Reaction Kinetics Mechanisms and Catalysis
·
2025
·
IF 1.7
Cheng Lijun,Lei Juan,Ren Xiaoli,Chang Hong,Ju Baihe
In this study, a series of La-α-MnO 2 catalysts with different La doping amounts were prepared by hydrothermal method. It was found that the introduction of La could reduce the crystallinity of α-MnO 2 and increase the specific surface area of the catalyst. Furthermore, La doping can significantly weaken the Mn–O bond, increase the surface Mn 3+ and O ads content, and enhance the oxygen mobility and low-temperature reducibility. The catalytic results indicated that La doping could significantly improve the catalytic oxidation performance of toluene, and 1%La-α-MnO 2 catalyst exhibited the best catalytic activity for toluene oxidation. The toluene conversion rate reaches 90% when the reaction temperature is only 215 °C. In addition, 1%La-α-MnO 2 catalyst presented good stability and repeatability during 50 h durability test under water vapor.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Chuntao Han,Kaijun Liang,Bo Yu,Kaixuan Liu,Jiajing Kou,Deng Zhao,Sha Li,Guandong Wu,Bo Zhou,Bo Li,Yufei He,Rui Ma
Er doping in Al 2 O 3 creates (Er–)O sites that promote hydrogen spillover. • The dual-site catalyst breaks the activity–stability trade-off in MCH dehydrogenation. • Er doping weakens Pt H adsorption and lowers the kinetic barrier of the rate-determining step. • The strategy extends to La and Y dopants, offering a general platform for advanced LOHC catalysts. The development of highly efficient and stable catalysts is essential for advancing methylcyclohexane (MCH)-based liquid organic hydrogen carrier (LOHC) technology, yet the performance of alumina-supported Pt-based catalysts for MCH dehydrogenation is often constrained by an inherent activity-stability trade-off. Here, we demonstrate that this limitation can be overcome by constructing a synergistic dual-site configuration comprising Pt nanoparticles and atomically dispersed (Er-)O sites. Supported on Er-doped Al 2 O 3 , uniformly sized Pt nanoparticles exhibit an exceptionally high hydrogen production rate of 2966 mmol∙g Pt −1 ∙min −1 at 300 °C (Pt/5Er-Al), outperforming most alumina-supported Pt catalysts. Remarkably, this catalyst shows excellent long-term stability, maintaining a hydrogen purity exceeding 99.9% even under high temperature and high space velocity conditions. Combined structural characterizations, kinetic studies, in situ H D exchange DRIFTS, and density functional theory calculations reveal that the doping upshifts the Pt d-band center and reduced Pt electron density, weakening H adsorption and promoting H spillover to adjacent (Er-)O sites. This synergy maintains low hydrogen coverage on Pt, lowering the kinetic barrier of the rate-determining step and accelerating H 2 evolution. The hydrogen spillover strategy mediated by atoms doped in alumina demonstrated herein opens a new avenue for designing advanced alumina-based dehydrogenation/hydrogenation catalysts. The incorporation of Er into Pt/Al 2 O 3 catalyst enhances hydrogen spillover, thereby significantly promoting the dehydrogenation activity and stability for MCH conversion. Download: Download high-res image (134KB) Download: Download full-size image
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 15
·3716-3722
·
IF 6.569
Siru Guo,Wenbin Zhang,Rong Yang,Min Zhang,Zhihua Yang,Shilie Pan
The first borate featuring a three-dimensional B–O anionic network with edge-sharing (ES) [BO4] units, Pb2.28Ba1.72B10O19 (PbBaBO), has been synthesized under ambient pressure. The squeezing effect of the 2∞[B10O19] bilayer structure on the intra-layer co-edge [BO4] leads to an extremely long B–B distance and quite small internal O–B–O angles in the [B2O6] ring.
