Journal of Solid State Chemistry最新文献

{"title":"Phase transformation of BaAl2Si2O8 through metastable phase-growth in a kaolinite system containing minor impurities","authors":"Shingo Machida ,&nbsp;Hajime Okawa ,&nbsp;Toshimichi Shibue","doi":"10.1016/j.jssc.2026.125888","DOIUrl":"10.1016/j.jssc.2026.125888","url":null,"abstract":"<div><div>Hexacelsian, the metastable phase of BaAl₂Si₂O₈, is composed of stacked tetrahedral aluminosilicate layers; however, practical utilization of this layered structure is hindered by impurity-driven transformation to celsian, the stable phase of BaAl₂Si₂O₈ with a three-dimensional framework crystal structure. In this study, the hexacelsian-to-celsian transformation prepared from kaolinite containing relatively small amounts of by-products was examined by varying a pre-heating step to grow the hexacelsian phase prior to calcination at 1600 °C as the main heating step. X-ray diffraction patterns and solid-state ²⁷Al nuclear magnetic resonance spectra revealed the formation of poorly crystalline and then crystalline hexacelsian, accompanied by small amounts of BaAl₂O₄ and Ba₂SiO₄ originating from the by-products. Although defect signals were not detected by electron spin resonance, the presence of BaAl₂O₄ and Ba₂SiO₄, together with the sharpening and intensity changes of the ²⁷Al signals, were used as qualitative indicators of defect-related factors, which correlate with an accelerated transformation to celsian. Comparisons among specimens with nearly constant crystallinity and surface area confirm this correlation. Comparisons at nearly constant surface area show that increased crystallinity retards the transformation, whereas comparisons at similar crystallinity indicate that surface area still influences the transformation. Therefore, the results indicate that defect-related factors, crystallinity, and surface area dominate the transformation from hexacelsian to celsian, and their individual influences can be qualitatively distinguished through the present comparisons. Thus, this study provides practical guidelines for stabilizing hexacelsian in impurity-bearing raw materials and for exploiting metastable layered aluminosilicates in high-temperature ceramic applications.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"358 ","pages":"Article 125888"},"PeriodicalIF":3.5,"publicationDate":"2026-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146161706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Three multifunctional coordination polymers based on viologen: photochromic/thermochromic properties, ammonia vapor sensing and applications","authors":"Boyu Shan ,&nbsp;Shuqi Zhang ,&nbsp;Qi Shi ,&nbsp;Yuchen Wang ,&nbsp;Yan Chen ,&nbsp;Jinghan Zhang ,&nbsp;Xin Shi ,&nbsp;Yang Zhao ,&nbsp;Xinzhu Li ,&nbsp;Baili Zhu ,&nbsp;Changbin Shao ,&nbsp;Shuxin Cui","doi":"10.1016/j.jssc.2026.125879","DOIUrl":"10.1016/j.jssc.2026.125879","url":null,"abstract":"<div><div>Multifunctional coordination polymers (CPs) with stimulus responses containing viologen have been widely studied and prepared. In this work, based on a novel viologen ligand {H₂BCMBPY·2Cl = 1,1′-bis [(2-carboxybipheny-4-yl)methyl]-4,4′- bipyridinium dichloride}, 1,2,4,5-benzenetetracarboxylic acid (H₄BTEC) and CdCl₂·2.5H₂O/ZnSO₄·7H₂O, three multifunctional CPs were synthesized under solvothermal conditions, named {[Cd₄(BCMBPY)₂(BTEC)₂]·4H₂O}_n (<strong>1</strong>), {[Zn₂·2(BCMBPY)_1/2·2(BTEC)_1/2]·2H₂O}_n (<strong>2a</strong>), {[Zn₂(BCMBPY)(BTEC)]·2H₂O}_n (<strong>2b</strong>). Under irradiation with a Xe lamp, three CPs exhibited distinct color changes: CP <strong>1</strong> turned yellow-green, while <strong>2a</strong> and <strong>2b</strong> turned blue. Notably, <strong>2b</strong> showed high photosensitivity displaying photochromic behavior within 2 s. The discoloration mechanism of three CPs were investigated via time-dependent density functional theory (TDDFT). All three CPs also undergo visible color changes under thermal treatment or ammonia vapor conditions. Furthermore, in studies on inkless erasable printing, QR code anti-counterfeiting and photochromic films, all three CPs demonstrated excellent performance, making them promising candidates for multifunctional stimulus-responsive materials. It was found that the structure and properties of CPs can be tuned by changing the metal center or solvent.