JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2023
·Vol. 106
·期 11
·7088-7097
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IF 3.9
Shibing Zuo,Yang He,Yi You,Xiaoyan Shu,Mingfen Wen,Yuexiang Lu,Tao Duan,Jing Chen,Fen Luo,Faqin Dong,Xirui Lu
To extend the practicability of ceramics in immobilizing nuclear waste with fluctuant composition, structural design should be abandoned. The simulated tetravalent actinide waste An 4+ (Ce 4+ ) was directly doped into prepared Gd 2 Zr 2 O 7 , and the waste forms were synthesized by high-temperature solid-state reaction. It has been shown that the maximum loading of CeO 2 in Gd 2 Zr 2 O 7 lies between 20 and 30 wt.%, and Ce elements are uniformly distributed in the matrix. Existing in Ce 3+ and Ce 4+ , cerium ions automatically occupied both the Gd and Zr sites in Gd 2 Zr 2 O 7 according to valence equilibrium. This occupation causes the change of r (A 3+ )/ r (B 4+ ) and eventually leads to the structure transition from pyrochlore to fluorite. In addition, the normalized leaching rate of the sample with 60 wt.% of dopant was about 2.5 × 10 −7 g m −2 d −1 on the 35th day. In this study, a free occupation of simulated waste ions in ceramics was proposed.
研究领域:
材料科学
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核废物管理
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DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 46
·18819-18828
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IF 5.7
Jinyang Li,Wenye Deng,Yan Xue,Ni Ai,Kai Ding,Xianghui Chen,Weiwei Meng,Pengjun Zhao,Aimin Chang,Yongxin Xie
The hexagonal perovskite oxide Ba7Nb4MoO20 is widely studied in chemical devices due to its oxide-ionic conductivity at high temperatures. Ce4+ doping into Ba7Nb4MoO20 was undertaken to optimize small polariton conduction and oxide ionic conductivity simultaneously. Ba7Nb4−xCexMoO20 materials were synthesized via solid phase sintering. XRD patterns indicate a single phase, SEM scans reveal increased densification with higher Ce doping concentrations, and the resistance temperature range expands from 400–900 °C to 300–1100 °C. Hall tests confirm that Ba7Nb4−xCexMoO20 carriers are electrons, indicating n-type conductivity. Nyquist plots illustrate that grain boundary resistance governs complex impedance, which shows gradual oxide ionic conductivity enhancement with rising temperature. The aging drift rate decreases to about 1%, suggesting good stability of Ba7Nb4−xCexMoO20 ceramics. These findings propose a feasible doping strategy for enhancing hexagonal perovskite oxide ceramics.
研究领域:
材料科学
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电化学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 44
·期 3
·797-806
·
IF 3.069
Xu Chu,Shengnan Wang,Yan Cao
Graphene quantum dots (GQDs) have been widely applied in the fields of photocatalysis, bioimaging, drug delivery, metal ion detection and up-conversion photoluminescence, etc. This work introduces N-doped graphene quantum dots (N-GQDs), prepared via a one-step green wet chemical method using graphene oxide (GO) as a raw material, followed by dialysis, to create a new fluorescence sensor for rare earth elements (REEs). The obtained N-GQDs with rich oxygen functional groups showed a strong blue emission which was almost unaffected by extreme pH conditions. Due to the selective coordination to Ce4+ over other REEs, the N-GQDs can be used as a sensitive and selective chemo-sensor of Ce4+ ions in aqueous solution. The concentration range and the detection limit of the N-GQDs fluorescence probe were 1–44 μM and 0.8352 μM for Ce4+, respectively. The possible quenching mechanism was also explored via material characterization tools, such as FTIR, XPS, UV-vis and DLS analysis. The interference from other REEs was negligible during the quantitative determination of Ce4+. This method proved to be simple, sensitive, low cost, and also reliable for practical applications.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2015
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IF 2.947
Yi Ding,Xirui Lu,Hong Tu,Xiaoyan Shu,Hui Dan,Shuai Zhang,Tao Duan
A series compositions with general stoichiometry as Zr 1− x − y (Nd x Ce y )SiO 4− x /2 (0 ≤ x , y ≤ 0.1) have been obtained by simultaneous substitution of Nd 3+ and Ce 4+ for Zr 4+ in ZrSiO 4 structure. The effects of Nd and Ce content on the phase evolution and microstructure of the ceramics were investigated systematically. The results show that the samples co-doped with total content of Nd 3+ ( x ) and Ce 4+ ( y ) < 0.04 are single zircon phase. However, when the compositions co-doped with total content of Nd 3+ ( x ) and Ce 4+ ( y ) ≥ 0.04 exhibit coexistence of zircon and (Nd,Ce) 2 Si 2 O 7 phase. This demonstrates that the solubility of Nd 3+ and Ce 4+ in zircon structure is around 0.04 mol per mol of zircon. In addition, it is found that the densities of the samples increase with increasing total content of Nd 3+ and Ce 4+ . These results indicate that zircon ceramics are promising candidate for the immobilization of trivalent and tetravalent actinides.
