JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Renquan Xing,Ying Liu,Jing Yan,Run Wang,Xupin Zhuang,Guang Yang
Moist-electric generators (MEGs), which are capable of spontaneously generating energy from ubiquitous moisture, are considered as a potential power supply candidate for wearable electronics . However, the application of the MEGs in the wearable field is still challenging due to the low electric output and the lack of wearable attributes such as breathability and flame retardancy. Herein, we demonstrated a wearable MEG with high power-output, breathability and flame retardancy, which was fabricated by designing an asymmetrical nanofiber assembly using hydrophilic polyvinyl alcohol/phytic acid (PVA/PA) and hydrophobic polyvinylidene difluoride (PVDF) nanofiber membranes. Owing to the synergistic effects of strong water absorption, enhanced ion release and numerous micro-nano transport channels, a single MEG of 1 cm 2 could constantly generate high direct-current (DC) power, i.e., a voltage of 1.0 V, a current of 15.5 μA, and a power density of 3.0 μW cm −2 , outperforming other reported nanofiber-based MEGs. More importantly, the asymmetric nanofiber structure ensured the moisture circulation inside MEG and thus produced a sustained voltage output for 7 days without any deterioration. The MEG also showed good flexibility, air/moisture permeability and flame retardancy, which give it necessary wearable attributes. Furthermore, large-scale integration of MEG units could be readily realized to fabricate a power source device for driving different portable electronics, while the moisture sensitivity made the MEG well used for sensing applications (e.g., respiration monitoring, fire warning).
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Wenhao Xi,Tongchen Wu,Pan Wang,Wenlong Huang,Bifen Gao,Liwen He,Yilin Chen,Bizhou Lin
Transition metal phosphides (TMPs) with high electrocatalytic activity for the oxygen evolution reaction (OER) are reckoned as a substitution of precious group metals catalysts in rechargeable Zn-air battery. In this work, Co/Co 2 P heterojunction nanoparticles supported N,P-doped carbon nanosheets (Co/Co 2 P@NPCNS) were designed and prepared via a facile one-step molten salt-assisted pyrolysis process. Density function theory calculations reveal that the heterogeneous interactions of Co/Co 2 P effectively enhance the bifunctional electrocatalytic activity for oxygen reduction reaction (ORR) and OER. The synergistic interaction between the Co/Co 2 P heterojunction nanoparticles with highly exposed active sites and excellent catalytic activity and the two-dimensional doped carbon nanosheets with high conductivity contributes to Co/Co 2 P@NPCNS exhibiting preeminent bifunctional ORR/OER activity and stability with a high half-wave potential for ORR (0.87 V), a low overpotential for OER (302 mV at 10 mA cm −2 ) and a low potential gap (0.66 V). The homemade rechargeable Zn-air battery performs high peak power density (187 mW cm −2 ) and exceptional endurance. This heterogeneous interface tactic of integrating TMPs with heteroatom-doped carbon materials may shed light on the research and development of non-precious metal electrocatalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Xiaoyu Cheng,Huixiang Wang,Shaowei Wang,Yue Jiao,Chenyu Sang,Shaohua Jiang,Shuijian He,Changtong Mei,Xinwu Xu,Huining Xiao,Jingquan Han
The flexible and self-healing supercapacitors (SCs) are considered to be promising smart energy storage devices. Nevertheless, the SCs integrated with flexibility, lightweight, pattern editability, self-healing capabilities and desirable electrochemical properties remain a challenge. Herein, an all-in-one self-healing SC fabricated with the free-standing hybrid film (TCMP) composed of the 2,2,6,6-tetramethylpiperidin-1-yloxy-oxidized cellulose nanofibers (TOCNs) carried carbon nanotubes (CNTs), manganese dioxide (MnO 2 ) and polyaniline (PANI) as the electrode, polyvinyl alcohol/sulfuric acid (PVA/H 2 SO 4 ) gel as the electrolyte and dynamically cross-linked cellulose nanofibers/PVA/sodium tetraborate decahydrate (CNF/PB) hydrogel as the self-healing electrode matrix is developed. The TCMP film electrodes are fabricated through a facile in-situ polymerization of MnO 2 and PANI in TOCNs-dispersed CNTs composite networks, exhibiting lightweight, high electrical conductivity , flexibility, pattern editability and excellent electrochemical properties. Benefited from the hierarchically porous structure and high mechanical properties of TOCNs, excellent electrical conductivity of CNTs and the desirable synergistic effect of pseudocapacitance induced by MnO 2 and PANI, the assembled SC with an interdigital structure demonstrated a high areal capacitance of 1108 mF cm −2 at 2 mA cm −2 , large areal energy density of 153.7 μWh cm −2 at 1101.7 μW cm −2 . A satisfactory bending cycle performance (capacitance retention up to 95 % after 200 bending deformations) and self-healing characteristics (∼90 % capacitance retention after 10 cut/repair cycles) are demonstrated for the TCMP-based symmetric SC , delivering a feasible strategy for electrochemical energy storage devices with excellent performance, designable patterns and desirable safe lifespan.
