APPLIED SURFACE SCIENCE
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2024
·
IF 6.3
Hua Pan,Xinxing Zhan,Chao Wang,Juan Tian,Zijian Gao,Lingyun Zhou,Yadian Xie,Xin Tong
The interaction between catalysts and supports is recognized as a crucial factor influencing catalytic activity and stability. However, the carbon materials, which have been widely employed as the support at present, encounter challenges including intricate composition and the difficulty of precise control. In this study, the fullerene-derived carbon materials serve as support to electrocatalysts with low platinum. Fullerene-based materials, as the only carbon material with a well-defined molecular structure, have a controllable active site structure, which can provide a reaction model for studying metal-support interactions. Four kinds of fullerene-derived catalysts such as Pt/fullerene, Pt/nitrogen-doped fullerene, Pt/sulfur-doped fullerene, and Pt/phosphorus-doped fullerene, were synthesized. Once the coordination environment of the Pt particles was controlled, thus their catalytic performance was modulated. Despite a platinum loading of only 4.2%, Pt/N-fullerene demonstrates superior oxygen reduction activity and stability compared to commercial Pt/C (20%). Density functional theory calculations show that the introduction of heteroatoms can change the surface charge distribution of fullerenes, in which N-fullerene has a more negative electrostatic potential and can effectively anchor Pt. This research establishes a foundation for understanding the catalysts-support interaction and further precise control of the coordination environment of Pt. This provides new insights for designing efficient ORR catalysts.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Xusen Li,Bingxin Sun,Liwei Lin,Yuanzhe Piao,Guowang Diao,Wang Zhang
This paper proposes a simple and rapid microwave-assisted phosphorus-oxygen doped porous carbon (P/O-PC) preparation strategy is proposed using potassium citrate, Phytic acid (PA), and ethanol under air atmosphere. PA can be used as both a phosphorus source and a microwave absorbing agent. The P/O-PC500–0.75 has a large specific surface area of 905 cm 2 /g. P/O doping introduces defects into the carbon structure, which enhances the capacitance of the porous carbon. The P/O-PC500–0.75 demonstrates excellent capacitance values of 330 F/g and 389.4 F/g in 6.0 M KOH and 1.0 M H 2 SO 4 , respectively (1 A/g). In addition, the symmetrical supercapacitors assembled with the P/O-PC500–0.75 exhibit good electrochemical stability over 5000 cycles at 5 A/g, with a capacitance loss of only 3.6%. This microwave-assisted strategy offers simplicity in operation and low energy consumption, providing a new and efficient pathway to prepare carbon materials in a fast and simple manner.
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ChemSusChem
·
2024
·
IF 7.5
Yu Chen,Yaxue Shen,Zicheng Liu,Mingshuai Yang,Yuqing Zhang,Zihang Niu,Yanlong Wang,Minghui Feng,Zhuojia Shi
Graphical Natural low-melting mixture solvents could be used to achieve mild, safe and efficient recovery of all-solid-state electrolyte and cathode from all-solid-state sodium-ion batteries with high selectivity. Moreover, water is found to be the green and low-cost anti-solvent to precipitate the extracted metal from the leachate with low-energy consumption at room temperature. Spent all-solid-state sodium-ion batteries (ASIBs) containing toxic and precious metal would be produced significantly and lead to resource waste and environmental pollution as the wide application of ASIBs in the near future. Therefore, it is necessary to develop green strategy for recovery of ASIBs. Here, we propose a safe, mild and green strategy to recover toxic and precious metals from cathode/solid electrolyte of ASIBs by using natural low-melting mixture solvents (LoMMSs) with high selectivity and high leaching efficiency. Natural LoMMSs are abundant, natural available, cheap, non-flammable, biodegradable and biocompatible. Results show that natural LoMMSs could leach nearly 100 % Na and achieve superhigh Na/Zr selectivity of up to 58 from ASIBs at mild temperature, outperforming the recycling efficiency and selectivity of lithium-ion batteries cathode. More importantly, we find that water could be used as a green and low-cost anti-solvent to precipitate the extracted metal from the leachate with low-energy consumption at room temperature. This work provides a cost-effective, energy-saving, mild, green strategy for the recovery of cathode/solid electrolyte from spent ASIBs with high safety and high selectivity.
