IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-24 DOI: 10.1016/j.carbon.2025.121097

Yadong Li , Yajuan Zhang , Liang Lv , Liuyuan Han , Zhen Guo , Han-Pu Liang , Xilong Wang , Yousheng Yin

The rational design of Pt-based alloy electrocatalysts is vital to improve the durability and performance of proton exchange membrane fuel cells (PEMFCs). However, the instability caused by transition metal leaching and insufficient particle confinement remains a major challenge. Herein, the development of highly dispersed PtFe alloys with rare-earth Gd doping and carbon confinement (PtFeGd_x/N–C) by a synergistic strategy of coordination engineering and Gd–O species incorporation is reported. A nitrogen-doped porous carbon support was synthesized via pyrolysis of ZIF-8 precursors containing EDTA-FeNa and Gd(NO₃)₃, yielding uniformly dispersed Gd–Fe oxide domains. Subsequent wet impregnation and in situ alloying with H₂PtCl₆ generated highly dispersed PtFeGd_x nanoparticles. The optimized PtFeGd40/N–C catalyst exhibited a high half-wave potential of 0.94 V and a mass activity of 0.94 A mg_Pt⁻¹, with only 0.5 % activity loss after 100,000 durability cycles. Structural characterizations confirmed strong coordination among Pt, Fe, and Gd, with Gd predominantly present as oxidized species. DFT calculations revealed that Gd and Gd–O doping effectively modulate the Pt d-band center, optimize intermediate adsorption energies, and reduce the reaction barrier to 0.332 eV. This work highlights the synergistic role of rare-earth doping and carbon confinement in enhancing ORR activity and stability, offering a promising strategy for the development of durable Pt-based electrocatalysts for PEMFCs.

合理设计pt基合金电催化剂对提高质子交换膜燃料电池（pemfc）的耐久性和性能至关重要。然而，过渡金属浸出和颗粒约束不足引起的不稳定性仍然是主要的挑战。本文采用配位工程和Gd - o掺杂的协同策略，开发了稀土Gd掺杂碳约束的高分散PtFe合金（PtFeGdx/ N-C）。以含edta - fea和Gd(NO3)3的ZIF-8为前驱体，通过热解合成了氮掺杂多孔碳载体，生成了均匀分散的Gd - fe氧化物结构域。随后湿浸渍和原位合金化H2PtCl6生成高度分散的PtFeGdx纳米颗粒。优化后的PtFeGd40/ N-C催化剂具有0.94 V的高半波电位和0.94 a mgPt−1的质量活性，在10万次耐久性循环后活性损失仅为0.5%。结构表征证实了Pt， Fe和Gd之间的强配位，其中Gd主要以氧化态存在。DFT计算表明，Gd和Gd - o掺杂有效地调节了Pt d带中心，优化了中间吸附能，将反应势垒降低到0.332 eV。这项工作强调了稀土掺杂和碳约束在提高ORR活性和稳定性方面的协同作用，为开发耐用的基于pt的pemfc电催化剂提供了一个有希望的策略。

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引用次数: 0

Electrical detection of magnetization switching in single-molecule magnets 单分子磁体磁化开关的电检测

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-24 DOI: 10.1016/j.carbon.2025.121093

Amjad Alqahtani , DaVonne Henry , Lubomír Havlíček , Luke St Marie , Jakub Hrubý , Antonín Sojka , Morgan Hale , Samuel Felsenfeld , Abdelouahad El Fatimy , Rachael L. Myers-Ward , D. Kurt Gaskill , Ivan Nemec , Petr Neugebauer , Amy Y. Liu , Paola Barbara

Single-molecule magnets (SMMs) with chemically tailorable properties are potential building blocks for quantum computing, high-density magnetic memory, and spintronics. These applications require isolated or few molecules on substrates, but studies of SMMs have mainly focused on bulk crystals. Moreover, fabrication of SMM-based devices and electrical detection of the SMM magnetic state are still coveted milestones that have so far been achieved mainly for double-decker rare-earth phthalocyanines at temperatures below 1 K. Here we demonstrate electrical detection of magnetization switching for a modification of the archetypal SMM Mn₁₂, up to 70 K, based on the supramolecular spin valve effect with graphene quantum dots. Notably, the exchange interaction between the molecules and the graphene, as well as the dot-mediated intermolecular interaction, can be directly extracted from the electrical response, opening the way to an effective characterization of the quantum properties of different types of SMMs in a wide temperature range.

