Diamond and Related Materials最新文献

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Stacking-faults consisting of rhombohedral stacking-order, hexagonal and one-dimensional moiré superlattices in exfoliated highly oriented pyrolytic graphite

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-16 DOI: 10.1016/j.diamond.2025.112212

Filippo S. Boi , Li Lei , Aiqun Gu , Jian Guo , Hansong Wu , Shanling Wang

Understanding the stabilization of rhombohedral stacking-order and moiré superlattices in structural defects produced by exfoliation is of importance towards applications in nanoscale low-dimensional systems and superconductivity. Here we report a statistical investigation of the stabilization-dynamics of rhombohedral ABC stacking-faults within locally-lifted sublattices, fabricated by exfoliation of highly oriented pyrolytic graphite (HOPG). Raman point/mapping spectroscopy applied to several tens of locally-lifted lattice-regions reveal a weak enhancement of the ratio of the integral area of the 2D band-components, namely within the frequency range from ∼2550 to 2670 cm⁻¹ (left shoulder) to that from ∼2670 to 2760 cm⁻¹ (right shoulder). A structural transition is demonstrated with HRTEM revealing the coexistence of hexagonal and one-dimensional moiré superlattices with periods D-1–2.04 nm, D-2–2.35 nm (coexisting superlattice-periodicities) and D ∼ 13 nm in the stacking-fault regions. Interestingly, selective area electron diffraction (SAED) of the latter revealed unusual doubled electron diffraction patterns. Stabilization of micron-scale stacking-faults of crystalline rhombohedral graphite (ABC stacking) was found as an additional transition, when applying the lifting approach to staircase-defects. Comparative investigations performed on commercially available grafoil revealed a different trend, with the presence of a disorder-rich rhombohedral graphitic phase compatible with a defective A|ABAB|BCBC|CACA|A stacking-sequence, analogous to that reported previously in other grafoil samples and in nitrates intercalated graphite.

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引用次数: 0

Hydrothermal sulfonation of palm kernel shells to produce a carbon-based solid acid catalyst for the glycerol etherification

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-16 DOI: 10.1016/j.diamond.2025.112217

Artit Ausavasukhi , Tawan Sooknoi

Carbon-based solid acid catalysts were successfully prepared by one-step hydrothermal sulfonation of palm kernel shells. Among the solid acids studied, the catalysts with acidity and hydrophobic/hydrophilic balance were found to be more selective and efficient catalytic systems for the conversion of glycerol to glycerol ethers. The stability of the carbon-based solid acid catalyst was confirmed by a regeneration test, which showed that no leaching of acid groups into solution occurs. In addition, the carbon-based solid acid catalyst prepared by one-step hydrothermal sulfonation at 160 °C exhibits good cyclability. The etherification of glycerol with tertiary butanol occurs in a truly heterogeneous process in the presence of such an acid carbon.

引用次数: 0

Fermi level modulation for enhanced graphene-based ultra-sensitive gas detection

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-16 DOI: 10.1016/j.diamond.2025.112214

Ravi Ranjan Kumar, Deepak Punetha

The optimization of Fermi level absorptance above the Dirac point in graphene is crucial for enhancing its gas sensing capabilities. Graphene's exceptional electrical and optical properties make it highly suitable for optoelectronics and sensing applications. This study examines the relationship between the Fermi level and graphene's optical absorptance, particularly at 0.2 eV, to maximize its interaction with electromagnetic radiation. Simulations were conducted across 0–5 THz frequencies, analyzing the impact of substrate thickness and Fermi energy. Results indicate that higher Fermi levels significantly enhance absorptance, with peak values of 0.99826 at 0.5 eV for a 39 μm substrate. Notably, at 0.2 eV, competitive absorptance is observed with a 29 μm substrate, highlighting its relevance for gas sensing. Further optimization explored the effects of rotation angle and unit cell width, revealing that a 55° rotation maximizes absorptance at 0.98384. Structural modifications also influence absorption across frequencies. This research establishes a framework for tuning graphene's absorptance at 0.2 eV, crucial for improving the sensitivity of gas sensors. The findings hold significance for developing advanced optoelectronic devices in environmental monitoring, healthcare, and industrial applications, where Fermi level tuning can enhance performance.