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Nature Communications
·
2026
·
IF 18.1
Chang Xingchen,Yu Tao,Wang Han,Jiang Jie,Yan Dong,Chang Jinfa,Jin Yongcheng,Yang Yang,Hou Chun-Chao
The conversion of polyethylene terephthalate waste into valuable bulk chemicals through electrochemical upcycling represents a viable strategy for waste valorization. The direct involvement of hydroxyl species is crucial for C-C bond cleavage during ethylene glycol oxidation in polyethylene terephthalate hydrolysate, thereby enhancing catalytic efficiency. However, excessive or competitive hydroxyl adsorption often suppresses ethylene glycol adsorption and activation, impeding the formation of key intermediates toward formic acid. Here we show a crystal boundary engineering strategy to construct an asymmetric Co 2+ -O-Co δ+ bridged electrocatalyst within cobalt oxides. This design integrates two catalytic sites: Co 2+ sites preferentially facilitate hydroxyl adsorption, while Co δ+ sites exhibit enhanced affinity for ethylene glycol, thereby reducing the energy barrier for formic acid formation. Consequently, the Asy-Co 2+ -O-Co δ+ exhibits a high Faradaic efficiency of 96.12% and selectivity of 93.75%. It delivers an industrial-level current density of 1000 mA cm −2 under membrane electrode assembly conditions, with competitive stability over multiple polyethylene terephthalate hydrolysate electrolysis cycles. This study provides valuable insights for the design of advanced catalysts in the upcycling of polyethylene terephthalate waste.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Weiqiang Hu,Lei Wang,Zongqing Ma,Liming Yu,Yongchang Liu
This work proposed an innovative technology to fabricate Mo–La–O nanoparticles strengthened Mo alloys with ultrafine nano grains via freeze-drying and low temperature sintering . These novel nano Mo–La–O particles including La 7 Mo 7 O 30 , La 5 Mo 3 O 16 , La 6 Mo 2 O 15 , La 5 Mo 4 O 12 , La 4 Mo 2 O 11 and La 2 (MoO 6 ) remain coherent or semi-coherent interfaces with Mo matrix to strengthen their phase boundaries. Moreover, nano Mo–La–O particles enriched in excess oxygen absorb nearby impurity oxygen and then lead to the purification of Mo matrix. Furthermore, the low temperature sintered Mo–La x Mo y O z alloys possess high relative density (98.1%), which is due to the high sintering activities of ultrafine powders (56 nm). Comparing with available literature which involves oxide-dispersion-strengthened-molybdenum alloys (ODS-Mo), the freeze-dried Mo–La x Mo y O z alloys in our work possess the finest grain size (440 nm), the finest oxide particle size (mainly <5 nm), the highest hardness (495 HV 0.2 ) and high strength (1201 MPa) at 30% deformation.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Jie Huang,Jun-Cai Zhang,Jia-Nan Bao,Wei-Qin Huang,Hu Li,Li-Mei Lin,Zhi-Ping Huang,Shui-Yuan Chen,Gui-Lin Chen
Tin selenide (SnSe), as a direct bandgap (1.1–1.3 eV) photovoltaic absorber material, has a theoretical power conversion efficiency comparable to commercial thin-film solar technologies. However, the efficiency of experimentally fabricated SnSe solar cells is significantly lower than the theoretical value, mainly constrained by two major bottlenecks: (1) the bulk defects leading to carrier recombination and (2) the bandgap mismatch at the interface. Additionally, the environmental toxicity of the CdS and its parasitic absorption of short-wavelength light also limit the sustainable development. This study proposes and systematically investigates the all-inorganic structure of FTO/Zn(O,S)/SnSe/Carbon. Replacing traditional CdS with Zn(O,S) can achieve tunable bandgaps and eliminate Cd toxicity. Through SCAPS-1D simulation, the thickness and carrier concentration of each functional layer are optimized, and the influences of bulk defect density, interface defect density, and resistance on device performance are analyzed. Meanwhile, the S content in Zn(O,S) is adjusted, and the sulfur enrichment (S content of 70%) induces the best conduction band offset (ΔEc = 0.05 eV). The resulting optimal device exhibits an efficiency of 22.46%, Voc = 0.90 V, Jsc = 30.06 mA/cm2, and FF = 83.39%. This work establishes a universal paradigm combining nontoxic material selection (Zn(O,S)/carbon), interface thermodynamic control, and defect passivation strategies, paving the way for the commercialization of sustainable thin-film solar cells.
