Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
siqing Wang,Yan Zhang,Pengda Xiang,Dawei Chen,Qiling Li,Zhiyan Guo,chen chen
Electrocatalytic urea synthesis from CO2 and NOx offers a sustainable route for chemical production and environmental remediation. While grain-boundary engineering has emerged as a promising strategy to accelerate the sluggish kinetics of C–N coupling, whether it can simultaneously regulate the reaction pathways of both carbon and nitrogencontaining molecules remains unclear. Hence, we employed single-active-site TiO2 as a model catalyst and constructed polycrystalline grain boundaries to boost both the activity and selectivity of urea synthesis. Atomic-scale structural inducers (Fe) served as nucleation nodes for grain-boundary formation and promote the generation of abundant oxygen vacancies, which captured and locally concentrated electrons to facilitate the adsorption, activation, and C−N coupling of key reaction intermediates. Operando electrochemical impedance spectroscopy demonstrated enhanced interfacial charge transfer and faster interfacial response frequencies. In situ infrared spectroscopy directly tracked the adsorption and activation of both reactants as well as the formation of the critical C–N bond. This work provides a general design principle for developing advanced electrocatalysts for efficient C–N coupling.
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2026
·
IF 12.2
Kangrui Zhao,Yinan Dong,Xueyun Wen,Xuejie Shen,Yiru Hu,Dongli Li,Yudong Ren,Ziyi Wang,Ali R. Jalili,Dorna Esrafilzadeh,Jieyi Zeng,Hao Li,Keyu Chu,Dongbin Wang,Yongping Huang,Jingkun Jiang,Zehui Li
Long-term exposure to formaldehyde (HCHO) in indoor environment poses a serious threat to human health. Despite recent advances, conventional electrochemical HCHO sensors face significant challenges in sensitivity, selectivity, and stability, primarily due to competitive adsorption of interfering species and strong binding of reaction intermediates on the catalyst surface. To address these limitations, we developed an ammonia-assisted bimetallic synergistic templating method to construct a Pt–Co bimetallic and nitrogen-doped carbon nanotube (Pt2.32Co–N10/CNT) electrocatalyst. Compared to commercial Pt/C, the Pt2.32Co–N10/CNT exhibits a 2.73-fold higher catalytic activity, a sensitivity of 458.62 μA·mmol/(L·cm2) (4.12 times that of Pt/C), and anti-interference performance. The CNT provides a one-dimensional and high-surface-area structure that accelerates electron transfer and promotes uniform dispersion of active sites, including Pt/Co nanoparticles and Pt/Co single atoms. Importantly, the nitrogen-rich environment forms strong coordinate bonds with Pt and Co, finely-modulating their electronic configurations to suppress methanol interference via selective adsorption. Additionally, nitrogen doping effectively weakens the CO adsorption energy, mitigating the CO-induced catalyst poisoning. With integration with screen-printed electrodes, the portable Pt2.32Co–N10/CNT sensor achieves a high sensitivity of ca. 2.38 nA/ppb and retains over 96% of its initial response after 7 days, alongside a 10-fold improvement in anti-interference ability in the alcohol-rich environment. This advancement holds transformative potential for next-generation electrochemical sensors with broad applications in environmental health, medical diagnostics, and food safety.
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RSC Advances
·
2026
·Vol. 16
·期 14
·12524-12536
·
IF 6.1
Zhaopeng Sun,Yaling Wu,Yingying Chen,Zhibo Li,Sen Lei,Yongyong Cao,Lianwen Zhu,Xuebo Cao,Zheng Yan
Previous studies have often focused on optimizing electrocatalytic performance by altering the type of metal centers or the morphological structure of catalysts to modulate their electronic structures and active sites. However, the precise regulation of metal valence states to enhance catalytic performance—particularly for trifunctional electrocatalysis in the oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER)—remains in the exploratory stage. In this study, crystalline Co–N6 materials with controllable valence states were carefully selected as precursors. Through carbonization, Co–N–C materials with similar carbon frameworks but distinct metal valence states (Co2+ and Co3+) were successfully prepared. Both experimental tests and theoretical calculations demonstrate the superior trifunctional electrocatalytic performance of Co2+–N–C. Density functional theory (DFT) calculations provide evidence for the more favorable intermediate adsorption energies and lower reaction energy barriers exhibited by Co2+–N–C. This performance advantage stems from the 3d7 electronic configuration of Co2+, which optimizes electron cloud density and strengthens Co–N bonding interactions. This work presents a new strategy for designing highly efficient electrocatalysts by elucidating the regulatory role of metal valence states.