具有可定制化学性质的单分子磁体（SMMs）是量子计算、高密度磁存储器和自旋电子学的潜在构建块。这些应用需要在衬底上分离或少量分子，但smm的研究主要集中在体晶体上。此外，基于SMM的器件的制造和SMM磁态的电检测仍然是令人垂涎的里程碑，到目前为止，主要是在低于1k的温度下实现双层稀土酞菁。在这里，我们展示了基于石墨烯量子点的超分子自旋阀效应，对原型SMM Mn12的磁化开关进行高达70 K的电检测。值得注意的是，分子与石墨烯之间的交换相互作用，以及点介导的分子间相互作用，可以直接从电响应中提取出来，为在宽温度范围内有效表征不同类型smm的量子特性开辟了道路。

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引用次数: 0

Micronized PET plastic waste-derived carbon dots with enhanced photoluminescence: A comparative analysis 微粉化PET塑料废弃物衍生碳点的增强光致发光：比较分析

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-22 DOI: 10.1016/j.carbon.2025.121078

Mitzi Guadalupe Saldivar-Omaña, Ana G. Rodríguez-Hernández, Gustavo A. Hirata, Prakhar Sengar, Kanchan Chauhan

Developing high-performance carbon dots (CDs) from PET waste offers a sustainable approach to reduce plastic pollution and generate value-added nanomaterials. However, use of bulk bottle scraps may cause inconsistent optical properties due to uncontrolled precursor size and uneven reaction conditions. This study introduces micronized PET (M-PET) as a size-controlled precursor for more uniform heat and oxidant diffusion during synthesis. A side-by-side comparison of surface oxidation (H₂O₂) and N-doping (ethylene diamine, EDA) was conducted using both bulk PET cuttings (C-PET) and M-PET. M-PET-derived CDs exhibited smaller sizes, higher crystallinity, and enhanced surface functionalization, resulting in stronger blue photoluminescence under UV light. N-doped CDs also presented additional emission in the near-infrared region. The CDs showed a graphitic carbon framework with abundant oxygenated groups, however, O-content was significantly higher in M-PET-H₂O₂ sample. Notably, M-PET-derived N-doped CDs contained higher graphitic N content, while bulk counterparts were richer in pyrrolic N. The quantum yield of M-PET-H₂O₂ (∼52 %) and M-PET-EDA (∼12 %) was ∼2.4-fold higher than the bulk counterparts. While the highest luminescence output was observed for M-PET-H₂O₂ CDs, they also exhibited excitation-independent emission, stable fluorescence across physiological pH, excellent biocompatibility in both RAW-Blue and epithelial cells. Meanwhile, N-doped CDs demonstrated pH- and excitation-dependent emission and notable cytotoxicity in epithelial cells but minimal immunogenicity in RAW-Blue cells. Both the CDs showed selective detection of Fe³⁺, Cu²⁺, and Ni²⁺ through static quenching mechanism highlighting potential for environmental monitoring. Overall, this approach contributes to the development of a scalable and sustainable platform for high-performance nanomaterial synthesis from PET waste.

从PET废料中开发高性能碳点（cd）为减少塑料污染和产生增值纳米材料提供了一种可持续的方法。然而，由于前驱体尺寸不受控制和反应条件不均匀，使用散装瓶废料可能导致光学性质不一致。本研究介绍了微晶PET （M-PET）作为一种尺寸可控的前驱体，在合成过程中使热量和氧化剂的扩散更加均匀。使用大块PET岩屑（C-PET）和M-PET进行了表面氧化（H2O2）和n掺杂（乙二胺，EDA）的并排比较。m - pet衍生的CDs具有更小的尺寸，更高的结晶度和增强的表面功能化，在紫外光下产生更强的蓝色光致发光。n掺杂的CDs在近红外区域也有额外的发射。cd为石墨碳骨架，含氧基团丰富，而M-PET-H2O2样品的o含量明显较高。值得注意的是，m - pet衍生的N掺杂CDs含有更高的石墨N含量，而体状对应物则含有更丰富的吡啶N。M-PET-H2O2（~ 52%）和M-PET-EDA（~ 12%）的量子产率比体状对应物高~ 2.4倍。虽然M-PET-H2O2 CDs的发光输出最高，但它们也具有非激发性发光，在生理pH值范围内具有稳定的荧光，在RAW-Blue和上皮细胞中具有良好的生物相容性。同时，n掺杂的CDs在上皮细胞中表现出pH依赖性和兴奋依赖性，具有显著的细胞毒性，但在RAW-Blue细胞中具有最小的免疫原性。这两种CDs都可以通过静态猝灭机制选择性检测Fe3+、Cu2+和Ni2+，突出了环境监测的潜力。总的来说，这种方法有助于开发一个可扩展和可持续的平台，用于从PET废物中合成高性能纳米材料。

