APPLIED CATALYSIS B-ENVIRONMENTAL
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2026
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IF 21.1
Jie Yang,Yu Luo,Zhichao Chen,Junjiang Zhu
The selective catalytic reduction of NO with NH 3 (NH 3 −SCR) reaction is governed by the interplay of surface acidity and redox activity, yet the mechanism of their cooperation remains elusive. Herein, Ce–O–W linkages were constructed on Ce/ZrO 2 to couple Ce 4+ /Ce 3+ redox cycle with tungsten-derived acidity. Operando DRIFTS and transient experiments revealed that gaseous NO reacts directly with NH 3 adsorbed on Lewis Ce 4+ sites, following an Eley–Rideal pathway. Brønsted acid sites from Ce–O–W acted as NH 4 + reservoirs, dynamically replenishing Lewis-bound NH 3 and sustaining continuous reactivity. Operando UV–vis spectroscopy confirmed that NO + NH 3 exposure reduced Ce 4+ to Ce 3+ , while O 2 re-oxidized Ce 3+ to Ce 4+ , establishing the redox cycle. Density functional theory calculations supported that NH 3 dehydrogenation on Ce sites and subsequent coupling with gaseous NO were energetically favorable, while O 2 -assisted Ce 3+ re-oxidation required the highest energy barrier. These results highlight the cooperative function of Ce–O–W acid–redox site in promoting SCR activity through dynamic L–NH 3 /B–NH 4 + interplay and sustained Ce redox cycling.
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Science China-Chemistry
·
2024
·
IF 10.4
Kimaka P. Rinel R.,Wang Ping,He Miao,Meng Senyao,Yao Jiasai,Li Huawei,Yang Cheng,Li Zhenxing
Polymetallic layered double hydroxides are promising cost-effective catalysts for the oxygen evolution reaction (OER) due to their versatile anionic and cationic tunability. Nevertheless, several challenges persist, notably, issues related to low electrical conductivity, poor catalytic activity, and stability, especially at high current density. Herein, we report the design of Ce- and La-doped CoNiFe-layered double hydroxide (CeLaCoNiFe-LDH) nanosheets through a facile and scalable in situ self-assembly strategy that displays enhanced OER activity. Experimental and theoretical investigations provide insights into the impact of Ce-and La-doping by comparing CeCoNiFe-LDH, LaCoNiFe-LDH, and pristine CoNiFe-LDH, all synthesized using the same methodology. These results reveal that doping Ce 3+ and La 3+ into CoNiFe-LDH substantially improves its electronic structure, resulting in enhanced conductivity, more oxygen vacancies (Vo), electron interaction, and active site formation. Consequently, significantly reduced overpotentials of 175, 314, and 424 mV at 10, 100, and 500 mA cm −2 , respectively, and a highly stable current density of 120 h in 1 M KOH were achieved. Notably, these performance metrics surpass those of unmodified LDHs and are competitive with many lanthanide-doped transition metal-based LDH electrocatalysts, as well as noble metal catalysts like ruthenium catalysts. This work represents a pioneering effort in doping Ce 3+ and La 3+ ions into a functional CoNiFe-based electrocatalyst, offering inspiring OER performance and scalability potential.
研究领域:
材料科学
·
电化学
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Long Li,Huyin Su,Licheng Zhou,Zhixiang Hu,Tiankun Li,Bingbing Chen,Hua-Yao Li,Huan Liu
Metal sulfide-based gas sensors have the advantage of high sensitivity at room temperature, enabling high integration and low power consumption. However, a trade-off between low baseline resistance and good long-term stability at room temperature still needs to be addressed. Therefore, a single-atom Ce-targeted regulation strategy for p-SnS/n-SnS 2 was proposed. By doping different amounts of Ce, the amount and size of SnS quantum dots on the surface of SnS 2 can be regulated. Furthermore, Sn-S-Ce bonds are formed by combining single-atom Ce with SnS, which effectively hinders the growth and oxidation of SnS quantum dots, as evidenced by STEM, XPS, DFT, FTIR and EAXFS methods. Due to the unique energy band structure of p-SnS and n-SnS 2 , Ce-doped SnS quantum dots serve as electronic sensitizers, effectively increasing the carrier concentration in SnS 2 . The optimal gas sensor based on the 1% Ce-doped SnS/SnS 2 composites enables high sensitivity (with a response of 22.1 to 1 ppm NO 2 ), ultralow detection limit (1 ppb), excellent long-term stability at room temperature, and a lower baseline resistance. This engineering strategy of metal sulfide semiconductor heterostructures through single-atom targeted regulation provides new insights for further optimizing the composite system.