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TALANTA
·
2024
·
IF 5.6
Qingjie Fu,Shuang Liang,Xingguang Su
Choline is mainly supplemented through food intake, lack of choline would result in diseases like liver cirrhosis, hardening of the arteries, or neurodegenerative disorders. The accurate detection of choline is important for human health. Herein, a novel nanowire-like phosphorus/nitrogen co-doped carbon-based iron nanozyme (Fe-NPC) with outstanding oxidase-like activity was synthesized, and the influence of phosphorus doping on oxidase-like activity was explored. Proper phosphorus doping was found to enhance the oxidase-like activity of Fe-NPC by increasing surface defects, promoting iron loading, and modulating chemical environment of central site. The oxidase-like activity of Fe-NPC was successfully applied to colorimetric-fluorescent dual mode detection of choline, and good linear relationship in the ranges of 3–200 μM were achieved with LODs of 1.95 and 1.50 μM, respectively. The fluorescent detection was constructed based on the fluorescence quenching of silicon quantum dots (Si QDs) by quinone-imine. The quenching mechanism was attributed to FRET due to the large spectra overlap, reduced fluorescence lifetime and proper donor−acceptor distance. The successful application to the detection of choline in milk proved the practicability of the proposed sensing method. The oxidase-like properties of Fe-NPC was further used in the degradation of cationic dye methyl blue, high degradation efficiency of 74 % was achieved within 5 min under optimal conditions, proving the enormous potential of Fe-NPC for application in environment protection.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Guo Chenyue,Tang Huajie,Wang Pengfei,Xu Qihao,Pan Haodan,Zhao Xinyu,Fan Fan,Li Tingxian,Zhao Dongliang
Harvesting electricity from ubiquitous water vapor represents a promising route to alleviate the energy crisis. However, existing studies rarely comprehensively consider the impact of natural environmental fluctuations on electrical output. Here, we demonstrate a bilayer polymer enabling self-sustaining and highly efficient moisture-electric generation from the hydrological cycle by establishing a stable internal directed water/ion flow through thermal exchange with the ambient environment. Specifically, the radiative cooling effect of the hydrophobic top layer prevents the excessive daytime evaporation from solar absorption while accelerating nighttime moisture sorption. The introduction of LiCl into the bottom hygroscopic ionic hydrogel enhances moisture sorption capacity and facilitates ion transport, thus ensuring efficient energy conversion. A single device unit (1 cm 2 ) can continuously generate a voltage of ~0.88 V and a current of ~306 μA, delivering a maximum power density of ~51 μW cm −2 at 25 °C and 70% relative humidity (RH). The device has been demonstrated to operate steadily outdoors for continuous 6 days.
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Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 7
·4099-4107
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IF 10.7
Yuankun Wang,Defeng Wu
Sufficient water supply and evaporation interfaces are vital for hydrogels as solar evaporators, which require ingenious structural design, from the networks and porous structure inside the bulk to the surface morphology outside the hydrogel. A chitosan based anisotropic hydrogel with well-regulated surface architecture is reported here. The aligned channels formed inside the bulk via directional freezing ensure water supply, and the ionic crosslinking further improves the mechanical stability of the bulk and also reduces the evaporation enthalpy of the seawater inside the channels. The small vessels radially distributed over the pores of the evaporation surface, together with the large-sized pores, act as a reservoir, promoting salt exchange and water evaporation and on the other hand, as drains of concentrated seawater, favoring the accumulation of a salt shell outside the hydrogel. Thus, as-prepared solar evaporator shows desirable performance (3.86 kg m−2 h−1 evaporation rate and 96.7% conversion efficiency under 1 sun irradiation) and superior salt-collection ability. The evaporation rate can maintain well even after 10 desalination cycles (over 3.5 kg m−2 h−1, in 20% brine). This work gives an eco-friendly solution for clean water production by using chitosan-based hydrogel evaporators and proposes a method of regulating evaporation surface architecture for hydrogel-based evaporators.