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引用次数: 0

Recent advances and challenges in tribology of diamond-like carbon films: A critical review

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-15 DOI: 10.1016/j.diamond.2025.112206

Yunhai Liu, Xinwei Li, Penghui Xu, Hu Zhang, Ligao Liu

Friction consumes 33–50 % of global primary energy, causing about 80 % of mechanical fail. Therefore, reducing friction is vital for save energy and extending service life. Diamond-like carbon (DLC) films have broad industrial prospects due to their low friction coefficient and high wear resistance. This article discusses the state and challenges in tribology of DLC films, focusing on how their structure and external conditions affect tribological mechanisms. Firstly, the article discusses how deposition process affects the tribological properties. Subsequently, the influence of external factors on the tribological properties is discussed. Additionally, the article covers recent advances in molecular dynamics and first-principles calculations, crucial for understanding the micro and nanoscale tribological mechanisms. Finally, Summarizing current DLC film tribology research, the article outlines future research priorities and directions.

引用次数: 0

Controlling the number of layers of Mo-grown CVD graphene through the catalyst thickness 通过催化剂厚度控制 Mo-grown CVD 石墨烯的层数

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-14 DOI: 10.1016/j.diamond.2025.112195

Leandro Nicolas Sacco , Artur Dobrowolski , Bart Boshuizen , Jakub Jagiełło , Beata Pyrzanowska , Adam Łaszcz , Tymoteusz Ciuk , Sten Vollebregt

Depending on the applications based on graphene, single-layer or few-layer graphene would be more beneficial. Ideally, graphene could be nucleated directly with the required thickness. However, some aspects related to graphene thickness and uniformity control still need to be solved. This work aims to better understand graphene formation using Mo thin films as a catalyst. The grown graphene films were characterized using SEM, TEM, XPS, AFM, standard Raman spectroscopy and 3D Raman surface imaging. A correlation between the catalyst thickness and the number of layers is established. All the characterization techniques show that the number of graphene layers inversely scales with the Mo catalyst thickness used for the graphene synthesis. Then, by simply adjusting the catalyst thickness, the number of graphene layers can be engineered from few-layer graphene (FLG) up to multi-layer graphene (MLG). A pinhole distribution of 1 % was detected on the films synthesized on 50 nm and 100 nm Mo thicknesses after the catalyst was etched. On the synthesized FLG (500 nm Mo), no holes were observed on the surface film after the etching process and even after a transfer onto another substrate. These results can enable the formation of FLG with a controlled thickness and good uniformity.

根据基于石墨烯的应用，单层或少层石墨烯更有优势。理想情况下，石墨烯可以直接成核，并达到所需的厚度。然而，与石墨烯厚度和均匀性控制相关的一些问题仍有待解决。这项研究旨在更好地了解以 Mo 薄膜为催化剂的石墨烯形成。利用扫描电镜、电子显微镜、XPS、原子力显微镜、标准拉曼光谱和三维拉曼表面成像对生长的石墨烯薄膜进行了表征。催化剂厚度与层数之间建立了相关性。所有表征技术都表明，石墨烯层的数量与用于合成石墨烯的 Mo 催化剂厚度成反比。因此，只需调整催化剂厚度，石墨烯的层数就可以从几层石墨烯（FLG）增加到多层石墨烯（MLG）。催化剂蚀刻后，在 50 nm 和 100 nm Mo 厚度合成的薄膜上检测到 1 % 的针孔分布。在合成的 FLG（500 nm Mo）上，蚀刻过程结束后，甚至在转移到另一个基底上后，表面薄膜上都没有观察到孔洞。这些结果使 FLG 的形成具有可控的厚度和良好的均匀性。

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引用次数: 0

Defect formation in plastically deformed natural Ib, IaAB, IaB, and low nitrogen diamonds 天然 Ib、IaAB、IaB 和低氮金刚石中塑性变形缺陷的形成

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-14 DOI: 10.1016/j.diamond.2025.112207

V.A. Nadolinny , Yu.N. Palyanov , M.I. Rakhmanova , Yu.M. Borzdov , A.Yu. Komarovskikh , A.P. Yelisseyev , O.P. Yurjeva , V.S. Shatsky , A.L. Ragozin