研究领域:
材料科学
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半导体物理
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传感技术
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纳米材料
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表面化学
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环境监测
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Ziqiang Jiang,Jingtian Li,Guodong Sun,Weihua Luo,Peng Zhao
Transparent ceramics Y 3 Al 5 O 12 : Ce 3+ (YAG: Ce) were prepared by the spark plasma sintering (SPS) process with B 2 O 3 acting as the sintering additive. The effect of B 2 O 3 on the microstructure and luminescent properties were examined. With the help of the liquid phase created by the low melting point B 2 O 3 additives, the carbon contamination of the SPS prepared YAG: Ce ceramics was remarkably relieved, the relative density and the in-line transmittance were enhanced, and the starting temperature of densification was lowered by approximately 170 °C. Moreover, the B 2 O 3 additive could enter into the YAG host lattice as a dopant . Consequently, the smaller B 3+ ions replaced the Al 3+ ions, enhancing the crystal field splitting of Ce 3+ and significantly redshifting its 5d→4 f emission band.
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CERAMICS INTERNATIONAL
·
2022
·Vol. 49
·期 4
·6100-6112
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IF 5.532
Yu Xia,Jianwei Man,Xiaodong Wu,Shuntian Huang,Anqi Lu,Xiaodong Shen,Sheng Cui,Xiangbao Chen,Gengtao Fu
The development of efficient photocatalysts with high activity and high selectivity remains the biggest challenge limiting the development of photocatalysis . Herein, a novel Ce-doped TiO 2 aerogel (Ce–TiO 2 ) is synthesized via a simple one-step sol-gel technique, which integrates simultaneously supercritical drying, heat treatment, nano structuring, and self-diffusion for the formation of the Ce embedded in porous TiO 2 matrix with strong coupling. The Ce–TiO 2 aerogel exhibits typically homogeneous structures, and the resulting Ce–TiO 2 aerogel shows an extremely large BET specific surface area of 246.53 m 2 /g, which is responsible for the much-enhanced photocatalytic active sites. The incorporation of Ce has induced an impurity level in the band gap of the pristine TiO 2 aerogel, extending the light response range to the visible region. Meanwhile, the structural and compositional advantages are exploited to achieve fast separation and transfer of charge carriers. The yields of CH 4 and CO are 0.6 and 2.1 μmol/(g·h) under visible light without any additional co-catalysts or sacrificial agents, which are 1.4 and 15.6 times as high as those of pristine TiO 2 aerogel. In addition, the yields of CH 4 and CO are as high as 10.3 and 26.9 μmol/(g·h) under simulated solar spectrum conditions, which are 34.3 and 1.6 times as high as those of pristine TiO 2 aerogel. The density function theory (DFT) calculation confirms that the resulting Ce–TiO 2 aerogel enables efficient H 2 O and CO 2 adsorption and activation through the Ce cooperation and O vacancy, which greatly improves photocatalytic CO 2 reduction. This work reveals the development of aerogel photocatalyst for the photoreduction of CO 2 with H 2 O and CO 2 as feedstock .
