Journal of Physics and Chemistry of Solids最新文献

{"title":"Formation of intermetallic phases and texture evolution in Ni0.95Mo0.05/Ti multilayer","authors":"A.S. Konashuk ,&nbsp;E.O. Filatova ,&nbsp;A.U. Gaisin ,&nbsp;A.V. Karataev ,&nbsp;D.V. Danilov ,&nbsp;V.A. Matveev ,&nbsp;S.S. Sakhonenkov","doi":"10.1016/j.jpcs.2025.112927","DOIUrl":"10.1016/j.jpcs.2025.112927","url":null,"abstract":"<div><div>This study presents a comprehensive investigation of the chemical and structural properties, particularly the texture, of glass/[Ni₀_.₉₅Mo₀_.₀₅/Ti]_N multilayer systems with period thicknesses ranging from 4 to 20 nm. A combination of X-ray diffraction (XRD), X-ray reflectometry (XRR), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and X-ray photoelectron spectroscopy (XPS) was employed for the analysis. A gradual change in the preferred orientation of hexagonal α-Ti crystallites from (002) to (100) with increasing period thickness was revealed, which potentially explains the growth of layer waviness from the substrate to the surface with increase of period thickness. Crystallization of Ni₀_.₉₅Mo_0.05 in the form of solid solution was established. The formation of Ni_1-xTi_x intermetallic compounds at the interfaces was shown, with an average stoichiometry of x ≈ 0.5. These presumably comprise a mixture of Ni-rich and Ti-rich intermetallics. As the period thickness increases, crystallization of the intermetallics in the form of mixture of Ni₃Ti and Ti₂Ni as well as refinement (fragmentation) of the grains of the intermetallic compounds was revealed. The results obtained provide insights into the problem of creating sharp interfaces in multilayered systems, which is essential for the development of high-efficient reflective elements for neutron optics as well as for X-ray microscopy in the spectral range of the “water window\".</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112927"},"PeriodicalIF":4.3,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270048","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}

{"title":"Synthesis and trigonal structure of a new lead-free zero-dimensional perovskite (CH3NH3)2[SnBr6] with multifunctional optical and electrical properties","authors":"Imen Ibrahmi ,&nbsp;Imen Gharbi ,&nbsp;Iheb Garoui ,&nbsp;Sandy Auguste ,&nbsp;Walid Rekik ,&nbsp;Jean-François Bardeau ,&nbsp;Gwenaël Corbel ,&nbsp;Abderrazek Oueslati","doi":"10.1016/j.jpcs.2025.112909","DOIUrl":"10.1016/j.jpcs.2025.112909","url":null,"abstract":"<div><div>Tin-halide perovskites have recently gained attention as a promising alternative to lead-halide perovskites for optoelectronic and photovoltaic applications. This study focuses on synthesizing and characterizing the zero-dimensional perovskite-type halide (CH₃NH₃)₂[SnBr₆]. The compound was successfully synthesized through the slow evaporation technique at ambient temperature. The crystal structure was determined using diffraction data from a single crystal, confirming that the compound crystallizes in the R-3m trigonal space group. Furthermore, X-ray diffraction analysis of the powdered sample, obtained by grinding multiple crystals, demonstrated that all crystals share an identical chemical composition. Raman spectroscopy provided comprehensive insights into the vibrational properties of the material. Optical absorption analysis revealed a direct band gap of approximately 3.21 eV, indicating the semiconductor nature of the material. The complex impedance spectroscopy (CIS) method is employed to investigate the material's electrical and dielectric behaviors, with an emphasis on carrier dynamics, grain boundaries influence, dielectric relaxation (localized relaxation), and long-range conduction (non-localized relaxation). Analyzing the complex impedance and electric modulus allows identifying the grain boundary's contribution to the material's conductive and dielectric properties, revealing a non-Debye relaxation behavior. The compound demonstrates low dielectric loss and a high permittivity value (<em>ε</em> ∼ 10³). By addressing the scientific challenge of improving material performance for microelectronics, this research advances the field and paves the way for further exploration and application of organic-inorganic hybrid materials.</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112909"},"PeriodicalIF":4.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144281017","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}

