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Unlocking the photo-Fenton potential of novel magnetically separable sulfur doped g-C3N4/CoFe2O4 Z-scheme heterojunction systems towards tetracycline removal 挖掘新型磁性可分离掺硫 g-C3N4/CoFe2O4 Z 型异质结系统在去除四环素方面的光-芬顿潜力
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-15 DOI: 10.1007/s10971-024-06509-3
Twinkle Garg,  Movikiran,  Nitansh, Simranjit Kaur, Bhupender Singh, Sonal Singhal

The increasing presence of antibiotics in water sources has become a major environmental concern. In this regard, designing of new photocatalysts possessing high visible light response and pertinent redox potentials are prerequisites. Herein, magnetically recoverable sulfur doped g-C3N4 (SCN)@CoFe2O4 (SCNCoFe) Z-scheme heterostructures were successfully fabricated by employing simple calcination route in which CoFe2O4 nanoparticles were allowed to grow over SCN nanosheets. The prepared heterostructures displayed highly efficient photocatalytic removal of tetracyclines i.e., tetracycline (TC) and minocycline (MC), SCNCoFe-20 showed the highest degradation efficiency, with around 94% for both TC and MC within 120 s of visible light irradiation. The mineralization efficacy analysis using total organic carbon removal % validated the practicality of proposed method towards removal of TC and MC from aquatic environment. Photoluminescence and radical quenching studies revealed the enhancement in H2O2 assisted photocatalytic degradation of TC and MC via Z-scheme charge transport, which comprehends the substantial synergy effect between photocatalysis and Fenton mechanism. Overall, this work provides a new insight into development of Z-scheme based heterostructures for antibiotics elimination from wastewater.

摘要 水源中抗生素的日益增多已成为一个主要的环境问题。为此,设计具有高可见光响应和相关氧化还原电位的新型光催化剂是先决条件。本文采用简单的煅烧路线,让 CoFe2O4 纳米颗粒在 SCN 纳米片上生长,成功制备了磁性可回收的掺硫 g-C3N4 (SCN)@CoFe2O4 (SCNCoFe) Z 型异质结构。所制备的异质结构可高效光催化去除四环素类药物,即四环素(TC)和米诺环素(MC),其中 SCNCoFe-20 的降解效率最高,在可见光照射 120 秒内对四环素和米诺环素的降解效率均达到 94%左右。利用总有机碳去除率进行的矿化效力分析验证了所提方法在去除水生环境中的 TC 和 MC 方面的实用性。光致发光和自由基淬灭研究表明,H2O2 通过 Z 型电荷传输增强了对 TC 和 MC 的光催化降解能力,从而理解了光催化和 Fenton 机制之间的实质性协同效应。总之,这项工作为开发基于 Z-梯度的异质结构以消除废水中的抗生素提供了新的视角。
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引用次数: 0
ZnO-Ag/SiO2 blue light blocking films prepared at relatively low temperature 在相对较低温度下制备的 ZnO-Ag/SiO2 阻蓝光薄膜
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-14 DOI: 10.1007/s10971-024-06506-6
Xingyang Wu, Weidong Qiao, Jiaqi Yu, Hongdong Wang, Jianhua Zhang

With the increasing application of display and illumination devices, the injury of blue light to human eyes have attracted more and more attention. The current absorptive anti-blue light films require high preparation temperatures. This study prepared ZnO-Ag nanofilms by sol–gel method at relatively low temperature, 250 °C. The films were further enhanced with SiO2 protective layer under 200 °C to improve the mechanical properties and stability, and the transmittance was investigated. The results showed that the films blocked 50.4% of blue light at wavelengths of 415–455 nm while maintained an impressive average transmittance of 98% for visible light in the range of 500–800 nm. The films had no visual effect on the display quality and the color rendering index increased only from 80.3 to 83.4, but it reduced 25% of blue light-weighted irradiance. Additionally, the films exhibited a high stability when exposed to a high temperature and humid environment (85 °C and 85% RH). Rubbing with a Teflon ball at a load of 0.5 N and a linear speed of 80 mm/min for 30 min did not show significant damage. Finally, the damage to epithelial cells exposed to blue light in the presence of the developed film was greatly alleviated.

