JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Sharafat Ali,Haider Ali,Syedul Hasnain Bakhtiar,Sajjad Ali,Muhammad Zahid,Ahmed Ismail,Pir Muhammad Ismail,Amir Zada,Imran Khan,Huahai Shen,Rizwan Ullah,Habib Khan,Mohamed Bououdina,Xiaoqiang Wu,Fazal Raziq,Liang Qiao
The construction of extremely dispersed redox-heterojunctions is a critical step toward improving of photocatalytic activity. Nonetheless, electron transfer faces momentous hurdles at the interfaces of these redox-heterojunction, mainly as a result of the considerable gap and potential-barrier between them. To address this obstacle, a bifunctional phosphate was deliberately introduced as an electron-bridge into the Cu 2 O/CeO 2 redox-heterojunction system, aiming to necessitate a potential-barrier, establish a photoelectron transport route to improve the surface catalysis, and serve as a catalyst stabilizer , leading to improved dispersion of Cu 2 O on the CeO 2 surface. The resultant intricately dispersed and optimized redox-heterojunction showcased an unparalleled advancement in apparent quantum efficiency (AQE), attaining an approximate value of 1.41 % at 420 nm during the photocatalytic CO 2 reduction. The experimental findings established a conspicuous association between the substantial increase in AQE and the diminished interfacial migration resistance, heightened dispersion, and abundance of more active-sites, all accredited to phosphate-modulation in the redox-heterojunction. The work emphasizes the significant importance of phosphate in bridging the conduction and valence bands of semiconductors, leading to enhanced photocarrier separation efficiency and improved molecular dispersion.
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CHEMISTRY OF MATERIALS
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2018
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IF 9.89
Yali Liu,Pengfei Zhang,Junmin Liu,Tao Wang,Qisheng Huo,Li Yang,Lei Sun,Zhen-An Qiao,Sheng Dai
Gold clusters with ultrasmall size and special structure are highly attractive for heterogeneous catalysis. However, stabilizing gold clusters under thermal treatment remains a major hurdle on the way toward real-world application. Herein, we report an effective approach that stabilizing gold clusters (Au25 and Au144) within mesoporous ceria nanospheres via a two phase overcoating process. High-resolution aberration-corrected STEM studies indicated that gold clusters were encapsulated and confined in the intersectional channels of ceria, and the encapsulated clusters were demonstrated to be resistant to sintering under high-temperature thermal treatment. The solvent-free aerobic oxidation of toluene and ethylbenzene was carried out to illustrate the performance of gold clusters in catalysis, and these materials showed excellent catalytic activities and afforded much higher turnover frequencies (up to 5634 and 55 027 turnovers for toluene and ethylbenzene oxidation), which are, as far as we know, much higher than the values of state-of-art catalysts. Density functional theory calculations revealed that the encapsulated gold clusters effectively reduced the energy required for the dissociation of O2 molecules, leading to the excellent catalytic activity.
研究领域:
材料科学
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催化化学
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CATALYSIS COMMUNICATIONS
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2019
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IF 3.674
Cuncun Zuo,Yun Tian,Yanxia Zheng,Lei Wang,Zhongjun Fu,Tiantian Jiao,Ming Wang,Haofei Huang,Yuchao Li
Series of gold and ceria supported γ-Al 2 O 3 catalysts were developed for the oxidative esterification of methacrolein with methanol. All the catalysts were prepared through one step deposition-precipitation method, and K 2 CO 3 and urea were used as precipitant, respectively. Au, CeO 2 and γ-Al 2 O 3 could self-assemble unique particle morphology during co-precipitation process and form semi-core shell or core shell structure after calcination . The relationship between catalytic reactivity and structural characteristics were analyzed by SEM, TEM, EDS, BET, XRD, XPS, etc. Among Au-CeO 2 /γ-Al 2 O 3 (K 2 CO 3 ), Au-Ce/γ-Al 2 O 3 (Urea) and Au/γ-Al 2 O 3 (Urea) catalysts with different active components and precipitant, the last two exhibited higher catalytic activity. Moreover, the Ce-doped catalysts shown higher stability than just Au supported on pure alumina. The active stability of the optimum Au-Ce/γ-Al 2 O 3 catalyst was evaluated with seven-time cyclic reactions exhibiting high stability and activity with the yield of MMA above 90%.
研究领域:
催化化学
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材料科学
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Journal of the Taiwan Institute of Chemical Engineers
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2019
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IF 3.834
Jingru Guan,Huiqin Wang,Jinze Li,Changchang Ma,Pengwei Huo
A series of novel porous indium (III) oxide (In 2 O 3 ) and nanocubic cerium oxide (CeO 2 ) loading HCl treated attapulgite (HATP) ternary photocatalysts were successfully synthesized. Simultaneously, all photocatalysts were performed the CO 2 reduction under UV-light. To explore the crystal structures, morphologies and electrochemical characteristics of as-synthesized samples, the XRD, SEM and TEM, and transient photocurrent techniques were performed in this work. Besides, as an optimized In 2 O 3 /CeO 2 /HATP sample presents the highest activity for CO (32.03 µmol/g) and CH 4 (16.94 µmol/g) yields, which is 6.11-fold and 6.78-fold times higher than those of pure CeO 2 under UV-light (8 W) irradiation.