研究领域:
材料科学
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光催化
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环境工程
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纳米技术
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能量转换
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Nanomaterials
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2026
·Vol. 16
·期 16
·1015
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IF 4.8
Xin Lin,Jiayi Tu,Jinyun Zhao,Fangfang Wu,Xingping Fu,Hao Lin,Jiapeng Hu
In this study, a hierarchical rod-assembled, polypyrrole-modified Ce–Al–La trimetallic metal–organic framework (Ce–Al–La–MOFs@PPy) composite was successfully synthesized through a solvothermal method combined with in situ polymerization for efficient fluoride removal from aqueous solutions. The incorporation of conductive polypyrrole (PPy) into the multimetallic MOFs effectively enhanced the structural stability, surface properties, and adsorption performance of the material. Adsorption experiments demonstrated that the optimal metal-to-ligand molar ratio was 3:1, and the prepared adsorbent exhibited excellent fluoride removal performance under weakly acidic conditions (pH = 5). The maximum adsorption capacity calculated from the Langmuir model reached 216.92 mg·g−1at 45 °C. Adsorption kinetics were well fitted by the pseudo-second-order model, indicating that the adsorption process was mainly governed by chemisorption. Mechanism investigations based on FTIR and XPS analyses demonstrated that fluoride removal mainly occurred through electrostatic attraction and coordination exchange between fluoride ions and the Ce/La active sites. In addition, the composite exhibited good selectivity, anti-interference ability toward coexisting ions, and satisfactory fluoride removal performance in practical industrial wastewater. These findings suggest that Ce–Al–La–MOFs@PPy is a promising adsorbent for efficient fluoride-contaminated wastewater treatment.
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Small
·
2026
·
IF 11.8
Junbin Li,Jiaqi Tang,Jingwen Ma,Zhijun Zhang,Xiang Li
To address the stability limitations of conventional Fe─N─C catalysts caused by H 2 O 2 byproducts and reactive oxygen species (ROS), an innovative dual-metal single-atom synergistic strategy is developed, resulting in the fabrication of a hierarchically porous hollow carbon fiber catalyst co-anchored with Fe and Ce dual-atom sites (FeCe DAC/HCNF). The catalyst features an interconnected network of hollow channels and carbon nanocages, forming a hierarchical micro/mesoporous structure (specific surface area: 935.24 m 2 g −1 ) that enhances mass transport efficiency and maximizes exposure of active sites. The dual-atom site is developed to achieve a “kill two birds with one stone” effect: Ce single-atom sites adjacent to Fe centers not only effectively scavenge ROS and decompose H 2 O 2 , but also modulate the Fe centers, thereby synergistically enhancing the intrinsic ORR activity while mitigating carbon matrix degradation. The FeCe DAC/HCNF catalyst exhibits exceptional electrochemical performance and stability in both alkaline and acidic media. When integrated into zinc-air batteries, it achieves superior device performance compared to Fe─N─C catalysts, with a remarkable cycling durability of 2300 cycles (∼1100 h of stable operation). This work breaks the traditional activity-stability trade-off of catalysts, providing a novel pathway for developing high-durability zinc-air batteries.
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CERAMICS INTERNATIONAL
·
2026
·
IF 6
Baoyong Huang,Xiuyun Zhang,Jianwei Song,Yijie Zeng,Yuyang Tang,Yiqi Sang,Yunyun Zhao,Guisheng Zhu,Laijun liu,Huarui Xu
The microstructure engineering of BaTiO 3 -based ceramic systems serves as an essential prerequisite to attain superior dielectric stability and reliability in modern multilayer ceramic capacitors (MLCCs). In this study, the effects of Ca doping on phase composition, microstructure, defect evolution, and dielectric temperature stability were systematically investigated in a novel BaTiO 3 -1 at%CeO 2 -3 at%MgO- x at%CaCO 3 ( x = 0, 2, 4, 6, 8) ceramic system. The results show that Ca doping promotes the tetragonality of the structure to increase first and then decrease. The addition of Ca 2+ changed the original defect composition of the ceramics: Ca 2+ promotes the conversion of Ce 3+ to Ce 4+ , reduces the reduction of Ti 4+ , and regulates the concentration of oxygen vacancies. The addition of Ca 2+ reduces the grain boundary activation energy ( 1.86 eV to 1.33 eV ), and reduces the carrier concentration to improve the ceramic resistivity. Ca 2+ promotes the enrichment of doped ions at the grain boundary to form a ' core-shell ' structure, which is characterized by broadened and suppressed dielectric peaks. When x = 6 at %, the ceramics meet the X8R specification (|( C T - C 25°C )/ C 25°C ×100%| ≤ 15%, T ∈ [-55°C, 150°C]), the dielectric constant at room temperature is 2802, and the dielectric loss is less than 0.02. This study reveals the Ca 2+ induced multi-ion synergistic regulation mechanism, which provides an experimental basis for the development of high stability and low loss lead-free MLCC dielectric materials that meet the X8R standard.