{"title":"2D hafnium halides and hetero halides: Bridging topological properties and quantum capacitance","authors":"Jigneshkumar B. Barot ,&nbsp;Himalay Kolavada ,&nbsp;Sanjeev K. Gupta ,&nbsp;P. N. Gajjar","doi":"10.1016/j.jpcs.2025.112928","DOIUrl":"10.1016/j.jpcs.2025.112928","url":null,"abstract":"<div><div>Two-dimensional (2D) topological insulators (TIs) have become an intriguing family of materials due to their potential applications in spintronics, quantum computing, and nanoelectronics, as well as their resilient edge states shielded by time-reversal symmetry. The structural, electronic, optical and topological characteristics of hafnium halides and their hetero halides (<span><math><mrow><msub><mtext>Hf</mtext><mn>2</mn></msub><msub><mi>X</mi><mn>2</mn></msub></mrow></math></span>, where X = one or two halogen from Cl, Br and I) are examined in this work. We verify their non-trivial topological character by analyzing their stability, band structures, and topological invariants using first-principles density functional theory (DFT) computations. Our findings show that halide composition and spin-orbit coupling (SOC) have a major impact on band inversion. The topological insulator nature is confirmed by the presence of gapless edge states and the computed z2 invariant. Optical properties of these materials, such as their absorption spectra and dielectric function, demonstrate their potential for use in optoelectronics. Additionally, calculations of quantum capacitance show that it has a large capacity for storing charge. This thorough investigation of hafnium halides and hafnium hetero halides identifies them as viable options for 2D TIs with a variety of applications in optoelectronics and energy storage.</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112928"},"PeriodicalIF":4.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254081","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}

{"title":"Improved electrochemical performance of tri metallic-organic framework decorated with graphene oxide sheets for high-performance energy storage applications","authors":"Mariam Liaquat,&nbsp;Qura Tul Ain,&nbsp;Hina Zohra,&nbsp;Ayesha Maqbool,&nbsp;Kainat Jaffar","doi":"10.1016/j.jpcs.2025.112925","DOIUrl":"10.1016/j.jpcs.2025.112925","url":null,"abstract":"<div><div>The recent progress in development of metal-organic frameworks (MOFs) have gathered significant interest for their application in the invention of supercapacitors owing to their large surface area and substantial absorbency. Though, inadequate ability to conduct electricity as well as suboptimal mechanical features of the MOFs constrained its applicability within the field. Therefore, tri-metallic MOF with graphene oxide (Ni-Mg-Mo-MOF@GO nanocomposite) was synthesized to improve the weak characteristics of MOF. The CV measurement revealed a specific capacitance of 14125 F/g in a system consisting of three electrodes with an electrolyte of 1 M KOH at a scan rate of 10 mV/s when the Ni-Mg-Mo-MOF@GO nanocomposite was utilised as the conducting electrode component for a supercapacitor. Ni-Mg-Mo-MOF@GO/carbon active/accumulated in 1 M KOH electrolyte solution inside a potential window range of 0.75V demonstrate excellent energy storage ability due to the synergistic interaction between graphene oxide. In GCD analysis Ni-Mg-Mo-MOF@GO had the largest specific capacitance with a power density of 561Wkg^–1 and a current density of 1.33Ag^–1. This study confirms that Ni-Mg-Mo-MOF@GO increases both capacitive and diffusive controlled current contribution process respectively. Electrochemical outcomes demonstrate that this nanocomposite's enhance super-capacitive performance. Consequently, for high energy storage applications, this nanocomposite may be an ideal electrode material.</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112925"},"PeriodicalIF":4.3,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144290818","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}

