JOURNAL OF POWER SOURCES
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2026
·
IF 8.4
Xu Yang,Kaijia Zuo,Nianben Zheng,Zhiqiang Sun
Minimizing polarization losses and enhancing stability through electrode engineering are essential for improving the efficiency of the vanadium redox flow battery (VRFB) systems. In this work, we present an asymmetric VRFB featuring a nitrogen-doped graphite felt (N-GF) with a carbon nanofiber network as the positive electrode, and a bismuth-decorated graphite felt (Bi-GF) as the negative electrode. The N-GF enhances the redox kinetics of the V 5+ /V 4+ pairs and provides structural durability, while the Bi-GF mitigates the hydrogen evolution reaction and facilitates the V 3+ /V 2+ reaction. As a result, the asymmetric cell achieves an energy efficiency of 90.72% at 100 mA cm −2 and maintains 80.52% at 250 mA cm −2 . After 200 cycles at 250 mA cm −2 , the energy efficiency exhibits a minimal average decay rate of only 0.017% per cycle, while the capacity retention remains at 73.47%. Long-term cycling analysis further reveals that N-GF preserves its nanofiber network and surface chemistry, whereas the pristine graphite felt suffers from serious carbon corrosion. This work demonstrates that rational asymmetric electrode design is an effective strategy to achieve both high energy efficiency and long-term durability in VRFBs.
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Chemistry-An Asian Journal
·
2026
·Vol. 21
·期 1
·e70527
·
IF 3.3
Han Wang,Yue Zhong,Mingzhong Li,Yanwei Li,Cong Liu,Yanhui Li
Electrochemical overall water splitting is one of the main choices to realize hydrogen energy. In this study, a simple strategy of self-growth of carbon nanotubes with the tip end of Co nanoparticles compound Fe-Nx/mesoporous carbon as bi-functional electrocatalyst is proposed. At high temperature, cobalt nanoparticles catalyze the self-growth of nitrogen-doped carbon nanotubes with a tip of cobalt particles from a metal-organic framework ZIF-8. FeTAPc as Fe and N resource is further adsorbed on the shell and then re-carbonized under 900°C to fix Fe-Nx on the polyhedron carbon shell to form bi-functional electrocatalyst (Fe-Nx/Co-NC-900). Fe-Nx/Co-NC-900 showed good OER (330 mV) and HER (239 mV) overpotential. As a result, the porous structure of Fe-Nx/Co-NC-900 and the interconnected three-dimensional carbon network promote the material transport. The self-growing carbon nanotubes improve the conductivity of the electrocatalyst and avoid aggregation. The high dispersion of two kinds of metal atoms and the mixed growth of metal nanoparticles co-endowed Fe-Nx/Co-NC-900 electrocatalyst with rich activity. In addition, Fe-Nx/Co-NC-900 has been used to assemble an electrochemical overall water splitting with a driving voltage of 1.67 V, which shows its practical application in electrochemical overall water splitting. This study provides enlightenment in application of hydrogen energy production.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zongyu Wang,Haowei Li,Liyan Dang,Zepeng Pu,Zhengguan Xu,Aiping Fu,Hongliang Li
The composites of reduced graphene oxide (rGO) encapsulated porous silicon (P-Si) microspheres are constructed using metallic aluminum as a bi-functional reducing agent at low temperatures. The preparation process of P-Si is carried out in a special reactor at 300 °C. For the reaction, SiO 2 is used as the silicon source and AlCl 3 is added to maintain the smooth progress of the thermite reduction reaction. Subsequently, graphene oxide is reduced by aluminum powder in an acidic liquid phase system and then the P-Si/rGO composite material is constructed by freeze-drying technique. As a kind of promising anode for lithium-ion batteries (LIBs), the porous structure of silicon microspheres can relieve the internal stress caused by volume expansion and shorten the diffusion path of lithium ions during charge/discharge processses. The flexible graphene layers can adapt the volume effect of the P-Si microspheres and therefore maintain the structural stability of the composites and enhance the electrical conductivity . The obtained P-Si/rGO composite material exhibits excellent electrochemical performance, which can maintain a superior capacity of 837 mAh g −1 upon 500 cycles under a current density of 0.5 A g −1 and exhibit satisfied cycling stability with a capacity of 704 mAh g −1 after 1000 cycles at a 1 A g −1 current density.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Nan Wang,Shangming Huang,Hanwei Cai,Xidong Lin,Riguo Mei,Ning Wang