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Small
·
2024
·Vol. 20
·期 40
·2401995
·
IF 13
Yang-Yang Xie,Qing-Song Liu,Guo-Rui Zhu,Gang Wu,Si-Chong Chen,Yu-Zhong Wang
Upgrading thermosetting polymer waste and harvesting unwanted electromagnetic energy are of great significance in solving environmental pollution and energy shortage problems. Herein, inspired by the glass-blowing art, a spontaneous, controllable, and scalable strategy is proposed to prepare hollow carbon materials by inner blowing and outside blocking. Specifically, hierarchically neuron-like hollow carbon materials (HCMSs) with various sizes are fabricated from melamine-formaldehyde sponge (MS) waste. Benefiting from the synergistic of the hollow “cell body” and the connected “protrusions” networks, HCMSs reveal superior electromagnetic absorption performance with a strong reflection loss of −54.9 dB, electromagnetic-heat conversion ability with a high conversion efficiency of 34.4%, and efficient energy storage performance in supercapacitor. Furthermore, a multifunctional device integrating electromagnetic-heat-electrical energy conversion is designed, and its feasibility is proved by experiments and theoretical calculations. The integrated device reveals an output voltage of 34.5 mV and a maximum output power of 0.89 µW with electromagnetic radiation for 60 s. This work provides a novel solution to recycle polymer waste, electromagnetic energy, and unwanted thermal energy.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Yadong Wang,Jingjing Gao,Li Ma,Hui Ge,Guoping Zhu,Zongmin Zhu
The preparation of flame-retardant high-performance polylactic acid (PLA) composites by adding green flame retardants have always been a challenge. In this work, an intumescent flame-retardant PCR based on phytic acid, chitosan, and resveratrol was successfully designed. Adding 4 wt% of PCR, the PLA-PCR composite was classified as UL-94 V-0 grade, with a LOI value increasing from 19.7 % (pure PLA) to 26.0 %, a peak heat release rate decreasing from 433 to 344 kW/m 2 . Owing to excellent compatibility of PCR, the mechanical strength and toughness of PLA-PCR composites have been improved, as reflected by a ~ 16 % increase in tensile strength, a ~ 73 % increase in impact strength and a ~ 57 % increase in toughness. In addition, PCR also presented plasticization effect on PLA, making it easier to process. This work provided a highly efficient and environmental-friendly modification approach for the development of multifunctional polymers.
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Materials Today Communications
·
2025
·
IF 4.5
Dexian Yin,Mengyao Zhai,Xin Wang,Shikai Hu,Xiuying Zhao
Thermoplastic polyurethane (TPU) has restricted applications owing to flammability concerns, whereas conventional intumescent flame retardants predominantly utilize non-renewable feedstocks. In this work, bio-based TPU was synthesized through prepolymer methodology employing bio-based poly (trimethylene ether) glycol, pentamethylene diisocyanate, and 1,4-butanediol. Flame-retardant bio-TPU/PA composites were subsequently fabricated by incorporating bio-based phytic acid (bio-PA) as a modifying agent. Structural characterization and performance evaluation demonstrated that at 20 phr bio-PA loading, bio-TPU/PA composites exhibited decreased tensile strength (from 20.4 MPa to 9.5 MPa) and reduced elongation at break (from 502 % to 324 %). X-ray diffraction analysis revealed that the crystalline structure of bio-TPU remained unaffected by bio-PA incorporation. Notably, the flame-retardant performance of the composites showed progressive enhancement as bio-PA content increased. Specifically, the peak heat release rate declined by 56.2 % (from 1216 kW/m 2 to 533 kW/m 2 ), and the average effective combustion heat exhibited a 24.4 % reduction (from 41 MJ/kg to 31 MJ/kg). This work establishes a sustainable strategy for developing flame-retardant bio-TPU composites, simultaneously addressing fire safety concerns and expanding the application potential of renewable polyurethane materials through environmentally benign modification approaches.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zhenyang Li,Huijuan Zhang,Chenyu Li,Xiyu Tian,Shuzheng Liu,Gang Qin,Jia Yang,Qiang Chen
As flexible electronics devices for energy storage, mechanical energy collection and self-powered sensing, stretchable flexible supercapacitor and triboelectric nanogenerator (TENG) have attracted extensive attention. However, it is difficult to satisfy the requirements of high safety and resistance to extreme conditions. Dual roles of mechanical and electrical enhancement of inorganic salt are put forward, and a carrageenan (CG) enhanced poly ( N -hydroxyethyl acrylamide)/CG/lithium chloride/glycerol (PCLG) conductive gel is prepared by designing hydrogen bonding self-crosslinking and chain entanglement . A high concentration and rapid deposition strategy is proposed to prepare a PCLG gel-based stretchable flexible all-in-one supercapacitor for energy storage, and a single electrode PCLG gel-based TENG is designed for mechanical energy collection, self-powered strain and tactile sensing. The supercapacitor has high capacitance, excellent cycling stability. The TENG possesses efficient energy harvesting with high and stable output voltage and power density, and sensitive and stable self-powered strain and tactile sensing without external power supply. Even under extreme conditions such as low temperatures, self-healing after damage, prolonged placement, deformation, post-deformation, multiple continuous work, pinprick and burning, the supercapacitor and TENG still have excellent properties. Therefore, we provide novel ideas to design flexible supercapacitor and TENG used under extreme conditions for future wearable electronics .