The analysis of experimental data on plastically deformed diamonds of different types Ib, IaAB, IaB, and low-nitrogen crystals has been performed. It has been established that the most characteristic defects in plastically deformed diamonds are broken bonds in the dislocation cores. These defects appear in electron paramagnetic resonance (EPR) as a single line with a g-factor of 2.0031 and in luminescence as a vibronic system with a zero-phonon line (ZPL) at 490.7 nm. During plastic deformation, atomic planes slide affecting extended defects such as nitrogen A and B centers, leading to their destruction. For A centers, one of the nitrogen atoms can be displaced by 2.5 Å or greater, forming pairs of impurity atoms separated by two or more carbon atoms. For these paired defects, electron transfer from one of the nitrogen atoms to the broken bonds in the dislocation cores occurs, resulting in the formation of charge transfer complexes. The charge transfer optical band observed in the absorption spectra, which has a maximum at 550 nm, is responsible for the brownish color of these crystals. When the slip planes involve B centers, their destruction leads to the formation of N₃V and C centers. Both the N₃V and C centers exist in a non-paramagnetic state due to the transfer of an electron from the donor nitrogen to the N₃V center. Plastically deformed type IaB crystals are colorless or exhibit a slight bluish tinge due to the formation of N₃V centers. In the case of type Ib diamonds, impurity nitrogen is primarily present in the form of C centers, which act as electron donors for acceptors such as the broken bonds in the dislocation cores. Consequently, for plastically deformed type Ib crystals, the N⁺ nitrogen state is detected, which anneals out at temperatures above 2100 °C, specifically in the temperature range when dislocations are destroyed.

对不同类型的 Ib、IaAB、IaB 和低氮晶体的塑性变形金刚石的实验数据进行了分析。已经确定，塑性变形金刚石中最具特征性的缺陷是位错核心中的断裂键。这些缺陷在电子顺磁共振（EPR）中表现为一条 g 因子为 2.0031 的单线，在发光中表现为一个振动系统，在 490.7 纳米处有一条零声子线（ZPL）。在塑性变形过程中，原子平面滑动会影响延伸缺陷，如氮 A 和 B 中心，导致其破坏。对于 A 中心，其中一个氮原子的位移可以达到或超过 2.5 Å，从而形成由两个或更多碳原子分隔的成对杂质原子。对于这些成对的缺陷，电子会从其中一个氮原子转移到位错核心的断裂键上，从而形成电荷转移复合物。在吸收光谱中观察到的电荷转移光带在 550 纳米波长处具有最大值，是这些晶体呈现棕色的原因。当滑移面涉及 B 中心时，它们的破坏会导致 N3V 和 C 中心的形成。由于电子从供体氮转移到 N3V 中心，N3V 和 C 中心都以非顺磁性状态存在。经过塑性变形的 IaB 型晶体是无色的，或者由于 N3V 中心的形成而呈现出轻微的蓝色。在 Ib 型金刚石中，杂质氮主要以 C 中心的形式存在，C 中心是位错核心断裂键等受体的电子供体。因此，对于塑性变形的 Ib 型晶体，可以检测到 N+ 氮状态，这种状态在 2100 °C 以上的温度下退火，特别是在位错被破坏的温度范围内。

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引用次数: 0

Synergistic effects of composite partnering between fluorine doped tin oxide and bio-derived activated carbon for enhanced photocatalytic dye detoxification

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-13 DOI: 10.1016/j.diamond.2025.112202

S. Karthikadevi , S. Mullainathan , T.R. Rajaganesh , P.K. Praseetha , R. Swarna Lakshmi , R. Shalini , K. Ravichandran

In recent decades, water contamination resulting from the discharge of industrial organic dye wastes becomes a serious threat to the environment, requiring urgent remedy. In this state of affairs, the present study focuses on the modification of SnO₂ by adding fluorine as dopant and plantain flower waste derived activated carbon (PFAC) as composite partner so as to make the material suitable for effective dye detoxification. The nanocomposite was synthesized via soft chemical method and characterized using XRD, FTIR, UV–Vis, SEM, EDAX, Hall effect and XPS studies. The synthesized nanocomposite SnO₂:F/PFAC effectively degrades methylene blue (MB) and methyl orange (MO) dyes under visible light. The SnO₂:F/PFAC nanocomposite shows significant higher photocatalytic efficiency of 98.8 % against MB and 92.2 % against MO dye. The heterojunction formation between the composite partners SnO₂:F and PFAC helps for harvesting an enhanced amount of visible light and for reducing the charge recombination rate. The stability test showed that the nanocomposite SnO₂:F/PFAC retains its performance even in the fifth cycle without appreciable loss in efficiency. In addition to the photocatalytic ability, the electrochemical property of the nanocomposite was also studied. The results showed that the nanocomposite SnO₂:F/PFAC can be a potential candidate for photocatalytic dye degradation and electrochemical applications.