研究领域:
材料科学
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陶瓷
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核材料
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固体化学
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DOI
高影响因子
Science Bulletin
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2019
·
IF 6.277
Yang An,Yuanyuan Liu,Hongtao Bian,Zeyan Wang,Peng Wang,Zhaoke Zheng,Ying Dai,Myung-Hwan Whangbo,Baibiao Huang
UiO-67 is a Zr-based metal–organic framework (MOF) containing an organic linker namely, the dianion of biphenyl-4,4′-dicarboxylic acid (bpdc). Ce 4+ metal ions (0.02 Ce to Zr atom ratio) were incorporated into UiO-67 via partially replacing bpdc with the dianion of 2,2′-bipyridine-5,5′-dicarboxylic acid (bpydc); thus, the latter forms a bpydc-Ce complex. The resulting product (i.e., UiO-67-Ce) demonstrated a photocatalytic hydrogen evolution rate that was over 10 times higher than that of UiO-67. Through this modification, a new energy transfer channel is opened up. The energy transfer between the bpdc and bpydc-Ce ligands (i.e., from excited bpdc to bpydc-Ce) weakened the recombination of the charge carriers, which was confirmed by photoluminescence, emission lifetime, and transient absorption measurements. This study presents a new way to construct highly efficient MOF photocatalysts.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
·
IF 8.1
Qikai Ren,Shuaishuai Wang,Haoyu Liu,Xing Zhang,Yanran Cui,Gui-Rong Zhang,Lei Nie,Donghai Mei
The dry reforming of methane (DRM) serves as a pivotal reaction for hydrogen generation and the simultaneous conversion of methane and carbon dioxide, two major greenhouse gases, into syngas that can further be converted into high-value fuels and chemicals. However, catalyst deactivation imposes a major challenge that prohibits the market penetration of DRM. Here we reported a series of bifunctional Ni-Ce catalysts supported on SSZ-13 (Ni-Ce-SSZ-13) and discovered that a small amount of Ce could significantly enhance the activity, selectivity, and stability for DRM. Optimal ratio of Ni to Ce has been identified to yield peak catalytic performance. The optimal performance is correlated with the maximum Ce 3+ /Ce 4+ ratio as revealed by XPS analysis, which implies an increased presence of oxygen vacancies in the catalysts. It played a crucial role in facilitating the oxidation of activated CH 4 species at Ni sites, thereby enhancing DRM activity and diminishing the detrimental coke formation. It is also disclosed that integrating proper amount of Ce fosters its interactions with Ni, effectively preventing the agglomeration of Ni sites. This work presents great implications for the rational design and catalytic synergy of bi-/multi-functional zeolite catalysts for other technological applications.
研究领域:
化学工程
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催化科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jianying Wang,Xu Luo,Tongzhou Li,Jingchen Na,Wanxiu Pang,Hongjie Zhang,Jinkai Hao,Zhigang Shao
Developing efficient and stable single-atom catalysts (SACs) for acidic oxygen evolution reaction (OER) offers a promising direction toward achieving economical and sustainable development of proton exchange membrane water electrolysis (PEMWE). However, their widespread application remains hindered by intrinsic stability challenges. Herein, we engineered an m-Ir SA -CeO 2 catalyst featuring an Ir-O-Ce 4-δ (0 < δ <1) coordination that delivered exceptional efficiency and stability in PEMWE. In this configuration, low-valent Ce species stabilized high-valent Ir active sites through lattice charge compensation, significantly enhancing catalyst activity and durability. X-ray photoelectron spectroscopy, X-ray absorption fine structure spectroscopy, and theoretical calculations revealed electron transfer from Ir to Ce through the Ir-O-Ce 4-δ coordination, which optimized oxygen intermediate adsorption in the adsorbate evolution mechanism and reduced the ionic character of Ir O bonds to boost intrinsic activity and structural stability. The m-Ir SA -CeO 2 achieved a 267 mV overpotential with >500 h stability at 10 mA cm −2 in 0.1 M HClO 4 . Furthermore, the PEMWE electrolyzer employing the m-Ir SA -CeO 2 anode catalyst maintained stable operation at 100 mA cm −2 for >1000 h with an ultralow Ir loading of 0.12 mg cm −2 .