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CARBON
·
2024
·
IF 10.5
Ke Xu,Yue Jiao,Jian Li,Huining Xiao,Qiliang Fu
Metal-air batteries require the exploration of affordable electrocatalysts with exceptional catalytic performance for oxygen reduction reactions (ORR). One of the powerful ways to develop highly active and robust oxygen electrocatalysts is to load transition metal compounds onto a highly porous carbon aerogel . Here, we report a cell wall nanoengineering strategy to transform natural balsa wood into a wood-derived carbon aerogel (WCA), following by loading FeP nanoparticles inside the hierarchical N, P-doped WCA for ORR electrocatalysts. Wood nanotechnology is applied to manipulate the microstructure of the porous carbon aerogel with low-tortuosity, multichannel, and aligned pore, which benefits to the electron transportation for boosting the ORR. Under 0.1 M KOH conditions, the initial potential, half wave potential and limit current of FeP@N,P-WCA are 0.95 V, 0.84 V, and 5.20 mA cm −2 respectively, which are much higher than that of untreated wood and comparable to commercial Pt/C. The aqueous Zn-air batteries assembled with this catalyst exhibit a remarkable specific capacity of 775.5 mA h g −1 and better charge-discharge cycling stability. The excellent electrocatalytic activity demonstrated by FeP@N,P-WCA for ORR is attributed to the inherent tri-pathway (lumen, pit, and ray cell) porous structure of wood, the high conductivity and specific surface area of WCA (584.2 m 2 g −1 ), and the highly dispersed FeP nanoparticles . This work provides a structural design concept for achieving high electrocatalytic biobased WCA reactors by combining wood nanotechnology and electrocatalysts chemistry for energy storage and conversion .
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Nano Energy
·
2024
·
IF 16.8
Hanchen Wang,Ruzhi Shang,Junwei Chen,Xiaoya Jin,Kailiu Chen,Biao Huang,Huamin Chen,Qi-Lin Lu
Chitosan hydrogel has garnered significant interest for its potential to confer excellent biocompatibility, degradability, and renewability upon flexible electronics. Nonetheless, its inherent mechanical weaknesses have necessitated compromises in terms of flexibility, conductivity, and sensing sensitivity, thereby limiting its applicability. In this study, we present a flexible chitosan sensing hydrogel with remarkable properties, including high-conductivity (9.96 S/m) and ultra-sensitivity (gauge factor=11.83), achieved through the coordination effect of phytic acid (PA). A novel protective cross-linking strategy was employed, balancing the strong complexing ability of PA through the regulation of carboxylated cellulose nanofiber (CCNF) to establish a moderate cross-linked network between chitosan (CS) and polyethyleneimine (PEI). CCNF not only forms hydrogen bonds with CS and PEI, occupying some active sites that could chelate with PA, but also repels adjoining PA via electrostatic repulsion , thereby preventing excessive coordination. Consequently, the resulting hydrogel exhibits superior properties, including excellent flexibility, deformability , conductivity and GF, while simultaneously possessing high sensing sensitivity and energy harvesting capacity. Remarkably, the hydrogel-assembled sensors demonstrate outstanding performance in monitoring subtle facial expression changes, throat motion, and various limb movements. Even more impressively, the hydrogel-based triboelectric nanogenerator (TENG) exhibits exceptional energy harvesting capacity (1070.8 mW/m 2 ) and high accuracy (98 %) for handwriting recognition. This study presents a promising approach for constructing biomass-based multifunctional hydrogels with enhanced sensing capabilities and energy harvesting abilities, paving the way for their utilization in high-performance self-powered devices and intelligent handwriting recognition systems.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Yu-long Liu,Zi-cheng Tang,Zi-jie Huang,Wan-jun Jiang,Ting-yu Zhu,Jie Chen,Jing-hui Yang,Xiao-dong Qi,Yong Wang