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SENSORS AND ACTUATORS B-CHEMICAL
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2026
·
IF 8.3
Yiao Xu,Xingtai Chen,Yujun Guo,Jiayi Qu,Changsheng Ji,Davoud Dastan,Zhigang Li,Xiaoming Tan,Feifei Wang,Xiaoning Wang,Xi-Tao Yin
First report of Ce-doped CdS nanomaterials as n-butanol sensors. • Sensor exhibits a maximum response value of 224.2 at 50 ppm n-butanol. • Sensor demonstrates extremely fast response/recovery times for n-butanol. • Sensor exhibits excellent selectivity toward n-butanol. • Possesses outstanding long-term stability. Ce-doped CdS nanomaterials were successfully synthesized by a hydrothermal method. Various characterization techniques confirmed the successful substitution of Cd sites in the CdS lattice by Ce ions. Gas-sensing tests demonstrated that at an optimal Ce doping level of 1 at%, the sensor exhibited an outstanding response of 224.2–50 ppm n-butanol at 175 ℃, which is approximately 3.5 times higher than that of pristine CdS. Meanwhile, it displayed excellent response/recovery characteristics (14 s/10 s). Furthermore, the sensor showed superior selectivity toward n-butanol, with a negligible response to benzene gas. Mechanism analysis revealed that the abundant sulfur vacancies induced by Ce doping, along with the multivalent redox catalytic effect of Ce ions, are the key factors contributing to the significant enhancement of gas-sensing performance. Download: Download high-res image (142KB) Download: Download full-size image
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Ao Sun,Mingliang Sun,Sen Yang,Tianyi Yang,Hongwei Zhu,Erhan Qin,Cong Wang,Xin Li,Yan Xing
Ce-doped Bi 7 O 9 I 3 /TiO 2 S-scheme heterojunction was constructed for PNRR. • Ce doping modulates the Fermi level and strengthens the built-in electric field. • The enhanced BIEF promotes directional charge transfer across the heterojunction. • Strengthened charge separation improves photocatalytic N 2 fixation performance. • N 2 reduction proceeds via an associative distal reaction pathway. Photocatalytic nitrogen fixation offers a sustainable route for ammonia synthesis under ambient conditions, but its practical application is severely limited by inefficient charge separation and sluggish interfacial charge-transfer kinetics. Herein, we develop a Ce-doped Bi 7 O 9 I 3 /TiO 2 S-scheme heterojunction through dopant-mediated Fermi level engineering to strengthen the interfacial built-in electric field (BIEF) and enhance photocatalytic nitrogen fixation. The charge transfer behavior and N 2 reduction mechanism was investigated using photoelectrochemical measurements, Kelvin probe force microscopy (KPFM), ultraviolet photoelectron spectroscopy (UPS), theoretical calculations, and in situ FT-IR spectroscopy. Ce doping shifts the Fermi level of Bi 7 O 9 I 3 upward, thereby enlarging the Fermi level difference between Bi 7 O 9 I 3 and TiO 2 and strengthening the interfacial BIEF. The enhanced BIEF promotes directional interfacial charge transfer and suppresses photogenerated carrier recombination, leading to improved charge separation. Consequently, the optimized photocatalyst achieves an NH 3 production rate of 53.70 μmol g −1 h −1 in pure water, which is 8.21- and 3.76-fold higher than those of pristine Bi 7 O 9 I 3 and the undoped Bi 7 O 9 I 3 /TiO 2 heterojunction, respectively. In situ FT-IR spectroscopy and theoretical calculations indicate that the photocatalytic nitrogen reduction proceeds through an associative distal pathway. This work demonstrates that dopant-induced Fermi level engineering can effectively regulate interfacial electric fields and charge transfer behavior in S-scheme heterojunctions, providing a rational strategy for BIEF engineering in efficient photocatalytic nitrogen fixation. Download: Download high-res image (166KB) Download: Download full-size image
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JOURNAL OF ALLOYS AND COMPOUNDS
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2026
·
IF 6.7
