Chemistry-An Asian Journal
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2019
·Vol. 14
·期 16
·2815-2821
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IF 3.698
Wei Li,Shuang Wang,Jinping Li
Graphical Be well supported ! Two BaCeO 3 supports with strong basic sites were synthesized by a co-precipitation route under different calcination temperatures. BaCeO 3 -a has a high basic density and Ru/BaCeO 3 -a has more oxygen vacancies, which are beneficial for the dissociation of N 2 . Therefore, the 1.25 % Ru/BaCeO 3 -a catalyst exhibits superior performance in ammonia synthesis (see figure). BaCeO 3 -a and BaCeO 3 -b, with strong basic sites, were synthesized by using a co-precipitation method at different calcination temperatures, and used as supports to evaluate their performance in ammonia synthesis. The ammonia synthesis rate with the 1.25 % Ru/BaCeO 3 -a catalyst is 24 mmol g −1 h −1 , which is higher than that of 1.25 % Ru/BaCeO 3 -b catalyst (18 mmol g −1 h −1 ) at 3 MPa and 450 °C. Moreover, the performance of the 4 % Cs-1.25 % Ru/BaCeO 3 -a catalyst was further improved to 28 mmol g −1 h −1 , and no sign of deactivation was observed after a reaction time of 120 h. The XPS and H 2 temperature-programmed reduction analyses indicated that the Ru/BaCeO 3 -a catalyst has more oxygen vacancies than the Ru/BaCeO 3 -b catalyst. In addition, the average Ru particle size of the Ru/BaCeO 3 -a catalyst is closer to 2 nm than the Ru/BaCeO 3 -b catalyst, which promotes the generation of B 5 -type sites (the active site for N 2 dissociation). The CO 2 temperature-programmed desorption analysis indicates that BaCeO 3 -a has a high basic density, which is beneficial for electron transfer to Ru and further facilitates the dissociation of N≡N bonds.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2016
·
IF 3.205
Yushan Hou,Jianfang Wu,Elena Yu. Konysheva
Quantitative analysis of Cr-adsorption from a gas phase on CeO 2 , pure and doped BaCeO 3 was performed in combination with surface techniques and electrochemical impedance spectroscopy . The Cr-adsorption on BaCeO 3 is 3 times higher than on CeO 2 and it increases by 12–25% on In doping in Ba(Ce 1−x In x )O 3 (x = 0.1–0.3) in the temperature range of 600–700 °C. These perovskites adsorb chromium with the formation of a multi-phase surface layer containing BaCr 6+ O 4 and cerium oxide. Coexistence of small fractions of Cr 3+ and Cr 5+ cations in the surface layer was identified by X-ray photoelectron spectroscopy. The thickness of the surface layer and its morphology vary with temperature, affecting the conductivity of Ce containing perovskites below 700 °C. BaCrO 4 exhibits under air noticeably larger anisotropic thermal expansion than BaCeO 3 . The results indicate that high tolerance to Cr-gaseous species should be considered as an important criterion for further development of materials for proton-conducting SOFCs.
研究领域:
材料科学
·
电化学
✓ 已验证
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DOI
高影响因子
JOURNAL OF RARE EARTHS
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2020
·
IF 3.104
Wei Li,Shuang Wang,Jinping Li
A series of BaCeO 3 modified with different rare earth elements (La, Y, Pr) were synthesized by co-precipitation and calcination and the effect of rare earth elements for catalytic ammonia synthesis under mild conditions was studied. The ammonia synthesis performance tests show that 2.5% Ru/BaCe 0.9 La 0.1 O 3– δ catalyst (All the percentages of Ru in this article are in mass fraction) exhibits the highest ammonia synthesis rate (34 mmol/(g·h)) at 3 MPa, 450 °C, and no sign of deactivation after 100 h of reaction. H 2 -TPR and XPS analyses indicate that the introduction of La increases the amount of oxygen vacancies of the catalyst, which is beneficial to increasing the electron density of Ru surface. HRTEM analysis shows that the Ru particle size is reduced greatly after La is introduced, which facilitates the catalyst generating more B 5 -type sites (active sites of Ru species for N N dissociation). CO 2 -TPD analysis indicates that BaCe 0.9 La 0.1 O 3– δ has stronger basicity , which promotes electrons transfer from support to Ru. This work provides an effective method for design and synthesis of Ru-based multi-element composite perovskite oxide catalysts.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
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2019
·
IF 4.507
Huiying Wang,Zhenning Yang,Jie Liu,Guozhu Li,Xiangwen Zhang
Coking during endothermic hydrocarbon fuel cracking is a key problem that has to be considered. In this study, anti-coking effect was systematically studied by using water, ethanol and HPW as additives on the coatings of CsOH and BaCeO 3 during RP-3 cracking. The morphology, type and amount of coke deposits on the coatings were characterized by means of scanning electron microscopy (SEM), temperature programmed oxidation (TPO) and quantitative carbonization method, respectively. The results show that either the additive or the catalytic coating can effectively remove the coke deposits on the reaction tube. Remarkably, BaCeO 3 coating is more effective in inhibiting the formation of fiber coke compared with CsOH coating，which is conducive to the cracking reaction. The best anti-coking effect is achieved by using 5 wt% ethanol as additive on the BaCeO 3 /HPW coating, and the inhibiting percentage is 97%. In addition, a possible anti-coking mechanism of carbon-steam gasification through BaCeO 3 /HPW coating and ethanol has been proposed.