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"357 ","pages":"Article 125879"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185597","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"One-step self-assembly synthesis strategy for hierarchical MoO3/NiMoO4 nanorods: Bifunctional lithium-ion batteries and forensic applications","authors":"K.R. Pooja ,&nbsp;Manjanna J ,&nbsp;C.V. Manjunatha ,&nbsp;Y. Venkataramanappa ,&nbsp;G. Nagaraju","doi":"10.1016/j.jssc.2026.125887","DOIUrl":"10.1016/j.jssc.2026.125887","url":null,"abstract":"<div><div>Hierarchical MoO₃/NiMoO₄ NCs were successfully synthesized via a simple one-step self-assembly hydrothermal method using flaxseed oil as a green fuel and structure-directing agent. Structural characterization confirmed the coexistence of orthorhombic MoO₃ and monoclinic NiMoO₄ phases with strong interfacial coupling, enabling rapid electron transport and enhanced Li⁺ diffusion. When evaluated as an anode material for lithium-ion batteries, the MoO₃/NiMoO₄ electrode delivered an impressive initial discharge capacity of 1450 mAhg⁻¹ at 0.2C, outstanding rate capability (2215 mAhg⁻¹ at 0.1C), and excellent cycling stability with 933 mAhg⁻¹ retained after 500 cycles. These superior electrochemical performances are attributed to the synergistic redox activity, the hierarchical porous nanorod architecture, which effectively accommodates volume variations, and accelerated charge transfer across the heterointerface. Electrochemical impedance spectroscopy further revealed low charge-transfer resistance and improved Li⁺ diffusion kinetics, confirming enhanced interfacial conductivity. Beyond its exceptional energy storage behavior, the material exhibited strong blue-green photoluminescence at 361 nm, which was successfully utilized for latent fingerprint visualization, demonstrating its multifunctional potential. Overall, the MoO₃/NiMoO₄ NCs provide a robust and sustainable platform for next-generation high-performance lithium-ion battery applications.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"357 ","pages":"Article 125887"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A dual-functional hafnium-amino UiO-66 MOF: Synergistic electrostatic enrichment and in-situ reduction for efficient Cr(VI) detoxification","authors":"Xiaoyi Lin ,&nbsp;Sabrina Yanan Jiang ,&nbsp;Gang Li","doi":"10.1016/j.jssc.2026.125835","DOIUrl":"10.1016/j.jssc.2026.125835","url":null,"abstract":"<div><div>Based on HfCl₄ and 2-amino-terephthalic acid (NH₂–H₂BDC), a hafnium-based metal–organic framework (Hf-UiO-66-NH₂) was solvothermally synthesized in a DMF–H₂O system modulated with acetic acid. The material exhibits excellent performance in removing Cr(VI) from aqueous solution, with a maximum adsorption capacity of 77 mg g⁻¹ and a removal efficiency of 87.72 % in a single-phase system. The Cr(VI) uptake mechanism involves a synergistic process of electrostatic attraction, reduction, and coordination: under acidic conditions, protonated amino groups (–NH₃⁺) attract chromate anions, followed by in situ reduction of Cr(VI) to less toxic Cr(III) by electron-donating moieties (e.g., –OH) within the framework. The resulting Cr(III) species are subsequently immobilized via coordination to amino or other functional groups. This proposed mechanism is consistently supported by X-ray photoelectron spectroscopy (XPS) and Fourier-transform infrared spectroscopy (FTIR) analyses.