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Fluorinated reduced graphene oxide nanosheets for symmetric supercapacitor device performance 实现对称超级电容器器件性能的氟化还原氧化石墨烯纳米片

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-05 DOI: 10.1016/j.flatc.2024.100757

Vediyappan Thirumal , Bathula Babu , Planisamy Rajkumar , Jin-Ho Kim , Kisoo Yoo

This study explores the potential of using spent lithium-ion battery anodes (graphite) for fabricating symmetric energy devices through a simple regeneration process. Specifically, the use of fluorine-doped reduced graphene oxide (RGO) nanosheets derived from waste batteries as the basis for a symmetric supercapacitor (SC) device is investigated. To enhance the electrochemical energy storage capabilities, a facile hydrothermal technique is employed to synthesize fluorinated graphene. Fluorination of the graphene sheets is successfully realized, as confirmed by the presence of boron with a 2.94 at.% fluorine-doped level, according to the Energy dispersive spectroscopy (EDS) spectrum analysis. Electrochemical analysis of the F-RGO electrode performance consistent with electric double-layer capacitance. Moreover, with a three-electrode system, the F-RGO electrode achieves a maximum specific capacitance of 207F/g under a current density of 1 A/g. A two-electrode symmetric device employing F-RGO exhibits a specific capacitance of 54F/g at 1 A/g. Furthermore, electrochemical impedance measurements demonstrate low charge transfer resistance (Rct) values, specifically 8.63 Ω for F-RGO, signifying improved electrochemical performance. Thus, fluorine atomic doping in RGO nanosheets contributes to the improvements of the specific capacitance and overall superior electrochemical performance of F-RGO, and F-RGO is a highly electrochemical active material for high-performance energy storage electrodes for SCs.

本研究通过简单的再生过程，探索了利用废旧锂离子电池阳极（石墨）制造对称能源装置的潜力。具体来说，研究了使用从废电池中提取的掺氟还原氧化石墨烯（RGO）纳米片作为对称超级电容器（SC）装置的基础。为了增强电化学储能能力，采用了一种简便的水热技术来合成氟化石墨烯。根据能量色散光谱（EDS）谱分析，掺氟水平为 2.94 at.% 的硼的存在证实了石墨烯片的氟化已成功实现。对 F-RGO 电极进行的电化学分析表明，该电极具有双层电容。此外，在三电极系统中，当电流密度为 1 A/g 时，F-RGO 电极的最大比电容为 207F/g。采用 F-RGO 的双电极对称装置在 1 A/g 电流密度下的比电容为 54F/g。此外，电化学阻抗测量结果表明，F-RGO 的电荷转移电阻（Rct）值较低，具体为 8.63 Ω，这表明其电化学性能得到了改善。因此，在 RGO 纳米片中掺入氟原子有助于提高 F-RGO 的比电容和整体优异的电化学性能，F-RGO 是一种用于高性能 SC 储能电极的高电化学活性材料。

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引用次数: 0

Investigating the role of graphene in the formation and stability of β-phase antimonene islands 研究石墨烯在β相锑岛的形成和稳定性中的作用

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-10-05 DOI: 10.1016/j.flatc.2024.100754

M. Guadalupe Gómez-Farfán , L. Avilés-Félix , Esteban D. Cantero , Esteban A. Sánchez , Laura N. Serkovic-Loli

Two-dimensional materials have shown tremendous potential for various technological applications. Particularly, 2D antimony exhibits high applicability in electronics, sensors, and batteries. This 2D material, known as antimonene, presents two stable phases:

α

(rectangular lattice) and

β

(honeycomb lattice), whose formation depends on the substrate where antimony is deposited. In this study, we investigated the growth of antimonene islands on graphene, forming an antimonene/graphene heterostructure. To demonstrate the significance of graphene in the synthesis of antimonene, we also studied antimony deposited on a bare copper foil similar to the one used for the graphene substrate. Antimony deposition exhibits the