Due to the toxicity of heavy metal ions which impacts on public health and the environment, the development of effective methods of detection has assumed a high priority. In this study, we have established an electrochemical sensor based on a CoCu-MOF/polyaniline (CoCu-MOF/PANI) sensing electrode that can simultaneously detect Pb 2+ and Cd 2+ in water samples. The CoCu-MOF/PANI composite was prepared by a one-step in situ polymerization method and characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR). The Pb 2+ and Cd 2+ content was detected by differential pulse voltammetry (DPV) at an optimized pH (4.5). The proposed electrochemical sensor has achieved simultaneous Pb 2+ and Cd 2+ detection down to 0.39 ug/L (Pb 2+ ) and 0.61 ug/L (Cd 2+ ). Anti-interference and reproducibility experiments have been conducted. In spiking experiments, the recovery of Pb 2+ and Cd 2+ in water samples ranged from 98.6% to 102.13%, indicating effective targeted electrochemical sensing. This work has delivered a functional design of CoCu-MOF/PANI materials, and established an efficient methodology for heavy metal ion detection.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Jiashu Long,Xiaocan Zhang,Siqin Zeng,Tong Pei,Huixiao Ma,Xuesong Li,Xiaoyu Meng
Functionalized metal-organic frameworks (MOFs) are being extensively developed as viable fillers to enhance the proton conductivity of proton exchange membranes . Herein, an amino-pendant sulfonic acid bi-functionalized MOFs material (UNCS)-doped SPEEK membrane with low degree of sulfonation (DS) can improve the proton conductivity as well as maintain the membrane dimensional stability. UNCS can act as bridges of proton donors and acceptors to reduce the activation energy barrier and shorten the distance of long-range proton conduction. Among all as-prepared membranes, SPEEK/UNCS-3 exhibited the highest proton conductivity of 186.4 mS·cm −1 at 75 °C and 100% relative humidity (RH), which is much greater than that of pristine SPEEK and Nafion 117. Benefiting from the acid-base pair interaction between the amino groups of UNCS and the sulfonic acid groups of SPEEK, the dimensional stability and mechanical properties of the composite membranes were enhanced. More interestingly, STEM-HAADF and SAXS characterization consistently revealed that UNCS served as bridges among proton channels in the composite membranes for continuous proton transport.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Wenjie Li,Lifen Li,Qineng Xia,Song Hong,Lijun Wang,Zhibo Yao,Tai-Sing Wu,Yun-Liang Soo,Hao Zhang,Tsz Woon Benedict Lo,Alex W. Robertson,Qingya Liu,Leiduan Hao,Zhenyu Sun
Electrochemical CO 2 reduction (ECR) to commodity chemicals offers a promising way for mitigating the greenhouse effect and driving the transition from fossil-fuel dependence to a sustainable economy. To this end, the design and development of active and robust electrocatalysts is key. Here we report for the first time that incorporation of bismuth (Bi) single atoms on defective CuO could significantly enhance the ECR reaction to C 2 H 4 by decreasing C–C coupling barriers. The overpotential for C 2 H 4 production is lowered by at least 50 mV, along with a two-fold improvement in the faradaic efficiency, reaching 60% at 400 mA cm −2 . The high performance is maintained even after 20 h of consecutive electrolysis. Control experiments along with density functional theory calculations suggest that the joint incorporation of Bi and oxygen vacancies greatly promotes CO 2 adsorption and lowers C–C coupling energy barriers, thereby improving the C 2 H 4 selectivity.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Min Sang,Junshuo Zhang,Shuai Liu,Jianyu Zhou,Yu Wang,Huaxia Deng,Jun Li,Ji Li,Shouhu Xuan,Xinglong Gong
Smart wearable devices with mechanical anti-impact property and electromagnetic interference shielding performance are highly required for providing comprehensive and effective protection for human beings under special conditions. Herein, a multifunctional SSE/MXene-NWF/SSE (SMS) sandwich composite with multiple sensing properties, electromagnetic interference shielding performance and anti-impacting ability was developed. By decorating conductive MXene onto the middle non-woven fabric (NWF), the as-fabricated SMS composite protects human from the harmful electromagnetic radiation with the shielding effectiveness up to 58 dB. The shear stiffening elastomer (SSE) whose storage modulus increases with the shear frequency displays typical shear stiffening effect, and thus confers SMS sandwich composite outstanding anti-impacting and safe-guarding properties which can dissipate nearly 97% impact energy. In addition, this SMS sandwich composite also meets the development needs of smart wearable devices, which can be comfortably attached onto human parts to monitor different human motions. Moreover, the intelligent alarm system and mechanical manipulator based on SMS sensor shows the promising application in wireless transmission and human–machine interaction. Finally, the designed SMS-based sensor array further displays its multi-perceptive characteristic under various stimuli as well as double-safeguarding abilities under impact and electromagnetic radiation. This work opens a new perspective for the development of multifunctional composite as smart wearable devices with anti-impacting and electromagnetic interference shielding properties for the comprehensive safeguarding of human beings.