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"357 ","pages":"Article 125835"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146015879","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interface engineering coupled with NiAl-LDH/Ti3C2Tx sacrificial template: Fabrication of 3D flower-like NiO/Al2O3/TiO2 composites and their DMF gas-sensing performances","authors":"Caihong Yuan,&nbsp;Keyue Gong,&nbsp;Xintong Dong,&nbsp;Ying Guo","doi":"10.1016/j.jssc.2026.125856","DOIUrl":"10.1016/j.jssc.2026.125856","url":null,"abstract":"<div><div>This paper reports the synthesis of a three-dimensional (3D) flower-like NiO/Al₂O₃/TiO₂ composite for N,N-dimethylformamide (DMF) vapor detection, by calcination of the self-sacrificing NiAl-LDH/Ti₃C₂T_x precursor, which is fabricated via hydrothermal synthesis with monolayer Ti₃C₂T_x MXene as the substrate for LDH growth. Noteworthily, the interface engineering of monolayer Ti₃C₂T_x into the LDH precursor endows the calcined composite oxides with uniform elemental distribution while effectively suppressing nanoparticle aggregation. Further optimization of Ti₃C₂T_x content enables precise control over TiO₂ amount, which not only modulates the morphology of the NiO/Al₂O₃ composite but also tailors its electronic structure. The optimized NiO/Al₂O₃/TiO₂ composite exhibits prominent advantages, including abundant oxygen vacancies, a high specific surface area of 175 m² g⁻¹, and a narrowed band gap. Experimental results demonstrate that the sensitivity of NiO/Al₂O₃/TiO₂ to 100 ppm N, N-dimethylformamide at 245 °C reaches 48.6, which is approximately 3 times as high as that of pure NiO/Al₂O₃. Compared with traditional preparation methods, the as-synthesized composite metal oxide exhibits superior gas-sensing performance. This study provides a new design concept for developing high-performance composite metal oxide gas-sensing materials via precursor interface engineering.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"357 ","pages":"Article 125856"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146075880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis, crystal structure and high-temperature investigation of new Dion-Jacobson type titanoniobates","authors":"O.V. Krasheninnikova,&nbsp;M.S. Lomakin,&nbsp;I.S. Sorokin,&nbsp;E.V. Suleimanov,&nbsp;V.A. Oloventsova,&nbsp;D.N. Titaev","doi":"10.1016/j.jssc.2026.125846","DOIUrl":"10.1016/j.jssc.2026.125846","url":null,"abstract":"<div><div>New Dion–Jacobson type layered titanoniobates RbEu₂Ti₂NbO₁₀, RbSm₂Ti₂NbO₁₀ and their proton-exchanged analogues HEu₂Ti₂NbO₁₀·0.68H₂O and HSm₂Ti₂NbO₁₀·0.73H₂O were synthesized for the first time. Rb-containing phases were obtained by high-temperature solid-state reactions, while protonated derivatives were produced through ion exchange in hydrochloric acid solution. Phase and chemical purity were verified by XRD, EDX and TGA. The crystal structures of RbEu₂Ti₂NbO₁₀ and RbSm₂Ti₂NbO₁₀ were refined in the tetragonal P4/mmm space group, confirming the characteristic Dion–Jacobson arrangement with strong Ti/Nb B-site ordering. Polyhedral analysis revealed that decreasing lanthanide ionic radius leads to enhanced distortions of the [LnO₁₂] and outer [(Ti/Nb)O₆] octahedra, while the central [TiO₆] units remain nearly undistorted. Thermal behavior was examined using DTA/TGA and high-temperature XRD. Rb-containing phases are stable up to 1273 K, whereas protonated forms are metastable and undergo sequential dehydration and deprotonation accompanied by partial collapse of the layered framework. Optical diffuse-reflectance spectroscopy showed direct band gaps of 3.41–3.62 eV. Band-edge potentials indicate that all compounds are active under UV irradiation and are capable of generating superoxide radicals, suggesting their suitability for photocatalytic oxidation processes.