β

phase antimonene structure when deposited on top of monolayer graphene, but not when deposited on a bare copper foil, nor on top of multilayer graphene. Additionally, we investigated the stability of the heterostructure after exposure to air. Pure antimony islands are formed when evaporated in high vacuum on top of graphene and copper substrates, and antimony atoms oxidize upon exposure to air. After annealing the sample in ultra-high-vacuum at temperatures lower than 200

°

C, more than half of pure antimony is recovered and almost all oxidized antimony is desorbed from the graphene substrate. In contrast, almost none of the oxidized antimony is desorbed from the bare copper substrate, highlighting the key role of the heterostructure on the formation and preservation of the physical and chemical properties of the deposited 2D material.

二维材料在各种技术应用中显示出巨大的潜力。尤其是二维锑，在电子、传感器和电池领域具有很高的应用价值。这种被称为锑的二维材料呈现出两种稳定相：α（矩形晶格）和β（蜂窝晶格），其形成取决于沉积锑的基底。在本研究中，我们研究了锑岛在石墨烯上的生长，形成了锑/石墨烯异质结构。为了证明石墨烯在锑的合成中的重要性，我们还研究了沉积在裸铜箔上的锑，该铜箔与石墨烯基底所用的铜箔类似。当锑沉积在单层石墨烯上面时，会呈现出 β 相锑结构，而沉积在裸铜箔上或多层石墨烯上面时则不会。此外，我们还研究了异质结构暴露在空气中后的稳定性。在高真空中蒸发到石墨烯和铜基底上时，会形成纯粹的锑岛，暴露在空气中时锑原子会氧化。样品在温度低于 200 °C 的超高真空中退火后，一半以上的纯锑被回收，几乎所有氧化锑都从石墨烯基底中解吸出来。相比之下，几乎没有氧化锑从裸铜基底中解吸出来，这凸显了异质结构在形成和保持沉积二维材料的物理和化学特性方面的关键作用。

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引用次数: 0

Exploring the potential of α-Ge(1 1 1) monolayer in photocatalytic water splitting for hydrogen production 探索α-Ge（1 1 1）单层在光催化水分离制氢中的潜力

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-09-29 DOI: 10.1016/j.flatc.2024.100753

Vinícius G. Garcia , Guilherme J. Inacio , Luciano F. Filho , Luíza T. Pacheco , Fernando N.N. Pansini , Marcos G. Menezes , Wendel S. Paz

In this study, the structural, electronic, and optical properties of 2D α-Ge(1 1 1) are investigated using Density Functional Theory (DFT) calculations, complemented by many-body perturbation theory calculations based on the GW/BSE approach. The thermodynamic stability of this material is assessed through ab initio molecular dynamics simulations (AIMD), and their dynamic stability is confirmed via phonon dispersion calculations. The analysis of the optical properties reveals significant absorption peaks in both visible and ultraviolet regions, with an absorption edge at 47 eV (1.87 eV without excitonic effects). The band edges are well-aligned with water redox potentials at neutral pH, making them suitable for water-splitting applications. For other pH levels, we find the process may be feasible through the participation of different excited states populated by light absorption. Remarkably, the α-Ge(1 1 1) monolayer demonstrates a predicted solar-to-hydrogen conversion efficiency of 34.80 %, outperforming many other two-dimensional materials. These findings position the α-Ge(1 1 1) monolayer as a promising candidate for developing efficient photocatalytic materials for hydrogen generation via overall water splitting.

本研究利用密度泛函理论（DFT）计算，并辅以基于 GW/BSE 方法的多体扰动理论计算，研究了二维 α-Ge（1 1 1）的结构、电子和光学特性。通过原子分子动力学模拟 (AIMD) 评估了这种材料的热力学稳定性，并通过声子色散计算证实了其动态稳定性。光学特性分析表明，该材料在可见光和紫外光区域都有明显的吸收峰，吸收边缘为 47 eV（无激子效应时为 1.87 eV）。在中性 pH 值下，吸收带边缘与水的氧化还原电位完全一致，因此适合用于水分离应用。对于其他 pH 值，我们发现通过光吸收填充的不同激发态的参与，该过程可能是可行的。值得注意的是，α-Ge（1 1 1）单层的太阳能-氢气转换效率预计可达 34.80%，超过了许多其他二维材料。这些发现将α-Ge(1 1 1)单层定位为开发高效光催化材料的理想候选材料，可通过整体水分裂产生氢气。