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引用次数: 0

Enhanced microwave absorption performance of lightweight, heat-insulating and flame retardant CoMo-LDO@Co/C aerogel through multiphase heterojunctions engineering and synergistic effect 通过多相异质结工程和协同效应增强了轻质隔热阻燃CoMo-LDO@Co/C气凝胶的微波吸收性能

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-19 DOI: 10.1016/j.carbon.2025.121084

Mingwei Zhang, Liwen Chen, Zizhao Ding, Zixiang Zhao, Chao Jiang

The design method that can fully utilize the characteristics of dielectric material and magnetic material, and still maintain the microwave absorption performance under external force has strategic significance. In this research, a composite material of metal-organic framework (MOF) and layered double hydroxide (LDH) was prepared. Their derivatives obtained by high-temperature annealing were combined with polyvinyl alcohol (PVA) and sodium alginate (SA), and then freeze-dried to produce CoMo-LDO@Co/C PVA/SA aerogel. Through the synergistic effect of dielectric loss and magnetic loss and the unique semiconductor/carbon and metal/semiconductor phases, as well as the improvement of aerogel in impedance matching, the minimum reflection loss of aerogel reaches −52.74 dB at a thickness of 2.36 mm, and the widest effective absorption bandwidth (EAB) at 2.60 mm is 7.93 GHz. Notably, the aerogel remains a EAB of 6.86 GHz at the thickness of 2.01 mm when the compressive strain reaches 50 %. This is mainly due to the enhanced attenuation capability, which compensates for the deteriorated impedance matching. Also, aerogel performs well in terms of pressure resistance, heat insulation, flame retardancy and lightweight. The compressive strength of PSCMC-2 is 5.21 MPa. Its density is about 139.10 mg·cm⁻³ and the thermal conductivity coefficient can reach 0.068 W·m⁻¹·K⁻¹. This work provides effective strategies and solutions for developing multifunctional microwave absorbing materials applicable in complex environments.

这种既能充分利用介电材料和磁性材料的特性，又能在外力作用下保持微波吸收性能的设计方法具有战略意义。本研究制备了一种金属有机骨架（MOF）和层状双氢氧化物（LDH）的复合材料。通过高温退火得到的它们的衍生物与聚乙烯醇（PVA）和海藻酸钠（SA）结合，然后冷冻干燥制得CoMo-LDO@Co/C PVA/SA气凝胶。通过介质损耗和磁损耗的协同作用以及独特的半导体/碳相和金属/半导体相，以及气凝胶在阻抗匹配方面的改进，气凝胶在厚度为2.36 mm时的最小反射损耗达到−52.74 dB，在2.60 mm处的最宽有效吸收带宽（EAB）为7.93 GHz。值得注意的是，当压缩应变达到50%时，气凝胶在厚度为2.01 mm时仍保持6.86 GHz的EAB。这主要是由于增强的衰减能力，这弥补了阻抗匹配的恶化。此外，气凝胶在耐压、隔热、阻燃和轻质方面表现良好。PSCMC-2抗压强度为5.21 MPa。其密度约为139.10 mg·cm−3，导热系数可达0.068 W·m−1·K−1。本研究为开发适用于复杂环境的多功能吸波材料提供了有效的策略和解决方案。

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引用次数: 0

Construction of Co-hollow carbon nanofibers with tunable inner pore diameters via coaxial electrospinning toward highly efficient microwave absorption 同轴静电纺丝法制备内径可调co -中空碳纳米纤维的高效微波吸收

