CARBON
·
2017
·
IF 6.337
Qi Li,Dan Xu,Jiangna Guo,Xu Ou,Feng Yan
Preparation of high-performance carbon materials with an abundance of heteroatoms, edges, and defects for sustainable energy-conversion technologies, such as supercapacitors and oxygen reaction reduction (ORR), are still a challenge. Herein, we reported a facile strategy for the large-scale synthesis of nitrogen-doped porous carbon via carbonization of core-shell structured protonated g-C 3 N 4 @polypyrrole (P- g -C 3 N 4 @PPy) nanocomposites . Polypyrrole provided both the carbon and heteroatom sources, while P-g-C 3 N 4 acted not only as a sacrificial template but also as nitrogen sources. Porous carbon derived from P-g-C 3 N 4 @PPy (denoted as PCN@PPy-C-900) exhibited a specific capacitance of 350 F g −1 at a current density of 5 A g −1 and a high-rate capability (320 F g −1 ) at 20 A g −1 in 6 M KOH aqueous solution, as well as good long-term stability after 1000 cycles. In addition, PCN@PPy-C-900 also displayed excellent electrocatalytic performances in ORR in 0.1 M KOH aqueous solution. The excellent electrochemical performances provide guidance for the structure design of this promising class of multifunctional carbon-based materials which can be large scale applied to supercapacitors, ORR, and other fields.
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Water
·
2024
·Vol. 16
·期 18
·2689
·
IF 3
Kaili Huang,Haiqing Huang,Xuhui Huang,An Lao,Zheng Zheng,Hanqi Wu
Disinfection by-products (DBPs) such as chloroacetic acids (CAAs) and N-Nitrosodimethylamine (NDMA) are prevalent pollutants in surface waters, particularly with the increasing use of chlorine-based disinfectants. The entry of these DBPs into water bodies may increase accordingly, posing ecological risks to aquatic life. To assess the toxic effects of CAAs and NDMA on submerged macrophytes,Vallisneria natanswas exposed to different concentrations of CAAs (1.0, 10.0, and 100.0 μg L−1) and NDMA (0.1, 1.0, and 10.0 μg L−1). A RI value of <1 indicates that simultaneous exposure to CAAs and NDMA can produce an antagonistic effect. Both CAAs and NDMA adversely affect the photosynthetic system of plants. In the NDMA treatment group, chlorophyll a content decreases with increasing concentration, accounting for 96.03%, 60.80%, and 58.67% of the CT group, respectively. Additionally, it effectively triggers the plant’s antioxidant response, with significant increases in SOD, POD, and GSH levels. Among these, the combined treatment group AN2 (10 + 1 μg L−1) showed the most significant change in SOD activity, reaching 3.57 times that of the CT group. Ultrastructural changes also revealed stress responses in leaf cells and damage to organelles. Furthermore, metabolomics provided insights into the metabolic responses induced by CAAs or NDMA inV. natansleaves, where the composition and metabolism of lipids, fatty acids, cofactors and vitamins, amino acids, nucleotides, and some antioxidants were regulated, affecting plant growth. This study provides preliminary information for the ecological risk assessment of submerged plants by complex contamination with the disinfection by-products CAA and NDMA.
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Energy Technology
·
2025
·
IF 3.6
Yueqin Zhao,Yuxin Sun,Liuyun Chen,Xianjun Yang,Pengfei Yang,Xinling Xie,Zuzeng Qin,Hongbing Ji,Tongming Su
Photocatalytic hydrogen production from water splitting is a promising technology for overcoming energy and environmental issues. Herein, Mn 0.4 Cd 0.6 S/CuS composites were constructed for photocatalytic hydrogen production. The amount of CuS is optimized, and the composition and structure of the Mn 0.4 Cd 0.6 S/CuS composite are investigated via various characterization techniques. The formation of a p–n heterojunction between Mn 0.4 Cd 0.6 S and CuS and the built-in electric field improve the separation efficiency of photogenerated electrons and holes and enhance the performance of photocatalytic hydrogen production. When the content of CuS is 5 wt%, Mn 0.4 Cd 0.6 S/5CuS presents the best photocatalytic hydrogen production rate of 22.10 mmol h −1 g −1 , which is 3.0 times greater than that of Mn 0.4 Cd 0.6 S, and the apparent quantum yield reaches 7.82% at 400 nm. Combined with the activity test and characterization results, the reaction mechanism of photocatalytic hydrogen production over the Mn 0.4 Cd 0.6 S/CuS composite is proposed.
