INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Shaolong Wu,Liujing Li,Linling Qin,Zhongyuan Zhou
Si-based heterojunctions have been intensively employed to reduce the large overpotential of Si single-absorber photoelectrodes in the field of photoelectrochemical (PEC) water splitting, but achievement of high-quality heterojunctions with an appropriate bandgap on the Si nanostructure host remains a great challenge. Herein, the p-Si/n-CdS core/shell nanowire heterojunction photocathode has been achieved by a combination of nanosphere lithography, metal-assisted chemical etching, atomic layer deposition , and chemical bath deposition. Compared to the bare Si nanowire photocathode , the overpotential maintaining a photocurrent density of 10 mA cm −2 for the optimized p-Si/n-CdS core/shell nanowire heterojunction photocathode under AM 1.5G illumination is reduced by 0.93 V, and simultaneously the saturated photocurrent density is increased by 4.4 mA cm −2 . Analyses indicate that the introduced CdS shell can greatly facilitate the separation and transfer of the photogenerated carriers , as well as partly enhancing the optical absorption .
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高影响因子
CARBON
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2017
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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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CATALYSIS LETTERS
·
2024
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IF 2.3
Yang Zimin,Feng Lianggang,Pang Yongyu,Chai Guoliang
The ever-growing demand for hydrogen peroxide (H 2 O 2 ) makes large-scale production via environmentally-friendly strategies necessary. The electrochemical oxygen reduction reaction stands out as an efficient and green approach for H 2 O 2 production. Here, nitrogen-doped mesoporous carbon materials (NMCM) with a hollow semispherical morphology are synthesized for H 2 O 2 generation, which exhibit remarkable electrocatalytic stability, selectivity (94.5%), and onset potential (~ 0.6 V) toward the H 2 O 2 formation in neutral environment. The distinct H 2 O 2 production performance of NMCM can be attributed to synergistic effect of two factors, that is, the pyrrolic N to optimize the work function and the hollow semispherical morphology to facilitate mass transfer and expose abundant electrocatalytic active sites. This work offers a facile way to prepare metal-free electrocatalysts for realizing high-performance H 2 O 2 production in neutral solutions. Graphical Abstract Nitrogen-doped mesoporous carbon materials with a hollow semispherical morphology and high pyrrolic N contents are synthesized for efficient H 2 O 2 production.
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POLYMER DEGRADATION AND STABILITY
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2024
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IF 6.3
Xi Zhou,Quanzhen Liu,Xueman Chen,Ning Zhou,Guoguang Wei,Feifei Chen,Alei Zhang,Kequan Chen
In this study, we present an efficient and green extraction-pretreatment integrated approach for enhancing enzymatic conversion of chitinous wastes into N -acetyl- d -glucosamine (GlcNAc). Firstly, the enzyme cocktail containing a chitinase Cm Chi1 and a N-acetyl glucosaminase Cm NAGase were constructed for hydrolyzing chitin into sole GlcNAc. Secondly, deep eutectic solvent (DES), consisting of choline chloride and glycollic acid was used to treat chitinous wastes. Under optimal conditions, chitin yield reach to 72 % with a purity of 98 %. Fourier-transform infrared spectroscopy, thermogravimetric analysis, and X-ray diffraction analysis revealed that the crystallinity and thermal stability of the obtained chitin decreased upon DES treatment without alteration of the chemical structure or deacetylation. Finally, the concentration of GlcNAc was increased 2–6 folds by enzymatic hydrolysis of DES-treated chitinous wastes (including shrimp shell, crab shell, ganoderma spores wall, and mycelium). The process provides a promising strategy for degrading chitinous wastes to produce high valued GlcNAc.