{"title":"Synergistic effects of composite partnering between fluorine doped tin oxide and bio-derived activated carbon for enhanced photocatalytic dye detoxification","authors":"S. Karthikadevi , S. Mullainathan , T.R. Rajaganesh , P.K. Praseetha , R. Swarna Lakshmi , R. Shalini , K. Ravichandran","doi":"10.1016/j.diamond.2025.112202","DOIUrl":"10.1016/j.diamond.2025.112202","url":null,"abstract":"<div><div>In recent decades, water contamination resulting from the discharge of industrial organic dye wastes becomes a serious threat to the environment, requiring urgent remedy. In this state of affairs, the present study focuses on the modification of SnO<sub>2</sub> by adding fluorine as dopant and plantain flower waste derived activated carbon (PFAC) as composite partner so as to make the material suitable for effective dye detoxification. The nanocomposite was synthesized via soft chemical method and characterized using XRD, FTIR, UV–Vis, SEM, EDAX, Hall effect and XPS studies. The synthesized nanocomposite SnO<sub>2</sub>:F/PFAC effectively degrades methylene blue (MB) and methyl orange (MO) dyes under visible light. The SnO<sub>2</sub>:F/PFAC nanocomposite shows significant higher photocatalytic efficiency of 98.8 % against MB and 92.2 % against MO dye. The heterojunction formation between the composite partners SnO<sub>2</sub>:F and PFAC helps for harvesting an enhanced amount of visible light and for reducing the charge recombination rate. The stability test showed that the nanocomposite SnO<sub>2</sub>:F/PFAC retains its performance even in the fifth cycle without appreciable loss in efficiency. In addition to the photocatalytic ability, the electrochemical property of the nanocomposite was also studied. The results showed that the nanocomposite SnO<sub>2</sub>:F/PFAC can be a potential candidate for photocatalytic dye degradation and electrochemical applications.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"154 ","pages":"Article 112202"},"PeriodicalIF":4.3,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642889","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Effective hydrogen production with OER using g-CN-supported vanadium oxide as electrocatalyst

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-12 DOI: 10.1016/j.diamond.2025.112201

Sumia Rubab , Samira Elaissi , Tahani Rahil Aldhafeeri , Syed Kashif Ali , Abhinav Kumar

Renewable energy production is crucial in today's world due to environmental concerns like global warming and the depletion of hydrocarbon resources. In this perspective, water splitting is regarded as an advanced and ecologically friendly technique for hydrogen generation. Nevertheless, due to its slow oxygen evolution reaction (OER), the development of an electrocatalyst with exceptional efficiency is necessary for increasing the effectiveness of water splitting. The current analysis uses a simple hydrothermal technique to produce a non-noble metal-based g-CN/V₂O₅ electrocatalyst to promote the reaction efficacy. The prepared g-CN/V₂O₅ electrocatalyst was assessed using multiple electrochemical and physical approaches, which demonstrated a minimal overpotential of 189 mV, minimal onset potential (1.41 V) and a reduced Tafel gradient (33 mV dec⁻¹) to validate the improved kinetics of the reaction. The impedance results support this concept by displaying the minimal R_ct (0.56 Ω). Moreover, the produced composite material remained stable up to 40 h, as tested using a chronoamperometric approach. The integration of g-CN with pure metal oxide increases the availability of active zones for catalytic reaction and boosts the material's conductivity. Subsequently, these findings support the concept that the composite produced in this study seems to be an appropriate electrocatalyst for the OER and can also be employed in future energy generation and storage applications.