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Biomass Conversion and Biorefinery
·
2024
·
IF 3.5
Jiang Ruiting,Yang Guang
The cost-effectiveness and renewability of biomass-derived carbon spheres have important advantages for wide application, yet efficient synthesis methods and green activation studies are still challenging. Here, hemicellulose from corncobs was extracted, and then N 2 plasma technology was used to modify the carbon spheres produced from hemicellulose in a single process. The effect of hydrothermal reaction parameters on the yield of carbon spheres was investigated, and the optimal preparation conditions were determined with solid–liquid ratio of 1:10 (g/mL), reaction time of 12 h, and pH of 1.5. The modified carbon spheres featured 3.02% nitrogen content and mesoporous structure. As an anode material for a lithium-ion battery, the modified sample has a specific capacity of 232.1 mAh g −1 after 50 cycles at 0.1 A g −1 . In this study, biomass-derived carbon spheres containing multifunctional groups were prepared under green and mild conditions, and this innovative process provides an effective basis for the sustainable utilization of biomass.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Shumail Farhan,Asif Hassan Raza,Songyu Yang,Zhixian Yu,Yan Wu
The advancement of highly effective heterojunction photocatalysts with improved charge separation and transfer has become a crucial scientific perspective for utilizing solar energy. In this study, we developed the S-scheme heterostructure by depositing N-doped CeO 2-δ (NC) nanoparticles onto two-dimensional ZnIn 2 S 4 (ZIS) nanosheets via hydrolysis strategy for significantly enhanced photocatalytic hydrogen evolution reaction. The optimal H 2 generation rate of ∼ 798 μmol g –1 h –1 was achieved for NC-3@ZIS under solar light irradiation, which is about 18 and 2 times higher than those of pristine CeO 2 (∼44 μmol g –1 h –1 ) and ZIS (∼358 μmol g –1 h –1 ), respectively. The photogenerated electrons from NC interact with the photogenerated holes of ZIS driven by an internal electric field, confirmed by In-situ KPFM, DFT calculation, and XPS results. According to EPR and photoelectrochemical measurements, NC-3@ZIS composite shows dramatically high separation efficiency of photogenerated charge carriers. This study provides a new approach for developing non-noble metal S-scheme heterojunctions with enhanced photocatalytic hydrogen evolution.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Kexin Zhao,Jingsen Zhang,Hong Li,Xiuling Zhang,Yue Hua,Lanbo Di
Developing highly-efficient and stable Pt-based catalysts towards alkaline hydrogen evolution reaction (HER) offers a promising strategy for future renewable energy. In this work, radio-frequency (RF) cold plasma-prepared N-doped MWCNTs were adopted to support Pt nanoparticles (NPs) (Pt/NCNTs) via pretreating MWCNTs with RF nitrogen plasma and combining with traditional thermal reduction method. The as-synthesized Pt/NCNT featured an ultra-small size of Pt NPs (1.5 nm) and plentiful doped nitrogen, exhibiting ultra-low overpotential of 28 mV@10 mA cm −2 and ultra-high mass activity of 3.2 A mg Pt −1 @100 mA in 1 M KOH solution, which are superior to those of commercial 20 wt% Pt/C catalyst. This is because RF plasma can realize fast, high-efficient and specific N-doping structure of MWCNTs. The lone electron pairs of N species (mainly pyri-N and pyrr-N) on MWCNTs surface transfer to the empty orbitals of Pt NPs, forming a strong coordination effect between Pt and nitrogen, thereby boosting the alkaline HER catalytic performance.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xueyun Yang,Jianhao Zhu,Yingli Wang,Jiacun Wang,Yajuan Li,Yuanxiang Gu,Qingliang Lv,Lei Wang
Despite the ultrahigh theoretical energy density and cost-effectiveness, aprotic lithium-oxygen (Li-O 2 ) batteries suffer from slow oxygen redox kinetics at cathodes and large voltage hysteresis. Here, we well-design ultrafine Co nanoparticles supported by N -doped mesoporous hollow carbon nanospindles (Co@HCNs) to serve as efficient electrocatalysts for Li-O 2 battery. Benefiting from strong metal-support interactions, the obtained Co@HCNs manifest high affinity for the LiO 2 intermediate, promoting formation of ultrathin nanosheet-like Li 2 O 2 with low-impedance contact interface on the Co@HCNs cathode surface, which facilitates the reversible decomposition upon charging. The mesoporous hollow nanospindles can provide abundant electron/ions transport channels to synergistically accelerate the formation and decomposition of discharge products. The Li-O 2 battery based on Co@HCNs displays remarkably reduced discharge/charge polarization of 0.92 V, impressive rate performance, and stable operation for 250 cycles. This work will provide a new avenue to design advanced oxygen electrocatalysts for high-performance Li-O 2 battery.
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SURFACE & COATINGS TECHNOLOGY
·
2012
·
IF 1.867
Guoxin Hu,Bo Tang,Xia Min
By using layer-by-layer self-assembly technology, multilayered films consisting of alternated humic acid and Fe 3 + ions ((HA/Fe 3 + ) n , n = 10,20,40) were fabricated on alumina fiber (AF) substrate for the first time. FTIR and FESEM results show that the (HA/Fe 3 + ) n thin films were effectively immobilized on the AF surface. The average thickness of a single bi-layer HA/Fe 3 + is not sensitive to the total layers. On the contrary, the concentration of Fe 3 + ions significantly influences this mean thickness. A loose and amorphous structure with some irregular pores was detected from the as-prepared specimens, while relatively smooth surface and denser structure were observed after carbonized at 1000 °C. The large BET surface areas and excellent absorbability of the as-prepared and carbonized samples were found. Moreover, at room temperature, a ferromagnetic property of these samples was revealed by magnetism testing. Due to the adjustable number of layers, the ferromagnetic property is controllable. Therefore, these produces possess potential application as the support material in catalytic and target drug delivery areas.