Phase change materials (PCMs) with thermal energy storage property are vital in solar-thermal energy conversion and utilization systems. However, low thermal conductivity, low light absorption, and severe brittleness are major application-hindering factors. In this work, paraffin wax (PW) was vacuum impregnated into poly(dimethylsiloxane) (PDMS)/boron nitride (BN)/polypyrrole (PPy) foam to create flexible phase change composites (PCCs) with excellent thermal conductivity and solar-thermal energy conversion efficiency. The PDMS/BN/PPy foams were successfully prepared via the sugar template and chemical vapor deposition methods. The PDMS/BN/PPy/PW PCCs exhibited excellent phase change latent heat of 172 J g −1 and dimensional retention ratio of 98.91%. The continuous BN network imparted the PCCs with enhanced thermal conductivity of 0.43 W m −1 K −1 . Meanwhile, the flexible PCCs were capable of being elastically deformed and closely adhered to the rough surface, thus further improving the heat transfer efficiency. More importantly, the wrinkled PPy and the hierarchical porous structure improved light absorption by extending the optical path for multiple reflections, maintaining an outstanding solar-thermal energy conversion efficiency of 91.9%. A solar-thermal-electric energy conversion (STEEC) system was constructed to display the potential of PCCs to generate clean energy. PCCs could output a current of 84.7 mA and support the rotation of a fan for 243 s, even without light irradiation. This study provides a facile approach to preparing multi-functional PCCs, showing the advantages in the rapid collection and storage of solar energy.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Longchao Ma,Yihan Zhao,Tao Zhang,Tiancheng Yuan,Xinzhou Wang,Yanjun Li
The flattened bamboo board (FB) represents a promising innovation in the bamboo industry. To address the challenges of flammability and hygroscopicity, composite coatings consisting of melamine (MEL), phytic acid (PA), cerium ions (Ce 3+ ), and sodium laurate (La) are assembled on the FB surface through an in-situ impregnation strategy. The resulting MEL/PA-Ce 3+ @La FB exhibits exceptional flame retardancy. It achieves a V-0 rating in the vertical burning test (UL-94) and boasts a high limiting oxygen index (LOI) value of 38.5 %. The coated FB exhibits superhydrophobicity, evidenced by a water contact angle of 156.5°, which can be attributed to the in-situ growth of PA-Ce 3+ complexes (for constructing micro/nanoscale coarse structures) and the modification with La (for reducing surface energy).This superhydrophobic surface imparts both self-cleaning and anti-mold properties to the coated FB. Moreover, the coated FB exhibits excellent mechanical stability, withstanding 36 cycles of sandpaper abrasion and tape peeling without losing its hydrophobicity. In summary, this work provides an innovative strategy for the bamboo processing industry to produce flattened bamboo boards with combined flame retardancy, superhydrophobic and anti-mold properties. Such versatility holds significant potential to facilitate the utilization of flattened bamboo boards in the construction and decorative materials industries.
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Communications Materials
·
2024
·Vol. 5
·期 1
·1-8
·
IF 7.5
Ai Yuanfang,Zheng Na,Liu Wenbo,Yang Ping,Wu Xi,Tian Yichen,Wang Chuyi,Liu Heyang,Huang Chongping,Liang Zhongli,Zhu Feng,Tang Longcheng,Ye Nanbiao,Li Jianjun,Cao Kun
Frequent forest fires, driven by hotter and drier climates, threaten biodiversity and human health, causing significant economic losses, air pollution, soil erosion, and degeneration. Current active and passive fire protection methods often suffer from environmental pollution, poor flexibility, and limited availability in remote areas. However, fast-acting surface flame retardants for passive forest fire protection, particularly for foliage, are rare. Herein, we report an easily obtainable gelatin-based fire spray, which resulted in 1.8 and 16.3-fold extension in ignition time, 34% and 39% reductions in total heat release, 78% and 92% reductions in fire growth index for dead and fresh leaves, respectively. After the fire warning is suppressed, for instance by rain, the sprayed substances can decompose and provide nitrogen and phosphorus as leaf and soil fertilizers without affecting soil microbial function, which increase plant net photosynthesis by 84% and effective nitrogen and phosphorus by 664% and 140%, respectively. Our green flame retardant and fertilizer material allows for simultaneous tree fire protection and growth.
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危险品化学品经营许可证（带存储）