Graphical Abstract

随着显示和照明设备应用的不断增加,蓝光对人眼的伤害越来越受到人们的关注。目前的抗蓝光吸收薄膜需要较高的制备温度。本研究采用溶胶-凝胶法在相对较低的温度(250 °C)下制备了 ZnO-Ag 纳米薄膜。在 200 ℃ 下用二氧化硅保护层进一步增强了薄膜的机械性能和稳定性,并对其透射率进行了研究。结果表明,薄膜在波长为 415-455 纳米时阻挡了 50.4% 的蓝光,而在波长为 500-800 纳米的可见光中保持了 98% 的平均透射率,令人印象深刻。薄膜对显示质量没有视觉影响,显色指数仅从 80.3 提高到 83.4,但却降低了 25% 的蓝光加权辐照度。此外,薄膜在高温潮湿环境(85 °C、85% RH)中表现出很高的稳定性。用特氟龙球以 0.5 牛顿的负载和 80 毫米/分钟的线速度摩擦 30 分钟,也没有发现明显的损伤。最后,在显影薄膜存在的情况下,暴露在蓝光下的上皮细胞受到的损伤大大减轻。
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引用次数: 0
Well-designed submicron rutile pigment heterophase junction photocatalyst via sol-gel method for organic pollutants removal 通过溶胶-凝胶法精心设计的亚微米级金红石色素异相结光催化剂用于去除有机污染物
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-13 DOI: 10.1007/s10971-024-06516-4
Jiarong Ma, Lijuan Zhang, Hao Ding, Sijia Sun, Yu Tu, Jian Zheng, Wei Li

Nano TiO2 is an acclaimed photocatalyst, widely used in water treatment due to its remarkable performance. However, challenges in real production, such as the easy recombination of photogenerated carriers and recycling difficulties, limit its application. Heterojunction photocatalysts, with high efficiency of photogenerated carrier separation and large light absorption range, show great potential for efficient water pollution treatment. In this paper, a composite photocatalyst (ART-550) with a heterophase junction structure was developed using industrial submicron rutile TiO2 pigment as the carrier. This composite demonstrated excellent performance in the photocatalytic degradation of sulfadiazine, maintaining its performance over five cycles. Furthermore, it effectively degraded various representative organic pollutants present in water bodies. The construction of a heterophase junction boosted the efficient separation of photo-generated carriers, enabling more active species to participate in the reaction and thus enhancing the photocatalytic degradation performance. Additionally, the strong interfacial binding ensured the stability of the photocatalytic performance of ART-550. This research introduces a new strategy to broaden the application field of submicron rutile and produce nano-titanium dioxide catalysts that are easily accessible, scalable, and highly applicable. It offers promising prospects for advancing water treatment technologies.

Graphical Abstract

纳米二氧化钛是一种广受赞誉的光催化剂,因其卓越的性能而被广泛应用于水处理领域。然而,在实际生产中,光生载流子易重组、回收困难等难题限制了其应用。异质结光催化剂具有光生载流子分离效率高、光吸收范围大等特点,在高效水污染处理方面显示出巨大的潜力。本文以工业亚微米级金红石型二氧化钛颜料为载体,开发了一种具有异相结结构的复合光催化剂(ART-550)。这种复合材料在光催化降解磺胺嘧啶方面表现出优异的性能,可在五个周期内保持其性能。此外,它还能有效降解水体中存在的各种代表性有机污染物。异相结的构建促进了光生载流子的有效分离,使更多的活性物种参与反应,从而提高了光催化降解性能。此外,强界面结合确保了 ART-550 光催化性能的稳定性。这项研究为拓宽亚微米金红石的应用领域、制备易于获得、可扩展且适用性强的纳米二氧化钛催化剂提出了新的策略。它为推动水处理技术的发展提供了广阔的前景。
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引用次数: 0
Plastic deformation and heat-enabled structural recovery of monolithic silica aerogels 整体二氧化硅气凝胶的塑性变形和受热结构恢复
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-13 DOI: 10.1007/s10971-024-06494-7
Julien Gonthier, Ernesto Scoppola, Aleksander Gurlo, Peter Fratzl, Wolfgang Wagermaier