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NEURON
·
2024
·
IF 14.7
Xinyi Zhou,Qian Xiao,Yaohui Liu,Shuai Chen,Xirong Xu,Zhigang Zhang,Yuchuan Hong,Jie Shao,Yuewen Chen,Yu Chen,Liping Wang,Fan Yang,Jie Tu
Assessing and responding to threats is vital in everyday life. Unfortunately, many mental illnesses involve impaired risk assessment, affecting patients, families, and society. The brain processes behind these behaviors are not well understood. We developed a transgenic mouse model (disrupted-in-schizophrenia 1 [DISC1]-N) with a disrupted avoidance response in risky settings. Our study utilized single-nucleus RNA sequencing and path-clamp coupling with real-time RT-PCR to uncover a previously undescribed group of glutamatergic neurons in the basolateral amygdala (BLA) marked by Wolfram syndrome 1 (WFS1) expression, whose activity is modulated by adjacent astrocytes. These neurons in DISC1-N mice exhibited diminished firing ability and impaired communication with the astrocytes. Remarkably, optogenetic activation of these astrocytes reinstated neuronal excitability via D-serine acting on BLA WFS1 neurons’ NMDA receptors, leading to improved risk-assessment behavior in the DISC1-N mice. Our findings point to BLA astrocytes as a promising target for treating risk-assessment dysfunctions in mental disorders.
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ACS Omega
·
2024
·
IF 3.7
Zuwu Tang,Yuqing Yang,Yuwei Pan,Meiqiong Yu,Xinxing Lin,Ajoy Kanti Mondal
Hydrogels have drawn intensive attention as fascinating materials for biomedicine. However, fabricating hydrogels with injectable and self-healing properties remains a challenge. Herein, we reported a biocompatible poly(N-vinylpyrrolidone)/carboxymethyl cellulose (PVP/CMC) hydrogel with excellent injectable and self-healing properties. The PVP/CMC hydrogel exhibits good biocompatible, injectable, and self-healing properties. The sol–gel transition of PVP/CMC hydrogels demonstrates an outstanding self-healing behavior, and the bisected hydrogels can self-heal within 30 s. The hydrogels have a good swelling ratio, and the swelling ratio increases with increasing amount of CMC in PVP and reaches a maximum of 2850% at a 1.0:1.5 PVP and CMC ratio. In addition, the hydrogel possesses excellent drug release capacity, and its drug release rate reaches 70%. Moreover, the release of 4-aminosalicylic acid (4-ASA) in the hydrogel can be controlled by adjusting the proportion of the hydrogel. The PVP/CMC hydrogel with excellent biocompatible, injectable, and self-healing properties has great potential for applications in drug release.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2015
·
IF 7.435
Renfeng Nie,Meng Miao,Weichen Du,Juanjuan Shi,Yingchun Liu,Zhaoyin Hou
In this work, N-doped reduced graphene oxides (NRGO) was synthesized via a facile urea-hydrothermal treatment of graphene oxide and used as support for ultrafine Pd nanoparticles (NPs). It was found that N in NRGO can improve the dispersion of Pd NPs. NRGO supported Pd catalyst (Pd/NRGO) is highly active and selective for the hydrogenation of C C bond in cinnamaldehyde and hydrogenation of phenol to cyclohexanone under mild conditions. X-ray diffraction, X-ray photoelectron spectra and transmission electron microscopy characterizations confirmed the interaction between NRGO and Pd enhanced with the amount of N atom in NRGO. Raman spectroscopy of adsorbed cinnamaldehyde on Pd/NRGO suggested that NRGO played a positive role in the selective activation of C C bond in cinnamaldehyde.
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Nanoscale
·
2015
·Vol. 7
·期 28
·11956-11961
·
IF 7.394
Wenxiu Yang,Xiaoyu Yue,Xiangjian Liu,Junfeng Zhai,Jianbo Jia
A highly efficient N, S co-doped porous carbon ORR catalyst was simply designed in our report from ordered mesoporous carbon (OMC) and trace ionic liquids (ILs). The microstructure OMC was chosen as the template for improving the specific area, confining the ILs in the mesopores, and promoting the formation of the planar N and S doping. The resulting IL/OMC (IOMC) nanostructure exhibits comparable ORR activity and better stability than the commercial Pt/C catalyst in 0.10 M KOH solution, which makes it one of the best-performing metal-free carbon ORR catalysts. We deduced that the excellent ORR activity is attributed to the synergistic effect of N, S, and the ordered mesoporous structure. Interestingly, the ORR activity can be further boosted in both basic and acidic solutions after Fe doping into the IOMC nanostructures which clearly emphasizes that transition metal Fe is important for the construction of ORR active functional sites especially in acidic solution.
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