{"title":"Effective hydrogen production with OER using g-CN-supported vanadium oxide as electrocatalyst","authors":"Sumia Rubab , Samira Elaissi , Tahani Rahil Aldhafeeri , Syed Kashif Ali , Abhinav Kumar","doi":"10.1016/j.diamond.2025.112201","DOIUrl":"10.1016/j.diamond.2025.112201","url":null,"abstract":"<div><div>Renewable energy production is crucial in today's world due to environmental concerns like global warming and the depletion of hydrocarbon resources. In this perspective, water splitting is regarded as an advanced and ecologically friendly technique for hydrogen generation. Nevertheless, due to its slow oxygen evolution reaction (OER), the development of an electrocatalyst with exceptional efficiency is necessary for increasing the effectiveness of water splitting. The current analysis uses a simple hydrothermal technique to produce a non-noble metal-based g-CN/V<sub>2</sub>O<sub>5</sub> electrocatalyst to promote the reaction efficacy. The prepared g-CN/V<sub>2</sub>O<sub>5</sub> electrocatalyst was assessed using multiple electrochemical and physical approaches, which demonstrated a minimal overpotential of 189 mV, minimal onset potential (1.41 V) and a reduced Tafel gradient (33 mV dec<sup>−1</sup>) to validate the improved kinetics of the reaction. The impedance results support this concept by displaying the minimal R<sub>ct</sub> (0.56 Ω). Moreover, the produced composite material remained stable up to 40 h, as tested using a chronoamperometric approach. The integration of g-CN with pure metal oxide increases the availability of active zones for catalytic reaction and boosts the material's conductivity. Subsequently, these findings support the concept that the composite produced in this study seems to be an appropriate electrocatalyst for the OER and can also be employed in future energy generation and storage applications.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"154 ","pages":"Article 112201"},"PeriodicalIF":4.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Deposition of silver and titanium co-doped diamond-like carbon films by magnetron sputtering 磁控溅射法沉积银和钛共掺杂类金刚石碳薄膜

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-12 DOI: 10.1016/j.diamond.2025.112200

Oskars Platnieks , Hassan Zhairabany , Hesam Khaksar , Enrico Gnecco , Sergejs Gaidukovs , Edgars Vanags , Anatolijs Sarakovskis , Liutauras Marcinauskas

The aim of this study was to investigate the effects of silver and titanium co-doping on the microstructure and properties of non‑hydrogenated diamond-like carbon (DLC) films deposited via direct current magnetron sputtering. Doping levels were controlled by varying the shield opening above a silver‑titanium (50/50 at.%) target. The films were characterized using energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, atomic force microscopy, nanoindentation, and surface wetting. Co-doped metal content ranged from 2.0 at.% and 0.3 at.% to 8.2 at.% and 2.9 at.% for Ag and Ti, respectively (XPS data). Moderate doping improved hardness and elastic modulus, while higher levels induced graphitization of the doped-DLC films. Tunable friction coefficients and wettability were observed, suggesting potential applications in wear-resistant and biocompatible coatings. XPS analysis revealed the formation of carbon oxide and titanium oxide bonds with no pronounced existence of titanium carbide in the doped films. Increasing Ag and Ti content enhanced the surface roughness and promoted cluster formation in the films. This study provides valuable insights into the synergistic effects of Ag and Ti in DLC films, highlighting their versatility for advanced functional coatings.

{"title":"Deposition of silver and titanium co-doped diamond-like carbon films by magnetron sputtering","authors":"Oskars Platnieks , Hassan Zhairabany , Hesam Khaksar , Enrico Gnecco , Sergejs Gaidukovs , Edgars Vanags , Anatolijs Sarakovskis , Liutauras Marcinauskas","doi":"10.1016/j.diamond.2025.112200","DOIUrl":"10.1016/j.diamond.2025.112200","url":null,"abstract":"<div><div>The aim of this study was to investigate the effects of silver and titanium co-doping on the microstructure and properties of non‑hydrogenated diamond-like carbon (DLC) films deposited via direct current magnetron sputtering. Doping levels were controlled by varying the shield opening above a silver‑titanium (50/50 at.%) target. The films were characterized using energy-dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, atomic force microscopy, nanoindentation, and surface wetting. Co-doped metal content ranged from 2.0 at.% and 0.3 at.% to 8.2 at.% and 2.9 at.% for Ag and Ti, respectively (XPS data). Moderate doping improved hardness and elastic modulus, while higher levels induced graphitization of the doped-DLC films. Tunable friction coefficients and wettability were observed, suggesting potential applications in wear-resistant and biocompatible coatings. XPS analysis revealed the formation of carbon oxide and titanium oxide bonds with no pronounced existence of titanium carbide in the doped films. Increasing Ag and Ti content enhanced the surface roughness and promoted cluster formation in the films. This study provides valuable insights into the synergistic effects of Ag and Ti in DLC films, highlighting their versatility for advanced functional coatings.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"154 ","pages":"Article 112200"},"PeriodicalIF":4.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

ZIF-67anchored on sulfur-doped carbon nitride as oxygen evolution electrocatalysts

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials

Pub Date : 2025-03-12 DOI: 10.1016/j.diamond.2025.112193

Qinghui Zhang , Bingyu Chen , Bo Yuan , Linghui Cao , Yongheng Huo , Aijuan Xie , Shiping Luo