研究领域:
电催化
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能源材料
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可持续能源
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纳米催化
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2026
·
IF 8.3
Pengcheng Yan,Xingwang Zhang,Yu Zhang,Pengfei Zheng,Guanyu Wu,Xiaojie She,Zhao Mo,Jintao Dong,Keqiang Xu,Henan Li
Given the health risks posed by profenofos (PFF) pesticide residues in aquatic environments, photoelectrochemical (PEC) aptasensors provide a viable solution for efficient detection, with accelerated photoelectrode interfacial carrier migration being critical for high-sensitivity sensing. A variable-valence Ce 3+ /Ce 4+ ionic bridge-modified carbon nitride (CN) material was engineered for PEC aptasensing applications. As a rare-earth species, Ce 3+ /Ce 4+ features incompletely filled 4 f and unoccupied 5d orbitals, which induce electron trap states in the CN matrix. These states restructure CN’s band configuration, narrow its band gap, and enhance photogenerated charge carrier generation. Moreover, Ce 3+ /Ce 4+ ionic bridge serves as an efficient electron transport medium, boosting charge migration and diffusion across the CN surface, thus elevating the material’s overall PEC performance. The resulting Ce 3+ /Ce 4+ /CN-based PEC aptasensor achieved sensitive PFF detection, with a linear range of 1–30000 fM and a detection limit of 0.33 fM (S/N = 3). It also exhibited strong selectivity, stability, reproducibility, and a low relative standard deviation (RSD=4.89% < 5%). This strategy enables effective aquatic PFF residue determination, while the valence-reversible ion-doped CN holds promise for broader rapid PEC analysis of organophosphorus pesticides.
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DOI
高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2018
·
IF 2.447
Shuyang Li,Xiaoyong Yang,Jian Liu,Xiaofeng Zhao,Shahid Hussain,Yi Ding,Yong Yi,Tao Duan
Using Ce atom as the surrogate for tetravalence actinides, the structure stability, chemical bonding and solubility of Zr 1- x Ce x SiO 4 have been investigated by combing first principles calculations and static leach test (MCC-1) experimentally to understand the effect of actinides on stability of ZrSiO 4 . The structural analysis indicates that the high symmetry of [CeO 8 ] polyhedron could well maintain the structural stability of Zr 1- x Ce x SiO 4 . However, due to the longer and weaker Ce O bond than Zr O bond, LR Ce is slightly higher than LR Zr . Besides, the LR Zr and LR Ce are highest in acid leaching solution , followed in alkaline leaching solution and deionized water system. Worth noted, the negative solution energy of −22.254 eV indicates the pre-existing Zr vacancy is energetically favorite to accommodate actinides surrogate Ce impurities or quadrivalent actinides with slight structural deformation, showing the strong structural and chemical stabilities of ZrSiO 4 .
研究领域:
材料科学
·
核化学与放射化学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Haoran Yin,Linyu Chen,Linlin Huang,Tayirjan Taylor Isimjan,Dandan Cai,Xiulin Yang
Ce 3+ /Ce 4+ redox drives stable β-NiOOH formation in NiCe NDC. • Ce 4f reservoirs tune Ni d-band center, lowering OER barrier. • NiCe NDC/CP exhibits good OER activity and long-term stability. • 20 MW electrolyzer assessment predicts H₂ cost ∼USD 5.40 kg −1 . The rational regulation of electrochemical reconstruction is a promising route to high-performance oxygen evolution reaction (OER) electrocatalysts, yet the underlying electronic mechanisms and their technological relevance remain elusive. Herein, a Ce-doped Ni-based metal organic framework (NiCe NDC) precatalyst is fabricated via a facile one-step solvothermal method. The reversible Ce 3+ /Ce 4+ redox pair acts as a dynamic electron-buffering center, and the strong Ni 3d–O 2p–Ce 4f orbital coupling induces controllable reconstruction into stable β-NiOOH, while inhibiting the over-oxidation and structural deterioration of active phases. In situ Raman spectroscopy and X-ray photoelectron spectroscopy verify the optimized reconstruction kinetics and reversible Ce valence evolution, while density functional theory (DFT) calculations confirm that near-Fermi-level Ce 4f states