Drying shrinkage during ambient pressure drying of silica gels is made reversible by preventing condensation reactions of surface silanol groups via surface modification. This partial recovery of the gel volume and structure is referred to as the spring-back effect (SBE) and enables the production of monolithic silica aerogels by evaporative drying. The SBE is sometimes completed by annealing at mild temperatures. Similarities between drying-related deformations and deformations induced by mechanical stimuli suggest analogous underlying mechanisms. While the causes of drying shrinkage are relatively well-known, it remains unclear how the relaxation of the structure by drying and annealing occurs across the different length scales. Here we show a complete structural recovery of silica aerogels at the macro- and nano-scale enabled by annealing. We propose that residual deformations after drying and mechanical compression are caused by the entanglement of silica clusters that can be unraveled by annealing at 230 °C. The deformation under loading is interpreted as two different re-arrangement mechanisms for dry and annealed gels, by the sliding of the silica clusters along the loading direction and by the compression of large pores beyond the fractal structure, respectively. Our results demonstrate how the shape and structure of silica aerogels can be restored and controlled by thermal activation, broadening the various applications of these materials. We also emphasize how tuning silica gels to promote a two-step SBE by annealing can pave the way toward the production of larger monolithic aerogels by APD.

Graphical Abstract

通过表面改性防止表面硅醇基团发生缩合反应,可使二氧化硅凝胶在常压干燥过程中的干燥收缩具有可逆性。这种凝胶体积和结构的部分恢复被称为回弹效应(SBE),可通过蒸发干燥生产整体硅气凝胶。SBE 有时可通过低温退火来完成。与干燥相关的变形和机械刺激引起的变形之间存在相似之处,这表明两者之间存在类似的内在机制。虽然干燥收缩的原因相对众所周知,但干燥和退火对不同长度尺度结构的松弛是如何发生的仍不清楚。在这里,我们展示了二氧化硅气凝胶在宏观和纳米尺度上通过退火实现的完全结构恢复。我们认为,干燥和机械压缩后的残余变形是由二氧化硅团簇的缠结造成的,而这种缠结可以通过在 230 °C 下退火来解开。对于干燥凝胶和退火凝胶,加载下的变形被解释为两种不同的重新排列机制,分别是二氧化硅团簇沿加载方向的滑动和分形结构以外的大孔隙的压缩。我们的研究结果表明,二氧化硅气凝胶的形状和结构可以通过热活化得到恢复和控制,从而拓宽了这些材料的各种应用领域。我们还强调了通过退火调整二氧化硅凝胶以促进两步SBE如何为通过APD生产更大的整体气凝胶铺平道路。
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引用次数: 0
Hybrid Polyvinyl Alcohol-Silica Antibacterial Nanofiber Fabricated by Combined Sol-Gel and Electrospinning Techniques 通过溶胶-凝胶和电纺丝联合技术制备的聚乙烯醇-二氧化硅混合抗菌纳米纤维
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-11 DOI: 10.1007/s10971-024-06510-w
Khadija El Kalaaoui, Aicha Boukhriss, Oumaima Bili, Mohamed Ait Chaoui, Sanaa Majid, Mohamed El Hajaji, Said Gmouh

Organic-inorganic hybrids are valuable due to their combined properties. This study fabricated polymer-silica hybrid nanofibers with antibacterial properties using silica and polyvinyl alcohol (PVA) through sol-gel and electrospinning methods. The nanofibers, incorporating chloropropyltriethoxysilane (CPTS) and Benzalkonium chloride (BAC), were analyzed for their morphology, chemical composition, mechanical properties, thermal properties, and antibacterial activity. Optimal characteristics in fibrous structure, mechanical strength, and antibacterial efficiency were achieved with a blended 8% wt PVA. Sample H, containing 1% BAC, showed significant bacterial growth inhibition (20 mm for Staphylococcus aureus and 9.2 mm for Escherichia coli), along with enhanced thermal stability (260.41 °C) and tensile strength (12.4 MPa). This study demonstrates the potential of electrospinning in creating advanced hybrid nanofibers with diverse applications in the medical field.