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Biomaterials Advances
·
2022
·
IF 0
Subramani Kandhasamy,Yiming Zeng
Bronchial and pleural injuries with persistent air leak pose a threat in the repair and regeneration of pulmonary diseases. The need to arrive at a highly efficient therapy for closure of bronchopleural fistula (BPF) so as to effectively suppress inflammation, infection and repair the damaged pleural space caused by cancer as well as contractile restoration of bronchopleural scars remain a significant clinical challenge. Herein, we have designed and developed potent bioactive vitamin K3 carnosine peptide (VKC)-loaded spun SF fibroin fibers/collagen bi-layered 3D scaffold for bronchopleural fistula tissue engineering applications. The VKC drug showed excellent cell viability in human bronchial epithelial cells (HBECs), in addition to its pronounced higher cytotoxicity against the A549 lung cancer cell line with an IC 50 of 5 μg/mL. Furthermore, VKC displayed a strong affinity with the catalytic site of EGFR (PDB ID: 1M17 ) and VEGFR2 (PDB ID: 4AGD , 4ASD ) receptors in molecular docking studies. Following which the spun SF-VKC (primary layer) and collagen film (top layer) constructed bi-layered CSVKC were structurally elucidated and its morphological, physicochemical and biological characterizations were well examined. The bi-layered scaffold showed superior biocompatibility and cell migration ability in HBECs than other scaffolds. Interestingly, the CSVKC revealed rapid HBECs motility towards scratched regions for fast healing in vitro bronchial tissue engineering. In vivo biocompatibility and angiogenesis studies of the prepared scaffolds were evaluated and the results obtained demonstrated excellent new tissue formation and neovascularization in the bi-layered architecture rather than others. Therefore, our results suggest that the potent antibacterial and anticancer therapeutic agent (VKC)-impregnated silk fibroin fibers/collagen bi-layered 3D biomaterial could be useful in treating cancerous BPF and pulmonary diseases in future.
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PubMed
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yi Wen,Zheng Huang,Min Zhao,Longshan Zhao
The discharge of industrial heavy metal wastewater not only leads to environmental pollution, but also harms human health, so it is imperative to control heavy metal pollution. In the current work, a sequence of anatase/brookite TiO 2 @COF with different mass ratios, bi-phase TiO 2 and bare COF were successfully synthesized by simple hydrothermal synthesis. The photocatalytic activity of the prepared catalysts was assessed by reducing Cr(Ⅵ) in model pollutant (K 2 Cr 2 O 7 ). Under the condition of pH = 3, the Cr(Ⅵ) reduction rate of TiO 2 @COF-4 was as high as 99.19% in 30 min. The photocatalytic activity of TiO 2 @COF-4 remained stable in four consecutive cycles, suggesting that it has a potential application prospect for the removal of Cr(Ⅵ) in the actual environment. The morphology and structure of photocatalysts were observed by different techniques (SEM/EDS, HRTEM, BET analysis, XRD, FTIR and XPS). The specific reasons for the enhancement of photocatalytic performance of materials were explored by different methods (PL, UV–vis DRS, Mott-Schottky plots, I-T curves and EIS). Finally, we concluded that the photocatalytic system of TiO 2 @COF-4 may follow the typical direct Z- scheme mechanism. This work provides an effective solution for the water treatment of heavy metal pollution.