{"title":"From UV to IR: Unveiling the photocatalytic and optoelectronic promise of Cs2ReX (X= Cl, Br, I) compounds","authors":"Mohamed El Amine El Goutni ,&nbsp;Hela Ferjani ,&nbsp;Mohammed Batouche ,&nbsp;Taib Seddik","doi":"10.1016/j.jpcs.2025.112923","DOIUrl":"10.1016/j.jpcs.2025.112923","url":null,"abstract":"<div><div>In this study, the structural, electronic, optical, and magnetic properties of vacancy-ordered double perovskites Cs₂ReX₆ (X = Cl, Br, I) are investigated using density functional theory (DFT). GGA + mBJ calculations yield band gaps of 2.68 eV (Cl), 2.19 eV (Br), and 1.40 eV (I). The valence band maximum (VBM) potentials decrease from +2.54 V to +1.88 V and +1.11 V versus the normal hydrogen electrode (NHE), while the conduction band minimum (CBM) values are −0.14 V, −0.31 V, and −0.29 V, respectively. These trends are influenced by increasing halogen ionic radius and decreasing electronegativity. Mechanical stability is confirmed through elastic constants, and all compounds show ductile behavior. Cs₂ReI₆ exhibits enhanced infrared absorption and the highest dielectric constant (<em>ε</em>₁(∞) = 7.62), indicating strong optical response in the IR region. Magnetic calculations reveal a ferromagnetic ground state for all compounds, with total magnetic moments close to 3 μB, mainly contributed by Re 5d electrons. The combination of favorable band edge positions, stable ferromagnetism, and strong light absorption suggests that Cs₂ReX₆ materials are promising candidates for photocatalysis, optoelectronics, and spintronic devices.</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112923"},"PeriodicalIF":4.3,"publicationDate":"2025-06-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255073","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}

{"title":"Understanding the interface-driven thermoelectric behaviour of Bi2Te3–Ga2Te3 alloys","authors":"Varinder Pal ,&nbsp;P.R. Sreeram ,&nbsp;Surafel Shiferaw Legese ,&nbsp;Priyam Srivastava ,&nbsp;Rani Rohini ,&nbsp;Kamanio Chattopadhyay ,&nbsp;Manas Paliwal ,&nbsp;Chandra Sekhar Tiwary","doi":"10.1016/j.jpcs.2025.112904","DOIUrl":"10.1016/j.jpcs.2025.112904","url":null,"abstract":"<div><div>Thermoelectricity is one of the interesting solid-state energy conversion techniques for waste heat recovery. Bi₂Te₃ is a widely used thermoelectric material with a narrow bandgap and rhombohedral crystal structure. On the other hand, Ga₂Te₃ is another interesting phase with a wider bandgap and zinc-blend crystal structure that shows ultra-low thermal conductivity. In the present investigation, the multiphase alloys with varying fractions of these phases have been prepared to explore the possible energy filtering effect. Among the investigated alloys, an interesting high electrical conductivity and Seebeck coefficient was observed for the eutectic alloy, resulting in a thermoelectric Figure of merit (<em>zT</em>) of 0.54. On the other hand, a significant reduction of about 16 percent in total thermal conductivity at room temperature is observed due to the increased interfaces and Ga₂Te₃ phase. Moreover, the role of the interface in deciding the electronic transport is explained using the possible heterojunction between the Bi₂Te₃ and Ga₂Te₃ phases. This study examines the role of phase equilibria and interface engineering in designing new eutectics with improved thermoelectric performance.</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112904"},"PeriodicalIF":4.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144255075","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}