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引用次数: 0

Exploring phosphorene-protein interactions: An integrated computational and spectroscopic investigation 探索磷烯与蛋白质的相互作用：计算与光谱学综合研究

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-09-26 DOI: 10.1016/j.flatc.2024.100752

Silvia Rinaldi , Amalia Malina Grigoras , Maria Caporali , Manuel Serrano-Ruiz , Maurizio Peruzzini , Andrea Ienco , Loredana Latterini

Among 2D materials, exfoliated black phosphorus (or phosphorene) shows great promise for applications in biological domains. However, despite its performances, little is known about the intricate and dynamic interactions that this material can form with proteins. This increases the risk of off-target effects and adds complexity in designing phosphorene-based devices with tailored properties. In this study, we present a straightforward and easily implementable pipeline that integrates spectroscopies with Molecular Dynamics simulations to explore the dynamic interplay between phosphorene and a protein system. Using lysozyme as a deeply investigated reference protein, we employed two theoretical protein models with unique secondary structure folds to increase the descriptive power of the approach and disentangle the complexity and variability of experimental data into a few primary drivers of protein-phosphorene interactions. Our results show that the 2D material does not significantly alter the protein structure, but the observed conformational changes are influenced by the secondary fold. Indeed, while the beta structure interacts mainly through unfolded regions, the alpha fold favours phosphorene binding through structured clusters of residues, leading to more significant structural and dynamic perturbations. By utilizing this pipeline, we have gained valuable insights into the molecular recognition mechanism of phosphorene, enhancing the development of improved phosphorene-based devices. In addition, our methodology offers potential for further applications in biomedicine to characterise interfaces between other 2D (nano)materials and biological entities.

在二维材料中，剥离黑磷（或磷烯）在生物领域的应用前景广阔。然而，尽管这种材料性能卓越，但人们对其与蛋白质之间错综复杂的动态相互作用却知之甚少。这增加了产生脱靶效应的风险，也增加了设计具有定制特性的基于磷烯的器件的复杂性。在本研究中，我们提出了一种简单易行的方法，将光谱学与分子动力学模拟相结合，探索磷烯与蛋白质系统之间的动态相互作用。以溶菌酶作为深入研究的参考蛋白质，我们采用了两种具有独特二级结构褶皱的理论蛋白质模型，以提高该方法的描述能力，并将实验数据的复杂性和可变性分解为蛋白质-磷烯相互作用的几个主要驱动因素。我们的研究结果表明，二维材料不会显著改变蛋白质结构，但观察到的构象变化受到二级折叠的影响。事实上，β结构主要通过未折叠区域发生相互作用，而α折叠则倾向于通过结构化的残基簇结合膦，从而导致更显著的结构和动态扰动。通过利用这一管道，我们获得了有关磷烯分子识别机制的宝贵见解，从而促进了基于磷烯的改良设备的开发。此外，我们的方法还具有进一步应用于生物医学的潜力，可用于表征其他二维（纳米）材料与生物实体之间的界面。

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引用次数: 0

Effect of interlayer stacking arrangement on the dielectric properties of hexagonal boron nitride thin films 层间堆叠排列对六方氮化硼薄膜介电性能的影响

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-09-26 DOI: 10.1016/j.flatc.2024.100751

Mina Maruyama, Susumu Okada

Electrostatic properties of hexagonal boron nitride (hBN) thin films with different stacking arrangements were investigated using density functional theory combined with the effective screening medium method. Our calculations showed that the dielectric properties across layers of hBN thin films are sensitive to both the interlayer stacking arrangement and the number of layers. The polarization of bilayer hBN gradually decreases with increasing lateral displacement from AB stacking, and polarity inversion occurs for particular stacking arrangements. The polarity of bilayer hBN is sensitive to twisting displacement. The polarity monotonically increases with increasing the number of layers in hBN films with rhombohedral stacking arrangement.