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INORGANIC CHEMISTRY
·
2026
·Vol. 65
·期 30
·17378-17391
·
IF 4.6
Wang Ying,Ma Yuyang,Cai Yimin,Yuan Lihua,Feng Wen,Cui Shuxun
N,O-Hybrid ligands featuring N-heterocyclic backbones
are promising
extractants for lanthanide separation, yet the governing role of N-donor
basicity in their complexation and extraction behavior toward trivalent
lanthanides remains less understood. This work investigates the effect
of N-donor basicity of two bipyridine- and bipyrimidine-based tetradentate
diamides, i.e., Et-Tol-BPDA and Et-Tol-BPymDA, on the coordination
and extraction of lanthanides. Results from solvent extraction experiments
indicate that both ligands extract light lanthanides via a cation-exchange
mechanism, while Et-Tol-BPymDA exhibits markedly higher selectivity
and efficiency with 1–6 M HNO 3 , achieving a La/Sm
separation factor of 90 at 3 M HNO 3 . The superior extraction
performance of Et-Tol-BPymDA over Et-Tol-BPDA stems from its enhanced
protonation resistance under acidic conditions, where the electron-withdrawing
effect of the extra bipyrimidine nitrogen atoms lowers the N-donor
basicity, allowing the ligand to retain its metal-binding capacity
even in highly acidic media, as validated by combined spectroscopic,
crystallographic, and theoretical analyses. The bonding analysis of
crystallographic and optimized complex structures confirms that amide
oxygen atoms serve as the primary coordination sites and produce shorter
metal–ligand bonds and stronger coordination interactions for
Et-Tol-BPDA. These findings unravel how the subtle variations in the
basicity of N-heterocycle modulate the coordination and extraction
properties of N,O-hybrid ligands toward trivalent lanthanides.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2026
·
IF 15
Deng Xu,Xie Xixiang,Zhou Xing,Jiang Lanfang,Zhu Tao,Su Rixiang,Chen Chunmei,Chen Wan,Chen Chunxia
The therapeutic efficacy of ischemic stroke (IS) treatment is severely limited by insufficient accumulation of therapeutic agents within ischemic lesions and persistent secondary injury after ischemia–reperfusion. Herein, we report a cRGD-functionalized exosome-based nanoplatform that enhances ischemic lesion-associated accumulation and antioxidative neuroprotection for the treatment of IS. Neural stem cell-derived exosomes were functionalized with cyclic RGD peptides (cRGD) and subsequently loaded with Mn₃O₄ nanoparticles to construct a hybrid nanosystem (cRGD-Exo@Mn₃O₄). The engineered exosomes preserve intrinsic brain tropism, while cRGD modification promotes preferential accumulation in ischemic regions, potentially through interaction with α v β 3 integrin that is upregulated in ischemic lesions. The incorporated Mn₃O₄ nanoparticles confer robust reactive oxygen species (ROS) scavenging capability, thereby mitigating oxidative stress in ischemic microenvironments. In vitro and in vivo studies demonstrate that cRGD-Exo@Mn₃O₄ exhibits enhanced accumulation in ischemic regions compared with non-modified counterparts. The nanosystem effectively attenuates oxidative stress and neuroinflammation, leading to reduced infarct volume, alleviation of cerebral edema, and improved neurological function in MCAO/R mice. Mechanistically, transcriptomic analysis suggests that the therapeutic effects are associated with modulation of inflammation-and cell death-related pathways, including suppression of the RIPK1/RIPK3/MLKL signaling cascade. Collectively, this study presents a rationally designed exosome-based nanoplatform integrating ischemic lesion-associated accumulation with ROS-scavenging capability. Graphical abstract
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Foods
·
2026
·Vol. 15
·期 16
·2886
·
IF 6
Luyao Wang,Xuelian Wu,Yizi Mahai,Wenjing Ma,Lin Zhou,Jing Zhang,Xinhui Wang,Jing Li
Monitoring dopamine (DA) in pork can provide useful information for assessing meat freshness and quality deterioration. In this work, an Fe@N-S-O-C nanocomposite was fabricated as an electrode modifier for DA determination. The Fe@N-S-O-C nanocomposite was synthesized via precipitation followed by calcination using melamine and ferrous sulfate as precursors. The crystal structure, surface chemical composition, and morphology were characterized by XRD, XPS, SEM, and TEM. The Fe@N-S-O-C-modified glassy carbon electrode (Fe@N-S-O-C/GCE) was then evaluated for its electrocatalytic performance toward DA. Under the optimized conditions (pH 6.0), the sensor showed linear responses to DA over 1–65 and 65–220 μM. The sensitivities for these two ranges were 4.357 and 1.685 μA μM−1cm−2, respectively, with an LOD of 40 nM. In addition, the Fe@N-S-O-C/GCE showed excellent reproducibility, good repeatability, and strong anti-interference capability against common coexisting substances. After 30 days of storage, 82.74% of the initial current response was retained by the same electrode. Practical applicability of the sensor was verified in pork samples, with recoveries of 95.97–106.73%. These results demonstrate that the Fe@N-S-O-C/GCE sensor offers a reliable and effective platform for DA detection in complex food matrices.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhimo Fang,Zhou Zhou,Xiaomeng Li,Dongyang Li,Bin Hu,Haoyu Wang,Lin Zhang,Qin Dai,Kai Li,Yao Kong,Shiguan Yang,Qiang Lu