研究领域:
材料科学
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环境科学
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ACS Applied Materials & Interfaces
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2020
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IF 8.758
Liu Pi,Rui Jiang,Wanxin Cai,Lei Wang,Yangyang Wang,Jianhua Cai,Xuhui Mao
This study reports the superior performance of novel carbonaceous materials, CeO2-encapsulated nitrogen-doped biochars [BC-Ce-X (X = 1 and 2)], for oxygen reduction reaction (ORR). The biomass precursor of this value-added biochar material was biomimetically prepared via a hydroponic operation in the Ce-enriched solution. The characterization results showed that CeO2 with large amounts of oxygen vacancies was stably embedded in the N self-doped biochars during the pyrolytic processes. The measured specific surface areas of cerium-free biochar (BC sample), BC-Ce-1, and BC-Ce-2 were 79, 566, and 518 m2/g, respectively. The BC-Ce-X (X = 1 and 2) showed excellent ORR performances with onset potentials of ∼0.90–0.91 V, which outperformed the commercial 10 wt % Pt/C and BC. Compared with Pt/C, the BC-Ce-2 had better methanol tolerance and stability. Also, BC-Ce-2 displayed excellent electrochemical activity for Zn/air batteries. Controlled experiments and density functional theoretical calculations illustrated the synergistic effect between the pyri-N/C centers and CeO2 with oxygen vacancies in ORR. The Lewis base sites, created by pyri-N and oxygen vacancies, greatly facilitated the chemisorption of O2 molecules.
研究领域:
材料科学
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电化学
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JOURNAL OF MATERIALS RESEARCH
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2022
·Vol. 37
·期 5
·1070-1082
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IF 2.909
Wang Bo-Yuan,Li En-Di,Zong Yi-Chao,Wang Xiao-Bo,Yuan Jun,Zhang Fu-Qing
A well-defined structure is greatly helpful to enhance the performance of photocatalysis. Herein, we plan to fabricate multi-shell CeO 2 photocatalyst with hollow structure characters for enhanced photodegradation RhB efficiency. The SEM showed that the samples were the regular micro-spheres with a diameter of 1.5–2 μm, and the TEM image displayed these microspheres having multi-shell hollow structures with core–shell morphology. The RhB was degraded (83%) under visible light irradiation within 150 min. This multi-shell hollow CeO 2 (MSH-CeO 2 ) has a larger surface area and more oxygen vacancies (OVs), the catalytic performance is mainly improved by enhancing the light absorption properties and facilitating the separation efficiency of the electron-holes. This work introduces the effecting of morphology on the performance of the catalyst, which will provide a new idea for the construction of efficient photocatalysts. Graphical abstract
研究领域:
材料科学
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环境科学
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ACS Omega
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2021
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IF 3.512
Ting Liang,Biao Wang,Zhenzhong Fan,Qingwang Liu
CeO2 was synthesized by the co-precipitation method on the Cu mesh substrate and modified the surface of CeO2@Cu mesh by stearic acid (SA). The superhydrophobic behavior was ascribed to the combination of hierarchical micro–nanostructure of CeO2 and the hydrophobic alkyl groups from SA. The SA-CeO2@Cu mesh had antiacid and base stability and excellent durability as well as high separation efficiency. The separation efficiency can be up to 98.0% after separating 30 times.