我们使用密度泛函理论结合有效屏蔽介质法研究了具有不同堆叠排列的六方氮化硼（hBN）薄膜的静电特性。计算结果表明，氮化硼薄膜的跨层介电特性对层间堆叠排列和层数都很敏感。双层 hBN 的极化随着 AB 层堆叠横向位移的增加而逐渐减小，在特定的堆叠排列中会出现极性反转。双层氢化硼的极性对扭曲位移很敏感。在具有斜方堆积排列的 hBN 薄膜中，极性随着层数的增加而单调增加。

引用次数: 0

Highly porous Pt3Ni nanosheets for enhanced hydrogen evolution reaction 用于增强氢气进化反应的高孔隙 Pt3Ni 纳米片

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-09-24 DOI: 10.1016/j.flatc.2024.100750

Mrinal Kanti Kabiraz , Hafidatul Wahidah , Jong Wook Hong , Sang-Il Choi

Two-dimensional (2D) nanosheets with high surface-to-volume ratios have garnered significant attention for their electrocatalytic properties. This study explores the characterization and electrocatalytic performance of highly porous monometallic platinum (Pt) nanosheets and bimetallic platinum-nickel (Pt₃Ni) nanosheets for the hydrogen evolution reaction (HER) in both alkaline and acidic media. Advanced characterization techniques were employed to elucidate the morphological and compositional properties of the Pt and Pt₃Ni nanosheets. Electrochemical characterization demonstrated that Pt₃Ni nanosheets/C outperformed Pt nanosheets/C and commercial Pt/C in terms of HER activity and stability. The enhanced HER performance of Pt₃Ni nanosheets/C is believed to be due to the dominance of the Volmer-Tafel mechanism. These findings highlight the potential of 2D bimetallic nanosheets and suggest a promising avenue for advancing hydrogen energy technologies.

具有高表面体积比的二维（2D）纳米片因其电催化特性而备受关注。本研究探讨了高多孔单金属铂（Pt）纳米片和双金属铂镍（Pt3Ni）纳米片在碱性和酸性介质中进行氢进化反应（HER）的表征和电催化性能。研究人员采用了先进的表征技术来阐明铂和铂镍纳米片的形态和组成特性。电化学表征结果表明，就 HER 活性和稳定性而言，Pt3Ni 纳米片/C 优于 Pt 纳米片/C 和商用 Pt/C。Pt3Ni 纳米片/C 增强的 HER 性能被认为是由于 Volmer-Tafel 机制的主导作用。这些发现凸显了二维双金属纳米片的潜力，并为推动氢能技术的发展提供了一条前景广阔的途径。

引用次数: 0

In-situ Profiling of Environmental Hazardous Sulfamethoxazole in Aquatic and Artificial Saliva samples Using Perovskite Structured Bismuth Ferrite Incorporated Halloysite Nanotubes 利用包晶结构铋铁氧体掺杂霍洛石纳米管原位分析水生样本和人工唾液样本中的环境有害物质磺胺甲噁唑

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-09-20 DOI: 10.1016/j.flatc.2024.100749

Muthumariappan Akilarasan , Santhiyagu Sahayaraj Rex Shanlee , Shen-Ming Chen , Wasif Farooq , Pichai Christina Ruby Stella