{"title":"Development and enhancement of charge separation processes for the degradation of RhB using an innovative ZnO/MgIn2S4 S-scheme heterojunction photocatalyst","authors":"Chunying Wu ,&nbsp;Zeyi Liu ,&nbsp;Jianyong Zhang","doi":"10.1016/j.jpcs.2025.112901","DOIUrl":"10.1016/j.jpcs.2025.112901","url":null,"abstract":"<div><div>The dye Rhodamine B (RhB), commonly utilized in the textile sector, is linked to carcinogenic and neurotoxic effects, posing a significant risk for a range of human health issues. Photocatalytic systems can be used as an effective and energy-saving technique to degrade dye pollutants. Herein, a novel ZnO/MgIn₂S₄ S-scheme heterojunction photocatalyst was successfully synthesized by a facile method and employed as a highly efficient photocatalyst for the degradation of RhB under visible light irradiation. To optimize the use of the developed photocatalyst for environmental remediation, it was investigated how several factors affect the photocatalytic process. These factors included the initial pH of the reaction medium, the photocatalyst dosage, and RhB concentration. The reaction kinetics of the synthesized photocatalysts followed pseudo-first-order kinetics, and the degradation rate constant was obtained at 1874 × 10⁻⁴ min⁻¹ for the optimized ZnO/MgIn₂S₄ nanocomposite, which was significantly increased compared to the constituent components. Examination of the optical properties demonstrated that the presence of MgIn₂S₄ with a narrow band gap increased the absorption of visible light in the nanocomposite compared to the bare ZnO. Also, photocurrent and electrochemical impedance studies displayed that, the incorporation of MgIn₂S₄ and ZnO facilitated charge separation by controlling the band structure in the constructed heterojunction. The trapping tests identified holes, hydroxyl and superoxide ion radicals as the dominant active species for photodegradation. In addition, the prepared ZnO/MgIn₂S₄ photocatalyst showed significant stability after 4 cycles of the photocatalytic degradation process. Finally, the most probable charge transfer mechanism was proposed by analyzing the experimental results.</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112901"},"PeriodicalIF":4.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144491397","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}

{"title":"Tunable ohmic contacts in two-dimensional ZnO monolayer via surface-engineered metallic Pd substrates: A first principles study","authors":"Lanli Chen ,&nbsp;Zhihua Xiong ,&nbsp;Hongduo Hu ,&nbsp;Haiqing Han ,&nbsp;Yuanyuan Cui","doi":"10.1016/j.jpcs.2025.112921","DOIUrl":"10.1016/j.jpcs.2025.112921","url":null,"abstract":"<div><div>Achieving reliable ohmic contacts at metal-semiconductor interfaces is crucial for reducing carrier injection barriers and optimizing device performance. However, creating a low Schottky barrier at the metal/ZnO interface remains challenging. Herein, we present a comprehensive investigation into monolayer ZnO contacted by surface-engineered-Pd substrate with <em>X</em>-modification (<em>X</em> = N, H, O) via first-principles calculations based on the DFT + <em>U</em> method. The results show that the contact types and Schottky barrier heights (SBH) of Pd/ZnO heterojunctions can be effectively tuned by <em>X</em>-modification. The Pd–ZnO heterojunction forms an <em>n</em>-type Schottky contact with the SBH of 0.675 eV. The Pd–H–ZnO heterojunction yields a <em>p</em>-type Schottky contact with the SBH of 0.571 eV. Notably, the Pd–N–ZnO heterojunction transitions from an <em>n</em>-type to a quasi-ohmic with an ultra-low SBH of 0.068 eV, suggesting its potential for energy-efficient transistor device. In contrast, the Pd–O–ZnO heterojunction forms a <em>p</em>-type ohmic contact with the SBH of −0.159 eV, attributed to significant work function variation and structural distortion. The SBH in the Pd–O–ZnO heterostructure can be modulated by adjusting oxygen coverage, enabling a transition from a <em>p</em>-type Schottky contact to a <em>p</em>-type ohmic contact. Additionally, the contact type of the Pd–O–ZnO heterostructure can be fine-tuned by applying strain, shifting from a <em>p</em>-type ohmic contact to a quasi-ohmic contact when strain exceeds 4 %, The ability to achieve both <em>p</em>-type and <em>n</em>-type ohmic contacts suggests that surface-engineered Pd substrates on two-dimensional ZnO-based materials may have potential applications in complementary metal-oxide-semiconductor (CMOS) devices.</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112921"},"PeriodicalIF":4.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242635","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}