研究领域:
材料科学
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环境工程
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高影响因子
Materials
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2023
·Vol. 16
·期 15
·5478
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IF 3.4
Yaohui Xu,Liangjuan Gao,Pingkeng Wu,Zhao Ding
A cubic fluorite-type CeO2with mesoporous multilayered morphology was synthesized by the solvothermal method followed by calcination in air, and its oxygen storage capacity (OSC) was quantified by the amount of O2consumption per gram of CeO2based on hydrogen temperature programmed reduction (H2–TPR) measurements. Doping CeO2with ytterbium (Yb) and nitrogen (N) ions proved to be an effective route to improving its OSC in this work. The OSC of undoped CeO2was 0.115 mmol O2/g and reached as high as 0.222 mmol O2/g upon the addition of 5 mol.% Yb(NO3)3∙5H2O, further enhanced to 0.274 mmol O2/g with the introduction of 20 mol.% triethanolamine. Both the introductions of Yb cations and N anions into the CeO2lattice were conducive to the formation of more non-stoichiometric oxygen vacancy (VO) defects and reducible–reoxidizable Cen+ions. To determine the structure performance relationships, the partial least squares method was employed to construct two linear functions for the doping level vs. lattice parameter and [VO] vs. OSC/SBET.Keywords:CeO2;doping;solvothermal;oxygen storage capacity;porous
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ACS Applied Nano Materials
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2023
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IF 5.9
Shuoshuo Yang,Hailing Li,Zhonghong Gao
As a critical factor in bone regeneration, oxidative stress affects the effectiveness of implantation seriously. Construction of bioactive coatings with ideal antioxidative and osteogenic activities is essential for the repair of bone injury. Here, inorganic cerium oxide nanoparticles (CeO2NPs) and organic baicalein (BAI)-modified bovine serum albumin (BSA) were used as assembly units to fabricate (CeO2NPs/BAI-BSA)4 coating via the layer-by-layer self-assembly technique. The drug-loaded CeO2NP coating obviously promoted cell adhesion and spreading of MC3T3-E1 cells in the early stage. Moreover, the CeO2NPs/BAI-BSA coating could scavenge both ABTS+• and DPPH• free radicals, and exhibited good antioxidative effect at the cellular level against the negative effect of oxidative stress. In addition, CeO2NP-based coatings exhibited good blood compatibility with low platelet adhesion and almost no damage to erythrocytes. The composite coatings of CeO2NPs and BAI-BSA have antioxidative, osteogenic, and blood-biocompatible properties, serving as a promising strategy for bone repair under oxidative stress.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Hongwang Liu,Yining Zhang,Sibao Liu,Sha Li,Guozhu Liu
Ammonia is a promising hydrogen storage material due to its ease of storage and decomposition to CO x -free hydrogen. Herein, we report colloidal solution combustion synthesis (CSCS) to construct Ni-CeO 2 nanocomposite catalysts for efficient ammonia decomposition to generate hydrogen. Unlike conventional supported Ni/CeO 2 catalyst, the prepared Ni-CeO 2 nanocomposite catalyst exhibited nickel embedded in CeO 2 matrix with enhanced metal-support interaction. The physicochemical properties and metal-support interaction of the catalysts can be tuned by adjusting the amount of silica sol template. The resulted Ni-CeO 2 nanocomposite catalysts exhibited outstanding catalytic performance in terms of activity and stability. The hydrogen production rate reached 32.9 mmol g cat −1 min −1 at 500 °C, which is superior to other state-of-the-art Ni-based catalysts and even comparable or better than some reported Ru-based catalysts. The systematic characterizations demonstrated that the unique Ni-CeO 2 nanocomposite structure with enhanced metal-support interaction, not only provided a rich Ni-CeO 2 interface to stabilize small-sized Ni nanoparticles, but also had a high concentration of oxygen vacancy to strengthen electronic metal-support interaction, making nickel surface electron-rich. The integrated studies of kinetics, temperature-programmed surface reaction, and DFT calculations corroborated that this enhanced metal-support interaction including geometric and electronic effects, favored the enrichment of NH 3 on the catalyst surface and facilitated rate-determining N≡N bond formation step, thereby boosting the reaction rate. This study highlights the importance of designing new structural catalysts with enhanced metal-support interaction for boosting hydrogen production from ammonia decomposition.
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INORGANIC CHEMISTRY
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2023
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IF 4.6
Shanshan Wu,Meng Tian,Yang Hu,Nan Zhang,Wei Shen,Jianyi Li,Linchuan Guo,Pengfei Da,Pinxian Xi,Chun-Hua Yan
Formate is identified as economically viable chemical fuel from electrochemical carbon dioxide reduction. However, the selectivity of current catalysts toward formate is limited by the competitive reaction such as HER. Herein, we propose a CeO2 modification strategy to improve the selectivity of catalysts for formate through tuning of the *OCHO intermediate, which is important for formate production.
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International Journal of Nanomedicine
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2023
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IF 8
Ying Zhang,Xiaowen Wu,Chenxi Hou,Kun Shang,Kui Yang,Zhimin Tian,Zhichao Pei,Yongquan Qu,Yuxin Pei
Objective The aim was to produce the first report of assembling degradable stimuli-responsive dithio-polydopamine coating with a cancer target unit for synergistic and targeted drug delivery.Methods A multifunctional drug delivery system was constructed by coating a dual-responsive dithio-polydopamine (PDS) on porous CeO2 nanorods and subsequent conjugation of lactose derivative, where the PDS was formed by self-polymerization of dithio-dopamine (DOPASS).Results The multifunctional drug delivery system displayed excellent cancer targeted ability resulting from the conjugation of lactose derivative, which could specifically recognize the overexpressed asialoglycoprotein receptors on the surface of HepG2 cells. It also showed a dual-responsive property of glutathione and pH, achieving controllable drug release from the cleavage of disulfide bond and subsequent degradation of PDS in cancer cells. Moreover, the degradation of PDS led to the exposure of CeO2 nanorods, which has a synergistic anticancer effect due to its cytotoxicity to cancer cells.Conclusion This work presents a good example of a rational design towards synergistic and targeted DDS for cancer chemotherapies.
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