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-19 DOI: 10.1016/j.carbon.2025.121085

Zhe Zhang , Zicheng Shan , Jianguang Huang , Pengjun Chai , Li Pei , Guoliang Zhang , Xinhui Cao , Zeyu Sun , Hui Zhang , Liying Zhang , Jianyong Yu

The integration of multi-component composites with tailored microstructure designs has emerged as a highly effective strategy to enhance the microwave absorption performance of materials. In this work, we presented the fabrication of Co-hollow carbon nanofibers (Co-HCNFs) through in-situ coaxial electrospinning and subsequent carbonization, utilizing ZIF-67 as a self-sacrificing precursor in the shell solution and polyvinylpyrrolidone (PVP) as the core solution. This process yielded small Co nanoparticles uniformly embedded on the HCNFs, with the pore diameter controlled by the removal of different concentrations of PVP. By systematically studying the electromagnetic properties of samples with different inner pore diameters, the effect of microstructure design on the microwave absorption of Co-HCNFs was elucidated. Results showed that larger inner pore diameters significantly boosted the absorption performance, with the optimal sample achieving a minimum reflection loss (RL_min) of −51.5 dB at 1.5 mm thickness and an effective absorption bandwidth (EAB) of 5.3 GHz at 1.7 mm thickness. This enhancement was attributed to optimal impedance matching, achieved by combining magnetic Co nanoparticles with a conductive carbon matrix, coupled with intensified multiple reflections and scattering within the hollow architecture. Furthermore, a flexible composite film fabricated from these Co-HCNFs via hot-pressing demonstrated a robust RL_min of −22.6 dB and an EAB of 4.3 GHz at 1.0 mm thickness, alongside a tensile strength of 8.3 MPa and an elastic modulus of 52.8 MPa, highlighting the potential of Co-HCNF composites for practical microwave absorption applications.

多组分复合材料与定制微结构设计的集成已成为提高材料微波吸收性能的有效策略。本研究以ZIF-67为自我牺牲前驱体，聚乙烯吡罗烷酮（PVP）为核心溶液，采用原位共轴静电纺丝和炭化法制备Co-HCNFs。该工艺得到了均匀嵌套在HCNFs上的小Co纳米颗粒，其孔径由不同浓度PVP的去除来控制。通过系统研究不同内孔径样品的电磁特性，阐明了微观结构设计对Co-HCNFs微波吸收的影响。结果表明，较大的内孔径显著提高了样品的吸收性能，最优样品在1.5 mm厚度时的最小反射损耗（RLmin）为- 51.5 dB，在1.7 mm厚度时的有效吸收带宽（EAB）为5.3 GHz。这种增强归功于最佳的阻抗匹配，通过将磁性Co纳米颗粒与导电碳基体结合，再加上空心结构内增强的多次反射和散射。此外，由这些Co-HCNF通过热压制成的柔性复合膜在1.0 mm厚度下显示出- 22.6 dB的稳定RLmin和4.3 GHz的EAB，以及8.3 MPa的抗拉强度和52.8 MPa的弹性模量，突出了Co-HCNF复合材料在实际微波吸收应用中的潜力。

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引用次数: 0

Mechanism analysis of large-scale heteroepitaxial diamond solar-blind ultraviolet photodetectors with ultralow dark current 大型异质外延金刚石超低暗电流日盲紫外探测器机理分析

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-19 DOI: 10.1016/j.carbon.2025.121082

Hongda Zhu , Shilin Yang , Chufei Cheng , Saifei Fan , Yitong Zheng , Bing Dai , Yicun Li , Jiaqi Zhu