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Advanced Sustainable Systems
·
2026
·Vol. 10
·期 2
·e01682
·
IF 5.6
Handuo Fu,Ke Fang,Shenhui Ma,Lin Wang,Yuyu Bu
In theory, the utilization of a Z-scheme photogenerated carrier transport system has the potential to significantly enhance the photogenerated voltage for photoelectrochemical overall water splitting. However, thus far, there have been no previous reports on such phenomena with silicon-based semiconductor photoelectrodes. In this study, we fabricated an n-Si/Pt/Mo-doped BiVO 4 (Mo: BVO) sandwich-like film with an intermediate carrier transfer layer to prepare a silicon-based photoelectrode with an indirect Z-scheme system. Additionally, by leveraging the lattice distortion effect over Mo: BVO, we increased the fusion ability of the sandwich-like interface between different substances. For the first time, we achieved generation of anodic displacement current via negative voltage (−0.57 V (vs. RHE)), resulting in a photocurrent density of 1.56 mA/cm 2 and a photogenerated voltage five times higher than that of the n-Si/Mo: BVO structure. Through combining experimental approaches with theoretical calculations, it has been confirmed that this realization is attributed to the contribution of the transport process within the Z-scheme system in the n-Si photoelectrode. Furthermore, milliampere-level photocurrent under negative bias was observed for the first time on an n-Si photoelectrode, providing a novel approach for constructing silicon-based photoelectrodes for overall water splitting.
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Inorganic Chemistry Frontiers
·
2026
·
IF 6.2
Yi-Xun Liu,Yu-Ting Xiong,Lin-Dong Wang,Yi-Qi Fan,Liang Wu,Hemdan S. H. Mohamed,Zhi-Yi Hu,Yu Li,Bao-Lian Su
Lithium-selenium (Li-Se) batteries have garnered significant attention recently due to their high energy density. However, selenium cathodes still face challenges such as poor conductivity and severe volume expansion. In this study, we design a novel two-dimensional nitrogen-doped lamellar porous selenium/carbon composite cathode material (Se@NLPC-P) for high performance Li-Se battery. Our results show that the lamellar structure assembled from biomass-derived stacked nitrogen-doped carbon nanosheets, possesses abundant active sites and hierarchical porosity with strong anchoring capability for selenium species. Such a unique structure additionally facilitates electron/ion transfer. Consequently, the Se@NLPC-P cathode retains a reversible capacity of 578 mAh g-1 at 0.5 C after 500 cycles, exhibiting superior rate performance and rapid reaction kinetics. This strategy on design of biomass-derived lamellar porous carbon hosts via a molecular structure-directing provides new insights for enhanced performance of Li-Se batteries.
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Nanomaterials
·
2020
·Vol. 10
·期 6
·
IF 4.324
Fang Peng,Yan Sun,Weiwei Yu,Yue Lu,Jiaming Hao,Rui Cong,Jichao Shi,Meiying Ge,Ning Dai
In this work, the compositional optimization in copper oxide/tungsten trioxide (CuO/WO3) composites was systematically studied for hydrogen sulfide (H2S) sensing. The response of CuO/WO3composites changes fromp-type ton-type as the CuO content decreases. Furthermore, thep-type response weakens while then-type response strengthens as the Cu/W molar ratio decreases from 1:0 to 1:10. The optimal Cu/W molar ratio is 1:10, at which the sensor presents the ultrahighn-type response of 1.19 × 105to 20 ppm H2S gas at 40 °C. Once the temperature rises from 40 °C to 250 °C, the CuO/WO3(1:1) sensor presents thep-nresponse transformation, and the CuO/WO3(1:1.5) sensor changes from no response ton-type response, because the increased temperature facilitates the Cu-S bonds break and weakens thep-type CuO contribution to the total response, such that the CuS bond decomposition by a thermal effect was verified by a Raman analysis. In addition, with a decrease in CuO content, the CuO is transformed from partly to completely converting to CuS, causing the resistance of CuO to decrease from increasing and, hence, a weakening mode ofp-CuO andn-WO3to the total response turns to a synergistic mode to it.
