CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Zhikang Xu,Yunxing Zhang,Xing Wu,Haibo Zhu
Co-based catalysts are emerging as one of the most promising catalysts for propane dehydrogenation (PDH) due to their abundant availability, environmental friendliness, and efficient activation of the C–H bond. Isolated Co(II) is recognized as the active site for activating the C–H bond in PDH; however, the controllable synthesis of Co catalysts with well-defined isolated Co(II) remains a challenge. In this study, a direct and straightforward route was developed for the synthesis of Co-Beta using a fluorine-assisted hydrothermal crystallization method. The structure of Co-Beta was studied using various characterization tools, including XRD, STEM, H 2 -TPR, UV–vis, XPS, solid-state 29 Si MAS NMR and EXAFS techniques. It was confirmed that the Co species are incorporated into the structure of Beta zeolite, existing as isolated Co(II) sites embedded within the framework of Beta zeolite. The optimized catalyst, 1.0Co-Beta, exhibits excellent performance in PDH, achieving a propane conversion of approximately 50 % and propylene selectivity of around 96 % at 600 °C. This performance surpasses that of previously reported non-noble metal catalysts. This study provides fundamental insights on the design and synthesis of highly dispersed metal oxide catalysts for PDH.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2025
·Vol. 36
·期 25
·1-13
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IF 2.8
Zhang Yuexing,Feng Wenlin,Ullah Arif
To address the need for high-sensitivity carbon monoxide (CO) gas sensing at room temperature, a CO gas sensor based on Au-modified tin oxide/zinc oxide (SnO₂/ZnO) nanocomposites is fabricated. SnO₂ nanoparticles, ZnO nanosheets, and Au nanoparticles (AuNPs) were synthesized using sacrificial template, hydrothermal, and chemical reduction methods, respectively. The resulting nanocomposite was then drop-casted onto interdigitated electrodes and dried to obtain the CO gas sensor. The performance of the sensor was evaluated using a custom airtight chamber and a semiconductor parameter analyzer. The n–n heterojunction between SnO₂ and ZnO significantly increased oxygen vacancy in the composite material, enhancing surface chemisorption of oxygen. Moreover, the catalytic sensitization effect of AuNPs facilitated electron migration, while their inherent spillover effect promoted the activation of gas molecule interactions. Consequently, the sensor exhibited a high response (22.11%) to 70 ppm CO at room temperature, along with excellent stability, selectivity, and anti-interference capabilities. This work offers a promising approach for developing highly sensitive room-temperature gas sensors.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Wei Lin,Wenxue Min,Qimeng Zhang,Shunzhang You,Song Han,Chenghao Yang
O3-type layered oxides have become a research hotspot in the development of sodium-ion batteries owing to their simple synthesis method and competitive theoretical capacity. However, their practical applications still face enormous challenges, especially concerning insufficient cyclic stability and poor kinetic performance. Herein, the Sb/Al co-doping NaNi 0.48 Mn 0.49 Sb 0.01 Al 0.02 O 2 (NMSA) material was produced via sol-gel process. Sodium-ion kinetics were investigated through Cyclic Voltammetry (CV) and Galvanostatic Intermittent Titration Technique (GITT), while the charge compensation mechanism was examined via ex-situ X-ray Photoelectron Spectroscopy (XPS). The successful doping of Al improves the stability of the transition metal oxide layer (TMO 2 ), thereby extending the cycle life of material. In-situ X-ray Diffraction (XRD) analysis reveals successful inhibition of the irreversible O3-P3 phase transition. In addition, Sb-doping increases the number of ions involved in charge compensation, thereby elevating the discharge specific capacity. Therefore, the NMSA material can provide a discharge specific capacity of 128.5 mAh g −1 at 0.1C and a capacity retention rate of 85 % after 100 cycles at 1C. Finally, the interface stability of the cycled material was studied to investigate the stability of the cathode/electrolytes interface (CEI) layer. This study provides new innovative views on proposing advanced cathode for high-energy sodium-ion batteries.