MOF materials can change their electrical conductivity and structural properties by forming a hybrid with graphite carbon nitride (g-C₃N₄), and can be considered for energy conversion and storage technologies as an interesting class of functional materials and precursors of inorganic materials. In this work, nano-hybrids based on ZIF-67 with sulfur-doped carbon nitride were fabricated. g-C₃N₄ was first synthesized by pyrolyzing urea, then g-C₃N₄/ZIF-67 was formed by hydrothermal technique, and finally it was modified with thioacetamide (TAA) to transform into S-g-C₃N₄/ZIF-67 catalytic material with higher electrochemical active surface area. The mass ratio of ZIF-67 to g-C₃N₄ and g-C₃N₄/ZIF-67 to TAA as well as hydrothermal temperature were investigated by linear sweep voltammetry in order to screen the optimal composite material for oxygen evolution reaction (OER). When the doping amount of g-C₃N₄ in ZIF-67 was 50 mg (the mass ratio of Co(NO₃)₂⸱6H₂O to g-C₃N₄ was 25:1), that of TAA was 20 mg (the mass ratio of g- C₃N₄/ZIF-67 to TAA was 3:2), and the hydrothermal reaction was at 150 °C for 2 h, the prepared composite exhibited the lowest overpotential (289 mV). I-t test and cyclic voltammetry cycle also proved that S-g-C₃N₄/ZIF-67 (150 °C) has relatively good stability. Therefore, sulfur-doped carbon nitride supported ZIF-67 composite can expose more active sites, improve the conduction efficiency and ion transport capacity, and accelerate the process of OER kinetics, which provides a new way for the preparation of ZIF-67 derivatives for OER catalysts.

{"title":"ZIF-67anchored on sulfur-doped carbon nitride as oxygen evolution electrocatalysts","authors":"Qinghui Zhang , Bingyu Chen , Bo Yuan , Linghui Cao , Yongheng Huo , Aijuan Xie , Shiping Luo","doi":"10.1016/j.diamond.2025.112193","DOIUrl":"10.1016/j.diamond.2025.112193","url":null,"abstract":"<div><div>MOF materials can change their electrical conductivity and structural properties by forming a hybrid with graphite carbon nitride (g-C<sub>3</sub>N<sub>4</sub>), and can be considered for energy conversion and storage technologies as an interesting class of functional materials and precursors of inorganic materials. In this work, nano-hybrids based on ZIF-67 with sulfur-doped carbon nitride were fabricated. g-C<sub>3</sub>N<sub>4</sub> was first synthesized by pyrolyzing urea, then g-C<sub>3</sub>N<sub>4</sub>/ZIF-67 was formed by hydrothermal technique, and finally it was modified with thioacetamide (TAA) to transform into S-g-C<sub>3</sub>N<sub>4</sub>/ZIF-67 catalytic material with higher electrochemical active surface area. The mass ratio of ZIF-67 to g-C<sub>3</sub>N<sub>4</sub> and g-C<sub>3</sub>N<sub>4</sub>/ZIF-67 to TAA as well as hydrothermal temperature were investigated by linear sweep voltammetry in order to screen the optimal composite material for oxygen evolution reaction (OER). When the doping amount of g-C<sub>3</sub>N<sub>4</sub> in ZIF-67 was 50 mg (the mass ratio of Co(NO<sub>3</sub>)<sub>2</sub>⸱6H<sub>2</sub>O to g-C<sub>3</sub>N<sub>4</sub> was 25:1), that of TAA was 20 mg (the mass ratio of g- C<sub>3</sub>N<sub>4</sub>/ZIF-67 to TAA was 3:2), and the hydrothermal reaction was at 150 °C for 2 h, the prepared composite exhibited the lowest overpotential (289 mV). I-t test and cyclic voltammetry cycle also proved that S-g-C<sub>3</sub>N<sub>4</sub>/ZIF-67 (150 °C) has relatively good stability. Therefore, sulfur-doped carbon nitride supported ZIF-67 composite can expose more active sites, improve the conduction efficiency and ion transport capacity, and accelerate the process of OER kinetics, which provides a new way for the preparation of ZIF-67 derivatives for OER catalysts.</div></div>","PeriodicalId":11266,"journal":{"name":"Diamond and Related Materials","volume":"154 ","pages":"Article 112193"},"PeriodicalIF":4.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143628175","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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