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APPLIED CATALYSIS A-GENERAL
·
2026
·
IF 4.8
Siyu Yi,Guobin Zhou,Yi Wang,Mengxia Ji,Jinman Yang,Yi Zhang,Pengcheng Yan,Zhao Mo,Zhaolong Wang,Junjie Yuan,Hui Xu,Xiaojie She
Electrocatalytic CO 2 methanation is promising for carbon neutrality but hindered by complex multi-electron transfer process, thereby obtaining low product selectivity. Herein, we report a copper single atom catalyst anchored on nitrogen doped carbon nanotubes (Cu-N-CNTs) for efficient electrocatalytic CO 2 methanation. By synergistically regulating the precursor, Cu-N 4 active sites are precisely constructed at the atomic scale, effectively suppressing copper aggregation. In situ characterization indicates that the catalyst forms a moderate local alkaline microenvironment during the reaction, suppressing C-C coupling side reactions and promoting methane pathways. In the flow cell, Cu-N-CNTs achieve a FE CH4 of 59.2% and a partial current density of 168.7 mA cm −2 at −1.577 V vs. RHE, and operated stably for 10 h. Moreover, Cu-N-CNTs exhibit remarkable methane selectivity in membrane-electrode assembly (MEA) systems employing both alkaline and pure-water electrolytes. A scaled-up MEA prototype further verifies the outstanding operational stability of Cu-N-CNTs under practical conditions. These results collectively underscore the substantial potential of Cu-N-CNTs for industrially relevant electrocatalytic CO 2 methanation.
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JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Cui Wenfang,Zhu Mingzhu,Sun Yongmei,Zhang Keyu,Ma Mei
The three-dimensional framework for lithium storage endows TiP 2 O 7 with excellent stability and considerable capacity. However, its practical application is hindered by poor electrical conductivity and an unclear understanding of its structural evolution. Herein, we present a nitrogen-doped carbon-coated TiP 2 O 7 composite prepared by a straightforward and scalable surface modification strategy, which exhibits superior rate capability compared to previous reports. Specifically, it achieves specific capacities of 435, 341, and 263 mA h g −1 at current densities of 2, 5, and 10 A g −1 , respectively. Kinetic analysis confirms that the nitrogen-doped carbon coating on TiP 2 O 7 surface significantly accelerates the interfacial charge transfer, leading to a dominant pseudocapacitive behavior. Importantly, ex-situ transmission electron microscopy characterization reveals that the TiP 2 O 7 in the composite evolves into homogeneous nanocrystals after 100 cycles at a low current density of 0.2 A g −1 . By contrast, despite the TiP 2 O 7 transforming into nanocrystals with inconsistent sizes and reduced crystallinity after 1000 cycles at a high current density of 1 A g −1 , the effective coating of N-doped carbon preserves the capacity of the anode at up to 462.6 mA h g −1 . These findings suggest that this universal strategy can significantly enhance the performance of TiP 2 O 7 -based anode materials for lithium-ion batteries. Graphical abstract
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INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
·
2022
·
IF 3.667
Yudong Pan,Zhigang Suo,Tongqing Lu
Submerged in an aqueous solution of sodium chloride (NaCl), a poly(N-isopropylacrylamide) (PNIPAM) hydrogel can be in one of two phases: swollen phase and collapsed phase. We measure the equilibrium volume of the hydrogel as a function of temperature T and ionic concentration y . The hydrogel is in the swollen phase when T and y are low, and is in the collapsed phase when T and y are high. We develop a thermodynamic model in which the free energy is a function of volume, temperature, and ionic concentration. The free energy also contains several adjustable parameters, which we best-fit to the experimental data of volume as a function of T and y . For a given pair of T and y , the free energy is a function of volume. This function has a single minimum for some pairs of ( T , y ), but two minima and a maximum for other pairs of ( T , y ). In the former, the single minimum corresponds to either a swollen or a collapsed state. In the latter, the lower minimum corresponds to a state of equilibrium, the higher minimum corresponds to a metastable state, and the maximum corresponds to an unstable state. When the two minima are equal, the hydrogel undergoes phase transition. The condition of phase transition is represented as a curve on the ( T , y ) plane. The thermodynamic model represents the experimental data well.