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CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Pengheng Li,Xing Zhu,Min Lin,Henglong Li
Chemical-looping preferential oxidation (CL-PROX) technology has become an efficient method for removing CO from hydrogen-rich gases. In this study, by introducing hydroxyl groups to regulate the interaction between Cu and Ce, the efficient conversion of CO and the retention of H 2 were successfully achieved, thus bringing excellent CL-PROX performance. Characterizations show that 10CuCe-OH with introduced hydroxyl groups exhibit small particle size, low crystallinity, high surface concentrations of Cu + and Ce 3+ , abundant oxygen vacancies, excellent reducibility and strong oxidation activity. This is attributed to the fact that hydroxyl groups strengthen the interaction between Cu–O–Ce, forming more Cu + –O v –Ce 3+ structures. At 200 °C, the conversion of CO over 10CuCe-OH exceeds 90 %, while the conversion of H 2 is less than 4 %, which is far superior to that of 10CuCe. The results of in-situ Fourier transform infrared spectroscopy ( In-situ FTIR) and DFT calculations indicate that 10CuCe-OH possesses excellent adsorption and CO conversion capabilities. Overall, this work provides a new strategy for the design of high efficiency CL-PROX catalysts.
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Micro and Nanostructures
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2025
·
IF 3
Zhou Huang,Feng Nan,Zhilong Zhang,Weiyu Feng,Lei Zhou
Silicon (Si) photodetectors are of great importance due to their many scientific and industrial applications, including optical interconnects, spectroscopy, optical communications, and semiconductor device processing. However, the responsivity of Si photodetectors drops sharply at shorter wavelengths due to their high light absorption coefficient and increased reflectivity in this range. In this report, a hybrid Si photodetector architecture is demonstrated by integrating an ultrathin fluorine- and nitrogen-co-doped carbon quantum dots (fnCQDs) layer using a facile fabrication technique. The results show that the hybrid device achieves a broadband photoresponse. The optimized incorporation of fnCQDs enhances the short-wavelength range responsivity between 300 nm and 550 nm, while simultaneously maintaining nearly identical fast rise times at the peak as the conventional bare Si device under 0 V working voltage. Moreover, the photoresponsivity and gain of the engineered optimal device are found to be approximately 0.012 A/W and 328, respectively, at a wavelength of 365 nm. Additionally, the maximum photocurrent-to-dark current ratio (@365 nm) of this hybrid device under a 0.01 V bias reaches approximately 6200, nearly six times greater than that of the standard reference device. The proposed approach and findings demonstrate the significant potential of fnCQDs for applications in hybrid photodetectors and related technologies.
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CONSTRUCTION AND BUILDING MATERIALS
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2025
·
IF 8
Xiao Yang,Jinxiang Hong,Zijia Xiong,Wei Liu,Minghui Gong,Jinliang Cheng,Zhenghong Xu,Chuanqing Fu
Polyurethane (PU) is recognized as a promising material for asphalt modification due to its tunable physicochemical properties. To reduce reliance on petroleum-based polyols, this study employed bio-derived castor oil (CO) combined with polytetrahydrofuran (PTMEG), diphenylmethane diisocyanate (MDI), and 1,4-butanediol (BDO) as raw materials. Polyether-type PU (PTMEG-MDI) and polyether/castor oil composite PU (PTMEG/CO-MDI) were successfully synthesized through controlled hard segment content ( C h ) and isocyanate index ( r ), followed by application in asphalt modification. The structure-property relationships were investigated using FTIR, TGA, DSC, and mechanical testing systems. The results demonstrated that the incorporation of CO significantly enhanced the comprehensive performance of PU composites. Compared to the single polyether-type PU, the PTMEG/CO composite PU exhibited better thermal stability, mechanical strength, and elongation at break. Increasing C h continuously improved the Shore hardness and tensile strength of PU, while reducing its thermal stability and elongation at break. When r reached 1.2, the PU molecular chains attained an optimal stability equilibrium state. FTIR analysis confirmed chemical reactions between the -NCO groups in PU and active components of asphalt, forming characteristic urethane absorption peaks, thereby achieving chemical bonding modification. In terms of asphalt modification performance, the PTMEG/CO-MDI system notably enhanced high-temperature stability while maintaining favorable low-temperature performance. This research establishes fundamental correlations between PU molecular design parameters ( C h and r ) and asphalt modification performance, providing theoretical guidance for developing eco-friendly high-performance asphalt modifiers.