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"357 ","pages":"Article 125846"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Controlled synthesis of close-packed ternary sulfides heterojunction based on ZIF-8@In-TCPP and enhanced photocatalytic hydrogen evolution","authors":"Fuyuan Yang,&nbsp;Zhongqiao Sun,&nbsp;Hao Meng,&nbsp;Yide Han,&nbsp;Wenhao Li,&nbsp;Xia Zhang","doi":"10.1016/j.jssc.2026.125857","DOIUrl":"10.1016/j.jssc.2026.125857","url":null,"abstract":"<div><div>Metal organic frameworks (MOFs), being as a sacrificial precursor were used to synthesize composite semiconductors, that is found with the superiorities in designing the special architecture, including high-disperse metal nodes, hierarchical porous structure and close-packed heterojunction. In this study, lamellar In-TCPP was employed to incorporate ZIF-8 to fabricate a MOF@MOF architecture (ZIF-8@In-TCPP), which was then subjected to a thioacetamide (TAA)-assisted sulfidation process, yielding a ternary sulfide composed of ZnS, ZnIn₂S₄ (ZIS), and In₂S₃, denoted as Z@In-<em>t</em> (where <em>t</em> represents the controlled sulfidation duration). The sulfidation time was varied from 6 h to 36 h to optimize the final hetero structure and the photocatalytic activity of Z@In-<em>t</em>. Compared to original ZIF-8@In-TCPP, the bandgap of Z@In-12 is narrowed till 2.34 eV, showing hierarchically porous nanosheet structure with tightly interconnected interface junction. Irradiated with visible light (λ ≥ 420 nm), the Z@In-12 demonstrates the best photocatalytic hydrogen evolution rate of 4449.79 μmol g⁻¹ h⁻¹, while no precious metal co-catalysts were added. This photocatalytic rate markedly exceeds the values by the single In-TCPP and binary ZIF-8@In-TCPP, and also surpasses most of previously reported values by MOF-derived sulfides. The electrochemical analyses, including transient photocurrent-time (<em>I</em>-<em>t</em>) curves, electrochemical impedance spectroscopy (EIS), and electron paramagnetic resonance (EPR) spectroscopy were used to clarify the enhance photocatalytic mechanism. This work enriches the researches related to MOF-derived multiple sulfides, and designing the MOFs precursors in the improved visible light photocatalytic hydrogen production.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"357 ","pages":"Article 125857"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Millimeter-sized Ba5Nb4O15 single crystals: Growth, structural characterization, and specific heat","authors":"Yao Zhou ,&nbsp;Xin Zhang ,&nbsp;Wenjun Chu ,&nbsp;Xinyu Yin ,&nbsp;Lulu Tang ,&nbsp;Han-Shu Xu","doi":"10.1016/j.jssc.2026.125880","DOIUrl":"10.1016/j.jssc.2026.125880","url":null,"abstract":"<div><div>We report the growth of high-quality, millimeter-sized Ba₅Nb₄O₁₅ single crystals using a flux method, with the largest crystals reaching dimensions of 3 × 1.5 × 0.3 mm³. X-ray diffraction (XRD) analyses confirms that Ba₅Nb₄O₁₅ crystallizes in the hexagonal perovskite-related structure with space group <span><math><mrow><mi>P</mi><mover><mn>3</mn><mo>‾</mo></mover><mi>m</mi><mn>1</mn></mrow></math></span>, and that the naturally exposed facets correspond to the (00<em>l</em>) plane. Importantly, the temperature-dependent specific heat is well described by the Debye–Einstein phonon model, yielding a Debye temperature (<span><math><mrow><msub><mi>Θ</mi><mi>D</mi></msub></mrow></math></span>) of 165 K and an average phonon velocity (<span><math><mrow><msub><mi>v</mi><mi>p</mi></msub></mrow></math></span>) of 1343.9 m/s. Moreover, no anomaly indicative of a structural phase transition is observed in the entire measurement range of 2–220 K.