Sulfamethoxazole (SMX), a widely used antibiotic, poses significant environmental and health risks due to its persistence and mobility in water systems, potentially leading to antibiotic resistance and ecological harm. Herein, we developed an electrochemical sensor based on Bismuth Ferrite (BiFeO₃)/Halloysite Nanotube (BFO/HNT) composite for sensitive and selective SMX detection. The BFO/HNT composite was synthesized via a hydrothermal method and comprehensively characterized using EDS mapping, HRTEM, XRD, FT-IR, and XPS analysis. The BFO/HNT composite enhances the sensor’s performance due to its unique properties, such as increased electrochemical surface area (ECSA) and efficient electron transfer capability. The B-cation (Fe) in the BiFeO₃ matrix plays a crucial role in boosting the electrochemical response by facilitating redox reactions. In addition, the HNTs provide a high surface area and excellent adsorption capabilities, which improve the sensor’s sensitivity by facilitating better interaction with SMX molecules. As the results, the prepared sensor demonstrates an impressive linear detection range of 0.01 to 2 µM and 22 to 122 µM, with a detection limit as low as 0.017 µM. Practical applications were validated by detecting SMX in tap water and artificial saliva, achieving high recovery rates of 98.87 % and 99.11 %.

磺胺甲噁唑（SMX）是一种广泛使用的抗生素，由于其在水系统中的持久性和流动性，对环境和健康构成了重大风险，有可能导致抗生素耐药性和生态危害。在此，我们开发了一种基于铋铁氧体（BiFeO3）/海泡石纳米管（BFO/HNT）复合材料的电化学传感器，用于灵敏、选择性地检测 SMX。BFO/HNT 复合材料是通过水热法合成的，并使用 EDS 图谱、HRTEM、XRD、FT-IR 和 XPS 分析对其进行了全面表征。BFO/HNT 复合材料因其独特的性能而提高了传感器的性能，例如增加了电化学表面积（ECSA）和高效的电子传递能力。BiFeO3 基质中的 B 阳离子（Fe）通过促进氧化还原反应，在提高电化学响应方面发挥了关键作用。此外，HNT 具有高比表面积和出色的吸附能力，能更好地与 SMX 分子相互作用，从而提高传感器的灵敏度。结果表明，所制备的传感器的线性检测范围为 0.01 至 2 µM 和 22 至 122 µM，检测限低至 0.017 µM。通过检测自来水和人工唾液中的 SMX，实际应用得到了验证，回收率高达 98.87 % 和 99.11 %。

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引用次数: 0

G-C3N4 tubes decorated with MnMoO4·H2O: Outstanding S-scheme photocatalyst for detoxification of water pollutants upon visible light 用 MnMoO4-H2O 装饰的 G-C3N4 管：利用可见光解毒水污染物的杰出 S 型光催化剂

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-09-14 DOI: 10.1016/j.flatc.2024.100738

Zahra Lahootifar , Aziz Habibi-Yangjeh , Zahra Salmanzadeh-Jamadi , Alireza Khataee

Recently, the utilization of heterogeneous photocatalysts has been proposed as an effective solution for environmental purification, as one of the solar energy conversion processes, under mild conditions. In this research, MnMoO₄·H₂O nanoparticles were anchored on tubular g-C₃N₄ (abbreviated as TGCN) by a one-pot hydrothermal route. The phase structure, electronic environment, spectroscopic characteristics, composition, morphology, surface area, and electrochemical properties of the resultant materials were explored using XRD, XPS, EDX, FESEM, HRTEM, FTIR, PL, photocurrent, EIS, and BET analyses. The photocatalytic activity of TGCN/MnMoO₄·H₂O (20 %) nanocomposite was 4.25, 5.36, 9.07, 12.4, and 8.84 times better than modified GCN, and 3.91, 2.77, 6.24, 10.9, and 6.82 times higher than MnMoO₄·H₂O in removals of tetracycline, rhodamine B, methylene blue, methyl orange, and fuchsine pollutants, respectively. The improved visible-light absorption and rapid charge migration/separation between TGCN and MnMoO₄·H₂O counterparts through S-scheme heterojunction route were the key reasons for the boosted photocatalytic performance. The biocompatibility of solution after decomposition of tetracycline via the growth of wheat seeds was verified. Finally, the stability of the binary TGCN/MnMoO₄·H₂O (20 %) heterostructure was measured by the stability test after four reuses.