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Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 18
·6606-6614
·
IF 5.7
Muhammad,Zengce Liu,Junchun Li,Yuanyuan Sheng,Yajing Chang,Ping Chen,Yang Jiang
Lead-free halide perovskites have been developed and have received increasing attention in optoelectronic applications due to their non-toxicity. However, single perovskite phosphors that emit vibrant, tunable-color-temperature white-light are rare. Herein, we used the anti-solvent precipitation method to develop white light-emitting diodes (WLEDs) based on rare-earth-based Sb3+ and Mn2+ co-doped Cs2KYCl6 microcrystals (MCs). The Cs2KYCl6 MCs exhibit tunable dual emissions covering a wideband ascribed to the emission of self-trapped excitons (STEs) from Sb3+ and the 4T1 to 6A1d–d transition of Mn2+. The optimal photoluminescence quantum yield (PLQY) of doped Cs2KYCl6 is 65.78%. The energy transfer process from Sb3+ to Mn2+ is revealed. WLEDs have been successfully constructed by combining the dual emissions from STEs of Sb3+ and the d–d transition of Mn2+. These WLEDs demonstrate impressive optical performance, including CIE chromaticity coordinates (0.3483, 0.4125) and a color rendering index (CRI) of 85.4. This work provides an effective strategy for developing WLEDs based on a single-component material, lead-free perovskites.
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Catalysts
·
2025
·Vol. 15
·期 12
·1156
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IF 4
Quan Zhou,Lewa Zhang,Ziluo Wang,Qiutong Wang,Chenyuan Zhu
Electrochemical nitrate reduction to ammonia offers a sustainable route for nitrogen fixation, yet achieving high efficiency and selectivity remains challenging. Here, a Sustainion-enabled Cu/Co tandem catalyst is developed to couple compositional synergy with ionomer-mediated interfacial regulation. The optimized Cu60Co40/Sus/C electrode delivers a Faradaic efficiency of 91.3% and an NH3yield rate of 2.63 mmol gcat.−1h−1at −0.3 V vs. RHE, surpassing Cu-Co/Nafion/C and Cu-Co/C counterparts. Structural analyses confirm that Sustainion prevents nanoparticle aggregation and maintains robust Cu/Co interfaces. Electrochemical and in situ spectroscopic studies reveal that the cationic quaternary ammonium groups of Sustainion electrostatically enrich NO3−/NO2−intermediates, facilitating their adsorption and hydrogenation toward NH3formation. The combined structural stabilization and intermediate modulation enable efficient tandem catalysis between Cu-driven nitrate activation and Co-mediated hydrogenation. This work provides molecular-level insight into ionomer–catalyst interactions and highlights interfacial engineering as a powerful strategy for sustainable ammonia synthesis.
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ACS Nano
·
2025
·
IF 16
Ruonan Li,Runlin Ma,Li-Li Zhang,Wei Ma,Gonglei Shao,Xu Zhang,Yun Tian,Menggai Jiao,Zhen Zhou
To tackle the challenge in electrochemical nitrogen fixing and reduction in aqueous electrolytes, the conventional approach has been to suppress the competitive hydrogen evolution reaction. Nonetheless, proton provision is a crucial step in the nitrogen reduction pathway to produce ammonia, and a single active site faces the daunting task in striking a balance between high nitrogen fixation efficiency and fast protonation kinetics. This work presents a harmonic strategy featuring atomically dispersed dual Fe–Mo sites anchored in an N-doped carbon (FeMoNC) substrate, where a low-spin Fe center with enriched empty d orbitals aids in nitrogen fixation and activation, and the adjacent Mo site accelerates the protonation kinetics of N-containing intermediates at the Fe site via a distal associative mechanism. Driven by this co-catalytic mechanism, the FeMoNC catalyst achieves a Faradaic efficiency of 37.42%, marking a significant improvement of 7.8- and 10.6-fold over Fe or Mo single-atom catalysts, respectively. Furthermore, an excellent NH3 yield of 54.40 μg h–1 mgcat.–1 is realized in a flow cell by enhancing mass transfer. This study provides valuable insights into diatomic co-catalytic mechanisms for electrochemical ammonia synthesis.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Minghan Zhou,Tongtong Gao,Shuanglong Chen,Xuejiao Wang,Qiushi Wang,Cailong Liu
Due to its unique advantages including non-contact operation, high sensitivity, and exceptional spatial resolution, nanoscale optical thermometry has become an indispensable technique with widespread applications in micro/nanoelectronics, integrated photonic systems, and biomedical engineering. Here, Yb 3+ /Tm 3+ co-doped AlN nanowires were successfully synthesized via an arc-discharge method. The nanowires, characterized by X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, energy-dispersive X-ray spectroscopy, scanning electron microscopy, and transmission electron microscopy, exhibit lengths of several micrometers and uniform diameters ranging from 10 to 20 nm, yielding a high aspect ratio. Under 980 nm excitation, the nanowires display distinct up-conversion (UC) luminescence, with emission bands at 544 nm (green), 654 nm and 691 nm (red), and 795 nm (near-infrared), corresponding to Tm 3+ ion transitions. The AlN:Yb 3+ /Tm 3+ nanowires show excellent optical thermometry performance, achieving a maximum relative sensitivity ( S r ) of 3.32 % K −1 at 298 K and a temperature resolution ( δT ) of 0.009 K. These results underscore the potential of AlN:Yb 3+ /Tm 3+ nanowires for advanced optical temperature sensing in nanotechnology, biomedical applications, and high-resolution thermal imaging.
