and transfer. Moreover, water evaporation drives capillary flow of ions on the conductive CB/PVDF layer to create a pseudostream that can be harnessed for power generation. Notably, our dual-functional device delivers a fast water evaporation rate of 1.44 kg m−2 h−1 and a high energy utilization rate of 92% under one sun, beyond the previous carbon-based reports. Through this solar-driven water evaporation process, we achieve the efficient desalination of artificial seawater and decontamination of organic-polluted water by up to 99.8% and nearly 100%, respectively. Our device also concurrently produces high, consistent evaporation-induced electrical outputs with VOC and ISC of 0.32 V and 1.5 μA, respectively. The generated electrical outputs can be easily stored by charging a capacitor to over 1.5 V within 15 minutes and be subsequently utilized on demand to power common household electronics. By enabling the efficient coupling of multiple solar-driven processes, our work will catalyze the design of next-generation multifunctional devices to ensure electricity and potable water are easily accessible by everyone, especially remote areas without power stations and/or water treatment facilities.
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CARBOHYDRATE POLYMERS
·
2023
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IF 11.2
Hengye Li,Xingwei Han,Wenjie Yu,Lin Zhang,Wenwen Bie,Meijie Wei,Zhongxia Wang,Fenying Kong,Wei Wang
Herein, through knitting benzylated β-cyclodextrin (BnCD) by dimethoxypillar[5]arene (P[5]), porous copolymers (P[5]-BnCDs) containing two kinds of macrocycles were synthesized with yields not <97 %. The molar ratio of P[5]/BnCD greatly influenced the P[5]-BnCDs' porosity and adsorption performance. When the molar ratio of P[5]/BnCD was 4/1, the P[5]-BnCD (4-1), demonstrated a surface area up to 515.95 m 2 /g and showed fast adsorption kinetic , high adsorption capacity and good reusability towards the model organic micropollutants (OMPs). The adsorption fitted well with the pseudo-second-order and the Langmuir models, while the thermodynamic studies revealed spontaneous physisorption process. The adsorption mechanism was dominant by host-guest and hydrophobic interactions and the adsorption at environmentally relevant concentrations experiments showed the practicality and superiority in extraction of the OMPs at μg/L level. This study paves a way for the development of versatile porous organic polymers with multiple macrocycles for efficient removal of OMPs from water.
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INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Si Hong,Peng-Fei Wang,Ming-Zhao Xiao,Xiao-Jun Shen,Jia Liu,Xue-Fei Cao,Tong-Qi Yuan
Deep eutectic solvent (DES) pretreatment of lignocellulose is an appealing and green approach for efficient lignin extraction. However, the process of lignin regeneration and DES recovery was time-consuming and labor-intensive. Herein, without any separation and purification after the DES pretreatment of Eucalyptus , the lignin/DES mixture was firstly used to fabricate hierarchical porous carbon materials through DES-thermal carbonization (DTC) and activation. Results revealed that the DTC processing involved degradation, condensation, aromatization, and aggregation, which significantly improved the carbonization degree and thermostability of carbon materials. X-ray photoelectron spectroscopic results confirmed the introduction of nitrogen atom from the choline chloride/lactic acid DES into the fabricated carbon materials during the DTC processing. This phenomenon can generate extra pseudocapacitance and thus increase the specific capacitance of supercapacitors. The capacitance retention of the resultant porous carbon materials (AC-200–12) reached above 95% after 10,000 charge-discharge cycles, which was much superior to commercial activated carbon. This facile and sustainable methodology overcomes traditional complex and expensive methods for preparing carbon materials from hardwood, which show promising potential to be used as electrode materials in a supercapacitor.
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BIORESOURCE TECHNOLOGY
·
2023
·
IF 11.4
Shuang Zhang,Weijie Guan,Haishu Sun,Pan Zhao,Wanqing Wang,Ming Gao,Xiaohong Sun,Qunhui Wang
Microbial electrolysis cell-assisted thermophilic anaerobic digestion (MEC-TAD) is a promising method to improve anaerobic co-digestion efficiency; however, its application is restricted by high energy consumption. To improve the energy use efficiency of MEC-TAD, this study investigated the effect of different intermittent energization strategies on thermophilic co-digestion performance. Results revealed that an 18 h-ON/6h-OFF energization schedule resulted in the fastest electron transfer rate and the highest methane yield (364.3 mL/g VS). Mechanistic analysis revealed that 18 h-ON/6h-OFF resulted in the enrichment of electroactive microorganisms and increased abundance of enzyme-coding genes associated with energy metabolism ( ntp , nuo , atp ), electron transfer ( pilA , nfrA2 , ssuE ), and the hydrogenotrophic methanogenic pathway. Finally, energy balance analysis revealed that 18 h-ON/6h-OFF had the highest net energy benefit (2.52 kJ) and energy conversion efficiency (110.76 %). Therefore, intermittent energization of MEC-TAD using an 18 h-ON/6h-OFF schedule can provide improved performance and more energy savings.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Runze Wang,Guoqing Li,Yuyao Ma,Tengpeng Wang,Bin Chen,Tao Wei,Dehua Dong
Hybrid direct carbon fuel cells (HDCFCs) are promising to achieve high power density, good fuel-electrode contact, and high carbon-fuel conversion efficiency due to increased reaction sites and hybrid routines of carbon utilization. However, the performance of HDCFC is greatly restricted by mass transfer and detrimental carbon deposition . The so-called CO–CO 2 shuttle process, i. e., the coupling of the electrochemical reaction of CO to CO 2 and subsequent discharge of CO 2 towards the C fuel surface for gasification, is the key mass transfer process needed to be optimized. This study demonstrates a novel high-performance HDCFCs anode by integrating C-gasification tandem catalysis in dendritic channel anode support ( t -HDCFCs), which greatly enhances the CO–CO 2 shuttle and mitigates carbon deposition. As a result, the t -HDCFC delivers a comparable or even higher electrochemical performance than the other HDCFCs under the same operation conditions, such as a peak power density of 556 mW cm −2 at 750 °C.
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