最近，有人提出利用异相光催化剂作为一种有效的环境净化解决方案，并将其作为温和条件下的太阳能转换过程之一。本研究采用一锅水热法将 MnMoO4-H2O 纳米粒子锚定在管状 g-C3N4（简称 TGCN）上。通过 XRD、XPS、EDX、FESEM、HRTEM、FTIR、PL、光电流、EIS 和 BET 分析，研究了所得材料的相结构、电子环境、光谱特性、成分、形貌、比表面积和电化学性能。TGCN/MnMoO4-H2O (20 %) 纳米复合材料的光催化活性分别是改性 GCN 的 4.25 倍、5.36 倍、9.07 倍、12.4 倍和 8.84 倍，在去除四环素、罗丹明 B、亚甲基蓝、甲基橙和紫红色污染物方面分别是 MnMoO4-H2O 的 3.91 倍、2.77 倍、6.24 倍、10.9 倍和 6.82 倍。TGCN 和 MnMoO4-H2O 对应物通过 S 型异质结途径改善了可见光吸收和快速电荷迁移/分离是光催化性能提高的关键原因。通过小麦种子的生长验证了四环素分解后溶液的生物相容性。最后，通过四次重复使用后的稳定性测试，测量了二元 TGCN/MnMoO4-H2O (20 %) 异质结构的稳定性。

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引用次数: 0

Green synthesis of Z-scheme N-doped g-C3N4/Nd-doped ZnO heterostructure by pomegranate waste peel with enhanced photocatalytic performance for organic pollutants removal and antibacterial activity 利用石榴废皮绿色合成 Z 型 N 掺杂 g-C3N4/Nd 掺杂 ZnO 异质结构，提高光催化去除有机污染物的性能和抗菌活性

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-09-10 DOI: 10.1016/j.flatc.2024.100736

Seyed Ali Zargar , Mitra Gharivi , Omid Bagheri , Adrine Malek Khachatourian , Ali Hashemi

Nowadays, the growing global population and increased industrialization have exacerbated water pollution, posing a significant environmental threat. To tackle this issue, there is an urgent need for effective catalysts to remove pollutants. This study developed a novel N-doped g-C₃N₄/Nd-doped ZnO (NZ) heterostructure using a green approach by incorporating pomegranate peel waste as a stabilizing and capping agent. Characterization techniques confirmed successful NZ nanohybrid preparation. The synthesized NZ displayed high photocatalytic activity in degrading methylene blue (MB) and tetracycline (TC) pollutants found in wastewater, achieving degradation efficiencies of 95.3 % and 98.3 %, respectively. Meanwhile, it demonstrated satisfactory photostability after five-cycle experiments. The radical trapping experiments revealed that superoxide (O₂⁻) and hydroxyl (OH) are the dominant active species and play an essential role in photocatalytic pollutant deterioration. Additionally, it exhibited suitable antimicrobial activity against Staphylococcus aureus and Vibrio cholerae bacterial strains. The enhanced performance is attributed to the abundant reaction sites of porous N-doped g-C₃N₄, the photo-redox capability of Nd-doped ZnO, and the efficient charge separation process in the Z-type heterojunction. This work advances sustainable and eco-friendly chemistry for the biosynthesis of organic/inorganic heterojunctions used in pollutant degradation and bacterial disinfection of wastewater.

如今，全球人口的不断增长和工业化进程的加快加剧了水污染，对环境构成了严重威胁。为解决这一问题，迫切需要有效的催化剂来去除污染物。本研究采用绿色方法，将石榴皮废料作为稳定剂和封盖剂，开发出一种新型的掺杂 N 的 g-C3N4 掺杂 Nd 的氧化锌（NZ）异质结构。表征技术证实了 NZ 纳米杂化的成功制备。合成的 NZ 在降解废水中的亚甲基蓝（MB）和四环素（TC）污染物方面具有很高的光催化活性，降解效率分别达到 95.3 % 和 98.3 %。同时，经过五次循环实验后，它还表现出令人满意的光稳定性。自由基捕获实验表明，超氧化物（O2-）和羟基（OH）是主要的活性物种，在光催化污染物降解过程中发挥着重要作用。此外，它还对金黄色葡萄球菌和霍乱弧菌菌株表现出适当的抗菌活性。性能的提高归功于多孔 N 掺杂 g-C3N4 的丰富反应位点、Nd 掺杂 ZnO 的光氧化还原能力以及 Z 型异质结中高效的电荷分离过程。这项工作推动了可持续的生态友好型化学，促进了用于污染物降解和废水细菌消毒的有机/无机异质结的生物合成。