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高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2024
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IF 5.7
Jiao Li,Ruiyang Li,Na Shang,Yan Men,Yi Cai,Yan Zeng,Weidong Liu,Jiangang Yang,Yuanxia Sun
The addition of the O-linked N-acetylglucosamine (O-GlcNAc) is a significant modification for active molecules, such as proteins, carbohydrates, and natural products. However, the synthesis of terpenoid glycoside derivatives decorated with GlcNAc remains a challenging task due to the absence of glycosyltransferases, key enzymes for catalyzing the transfer of GlcNAc to terpenoids. In this study, we demonstrated that the enzyme mutant UGT74AC1T79Y/L48M/R28H/L109I/S15A/M76L/H47R efficiently transferred GlcNAc from uridine diphosphate (UDP)-GlcNAc to a variety of terpenoids. This powerful enzyme was employed to synthesize GlcNAc-decorated derivatives of terpenoids, including mogrol, steviol, andrographolide, protopanaxadiol, glycyrrhetinic acid, ursolic acid, and betulinic acid for the first time. To unravel the mechanism of UDP-GlcNAc recognition, we determined the X-ray crystal structure of the inactivated mutant UGT74AC1His18A/Asp111A in complex with UDP-GlcNAc at a resolution of 1.66 Å. Through molecular dynamic simulation and activity analysis, we revealed the molecular mechanism and catalytically important amino acids directly involved in the recognition of UDP-GlcNAc. Overall, this study not only provided a potent biocatalyst capable of glycodiversifying natural products but also elucidated the structural basis for UDP-GlcNAc recognition by glycosyltransferases.
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PubMed
高影响因子
Advanced Electronic Materials
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2025
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IF 5.3
Chan Zhang,Xi Liu,Shaobo Han,Menxing Wu,Runfeng Xiao,Shangzhi Chen,Guangming Chen
Thermoelectric generators are one type of energy device widely used for wearable and flexible electronics to provide power to other devices. Organic aerogels with excellent thermoelectric and mechanical properties are promising candidates for such applications, but most of high-performance organic aerogels are made of p-type materials. It remains a great challenge to develop a low-cost and air-stable n-type organic aerogels with comparable performance with the state-of-the-art p-type counterparts to form an efficient thermoelectric power generator. In this study, a novel strategy based on a cellulose nanofiber skeleton is developed to form a high-performance n-type organic aerogel. The obtained n-type organic aerogels possess a Seebeck coefficient of −17 µV K −1 and can combine with their p-type counterparts to form a generator outputting 1 µW with a temperature difference of 50 K. Using the n-type organic aerogels, dual-parameter pressure and temperature sensing with high precision and reproducibility can be realized. The n-type aerogel will find its applications not only for outdoor self-powered systems, but also for human health diagnosis systems with real-time monitoring of multiple parameters without crosstalk.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2025
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IF 6.3
Sixing Zhang,Guangyao Zhao,Zhen Li,Jianfeng Hu,Zhehui Zhao,Jiakang Yao,Na Cheng,Zhengguo Zhang
Traditional phase change materials (PCMs) offer broad application potential but face challenges such as environmental unfriendliness, high rigidity and poor heat transfer performance, resulting in low utilization efficiency. In this study, using biomass loofah sponge (LS) as the main framework and natural rubber latex (NRL) as the flexible modifier, the biomass-based PCMs (L-N) were successfully synthesized after encapsulating lauric acid (LA). The addition of nano-TiO 2 further enhanced thermal conductivity, ultimately leading to the development of flexible composite PCMs, L-N-Ti. In-depth characterizations revealed that the introduction of NRL significantly improved the system's strength and toughness, with tensile strength peaking at 1.161 MPa at 19.2 % NRL content, while maximum elongation at break reached 38.65 % at 26.3 % NRL. The incorporation of 7.4 wt% TiO 2 significantly boosted thermal conductivity to 0.57 W/(m·K), a 185 % increase over the unmodified material. Simultaneously, the energy storage efficiency (E m ) of L-N-Ti consistently exceeded 89.89 %, with only a 9.34 % loss in latent heat of fusion after 100 thermal cycles, indicating robust thermal stability. The successful advancement of L-N-Ti not only addresses the mechanical constraints inherent but also offers a sustainable biomass-based solution for effective thermal management within the 20°C–60 °C range.