{"title":"Unraveling the electronic, vibrational, thermodynamic, optical and piezoelectric properties of LiNbO3, LiTaO3 and Li2NbTaO6 from first-principles calculations","authors":"Debidutta Pradhan,&nbsp;Rojalin Swain,&nbsp;Souvagya Kumar Biswal,&nbsp;Jagadish Kumar","doi":"10.1016/j.jpcs.2025.112879","DOIUrl":"10.1016/j.jpcs.2025.112879","url":null,"abstract":"<div><div>The piezoelectric and optical properties are pivotal in advancing modern microelectronics and smart device technologies. In this context, LiNbO<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> and LiTaO<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> emerge as promising functional perovskites, exhibiting appreciable ferroelectric and nonlinear optical properties with a broad range of applications. In this study, we have investigated electronic, vibrational, optical, thermal and piezoelectric properties of LiNbO<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span>, LiTaO<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> and Li<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span>NbTaO<span><math><msub><mrow></mrow><mrow><mn>6</mn></mrow></msub></math></span> using first-principles calculations based on density functional theory. We have checked the structural stability by calculating the tolerance factor and formation energy before proceeding to further calculations. The ground state electronic band structures and corresponding density of states establish their semiconducting nature with a wide band gap range of 3.5–3.7 eV. Optical properties, including the dielectric function, absorption coefficient, optical conductivity, refractive index, absorbance, and reflectance, were simulated using time-dependent perturbation theory. Furthermore, the piezoelectric properties and Born effective charges were systematically investigated to elucidate the underlying correlation between covalency and induced polarization. In these materials, the distortion affected by the small ionic radius of Li<span><math><msup><mrow></mrow><mrow><mo>+</mo></mrow></msup></math></span>, coupled with the strong covalent interaction between transition metal elements and oxygen, leads to high spontaneous polarization, enhancing their piezoelectric and optical properties.</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112879"},"PeriodicalIF":4.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242630","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}

{"title":"Sphere-like Co-doped Ni metal-organic framework for enhanced oxygen evolution reaction","authors":"Mani Sivakumar ,&nbsp;Veeramani Vediyappan ,&nbsp;Manivannan Bhuvaneshwari ,&nbsp;Balamurugan Muthukutty ,&nbsp;Ponnaiah Sathish Kumar ,&nbsp;Seong-Cheol Kim ,&nbsp;Krishnapandi Alagumalai ,&nbsp;Gabriela Sandoval-Hevia","doi":"10.1016/j.jpcs.2025.112918","DOIUrl":"10.1016/j.jpcs.2025.112918","url":null,"abstract":"<div><div>In recent years, economically viable multifunctional materials with large surface areas and exposed active metal sites, based on bimetallic metal-organic frameworks (MOFs), have emerged as excellent candidates for oxygen evolution reaction (OER). In this study, we synthesized sphere-like Co@Ni-MOF-X and Ni-MOF samples via a hydrothermal approach using 1,4-dicarboxylic acid as the organic source. Surface morphology and XRD patterns of the sphere-like Co@Ni-MOF-X and Ni-MOF samples were examined to confirm their crystallographic structure, phase purity, and morphology of as synthesized MOFs. Subsequently, modified electrodes using the sphere-like Co@Ni-MOF-X and Ni-MOF samples were subjected to electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV) to assess their charge transfer resistance (R_ct) and OER performance in alkaline media. The Co@Ni-MOF-2 (317 mV) and Co@Ni-MOF-3 (293 mV) samples exhibited promising OER performance at a scan rate of 10 mV s⁻¹. Additionally, the Co@Ni-MOF-2 and Co@Ni-MOF-3 samples showed Tafel plot values of 140 and 168 mV dec⁻¹, respectively. Furthermore, Co@Ni-MOF-2 demonstrated good stability performance.</div></div>","PeriodicalId":16811,"journal":{"name":"Journal of Physics and Chemistry of Solids","volume":"207 ","pages":"Article 112918"},"PeriodicalIF":4.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144242649","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}