Graphical Abstract

有机-无机杂化物因其综合特性而具有重要价值。本研究利用二氧化硅和聚乙烯醇(PVA),通过溶胶-凝胶法和电纺丝法制备了具有抗菌性能的聚合物-二氧化硅杂化纳米纤维。研究分析了加入氯丙基三乙氧基硅烷(CPTS)和苯扎氯铵(BAC)的纳米纤维的形态、化学成分、机械性能、热性能和抗菌活性。8% 重量百分比的 PVA 混合物在纤维结构、机械强度和抗菌效率方面都达到了最佳特性。含有 1% BAC 的样品 H 显示出明显的细菌生长抑制效果(金黄色葡萄球菌抑制 20 mm,大肠杆菌抑制 9.2 mm),同时热稳定性(260.41 °C)和拉伸强度(12.4 MPa)也有所提高。这项研究证明了电纺丝技术在制造先进的混合纳米纤维方面的潜力,这种纤维在医疗领域有多种应用。
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引用次数: 0
Oil resistivity of fluorine-free foams stabilized by silica nanoparticles and mixture of silicone and hydrocarbon surfactants 用纳米二氧化硅颗粒及有机硅和碳氢化合物表面活性剂混合物稳定的无氟泡沫的耐油性能
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-09 DOI: 10.1007/s10971-024-06503-9
Youjie Sheng, Die Hu, Wenzhi Ma, Qian Zhao

This study aims at exploring properties of fluorine-free foams co-stabilized by nanoparticles (NPs) and surfactant. The mixed dispersion liquids composed of silica NPs, nonionic hydrocarbon surfactant (APG-0810), and organosilicon surfactant (CoatOsil-77) was prepared. The NP-intensified foams under the action of n-heptane (flammable liquid) were focused by analyzing aggregation behavior of surfactants, initial foaming height, foams drainage and decay, and single vertical film stability of the mixed dispersion liquids. The findings show that the presence of surfactants improves surface activity of water obviously. After adding NPs, the interactions between surfactant molecules are destroyed but new aggregates formed. Foaming ability decreases but stability increases significantly with increasing NP concentration. After n-heptane is added, intensified interactions exist among surfactant molecules, NPs, and oil droplet, promoting formation of some larger aggregates and increasing the surface tension and viscosity but decreasing the conductivity and foaming ability. In addition, the presence of n-heptane accelerates foam drainage and volume decay and thinning process of the vertical liquid film. NPs with an appropriate concentration can improve foaming ability, foam stability, and the corresponding oil resistivity of foam. This study can provide theoretical guidance for the development of new fluorine-free foams used for liquid fuel fire.

本研究旨在探索由纳米粒子(NPs)和表面活性剂共同稳定的无氟泡沫的特性。该研究制备了由二氧化硅 NPs、非离子烃类表面活性剂(APG-0810)和有机硅表面活性剂(CoatOsil-77)组成的混合分散液。通过分析混合分散液的表面活性剂聚集行为、初始发泡高度、泡沫排泄和衰减以及单垂直膜稳定性,重点研究了正庚烷(易燃液体)作用下的 NP 强化泡沫。研究结果表明,表面活性剂的存在明显提高了水的表面活性。添加 NPs 后,表面活性剂分子间的相互作用被破坏,但形成了新的聚集体。随着 NP 浓度的增加,起泡能力降低,但稳定性显著提高。加入正庚烷后,表面活性剂分子、NPs 和油滴之间的相互作用增强,促进形成一些较大的聚集体,表面张力和粘度增加,但传导性和起泡能力降低。此外,正庚烷的存在会加速泡沫排出和垂直液膜的体积衰减和变薄过程。适当浓度的 NPs 可提高泡沫的发泡能力、泡沫稳定性和相应的泡沫耐油性。这项研究可为开发用于液体燃料火灾的新型无氟泡沫提供理论指导。
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引用次数: 0
Study the influence of Ag+ nanoparticles on the surface of the Sr1-xAgxFeO3-δ perovskite on optical, magnetic and antibacterial properties 研究 Sr1-xAgxFeO3-δ 包晶表面的 Ag+ 纳米粒子对光学、磁学和抗菌特性的影响
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-08 DOI: 10.1007/s10971-024-06487-6
E. K. Abdel-Khalek, Abdullah H. Alluhayb, Alaa M. Younis, E. A. Mohamed