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Food Chemistry-X
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2024
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IF 6.5
Jia Cheng Qian,Heng Peng Zhang,Yi Wang,Dan Liu
Cruciferous vegetables (CVs) are globally consumed with some health benefits believed to arise from indole-3-carbinol (I3C), a labile phytochemical liberated from indole glucosinolates, but few reports describe the effect of cooking on I3C reactions. Here, we present heat-promoted direct conversions of I3C in broccoli florets into indole derivatives, which are unique in the N -indolylmethylation and -hydroxymethylation of indole nuclei by 3-methyleneindole and formaldehyde formed in situ from the I3C dehydration and the dimerization of I3C to 3,3′-diindolylmethane (DIM), respectively. Such N -substituted indoles were found in a range of 0.4–4.6 μg per gram of steamed broccoli florets, with a novel compound N -(indol-3-ylmethyl)-3,3′-diindolylmethane (DIM-1) bio-evaluated to inhibit A375 cells with an IC 50 value of 1.87 μM. In aggregation, the investigation discloses the promoting effect of heating on the I3C transformation in CVs and identifies DIM-1 as an anti-cancer drug candidate, and thus updates the knowledge of I3C and bioactive derivatives thereof.
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PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
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IF 8.3
Ze Li,Wen-Jie Li,Jun Guo,Zi-Yuan Wang,Xing Yang,Yu-Ke Zhu,Tian-En Shi,Yi-Xin Zhang,Jing Feng,Zhen-Hua Ge
SnSe materials have attracted extensive attention in thermoelectrics due to their low thermal conductivity. Nevertheless, the thermoelectric properties of n-type polycrystalline SnSe are still low, and metallic Sn distributed in the SnSe1–x materials would affect the repeatability of thermoelectric performance. Herein, the thermoelectric properties of n-type polycrystalline SnSe0.95-based composites are highly enhanced by heterogeneous Cu doping. The carrier concentration of the SnSe0.95 material was optimized by SnCl2 doping. The strategy of heterogeneous Cu doping is employed in further improving the thermoelectric performance of the SnCl2-doped SnSe0.95 materials. In addition, partial Cu+ doping tunes the electron concentration to enhance the Seebeck coefficient. Moreover, metallic Sn distributed along the grain boundaries can be stabilized by forming Cu6Sn5 alloys, which improve the thermal stability of bulk composites. Excessive Cu particles and SnCl2 precipitates strengthen phonon scattering for lowering the lattice thermal conductivity. Ultimately, a peak ZT of 1.55 is yielded at 773 K in the SnSe0.95–1 wt % SnCl2–1 wt % Cu bulk composite, whose mechanical hardness is also increased. Hence, these results promote a feasible approach to simultaneously enhance the thermoelectric and mechanical properties of n-type SnSe-based composites, which might be worth exploring in other thermoelectric materials.