研究领域:
高分子科学
·
软物质物理
·
热力学
·
材料科学
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 45
·e53105
·
IF 3.057
Xiaohan Li,Ke Zhang,Jiateng Huang,Ziyao Zhou,Kaili Xie,Xiaojie Li,Wei Wei
In order to improve the flame-retardant properties of epoxy resin (EP) without sacrificing the mechanical properties, a high-efficient P/N/S-containing reactive flame retardant (VTZD) was synthesized by a facile one-pot method from vanillin, 2-aminobenzothiazole and 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), and used in epoxy-amine thermosets. When 5 wt% of VTZD was added with merely 0.31 wt% of phosphorus, the LOI value of cured resins increased to 32.7%, and the thermosets achieved a UL-94 V-0 rating. Furthermore, the peak heat release rate and the total heat release of the VTZD-modified EP decreased by up to 34.66% and 32.49%, respectively, in comparison to those of the original EP. Subsequently, the residual char morphology and structure of epoxy thermosets were investigated, as well as the pyrolysis behavior of VTZD. The flame-retardant mechanism was discussed in detail, and it confirmed that VTZD exhibited a bi-phase flame retardant effect. In addition, the mechanical properties of the cured products were well maintained and even improved. All the results demonstrated that the VTZD was a bio-based high-efficiency flame retardant for EP with a broad prospect in practical applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Haowei Liu,Pengchao Wu,Lumiao Hou,Xiaofan Zhang,He Zheng,Bolin Niu,Shaohua Liu,Jianwei Fu
Porous organic polymers (POPs) have great potential in air and water pollutant treatments. However, the cost-effective syntheis of novel POPs remains a challenge. In this work, we fabricated a new porous organic polymer with P-N linkage (PCPD) via a low-cost catalyst-free polycondensation between 3,3′-diaminobenzidine and hexachlorocyclotriphosphazene under solvothermal conditions. The chemical composition , microstructure and thermal property were characterized by FT-IR, SEM, TEM NMR, DSC , TGA and N 2 sorption . The adsorption performance of PCPD was also studied. The results revealed that PCPD owns good microporosity , N-rich skeleton as well as abundant amino/imine groups. Tested for CO 2 adsorption at 273 K/1 bar and 298 K/1 bar, PCPD exhibited superior CO 2 uptakes of 127.6 mg g −1 and 83.6 mg g −1 , respectively. Moreover, the isosteric heats of adsorption at low adsorption values was up to 33.3 kJ mol −1 . PCPD also delivered a superior removal performance towards toxic Cr (VI) from aqueous solution with equilibrium adsorption capacity of 205 mg g −1 and instantaneous adsorption capacity of 148 mg g −1 within 5 min at pH= 2. The Cr (VI) adsorption process is spontaneous and exothermic and well obeys intraparticle diffusion model, pseudo-second order kinetics , and Langmuir isotherm model. The plausible removal mechanism included electrostatic interaction, hydrogen bonding interaction, pore filling and the concurrent Cr (VI) reduction followed by in situ chelation on polymer adsorbent. PCPD would open a new field for efficient treatment of air and water pollutants due to its fascinating structure feature and excellent adsorption performance.
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LUMINESCENCE
·
2023
·Vol. 38
·期 2
·188-195
·
IF 2.9
Xin Wang,Changjian Zhu,Xuerong Yan,Sijie Cheng,Yong Zhang
N-doped carbon dots (N-CDs) were synthesized from L -glutamine and triethanolamine using a one-step hydrothermal method. The N-CDs emitting blue fluorescence had selective responses to tetracyclines (TCs) and could be used as a fluorescent probe to realize the quantitative detection and qualitative analysis of TCs. A method for the determination of TCs using the N-CDs in actual samples was successfully established. The recovery rate was maintained at 97.50–105.60%, and the relative standard deviation (RSD) was less than 3%. In addition, TCs can be visually distinguished using filter paper by the different fluorescence colours (light green, dark blue, and yellow-green) of the N-CDs/TCs system under ultraviolet light. This study provides a relatively simple method to detect and identify TCs.
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