研究领域:
化学工程
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能源科学
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产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Shuangting Jiang,Xinxin Shu,Xiaozhong Zheng,Mingxuan Dai,Ranran Peng,Zhongliang Zhan,Mingxia Gao,Hongge Pan,Wenping Sun
Proton-conducting ceramic cells (PCCs) with BaCeO 3 -based electrolytes have emerged as promising energy conversion devices for low/intermediate-temperature applications, and their performance critically depends on the microstructure of the composite hydrogen electrodes. However, the atomic-level characterization and understanding of the interfacial interactions within the hydrogen electrode are still lacking. Herein, the atomic-scale investigation of the high-temperature element diffusion behavior and interface evolution between NiO and BaZr 0.1 Ce 0.7 Y 0.2 O 3-δ （BZCY）is presented. The interdiffusion of Ni and Ba elements at the NiO/BZCY interface leads to the formation of a BaNiO x phase, and the interdiffusion extent is intensified with increasing the sintering temperature and time. The formation of BaNiO x , along with Ba loss-induced stoichiometric deviation and Y 2 O 3 precipitation, impairs proton conduction in the hydrogen electrode and across the electrode/electrolyte interface. The results highlight the significance of atomic-level interface modulation of the cermet hydrogen electrode, and a low-temperature fabrication process is vital to improving the cell performance.
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Zhiyong Yang,Guofang Zhang,Ruiqin Zhang,Lu Bai,Jianyi Xu,Ping Yuan,Lingliang Kong,Jingyi Zhang,Juan Du
The development of nickel-metal hydride battery anodes has long been limited by the inherent capacity decay of the anodes of the metal alloy materials. In this study, the BaCe 1-x Li x O 3 solid solutions with controlled contents of Li + ions (x = 0–0.8) were synthesized via combustion method and adopted them as the novel negative materials to offer a breakthrough in overcoming traditional performance constraints. The influences of Li + contents on microstructure and electrochemical hydrogen storage performance were systematically investigated. X-ray Diffraction test (XRD) confirmed that the Li + ions were successfully incorporated into the BaCeO 3 lattice and substituted at the Ce 4+ sites. The grain sizes were gradually decreased from 73.5 nm (undoped) to 67.0 nm (Li 0.08 ). Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM) results further supported the reduction of the grain sizes and proved that the Li + ions had doped into the lattice of the BaCeO 3 . Spectral tests showed that the Li + ions induced obvious changes in the lattice structures and the concentration of oxygen vacancies. Electrochemical hydrogen storage performance tests demonstrated that the discharge capacity of BaCe 0.96 Li 0.04 O 3 achieved 212.7 mAh/g, representing 95.1 % improvement over the undoped sample (109.0 mAh/g), along with higher charge retention. Kinetic analysis further confirmed the superior hydrogen storage kinetic behavior of the doped samples. These results fully proved that the doping of Li + ions can effectively enhance the hydrogen storage performances of BaCeO 3 materials.
研究领域:
材料科学
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电化学
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储能技术
·
固体化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2025
·
IF 7.9
Zhiyong Yang,Guofang Zhang,Ruiqin Zhang,Lu Bai,Shilong Sun,Yiming Li,Zhuocheng Liu,Feng Hu,Jianyi Xu,Ruihua Guo,Yanghuan Zhang
The BaCe 0.98 M 0.02 O 3 (M = Ce, Y, Li, Mn, Ni) solid solution was successfully synthesized via a combustion method. The microstructure and spectra characteristics were analyzed systemically. The X-ray diffraction (XRD) results showed that the structures of the BaCeO 3 -based materials kept cubic perovskite single-phase structure. The findings from the Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analyses revealed that the doped samples exhibited smaller grain sizes and the doped elements are distributed uniformly. The spectral analyses revealed that the doped samples contain higher contents of oxygen vacancies in the lattices. The electrochemical hydrogen storage characteristics of the samples demonstrated that the doped samples possess greater discharge capacities compared to pure BaCeO 3 . The Y-doped sample demonstrated superior electrochemical performance, delivering a remarkable specific capacity of 377 mA h/g (hydrogen content of 4.56 %) with excellent capacity retention of 371 mA h/g after 50 cycles. Moreover, the incorporation of Y ions not only significantly enhanced the rate capability but also effectively suppressed the self-discharge behavior. The hydrogen storage mechanism was speculated. The characteristics of hydrogen storage are significantly influenced by the lattice parameters, the concentration of oxygen vacancies and defects, as well as the nature of the doped ions.
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DOI
高影响因子
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