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高影响因子
Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Shuangshuang Li,Xin Jiang,Chi Zhao,Yuan Ren,Lixin Luo
Biosurfactants combined with bioaugmentation for the remediation of petroleum hydrocarbon-contaminated soils proved to be one of the most effective ways. However, research on lipopeptides combined with bioaugmentation is rare, and the biological mechanisms are undefined. Therefore, the effect of Raoultella planticola and the lipopeptides it produces to restore contaminated soils was investigated using n-hexadecane as a model of petroleum hydrocarbons. After 60 d, n-hexadecane removal rate increased from 31.3% in contaminated soil to 39.9% with R. planticola alone and 59.0% with R. planticola together with 1.0 g intracellular lipopeptide (INLS) and 7.5 g sodium gluconate (SG)/kg dry soil. Meanwhile, the nitrogen and phosphorus components of the soil increased by 13.9% and 8% in the experimental group, respectively. Besides, DHA activity was 6.7 times that of the control group at 28 d, indicating a considerable increase in DHA activity. Microbial community analysis revealed a considerable increase in functional genera of Sphingomonas , Nocardia , Pseudoalteromonas , Povalibacter , Apiotrichum , Pseudallecheria , and Ascodesmis . The amount of fungus in the experimental group was more than 30 times that of the control group after 60 d. Microbial co-occurrence networks showed improved interactions of Firmicutes and Ascomycota, encouraging synergistic cooperation among microbes and thereby accelerating n-hexadecane breakdown. At once, the metabolic pathways ko00071 and ko00980 for n-hexadecane degradation were greatly elevated, indicating that functional genes such as alkane 1-monooxygenase and NADPH-cytochrome P450 reductase were activated. These results implied that combining hydrocarbon-degrading microbial with INLS was a promising bioremediation technique to remove soil petroleum hydrocarbons.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Yingna Chang,Yuxiang Zuo,Jiawei Li,Jindi Wang,Kefan Song,Yu Liu,Rong Xing,Guoxin Zhang
Supportive atomic Zn electrocatalysts exhibit excellent stability for oxygen reduction reaction (ORR) due to their fully occupied d orbitals of Zn, but their catalytic activity is not satisfactory. Whereas heteroatom doping can anchor the Zn atoms to achieve higher Zn loading; and additionally serve as auxiliary sites to enhance the catalytic activity of Zn sites. Herein, we present a method for the synthesis of N, S co-doped carbon with highly dispersed Zn (named Zn-NSC). The ORR activity of the Zn-NSC catalysts is optimized by adjusting the pyrolysis temperature and the atomic structure of the dopant molecules. The optimized Zn-NSC demonstrates significantly enhanced ORR electrocatalytic activity, this is attributable to its highly co-doping of N and S heteroatoms that are adjacent to Zn atoms. Specifically, the Zn-NSC 3 catalyst exhibits remarkable ORR characteristics with excellent onset voltage (0.97 V vs RHE) and half-wave potential (0.87 V vs RHE), surpassing those of Pt/C (0.97 V and 0.85 V, respectively). Additionally, the Zn-NSC 3 can be utilized as efficient cathode for Al-air batteries, achieving a high power density of 119.4 mW cm −2 and satisfactory discharge stability. This work proposes an approach for synthesizing low-cost and efficient ORR electrocatalysts for Al-air battery applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Jiankang Wang,Shuhong Liu,Ping Song,Xiao Zhang,Ying Song,Wanqian Guo,Zhongping Yao
Nanoparticle aggregation and metal ion leaching contribute to the poor cycling stability of nanostructured zero valent copper (ZVC) catalyst for molecular oxygen activation, greatly hindering its industrial application in wastewater treatment. Herein, N doped carbon coated Cu 0 (Cu@CN) catalysts were prepared by using polyvinylpyrrolidone (PVP) modified Cu-MOF as precursor through high-temperature pyrolysis method. The phase structure, surface morphology and microstructure information of as-synthesized catalyst were systematically characterized by XRD, Raman, SEM, XPS and TEM. Norfloxacin (NOR) degradation in Cu@CN/air system showed Cu@CN3-600, prepared by using 0.3 g PVP as N source and pyrolysis temperature of 600 ℃, exhibited excellent catalytic activity and stability as well as universality in treating various organic wastewaters. The removal rate of NOR after 60 min was 96.05 % and meantime total organic carbon (TOC) decreased by 49.80 % under pH 4.0 and 1.2 g/L catalyst. After three cycles, it still maintained 81.53 % removal rate, owing to the protection effect of N doped carbon on active Cu component against its leaching during degradation. The reaction mechanism of Cu@CN3-600 activating O 2 for NOR degradation was deciphered by reactive oxygen species scavenging experiment, electron paramagnetic resonance (EPR) and density functional theory (DFT) calculation. Finally, four possible degradation pathways were proposed by identifying 16 intermediates through liquid chromatography-mass spectrometry (LC-MS) technology. This work can provide a guidance for designing highly efficient Cu-based molecular oxygen activation catalyst for wastewater abatement.
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危险品化学品经营许可证（带存储）