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International Journal of Food Engineering
·
2024
·
IF 1.6
Yanlei Li,Yiying Sun,Lin Lu,Zhiming Gao,Yuehan Wu,Dan Yuan,Wenxin Jiang
To obtain rapeseed protein with low phytic acid (PA), soy protein isolate (SPI) was used to investigate the interactions between SPI and PA. The influence of pretreatment (soaking using salt solution and dialysis) of the defatted rapeseed meal on the PA and protein content in the final rapeseed proteins was also studied. The results showed that electrostatic interactions dominated the protein–PA interaction, which was affected by pH and ionic strength. Accordingly, the pH and ionic strength in the soaking medium also influenced the PA remained in the rapeseed proteins. The PA content decreased with the ionic strength (400–800 mM) and relatively low PA was obtained at pH 6.0 (soaking environment). Finally, 52.8 % of the PA have been removed and PA content remained in rapeseed protein isolate (RPI) reached about 0.84 mg/g, at the same time, the protein content was maintained around 86.70 %. Overall, soaking using salt solution and dialysis could be an effective method to achieve high quality rapeseed protein with low PA.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Runfeng Yu,Yunfei Xu,Xuxian Liu,Guoxin Zhang,Huiping Du,Ze Yang,Yaqun Wang
Currently, the utilization of flexible zinc ion batteries offers significant safety advantages for flexible energy storage devices. However, the limited mass-loading of these batteries presents a challenge to their long-term operation in such devices, thereby hindering further advancements. To address this, we present a mechanically flexible zinc-ion battery featuring a screen-printed PANI cathode. This battery achieves high loading and low weight, resulting in an energy density of 1.247mAh cm −2 and a maximum mass-loading of 15.78 mg cm −2 . Notably, the battery demonstrates excellent electrochemical performance, even when subjected to challenging conditions like hammering, sewing, stretching, cutting and bending.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qin Zhang,Hui Wang,Shuang Chen,Xuming Liu,Jinhua Liu,Xin Liu
Hydrogel-based supercapacitors are an up-and-coming candidate for safe and portable energy storage. However, it is challenging for hydrogel electrolytes to achieve high conductivity and rapid self-healing at subzero temperatures because the movements of polymer chains and the reconstruction capability of broken dynamic bonds are limited. Herein, a highly conductive proton polyacrylamide-phytic acid (PAAm-PA) hydrogel electrolyte with rapid and autonomous self-healing ability and excellent adhesion over a wide temperature range is developed. PA, as a proton donor center, endows the hydrogels with high conductivity (102.0 mS cm–1) based on the Grotthuss mechanism. PA can also prevent the crystallization of water and form multiple reversible hydrogen bonds in the polymer network, which solves the dysfunction of self-healing hydrogels in a cryogenic environment. Accordingly, the hydrogel electrolytes demonstrate fast low-temperature self-healing ability with a self-healing efficiency of 79.4% within 3 h at −20 °C. In addition, the hydrogel electrolytes present outstanding adhesiveness on electrodes due to the generation of hydrogen bonds between PA and activated carbon electrodes. As a result, the integrated hydrogel-based supercapacitors with tight bonding electrode/electrolyte interface deliver a 139.5 mF cm–2 specific capacitance at 25 °C. Moreover, the supercapacitors display superb self-healing ability, achieving 92.1% of capacitance recovery after three cutting–healing cycles at −20 °C. Furthermore, the supercapacitors demonstrate only 6.4% capacitance degradation after 5000 charging–discharging cycles at −20 °C. This work provides a roadmap for designing all-in-one flexible energy storage devices with excellent self-healing ability over a wide temperature range.