Diamond serves as an ideal platform for solar-blind ultraviolet (SBUV) photodetectors owing to its ultra-wide bandgap, high carrier mobility, and radiation hardness. However, the absence of large, cost-effective bulk substrates has impeded large-scale diamond fabrication. This study reports the first demonstration of an SBUV metal–semiconductor–metal (MSM) photodetector based on heteroepitaxial single-crystal diamond grown on Ir/Al₂O₃ substrates. The film, produced via epitaxial lateral overgrowth (ELO), exhibits a low etch pit density and a sharp diamond Raman peak, thereby confirming high film quality. Photoluminescence analysis indicates the presence of only weak NV⁰/NV⁻ and SiV⁻ centers within the film, further affirming its crystalline integrity. Additionally, MSM devices with Ti/Pt interdigitated electrodes on top of the fabricated diamond film demonstrate an exceptionally low dark current (8.6 × 10⁻¹⁴ A at 20 V), a UV/visible rejection ratio of approximately 10³, and a responsivity reaching 0.34 A W⁻¹ at 220 nm (equivalent to an external quantum efficiency of approximately 192 %), with a detectivity of 5.4 × 10¹² Jones. Moreover, the carrier transport mechanisms under varying temperature conditions are analyzed to gain insight into optimization directions. These findings substantiate the potential of heteroepitaxial diamond as a promising wafer-scale platform for SBUV detection and offer mechanistic insights to inform future defect-reduction strategies aimed at advancing high-speed, high-reliability optoelectronic devices.

金刚石由于其超宽带隙、高载流子迁移率和辐射硬度而成为太阳盲紫外（SBUV）光电探测器的理想平台。然而，缺乏大型的，具有成本效益的大块衬底阻碍了大规模的金刚石制造。本研究报道了基于Ir/Al2O3衬底上生长的异质外延单晶金刚石的SBUV金属-半导体-金属（MSM）光电探测器的首次演示。通过外延横向过度生长（ELO）制备的薄膜具有低蚀刻坑密度和锋利的金刚石拉曼峰，从而证实了高质量的薄膜。光致发光分析表明，薄膜内仅存在弱的NV0/NV -和SiV -中心，进一步证实了其晶体完整性。此外，在制备的金刚石薄膜上带有Ti/Pt交叉电极的MSM器件显示出极低的暗电流（在20 V时为8.6 × 10−14 A），紫外/可见光抑制比约为103，响应率在220 nm处达到0.34 A W−1（相当于约192%的外量子效率），探测率为5.4 × 1012琼斯。分析了不同温度条件下的载流子输运机制，为优化方向提供依据。这些发现证实了异质外延金刚石作为一种有前途的晶圆级SBUV检测平台的潜力，并为未来旨在推进高速、高可靠性光电器件的缺陷减少策略提供了机制见解。

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引用次数: 0

Chirality control in amino acid-capped carbon dots: Insights into the passivation reaction mechanism and engineering asymmetric catalysis 氨基酸包覆碳点的手性控制：钝化反应机理和工程不对称催化的新见解

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-19 DOI: 10.1016/j.carbon.2025.121079

Yaxin Ding , Ji Shen , Meichen Liu , Chunli Xu

Understanding the fundamental processes behind the formation of carbon dots (CDs) is critical for advancing highly asymmetric catalytic systems. This study investigates the formation mechanism and the influence of chiral sources by synthesizing chiral CDs using hydroquinone as the carbon source and a series of primary amino acids with different substituents as chiral sources. It is revealed that the substituents of amino acids significantly influence the size, morphology, and asymmetric catalytic activity of CDs through chemical bonding interactions and steric hindrance effects. Stronger bonding or reduced steric hindrance leads to smaller CDs, which exhibit enhanced catalytic performance. Additionally, the substituents of amino acids determine the properties of capping reaction and catalytic active sites of CDs. Notably, CDs derived from d-aspartic acid and d-serine demonstrate superior asymmetric catalytic activity compared to their chiral small molecule precursors, challenging the conventional belief that heterogenous catalysts, including CDs, exhibit lower catalytic efficiency than small molecules. This finding provides new insights into the passivation reaction mechanism and new approaches to engineer the chirality for advancing asymmetric catalytic activity.