Superexchange-mediated dual-acceptor sites enable spatial charge separation. • Synergistic single-atom and vacancy engineering creates multifunctional sites. • Cu SA -TO-O V delivered excellent corresponding turnover frequencies of 177.52 h −1 . • The photo-Fenton system exhibited wide pH adaptability and anti-interference. Synchronously and efficiently utilizing photogenerated electrons and holes remains a significant challenge in Fenton-like reaction. Herein, the Cu single-atom (Cu SA ) and oxygen vacancy (O V ) co-modified TiO 2 nanoflake-like catalyst is successfully synthesized. O V modulate the electronic coupling interaction, which is proposed to trigger superexchange -mediated electron transfer from Cu 3 d x 2 − y 2 to Ti 3 d xy via O 2 p y orbitals. Specifically, Cu SA serves as the hole-accepting site for 1 O 2 generation, while O V and Ti 3+ functions as the electron-accepting site for •OH production and contaminant adsorption. The substrate enrichment effect and the free radical/non-radical coupling interaction significantly enhances photo-Fenton catalytic performance, achieving superior sulfanilamide removal efficiency across a broad pH range (3–11) and a high turnover frequency of of 177.52 h −1 . This work not only highlights the potential of active site engineering in designing photo-Fenton catalysts but also advances the development of efficient and sustainable water purification solutions.
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INORGANIC CHEMISTRY
·
2026
·Vol. 65
·期 30
·17706-17716
·
IF 4.6
Jin Cheng-An,Huang Zhiling,Zhang Lianyang,Meng Yue,Xia Guanghua,Xia Shengjie
Photocatalytic nitrogen reduction to ammonia intrinsically
relies
on the synergistic activation of both N 2 and H 2 O molecules by the catalyst. However, achieving simultaneous and
efficient activation of these two species on a single catalyst surface
remains a formidable challenge, constrained by poor N 2 adsorption
and the high dissociation energy barrier of the N≡N triple
bond. To address this, a vacancy engineering strategy was adopted
to design and fabricate a Bi 2 WO 6 photocatalyst
featuring both bismuth and oxygen dual vacancies (V Bi+O -BWO). The oxygen vacancies trap photogenerated electrons for N 2 activation, while bismuth vacancies enhance H 2 O adsorption and facilitate proton generation. Through this synergistic
effect, the photocatalytic nitrogen reduction performance was significantly
enhanced. Experimental results show that V Bi+O -BWO achieves
an ammonia production rate of 113.14 μmol·g –1 ·h –1 , a 4.9-fold enhancement over the unmodified
catalyst. N 2 -TPD results demonstrate that the dual vacancies
effectively enhance N 2 chemisorption, facilitating subsequent
activation. In situ FTIR confirms that N 2 adsorbs and converts
on Bi 2 WO 6 via a distal pathway. This study provides
new insights into the development of high-efficiency dual-vacancy
photocatalytic materials.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2026
·
IF 4.6
Shaolong Liu,Zhifeng Su,Zhiming Qiu,Xitao Guo,Minghua Liu,Yurong Yan
Biomass-derived porous carbon holds great promise as an electrode material for supercapacitors due to its low cost and sustainability. However, single-activator strategies typically fail to achieve microporous-mesoporous structure with high specific surface area (SSA) and micropore volume of such carbon materials, thereby limiting their capacitive performance. Therefore, inspired by the pyrolysis behavior of sodium lignosulfonate, we innovatively propose a novel activation system for preparing N/O/S co-doped biomass microporous-mesoporous carbon (SLCA): utilizing chitosan carbon and sodium lignosulfonate as self-doping carbon sources, potassium hydroxide as the primary activator, and sodium lignosulfonate as the self-templating activator. The microporous volume is a key factor influencing specific capacitance. Specifically, the SLCA-700 (activated at 700 °C) has a microporous-mesoporous structure with abundant N/O/S heteroatoms doping and a SSA of 2378.7 m 2 ·g −1 , and achieves a high micropore volume of 0.84 cm 3 ·g −1 , which is 0.24 cm 3 ·g −1 higher than that of the KOH activation system alone. Furthermore, the SLCA-700 electrode exhibits an outstanding specific capacitance of 305.9 F·g −1 at 0.5 A·g −1 , and supercapacitor shows excellent cycling stability (97.0% capacitance retention after 10,000 cycles). This study proposes a dual activation mechanism for preparing microporous-mesoporous carbon with a high SSA, providing a viable strategy for producing high-performance supercapacitor electrode materials.
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