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"357 ","pages":"Article 125880"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of nickel on structural, thermal and electrical properties bismuth niobate/tantalate pyrochlore","authors":"N.A. Zhuk ,&nbsp;N.A. Sekushin ,&nbsp;M.G. Krzhizhanovskaya ,&nbsp;D.V. Sivkov ,&nbsp;K.A. Badanina","doi":"10.1016/j.jssc.2026.125876","DOIUrl":"10.1016/j.jssc.2026.125876","url":null,"abstract":"<div><div>The crystal structure, thermal and electrical properties of nickel-containing pyrochlore of the Bi₂NiNb₂O₉ composition are studied. The disordered crystalline structure of pyrochlore (sp. gr. Fd-3m, a = 10.53784 Å, Z = 4) is refined by the Rietveld method based on X-ray powder diffraction (XRD) data. In contrast to the loose, porous tantalum pyrochlore (grain size of 0.5-2.0 μm), the microstructure of the niobium ceramics is grainless and low-porous. Niobium pyrochlore has a structure of disordered pyrochlore, in which the bismuth atoms are displaced to the 96g position, and the oxygen atoms are distributed over 48f and 8a with incomplete occupancy. Nickel cations are distributed over the bismuth and niobium positions. The tolerance of the octahedral tantalum sublattice to nickel cations is higher and its capacity with respect to Ni(II) is 5.3% higher than that of the niobium sublattice. At the same time, the vacancy of the bismuth sublattice is 22% compared to 18% for niobium pyrochlore. The thermal expansion of the cell is studied by high-temperature X-ray diffraction in the temperature range of 30-1200 °C. The thermal expansion coefficient (TEC) is higher than for tantalum pyrochlore (from 3.8 × 10⁻⁶ to 7.0 × 10⁻⁶ °C⁻¹ at 30–750 °C), monotonically increases from 5.12 × 10⁻⁶ °С⁻¹ (30°С) to 7.73 × 10⁻⁶ °С⁻¹ (750°С). The mechanism of thermal destruction of pyrochlores Bi₂NiNb₂O₉ and Bi₂NiTa₂O₉ is similar and consists in the formation of isostructural intermediate compounds NiNb₂O₆/NiTa₂O₆ and the proximity of the thermal dissociation temperature of pyrochlores 1110/1080°С, which is associated with volatility and removal of bismuth(III) oxide at high temperature. The dielectric characteristics of niobium pyrochlore are significantly better than for tantalum-containing pyrochlore of similar composition. Bi₂NiNb₂O₉ is characterized by a high activation energy of 1.43 eV; high frequency-independent dielectric permittivity of ∼144 (up to 300°С) and a dielectric loss tangent of ∼0.002 at 1 MHz. Ion transport was not detected. The investigated ceramics can be used in the multilayer ceramic capacitor creation.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"357 ","pages":"Article 125876"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced photocatalytic hydrogen evolution by N atoms doping in pyrene-based one-dimensional covalent organic frameworks (1D-COFs)","authors":"Changyu Qin ,&nbsp;Xuxin Fan ,&nbsp;Yao Yang ,&nbsp;Shuang Zhang ,&nbsp;Yang Xiong ,&nbsp;Xianglin Yu ,&nbsp;Junbo Li","doi":"10.1016/j.jssc.2026.125881","DOIUrl":"10.1016/j.jssc.2026.125881","url":null,"abstract":"<div><div>Photocatalytic hydrogen production relies on efficient photocatalysts. Nowadays, metal-free catalysts have become a research hotspot, especially covalent organic frameworks (COFs) based catalysts. The introduction of nitrogen atoms into COFs could alter the electronic structure, increase catalytic sites, and enhance photocatalytic performance. In this work, nitrogen atoms were introduced into pyrene-based 1D-COF, the as-prepared 1N–COF exhibits optimal photocatalytic hydrogen production performance of 10.57 mmol g⁻¹ h⁻¹. Photoelectrical property tests verified that the 1N–COF has good charge transfer ability and slower electron-hole recombination rate compared with 0N–COF. Additionally, DFT calculations revealed that the introduction of nitrogen atoms increased catalytic sites and reduced H adsorption free energy.</div></div>","PeriodicalId":378,"journal":{"name":"Journal of Solid State Chemistry","volume":"357 ","pages":"Article 125881"},"PeriodicalIF":3.5,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146185668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}