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Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Yulong Luo,Pan Chen,Hanyu Jin,Shiyi Zhao,Zhenzhen Huang
Background The presence of antibiotics like tetracycline (TC) in aquatic environments poses serious risks to ecosystems and public health, primarily by contributing to antibiotic resistance. As a response to this challenge, biochar-based adsorbents have gained attention for their sustainability and efficiency. Methods This study introduces sulfur and nitrogen co-doped modified sludge biochar (NSBC), synthesized using thiourea, urea, and ammonium bisulfate, as a novel adsorbent for TC removal. Its performance was compared to unmodified sludge biochar (SBC), sulfur-doped (SSBC), and nitrogen-doped (NBC) variants. NSBC showed superior adsorption capacity (83.01 mg/g) and removal efficiency (83.01 %). Key parameters—temperature, dosage, and pH—were optimized, with pH 5 and elevated temperature yielding the best results. Adsorption followed a pseudo-second-order kinetic model and fit best with the Freundlich and Sips isotherms, indicating chemisorption on a heterogeneous surface. Significant Findings NSBC demonstrated enhanced affinity for TC due to its surface characteristics, confirmed by electrostatic potential and HOMO-LUMO analyses, which showed active electron-donating and accepting regions. These findings highlight NSBC as a promising, low-cost, and sustainable option for antibiotic removal in water treatment, offering a viable solution to mitigate pharmaceutical pollution in aquatic systems.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Lu Wen,Chaojie Li,Houqun Xiao,Huazhou Hu,Chaobin Lai,Luocai Yi,Qingjun Chen
The ZrCo alloy stands out as one of the most promising candidates for hydrogen isotope storage materials in nuclear fusion, owing to its extremely low equilibrium hydrogen pressure (10 −3 Pa, 20 ℃). However, ZrCo experiences severe disproportionation reactions during dehydrogenation/hydrogenation processes, which lead to significant performance degradation. To address this, we have introduced V and Ti into the ZrCo alloy, resulting in the Zr 0.8 V x Ti 0.2-x Co (x = 0–0.15) series. Our research indicates that the addition of V and Ti reduces the lattice parameters, thereby increasing the platform pressure for hydrogen desorption and decreasing the enthalpy and entropy of the desorption reaction. This modification allows for a lower desorption temperature and enhances the alloy's resistance to hydrogen-induced degradation. Remarkably, the hydrogen storage capacity of the Zr 0.8 V x Ti 0.2-x Co(x = 0–0.15) alloys remains stable after 19 h of desorption. Furthermore, the Zr 0.8 V 0.05 Ti 0.15 Co alloy demonstrates exceptional cycling stability, retaining over 99 % of its hydrogen storage capacity after 50 cycles. First-principles calculations have clarified the adsorption energies of hydrogen at different binding sites, revealing the following order of stability: E b(Ti-V) < E b(Zr-Ti) < E b(V-Zr) < E b(Zr-Zr) . The hydrogen absorption and desorption kinetics of the Zr 0.8 V x Ti 0.2-x Co alloys follow the trend: Zr 0.8 V 0.15 Ti 0.05 Co > Zr 0.8 V 0.1 Ti 0.1 Co > Zr 0.8 V 0.05 Ti 0.15 Co > ZrCo, indicating optimized performance with the introduction of V and Ti. This study not only provides a viable solution to the disproportionation issue in ZrCo alloys but also offers valuable insights into the design of high-performance hydrogen isotope storage materials for nuclear fusion applications.
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