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Biomaterials Advances
·
2022
·
IF 0
Zhiping Fang,Yonghao Xiao,Xue Geng,Liujun Jia,Yuehao Xing,Lin Ye,Yongquan Gu,Ai-ying Zhang,Zeng-guo Feng
Increasingly growing problems in vascular access for long-term hemodialysis lead to a considerable demand for synthetic small diameter vascular prostheses, which usually suffer from some drawbacks and are associated to high failure rates. Incorporating the concept of in situ tissue engineering (TE) into synthetic small diameter blood vessels, for example, thermoplastic poly(ether urethane) (TPU) ones, could provide an alternative approach for vascular access that profits from the advantages of excellent mechanical properties of synthetic polymer materials (early cannulation) and unique biointegration regeneration of autologous neovascular tissues (long-term fistulae). In this study, a kind of heparinized small diameter (d = 2.5 mm) TPU/poly(ε-caprolactone) (TPU/PCL-Hep) bi-layered blood vessels was electrospun with an inner layer of PCL and an outer layer of TPU. Afterward, the inner surface heparinization was conducted by coupling H 2 N-PEG-NH 2 to the corroded PCL layer and then heparin to the attached H 2 N-PEG-NH 2 via the EDCI/NHS chemistry. Herein a heparinized PCL inner layer could not only inhibit thrombosis, but also provide sufficient space for the neotissue regeneration via biodegradation with time. Meanwhile, a TPU outer layer could confer the vascular access the good mechanical properties, such as flexibility, viability and fitness of elasticity between the grafts and host blood vessels as evidenced by the adequate mechanical properties, such as compliance (4.43 ± 0.07%/ 100 mmHg), burst pressure (1447 ± 127 mmHg) and suture retention strength (1.26 ± 0.07 N) without blood seepage after implantation. Furthermore, a rabbit carotid aortic replacement model for 5 months was demonstrated 100% animal survival and 86% graft patency. Puncture assay also revealed the puncture resistance and self-sealing (hemostatic time < 2 min). Histological analysis highlighted neotissue regeneration, host cell infiltration and graft remodeling in terms of extracellular matrix turnover. Altogether, these results showed promising aspects of small diameter TPU/PCL-Hep bi-layered grafts for hemodialytic vascular access applications.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 9
·3500-3509
·
IF 8.067
Dongnv Jin,Jiliang Ma,Runcang Sun
Coupling a semimetal with a semiconductor on nitrogen-doped carbon for photocatalytic reforming of biomass-derived feedstocks into high value-added chemicals is of great significance; however, no success has been achieved to date. Here, uniformly dispersed Bi/Bi2O3 nanospheres with a Mott–Schottky heterojunction embedded on the nitrogen-doped biochar nanosheets (Bi/Bi2O3@N-BC) were developed and successfully used in photocatalytic biomass-reforming to lactic acid. A built-in electric field between the interfaces of Bi and Bi2O3 was constructed via the Schottky effect of the Bi/Bi2O3 heterojunction, resulting in the rapid separation/migration of electrons–holes; whereas the N-BC facilitates the adsorption of reactants and the mass transfer of products or by-products. The highest yield of lactic acid reached was 91.21%, and Bi/Bi2O3@N-BC displayed excellent stability, reusability and universality. The experimental results indicated that the contents of photoinduced h+, ˙O2−, ˙OH and 1O2 increased with prolonging the visible-light irradiation time, and trapping tests suggested that ˙O2−, 1O2 and h+ promoted the lactic acid production in turn, whereas ˙OH inhibited the reaction. A 1000-fold scale-up experiment showed that the economically and environmentally viable system has potential for application in the industrial production of lactic acid, and this work also provides an efficient strategy for the development of functional photocatalysts and photocatalytic biorefinery.
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BIOMEDICINE & PHARMACOTHERAPY
·
2023
·
IF 7.5
Xianghao Lin,Xiaojuan Zou,Baifei Hu,Dongyun Sheng,Tianxiang Zhu,Mingzhu Yin,Hui Xia,Haiming Hu,Hongtao Liu
This study aimed to evaluate the preventive effect of Bi Xie Fen Qing Yin (BXFQY) decoction on hyperuricemic nephropathy (HN). Using an HN mouse model induced by oral gavage of potassium oxonate and adenine, we found that BXFQY significantly reduced plasma uric acid levels and improved renal function. Further study shows that BXFQY suppressed the activation of the NLRP3 inflammasome and decreased the mRNA expressions of pro-inflammatory and fibrosis-associated factors in renal tissues of HN mice. Also, BXFQY prevented the damage to intestinal tissues of HN mice, indicative of suppressed colonic inflammation and increased gut barrier integrity. By 16 S rDNA sequencing, BXFQY significantly improved gut microbiota dysbiosis of HN mice. On the one hand, BXFQY down-regulated the abundance of some harmful bacteria, like Desulfovibrionaceae, Enterobacter , Helicobacter, and Desulfovibrio . On the other hand, BXFQY up-regulated the contents of several beneficial microbes, such as Ruminococcaceae, Clostridium sensu stricto 1 , and Streptococcus . Using gas or liquid chromatography-mass spectrometry (GC/LC-MS) analysis, BXFQY reversed the changes in intestinal bacterial metabolites of HN mice, including indole and BAs. The depletion of intestinal flora from HN or HN plus BXFQY mice confirmed the significance of gut microbiota in BXFQY-initiated treatment of HN. In conclusion, BXFQY can alleviate renal inflammation and fibrosis of HN mice by modulating gut microbiota and intestinal metabolites. This study provides new insight into the underlying mechanism of BXFQY against HN.
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