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引用次数: 0

Fabrication of nickel oxide decorated CNTs/GO nanohybrid: A multifunctional electrocatalyst for overall electrochemical water splitting 制备氧化镍装饰的 CNTs/GO 纳米杂化物：用于整体电化学水分离的多功能电催化剂

IF 5.9 3区材料科学 Q2 CHEMISTRY, PHYSICAL

FlatChem

Pub Date : 2024-09-07 DOI: 10.1016/j.flatc.2024.100732

Satam Alotibi , Awais Khalid , Eddie Gazo Hanna , Zaid M. Aldhafeeri , Mudassir Hasan , Tuba Al Haq , Abid Ali

Hydrogen production from water as renewable energy resource is vital to fulfil the huge energy demands without any hazardous environmental impact. Pursuing the efficient, durable and economical electrocatalyst other than benchmark expensive materials such as Pt, Ru, and Ir, for water electrolysis is a big challenge to produce the hydrogen as clean fuels. Here, we have successfully decorated nickel oxides nanoparticles over the carbon nanotubes covered by the graphene oxide layers (GO/NiO@CNTs/GO) using a facile hydrothermal method and utilized as electrocatalyst for electrochemical water splitting. The surface morphology and structure was assessed using a variety of analytical techniques, including scanning electron microscopy (SEM), energy dispersive X-rays spectroscopy (EDX) and X-ray diffraction (XRD). As prepared nanohybrid (GO/NiO@CNTs/GO) was utilized as multifunctional electrocatalyst to investigate the water electrolysis potential via different electrochemical techniques including linear sweep voltammetry (LSV), and cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and chronoamperometry. The fabricated electrode exhibited a lower overpotential of 236 mV and 208 mV at the standard current density of 10 mAcm⁻² under alkaline and acidic conditions, respectively. Enhanced double layer capacitance (C_dl) and reduced charge transfer resistance (R_ct) also showed the boosted performance for the hybrid materials with long term stability. The carbon based nanohybrid (GO/NiO@CNTs/GO) showed the promising potential having multifunctional characteristics including oxygen and hydrogen evolution reactions along with overall electrochemical water splitting.

利用水这种可再生能源生产氢气对于满足巨大的能源需求而又不对环境造成任何有害影响至关重要。除了铂、钌和铱等基准昂贵材料外，寻求高效、耐用和经济的电催化剂用于水电解是生产氢气这种清洁燃料的一大挑战。在此，我们采用简便的水热法成功地在氧化石墨烯层覆盖的碳纳米管上装饰了镍氧化物纳米颗粒（GO/NiO@CNTs/GO），并将其用作电化学水分离的电催化剂。利用扫描电子显微镜（SEM）、能量色散 X 射线光谱（EDX）和 X 射线衍射（XRD）等多种分析技术对其表面形貌和结构进行了评估。利用制备的纳米杂化物（GO/NiO@CNTs/GO）作为多功能电催化剂，通过不同的电化学技术，包括线性扫描伏安法（LSV）、循环伏安法（CV）、电化学阻抗谱法（EIS）和时变法，研究水的电解电位。在碱性和酸性条件下，当标准电流密度为 10 mAcm-2 时，所制备电极的过电位分别为 236 mV 和 208 mV。增强的双层电容（Cdl）和降低的电荷转移电阻（Rct）也显示了混合材料性能的提高和长期稳定性。碳基纳米杂化材料（GO/NiO@CNTs/GO）具有多功能特性，包括氧气和氢气的进化反应以及整体电化学水分离，显示出巨大的潜力。

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引用次数: 0