serve as electron reservoirs to modulate the Ni d-band center, enrich electronic density at the Fermi level, and reduce the free-energy barrier of the rate-determining *O to *OOH step. Optimized NiCe NDC delivers superior alkaline OER performance with a low overpotential of 194 mV at 10 mA cm −2 , a small Tafel slope of 61.8 mV dec −1 , and long-term stability over 100 h at 100 mA cm −2 . Coupled with a Pt/C cathode, the assembled overall water-splitting electrolyzer achieves current densities of 10–1000 mA cm −1 under low cell voltages of 1.42–1.90 V. A techno-economic assessment (TEA) of a 20 MW alkaline electrolyzer estimates a levelized cost of hydrogen (LCOH) of ∼USD 5.40 kg −1 H₂. This work reveals the electronic mechanism of rare-earth-regulated reconstruction and provides a feasible strategy for designing advanced OER catalysts toward industrial green hydrogen production. A rare-earth doped Ni-based MOF pre-catalyst is rationally developed for efficient alkaline OER, where Ce dopant with reversible Ce 3+ /Ce 4+ redox property acts as a dynamic electron pump to regulate the electrochemical reconstruction process and stabilize the derived active NiCeOOH phase. Enabled by this electronic modulation strategy, the resulting catalyst exhibits outstanding OER performance with an ultralow overpotential of 194 mV at 10 mA cm −2 , coupled with robust long-term durability over 100 h at a large current density of 100 mA cm −2 . Download: Download high-res image (109KB) Download: Download full-size image
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高影响因子
JOURNAL OF RARE EARTHS
·
2024
·
IF 5.2
Ying Li,Jiaqi Ou,Shuangqiang Fang,Jiali Yu,He Lin,Haoliang Cheng,Xiulan Shui,Renjie Xu,Zhijie Ye,Le Wang
Due to the wide and adjustable emission range, Ce 3+ is an indispensable luminous center for full spectrum lighting. However, it needs to be sintered at high temperature in a reducing atmosphere, resulting in difficulty to coexisting with other multivalent activated ions (such as Eu 3+ , Tm 3+ ), which greatly hinders the formation of full spectrum. In this study, a calcium vacancy enhanced self-reduction of Ce 4+ is realized in CaNaSb 2 O 6 F (CNSOF) host under air atmosphere sintering, through which Ce 3+ , Tm 3+ and Eu 3+ coexisting in a single-phase full spectrum phosphor was prepared. Notably, the artificial introduction of a calcium vacancy was designed to verify this self-reduction mechanism. Moreover, the energy transfer kinetics among Tm 3+ , Ce 3+ and Eu 3+ were explored. Finally, combined with a 340 nm UV chip, a full spectrum phosphor-converted light-emitting diode (pc-LED) was fabricated, showing a broad emission range from 400 to 750 nm, Commission Internationale de I’Eclairage (CIE) of (0.3485, 0.3673), Ra of 92 and correlated color temperature (CCT) of 4933 K. Utilizing the variation in emission colors of this phosphor under different UV wavelengths, a dual encryption method combining point character code and fluorescent encryption technique is proposed. This work provides an effective path for Ce 4+ self-reduction to apply in full spectrum pc-LED and information encryption.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Pengsen Zhao,Haizhong Zheng,Guifa Li,Yongxiang Geng,Yixin Xiao,Hongbo Guo,Ping Peng
The CaO–MgO–Al 2 O 3 –SiO 2 (CMAS) corrosion resistance of La 3+ -Yb 3+ -Ce 4+ co-doped ZrO 2 (LYZC) ceramic was systematically discussed via experiment and first-principles calculation. Results demonstrate that at the CMAS/RE-ZrO 2 interface, RE is dissolved in molten CMAS to form some RE-apatite particles, which effectively inhibits CMAS penetration. Compared with La 3+ doped ZrO 2 (LZ), LYZC owns a better ability to maintain the coating microstructure under CMAS corroded, which is conducive to alleviating CMAS penetration. This conclusion is also confirmed by the low diffusion coefficients ( D ) of RE and Zr in CMAS/LYZC(111), which are only 2.305–5.556 × 10 −8 m/s and 2.694–3.421 × 10 −8 m/s, respectively. Furthermore, the small electrostatic potential difference (Δ V = 1.578–1.654 eV) of the CMAS/LYZC(111) terminal layer suggests that molten CMAS does not easily adhere to the LYZC surface.
研究领域:
材料科学
·
理论计算
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）