了解碳点（CDs）形成背后的基本过程对于推进高度不对称催化体系至关重要。本研究以对苯二酚为碳源，一系列不同取代基的伯胺为手性源，合成手性CDs，探讨手性源的形成机理及影响。结果表明，氨基酸取代基通过化学键相互作用和位阻效应显著影响CDs的尺寸、形态和不对称催化活性。更强的键合或更低的位阻导致cd更小，表现出更高的催化性能。此外，氨基酸的取代基决定了CDs的盖顶反应性质和催化活性位点。值得注意的是，从d-天冬氨酸和d-丝氨酸衍生的CDs与其手性小分子前体相比，表现出更强的不对称催化活性，挑战了包括CDs在内的多相催化剂比小分子催化效率低的传统观点。这一发现为钝化反应机理的研究提供了新思路，为提高不对称催化活性提供了手性设计的新途径。

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引用次数: 0

Highly dispersed and low-cost N-doped carbon dots enhancing the hydration kinetics of tricalcium silicate: A multiscale investigation 高分散低成本n掺杂碳点增强硅酸三钙水化动力学：多尺度研究

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-19 DOI: 10.1016/j.carbon.2025.121083

Haijie He , Xiangzhi Wang , Yangrui Wang , Jie Hong , Shuang E , Lei Xu , Chuang He

Carbon dots (CDs), as an innovative nanomaterial exhibiting superior dispersion properties and exceptional economic efficiency, display unique potential for application in regulating cement hydration. Nevertheless, the precise mechanism by which CDs affect cement hydration kinetics has yet to be fully elucidated. This research for the first time uncovers the impacts and regulatory mechanisms of CDs on tricalcium silicate (C₃S) hydration utilizing a multiscale methodology that combines micro characterization with molecular dynamics (MD) simulations. Specifically, N-doped CDs (NCDs) are deliberately synthesized via a hydrothermal synthesis approach and showcase good dispersion stability within saturated Ca(OH)₂ solution. Experimental findings show that adding 0.1 wt% NCDs reduces the hydration induction period of C₃S by 0.9 h relative to pure C₃S pastes, elevates the peak heat flow by 12 %, and substantially increases the Ca²⁺ concentration throughout hydration. Micro characterization analyses indicate that NCDs enhance both the formation and densification of calcium silicate hydrate (C–S–H), yielding a thicker layer of hydration products. Moreover, NCDs diminish the average silicate chain length within C–S–H while augmenting its structural disorganization. Mechanistic exploration elucidates that NCDs achieve dual modulation of the C₃S dissolution-nucleation process, both by accelerating C₃S dissolution and functioning as nucleation sites exhibiting strong adsorption toward silicate tetrahedral units through electrostatic and van der Waals forces. This work systematically clarifies the action mechanism of NCDs, offering fresh perspectives for advancing nano-modified cementitious materials.

碳点作为一种新型纳米材料，具有优异的分散性能和优异的经济效益，在调节水泥水化方面具有独特的应用潜力。然而，CDs影响水泥水化动力学的确切机制尚未完全阐明。本研究首次利用微表征与分子动力学模拟相结合的多尺度方法揭示了CDs对硅酸三钙水化的影响及其调控机制。具体来说，n掺杂CDs （NCDs）是通过水热合成方法合成的，并在饱和Ca(OH)2溶液中表现出良好的分散稳定性。实验结果表明，与纯C3S膏体相比，添加0.1 wt% NCDs可使C3S的水化诱导期缩短0.9 h，峰值热流提高12%，且在整个水化过程中Ca2+浓度大幅提高。微观表征分析表明，NCDs增强了水化硅酸钙（C-S-H）的形成和致密化，产生了更厚的水化产物层。此外，NCDs减少了C-S-H内的硅酸盐平均链长，增加了其结构的无序性。机制探索表明，NCDs实现了C3S溶解成核过程的双重调制，既加速了C3S的溶解，又通过静电和范德华力对硅酸盐四面体单元表现出强烈的吸附，成为成核位点。本研究系统地阐明了非传染性疾病的作用机制，为推进纳米改性胶凝材料提供了新的视角。

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引用次数: 0

Comparative study on the corrosion inhibition performance of hydrophilic and amphiphilic carbon dots in hydrochloric acid medium 亲水与两亲碳点在盐酸介质中的缓蚀性能比较研究

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-18 DOI: 10.1016/j.carbon.2025.121080