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Yaru Sun,Bin Yu,Yan Liu,Bo Cheng,Jun Wang,Junbo Yan,Fenglei Huang
In this study, a bio-based additive nanosheet (PP-Fe) with multifunctionality was synthesized using self-assembly technology. The multidisciplinary performance of polylactic acid (PLA) composites with addition of PP-Fe was explored, including fire safety, mechanical properties, ultraviolet resistance (UV), electromagnetic interference (EMI) shielding, and flame retardancy. Good dispersion and interfacial compatibility of PP-Fe give its PLA nanocomposites excellent properties. Loading of 20.0 wt% PP-Fe nanosheets on PLA resulted in significant reductions in the maximum heat release rate (72.7 %), total heat release (41.6 %), and total smoke production (64.7 %). More important, the ultraviolet protection factor (UPF) value for the PLA/20PP-Fe composite was 120 %, which is categorized as excellent UV-shielding. In general, traditional flame retardant approaches significantly reduce mechanical performance. Compared to neat PLA, PLA/20PP-Fe exhibited reinforced mechanical properties. The mechanism of the improved multi-performance of the PLA nanocomposite was also determined.
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CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Longchao Ma,Tao Zhang,Yihan Zhao,Tiancheng Yuan,Xinzhou Wang,Yanjun Li
The inherent moisture absorption and flammability of wood can diminish its practical application value. In this research, a phytic acid-based flame retardant (PM) was synthesized by a hydrothermal method . Iron ions-doped phytic acid-based nanosheets (PM-Fe 3+ ) deposited on wood surface by vacuum impregnation. Subsequently, the wood was hydrophobically modified with octadecylamine (OA), resulting in the successful fabrication of superhydrophobic and flame-retardant composite wood (PM-Fe 3+ /OA/wood). The influence of various coating components on the wettability , heat, and flame retardancy properties of composite wood was examined through water contact angle (WCA), vertical burning tests (UL-94)， limiting oxygen index (LOI), and a cone calorimetry test. The results indicated that the WCA of PM-Fe 3+ /OA/wood was 154.9°. The composite wood possessed exceptional contamination resistance and self-cleaning properties due to its superhydrophobic surface. Furthermore, due to the dry surface of PM-Fe 3+ /OA/wood, it exhibited superior resistance to mold in comparison to natural wood. The combustion test results indicated that PM-Fe 3+ /OA wood exhibited an extremely short time to self-extinguish, achieving V-0 rating. It had a LOI value of 38.6%. Additionally, in the cone calorimetry test, the peak heat release rate (PHRR) and total heat release (THR) of composite wood were reduced by 56.6% and 52.2%, respectively. In summary, this work provides an attractive strategy for obtaining wood with superhydrophobic and flame-retardant properties, which enhances its practical application value.
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RSC Advances
·
2025
·Vol. 15
·期 8
·6089-6099
·
IF 4.6
Xinyu Jing,Xi Chen,Mingchuan Zhang,Xinyang Xu
In this study, the in situ growth method was employed to modify biochar with polypyrrole–titanium (PPy–TiN) nitride composites, aiming to enhance its performance as an anode material in microbial fuel cells (MFCs). A series of characterizations were conducted on the polypyrrole-modified corn straw biochar anode (PPy/CS), titanium nitride-modified corn straw biochar anode (TiN/CS), and polypyrrole/titanium nitride composite-modified biochar anode (PPy–TiN/CS) to evaluate the feasibility of the modification method and identify the optimal modification scheme. Characterization techniques included scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), electrochemical impedance spectroscopy (EIS), and Tafel analysis. SEM and FTIR analyses confirmed the successful integration of polypyrrole and titanium nitride with biochar, achieving a minimum solution resistance of 7.80 Ω and charge transfer resistance of 1.79 Ω. Compared to the unmodified electrode, the modified electrodes demonstrated improved performance, highlighting the need for the development of cost-effective, efficient, and durable anode materials.
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