Yujie Sun,Daijie Deng,Chaozhong Guo,Rong Hu,Yimin Chen,Huiyan Cao,Zhiyuan Cui,Rong Jin,Yao Liu,Yujun Si,Quan Xu
The development of highly active and durable oxygen reduction reaction (ORR) electrocatalysts is crucial for the advancement of zinc-air batteries. A dual-ligand stepwise preordination strategy is employed to synthesize the Fe–Ce bimetallic carbon-based catalyst (Ce/Fe–NC) with abundant Fe–N x /Ce–N x sites and Fe 3 O 4 , and a hierarchical micropore-mesopore structure. The introduction of Ce-related species significantly modulates the electronic structure of Fe sites, which is consistent with possible d–f orbital hybridization and d -band center regulation of Fe. Such electronic effect reduces the ORR energy barrier and endows Ce/Fe–NC with a half-wave potential of 0.875 V. The prepared CeO 2 with a fast Ce 3 + /Ce 4+ redox couple efficiently scavenges reactive oxygen species to inhibit the degradation of Fe–Nₓ sites and Fe 3 O 4 species, as well as the corrosion of carbon skeleton caused by Fenton reaction byproducts, ultimately enhancing the stability of the Ce/Fe–NC. After 30,000 accelerated cycles, the half-wave potential of the Ce/Fe–NC only decreases by 15 mV, and maintains a 95.4% current retention rate over 10,000 s. The zinc-air battery with Ce/Fe–NC achieves a peak power density of 230 mW cm −2 , a specific energy of 870.5 Wh kg –1 (Zn) , and a stable charge-discharge voltage gap over 100 h of cycling. This work provides a novel strategy for the preparation of high-performance non-precious metal ORR catalysts.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Kun Lang,Yuanyingxue Gao,Panzhe Qiao,Mingyang Liu,Xiaoxin Zou,Huiyuan Meng,Wei Wu,Baojiang Jiang
Precise Ce doping stabilizes LaMnO 3 nanoperovskites during high-temperature calcination. • Ce-induced V O pinning suppresses coarsening and builds a Mn 3+ –O–Mn 3+ /V O network. • LCMO achieves 9623 μg h −1 cm −2 NH 3 yield and 96.4% FE in a flow cell. • Low-cost LCMO scales to 78 g and converts municipal wastewater to ammonium fertilizer. Precise control of the geometry and electronic states of high-temperature perovskites is crucial for efficient electrocatalytic nitrite reduction (NO 2 RR) to remove NO 2 − pollutants and enable green ammonia synthesis. In this work, an A-site Ce substitution strategy is established to steer high-temperature crystallization through (V O ) pinning, enabling defect–lattice co-programming of Ce–LaMnO 3 (LCMO) with a nanoscale Mn 3+ -rich active network. Importantly, a synthesis-to-reactivity mechanism is elucidated for high-temperature perovskite NO 2 RR catalysts, where V O pinning suppresses sintering-driven agglomeration while concurrent e g state activation mitigates electronically sluggish Mn sites. Density functional theory further shows that the formation of Mn 3+ −O−Mn 3+ network in conjunction with V O lowers the free-energy demand of key hydrogenation steps and accelerates NO 2 RR kinetics. In the flow cell, the optimized LCMO catalyst delivers an ammonia yield rate of 9623 μg h −1 cm −2 with Faradaic efficiency of 96.4%, ranking it among the most efficient catalysts reported for NO 2 RR. Notably, LCMO is scalable to 78 g per batch without detectable structural change and at a low estimated cost of ca. 1.5 USD g −1 , highlighting its industrial relevance. In a solar-powered system, it directly converts real municipal wastewater into ammonium fertilizer with an (NH 4 ) 2 SO 4 concentration of 1.8 g L −1 , establishing a scalable, solar-driven wastewater-to-fertilizer route for practical green ammonia stabilization. Download: Download high-res image (193KB) Download: Download full-size image Trace A site Ce in LaMnO 3 pins oxygen vacancies, blocks interparticle mass exchange, and locks smaller Mn 3+ -rich perovskite nanoparticles with a Mn 3+ –O–Mn 3+ /V O network that lowers NO 2 RR hydrogenation barriers. LCMO delivers 9623 μg h −1 cm −2 NH 3 at 96.4% FE at −0.8 V vs. RHE and in a flow converts wastewater into crystalline NH 4 F and (NH 4 ) 2 SO 4 .
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