Maoxin Cai , Ping Mei , Lu Lai

In this work, hydrophilic carbon dots (H-CDs) were initially prepared via a solvothermal approach, and subsequently modified by attaching hydrophobic groups to obtain amphiphilic carbon dots (A-CDs). H-CDs and A-CDs exhibit distinct corrosion inhibition effects on N80 steel in hydrochloric acid medium. Their corrosion inhibition performances were systematically compared through weight loss test, electrochemical measurement, and surface characterization analysis. Effective corrosion inhibition was observed even at a dosage as low as 25 mg/L. When the dosage was further increased to 100 mg/L, the inhibitory efficiency of H-CDs and A-CDs was 72.91 % and 90.58 %, respectively. The results indicate that A-CDs have better corrosion inhibition performance than H-CDs, with an efficiency slightly lower than that of the commercial corrosion inhibitor (92.14 %). The corrosion inhibition role of H-CDs and A-CDs can be attributed to their ability to adsorb on the N80 steel surface through physical and chemical interactions, thereby forming a protective film that hinders the penetration of the corrosive medium. The contact angle of the N80 surface treated with H-CDs decreased from 86.5° to 59.8°, whereas it increased to 106.5° after treatment with A-CDs. This indicates that a hydrophobic film was formed following A-CDs treatment, which is more effective in isolating the corrosive medium compared to the hydrophilic film formed by H-CDs. Therefore, A-CDs have a more excellent corrosion inhibition effect. This work provides new perspectives on developing environmentally friendly corrosion inhibitors derived carbon dots.

在这项工作中，亲水碳点（H-CDs）最初通过溶剂热方法制备，随后通过连接疏水基团修饰得到两亲性碳点（a - cds）。H-CDs和A-CDs在盐酸介质中对N80钢具有明显的缓蚀作用。通过失重试验、电化学测量和表面表征分析，系统地比较了它们的缓蚀性能。即使在低至25 mg/L的剂量下，也观察到有效的缓蚀作用。当剂量进一步增加到100 mg/L时，H-CDs和A-CDs的抑制率分别为72.91%和90.58%。结果表明，A-CDs的缓蚀性能优于H-CDs，其缓蚀效率略低于商用缓蚀剂（92.14%）。H-CDs和a - cds的缓蚀作用可归因于它们能够通过物理和化学相互作用吸附在N80钢表面，从而形成一层保护膜，阻碍腐蚀介质的渗透。H-CDs处理后N80表面的接触角从86.5°减小到59.8°，而A-CDs处理后N80表面的接触角增加到106.5°。这表明a - cds处理后形成疏水膜，与H-CDs形成的亲水膜相比，对腐蚀介质的隔离效果更好。因此，a - cds具有更优异的缓蚀效果。本研究为开发环境友好型碳点缓蚀剂提供了新的思路。

{"title":"Comparative study on the corrosion inhibition performance of hydrophilic and amphiphilic carbon dots in hydrochloric acid medium","authors":"Maoxin Cai , Ping Mei , Lu Lai","doi":"10.1016/j.carbon.2025.121080","DOIUrl":"10.1016/j.carbon.2025.121080","url":null,"abstract":"<div><div>In this work, hydrophilic carbon dots (H-CDs) were initially prepared via a solvothermal approach, and subsequently modified by attaching hydrophobic groups to obtain amphiphilic carbon dots (A-CDs). H-CDs and A-CDs exhibit distinct corrosion inhibition effects on N80 steel in hydrochloric acid medium. Their corrosion inhibition performances were systematically compared through weight loss test, electrochemical measurement, and surface characterization analysis. Effective corrosion inhibition was observed even at a dosage as low as 25 mg/L. When the dosage was further increased to 100 mg/L, the inhibitory efficiency of H-CDs and A-CDs was 72.91 % and 90.58 %, respectively. The results indicate that A-CDs have better corrosion inhibition performance than H-CDs, with an efficiency slightly lower than that of the commercial corrosion inhibitor (92.14 %). The corrosion inhibition role of H-CDs and A-CDs can be attributed to their ability to adsorb on the N80 steel surface through physical and chemical interactions, thereby forming a protective film that hinders the penetration of the corrosive medium. The contact angle of the N80 surface treated with H-CDs decreased from 86.5° to 59.8°, whereas it increased to 106.5° after treatment with A-CDs. This indicates that a hydrophobic film was formed following A-CDs treatment, which is more effective in isolating the corrosive medium compared to the hydrophilic film formed by H-CDs. Therefore, A-CDs have a more excellent corrosion inhibition effect. This work provides new perspectives on developing environmentally friendly corrosion inhibitors derived carbon dots.</div></div>","PeriodicalId":262,"journal":{"name":"Carbon","volume":"247 ","pages":"Article 121080"},"PeriodicalIF":11.6,"publicationDate":"2025-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145576731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Heterointerface-composites of g-C3N4/Bi2O3 multidimensional nanohybrids for diffusion-dominant asymmetric supercapacitors: A modulation toward architected redox-capacitive synergy g-C3N4/Bi2O3多层纳米杂化材料的异质界面复合材料的扩散主导型非对称超级电容器：对结构氧化还原-电容协同的调制