Recently, we produced low cost SrFeO3-δ perovskite with antibacterial properties. In this study to improve the antibacterial properties of SrFeO3-δ perovskite, we doped it with silver. Ag+ nanoparticles on the surface of the Sr1-xAgxFeO3-δ perovskite samples were prepared by sol-gel method. Structural properties of these samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), high-resolution TEM (HR-TEM), EDS elemental mapping and Fourier transform infrared spectrometer (FT-IR). These techniques confirmed the presence of small amount of cubic Ag spherical nanoparticles on the surface of the cubic Sr1-xAgxFeO3-δ perovskite structure. Further, X-ray photoelectron spectroscopy (XPS) for these samples revealed the presence of Ag1+ ions, oxygen vacancies and mixed valence states of Fe ions on the surface of the samples. The energy band gap of these samples was estimated using Kubelka–Munk equation and its value increased with increasing Ag up to x = 0.10. Additionally, Magnetic hysteresis (M − H) loops revealed that these samples displayed antiferromagnetic behavior with a small amount of ferromagnetic order. Finally, the antibacterial properties of these samples revealed that the antimicrobial activities were improved with increasing Ag (x = 0.10). Our results showed that Ag+ nanoparticles on the surface of the Sr1-xAgxFeO3-δ perovskite samples are a promising antimicrobial agent.

Graphical Abstract

最近,我们制备出了具有抗菌性能的低成本 SrFeO3-δ 包晶石。在本研究中,为了提高 SrFeO3-δ 包晶的抗菌性能,我们在其中掺杂了银。通过溶胶-凝胶法制备了 Sr1-xAgxFeO3-δ 包晶石样品表面的 Ag+ 纳米粒子。X 射线衍射(XRD)、透射电子显微镜(TEM)、选区电子衍射(SAED)、高分辨率 TEM(HR-TEM)、EDS 元素图谱和傅立叶变换红外光谱仪(FT-IR)对这些样品的结构特性进行了表征。这些技术证实,在立方 Sr1-xAgxFeO3-δ 包晶结构表面存在少量立方银球形纳米颗粒。此外,这些样品的 X 射线光电子能谱(XPS)显示,样品表面存在 Ag1+ 离子、氧空位和铁离子的混合价态。使用 Kubelka-Munk 方程估算了这些样品的能带隙,其值随着 Ag 的增加而增加,最高可达 x = 0.10。此外,磁滞回线(M - H)显示,这些样品显示出反铁磁性行为,同时具有少量铁磁性秩序。最后,这些样品的抗菌特性表明,抗菌活性随着 Ag 的增加而提高(x = 0.10)。我们的研究结果表明,Sr1-xAgxFeO3-δ 包晶样品表面的 Ag+ 纳米粒子是一种很有前景的抗菌剂。
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引用次数: 0
Unveiling Bi-functional potential of ZnMoO4-enriched nanoflakes modified electrodes for efficient photocatalysis and supercapacitors 揭示富含 ZnMoO4 的纳米片修饰电极在高效光催化和超级电容器方面的双功能潜力
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-07 DOI: 10.1007/s10971-024-06500-y
Sufyan Ashraf, Zeshan Ali Sandhu, Muhammad Asam Raza, Ali Haider Bhalli, Muhammad Hamayun, Adnan Ashraf, Abdullah G. Al-Sehemi

The sol-gel method was used to synthesize pure ZnO and MoO4@ZnO nanostructures for dual functionality in supercapacitors and photocatalysis. The material properties were examined using photoluminescence spectroscopy (PL), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction spectroscopy (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDX). A PL study showed the presence of an intense peak centering approximately around 405 nm, which is primarily due to the near-band edge emission of ZnO excitonic recombination. XRD confirmed the formation of the ZnMoO4 crystal system. The SEM showed uniformed nano-flakes which was validated by EDX analysis having typical peaks of Zn, O, and Mo. The synthesized materials were evaluated for bi-functional application, including energy storage and photocatalytic degradation of methylene blue (MB) under solar irradiation. The 5% MoO4@ZnO nanomaterials showed uniform nanoflakes morphology with remarkable photocatalytic as well as electrochemical excellence. Notably, the 5% MoO4@ZnO nanomaterial degraded MB about 90.02% within 200 min. Galvanostatic charge discharge (GCD) exhibited an outstanding specific capacitance of 1026 F/g at 1 A/g for 5% MoO4@ZnO. The columbic efficiency of the 5% MoO4@ZnO electrode material was assessed until 2000 cycles, that retains its stability about 87%. The cyclic voltammetry was also assessed for the calculation of specific capacitance and energy density. The 5% MoO4@ZnO depicted excellent capacitance and energy density about 915.62 F/g and 53.72 Wh/kg respectively. This study showed that 5% MoO4@ZnO is a suitable candidate with the exceptional dual function that can be employed for the development of next-generation energy storage and photocatalysis.

Graphical Abstract

采用溶胶-凝胶法合成了纯氧化锌和 MoO4@ZnO 纳米结构,用于超级电容器和光催化的双重功能。使用光致发光光谱(PL)、傅立叶变换红外光谱(FTIR)、X 射线衍射光谱(XRD)、扫描电子显微镜(SEM)和能量色散光谱(EDX)对材料特性进行了检测。聚光研究显示,在大约 405 纳米波长的中心存在一个强烈的峰值,这主要是由于氧化锌激子重组的近带边缘发射所致。XRD 证实了 ZnMoO4 晶体体系的形成。扫描电子显微镜(SEM)显示出均匀的纳米薄片,EDX 分析也验证了这一点,该分析具有典型的 Zn、O 和 Mo 峰。对合成材料的双功能应用进行了评估,包括储能和在太阳照射下光催化降解亚甲基蓝(MB)。5%的MoO4@ZnO纳米材料呈现出均匀的纳米片状形态,具有显著的光催化和电化学性能。值得注意的是,5% MoO4@ZnO 纳米材料在 200 分钟内降解了约 90.02% 的甲基溴。电静电荷放电(GCD)显示,5% MoO4@ZnO 在 1 A/g 时的比电容为 1026 F/g。对 5% MoO4@ZnO 电极材料的电容效率进行了评估,直到 2000 次循环后,其稳定性仍保持在 87% 左右。还对循环伏安法进行了评估,以计算比电容和能量密度。5%MoO4@ZnO 的电容和能量密度分别达到了 915.62 F/g 和 53.72 Wh/kg。这项研究表明,5% MoO4@ZnO 是一种具有特殊双重功能的合适候选材料,可用于开发下一代储能和光催化技术。
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引用次数: 0
Zn-doped manganese tetroxide/graphene oxide cathode materials for high-performance aqueous zinc-ion battery 用于高性能水性锌离子电池的掺锌四氧化三锰/氧化石墨烯阴极材料
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-06 DOI: 10.1007/s10971-024-06499-2
Linheng Ge, Hong Zhang, Zirui Wang, Qingli Gao, Manman Ren, Xiaoxia Cai, Qinze Liu, Weiliang Liu, Jinshui Yao

Due to its abundant zinc resources, high safety and low cost, aqueous zinc-ion batteries (AZIBs) are considered one of the most interesting lithium-ion battery replacement technologies. Herein, a novel Zn-doped cathode material is achieved via pre-intercalation of Zn2+ into the prepared manganese tetroxide (Mn3O4)/graphene oxide (GO). The pre-intercalation of Zn2+ effectively increases the lattice spacing of Mn3O4 and reduces the barrier of insertion/extraction of Zn2+, thus improving the kinetic properties of the material. Meanwhile, the conductive carbon skeleton GO successfully combines with polyethyleneimine and Mn3O4, which can expand electron and ion conductivity and avoid chemical bulk change. This unique structure enables the Zn-doped cathode a reversible specific capacity with excellent performance (170 mAh g−1 at 200 mA g−1). Furthermore, the diffusion coefficient of the Zn-doped cathode is 10−9–10−10cm−2 s−1. Therefore, this study introduces a viable approach for the practical implementation of advanced electrode materials in AZIBs applications.