IF 11.6 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon

Pub Date : 2025-11-17 DOI: 10.1016/j.carbon.2025.121073

Rutuja U. Amate , Pritam J. Morankar , Aviraj M. Teli , Mrunal K. Bhosale , Sonali A. Beknalkar , Chan-Wook Jeon

Strategizing interfacial synergies between redox-active and conductive nanostructures presents an emerging strategy to transcend intrinsic limitations of conventional supercapacitor electrodes. Herein, we report hierarchically integrated graphitic carbon nitride/bismuth oxide (g-C₃N₄/Bi₂O₃) heterostructured nanocomposites as high-performance supercapacitor electrodes. A dual-step strategy was employed to obtain 2D g-C₃N₄ nanosheets and 1D Bi₂O₃ nanorods. Three stoichiometries were evaluated, with the g-B-2 composition (g-C₃N₄:Bi₂O₃ = 1:3) yielding optimal electrochemical behavior. Structural analysis revealed uniformly dispersed α- Bi₂O₃ nanorods embedded within 2D g-C₃N₄ matrix, forming highly interconnected interface that facilitates rapid ion diffusion and electronic transport. The g-B-2 electrode delivered superior charge storage behavior with specific capacitance of 1208 F g⁻¹ (2486 mF cm⁻²)) at 8 mA, high energy density of 20.556 Wh/kg, and excellent cycling durability. Kinetic analysis revealed dominant diffusion-controlled faradaic contribution, elevated OH⁻ ion diffusion coefficients, and significant electrochemically active surface area (286.5 cm²), highlighting synergistic interplay of capacitive and pseudocapacitive processes. Furthermore, when assembled into an asymmetric supercapacitor device (g-B-2//AC), the hybrid system operated efficiently at 1.5 V, delivering exceptional power and energy performance metrics, and remarkable stability (>88 % retention over 10,000 cycles). This study elucidates the critical role of nanoscale interface engineering in augmenting electrochemical performance and positions g-C₃N₄/Bi₂O₃ hybrids as a promising paradigm for next-generation high-rate energy storage systems.

设计氧化还原活性纳米结构和导电纳米结构之间的界面协同作用是一种新兴的策略，可以超越传统超级电容器电极的固有局限性。在此，我们报告了分层集成的石墨氮化碳/氧化铋（g-C3N4/Bi2O3）异质结构纳米复合材料作为高性能超级电容器电极。采用双步法制备了二维g-C3N4纳米片和一维Bi2O3纳米棒。三种化学计量学评价表明，g-B-2组成（g-C3N4:Bi2O3 = 1:3）产生最佳的电化学行为。结构分析表明，均匀分散的α- Bi2O3纳米棒嵌入二维g-C3N4基体中，形成高度互连的界面，有利于离子的快速扩散和电子输运。g- b -2电极具有优异的电荷存储性能，在8 mA时的比电容为1208 F g−1 (2486 mF cm−2)，高能量密度为20.556 Wh/kg，并且具有优异的循环耐久性。动力学分析显示，扩散控制的法拉第贡献占主导地位，OH -离子扩散系数升高，电化学活性表面积显著（286.5 cm2），突出了电容性和伪电容性过程的协同相互作用。此外，当组装成非对称超级电容器器件（g-B-2//AC）时，混合系统在1.5 V下高效运行，提供卓越的功率和能量性能指标，以及卓越的稳定性（10,000次循环保持88%）。该研究阐明了纳米级界面工程在提高电化学性能方面的关键作用，并将g-C3N4/Bi2O3杂化材料定位为下一代高速率储能系统的有前途的范例。

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