Graphical Abstract

由于锌资源丰富、安全性高且成本低,锌离子水电池(AZIBs)被认为是最有趣的锂离子电池替代技术之一。本文通过在制备的四氧化三锰(Mn3O4)/氧化石墨烯(GO)中预掺杂 Zn2+ 实现了一种新型掺锌正极材料。Zn2+ 的预掺杂有效地增加了 Mn3O4 的晶格间距,降低了 Zn2+ 的插入/萃取障碍,从而改善了材料的动力学特性。同时,导电碳骨架 GO 成功地与聚乙烯亚胺和 Mn3O4 结合在一起,扩大了电子和离子的导电性,避免了化学块体变化。这种独特的结构使掺锌阴极具有可逆的比容量和优异的性能(200 mA g-1 时为 170 mAh g-1)。此外,掺锌阴极的扩散系数为 10-9-10-10cm-2 s-1。因此,这项研究为先进电极材料在 AZIBs 应用中的实际应用引入了一种可行的方法。
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引用次数: 0
La+3-doped CoFe2O4@MXene bifunctional electrocatalyst for superior OER and HER activity 掺杂 La+3 的 CoFe2O4@MXene 双功能电催化剂具有优异的 OER 和 HER 活性
IF 2.3 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Pub Date : 2024-08-05 DOI: 10.1007/s10971-024-06504-8
Sheraz Yousaf, Safaa N. Abdou, Muhammad Afaq, Mohamed M. Ibrahim, Imran Shakir, Salah M. El-Bahy, Iqbal Ahmad, Muhammad Shahid, Muhammad Farooq Warsi

The lanthanum doped cobalt ferrite (La+3-CoFe2O4) incorporated in MXene sheets bifunctional electrocatalyst was prepared and then subjected to various analyses to assess their structural, morphological, and functional group characteristics. X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) were employed for this purpose. The electrochemical performance of La-CoFe2O4@MXene was investigated in an alkaline solution to assess the bifunctional (OER/HER) performances. The results revealed that La-CoFe2O4@MXene exhibited significantly lower overpotential and a lesser Tafel slope during OER compared to both CoFe2O4 and La-CoFe2O4 materials. Similarly, during HER, La-CoFe2O4@MXene demonstrated superior performance. The electrochemical impedance (EIS) analysis was also conducted on all samples. These results indicated that the La-CoFe2O4@MXene electrocatalyst displayed reduced charge transfer resistance (2.18 Ω) and a higher exchange current density (2.94 mA cm−2) compared to its counterparts. These results collectively demonstrate the exceptional electrocatalytic behavior of La-CoFe2O4@MXene. This enhanced performance is likely attributable to the synergistic effect of lanthanum doping, which introduces defects into the material, and the presence of MXene sheets, which facilitates faster charge transfer within the electrocatalyst. To the best of our knowledge, this is the first study to explore La-CoFe₂O₄@MXene for water splitting. Our results demonstrate that this material requires significantly lower overpotential for OER and HER in an alkaline medium, showcasing its potential as an efficient and cost-effective catalyst for water splitting.

Graphical Abstract

制备了掺杂镧的钴铁氧体(La+3-CoFe2O4),并将其纳入 MXene 片状双功能电催化剂,然后对其进行了各种分析,以评估其结构、形态和官能团特征。为此采用了 X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和傅立叶变换红外 (FTIR)。研究了 La-CoFe2O4@MXene 在碱性溶液中的电化学性能,以评估其双功能(OER/HER)性能。结果表明,与 CoFe2O4 和 La-CoFe2O4 材料相比,La-CoFe2O4@MXene 在 OER 过程中的过电位明显较低,塔菲尔斜率也较小。同样,在 HER 过程中,La-CoFe2O4@MXene 也表现出卓越的性能。此外,还对所有样品进行了电化学阻抗(EIS)分析。这些结果表明,与同类样品相比,La-CoFe2O4@MXene 电催化剂显示出更低的电荷转移电阻(2.18 Ω)和更高的交换电流密度(2.94 mA cm-2)。这些结果共同证明了 La-CoFe2O4@MXene 的卓越电催化性能。这种性能的增强很可能归因于镧的掺杂和 MXene 片的存在所产生的协同效应,镧的掺杂会在材料中引入缺陷,而 MXene 片的存在则会促进电荷在电催化剂中的快速转移。据我们所知,这是第一项探索用于水分离的 La-CoFe₂O₄@MXene 的研究。我们的研究结果表明,在碱性介质中,这种材料的 OER 和 HER 所需的过电位明显较低,这展示了它作为一种高效、经济的水分离催化剂的潜力。
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Journal of Sol-Gel Science and Technology
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