ChemElectroChem
·
2022
·Vol. 9
·期 15
·e202200475
·
IF 4.782
Shu-Fang Li,Jie Zheng,Liang Hu,Yao Ma,Shuang Zhao,Chuan-Hui Zhu,Dong Yan
Graphical Substitute A-site : The effect of Sr-doping on the performance of double perovskite La 2 CoMnO 6 for catalyzing oxygen evolution reaction (OER) has been studied. The A-site partially substituted compounds, which were obtained via a facile sol-gel method, have proved to have better OER performances compared with La 2 CoMnO 6 . A higher content of oxygen vacancies together with the optimized e g orbit filling make contribution to the enhanced OER activity. Developing effective electrocatalysts for oxygen evolution reaction (OER) is crucial for exploring clean fuels. Owing to the flexible structure and unique 3d electron structure, perovskite has been considered as a promising candidate for OER electrocatalyst. Here, we report a range of A-site partially substituted perovskite obtained via a facile sol-gel method, La 2- x Sr x CoMnO 6 ( x =0.2, 0.4, 0.6, 0.8, and 1.0, LSCMO- x ). LSCMO- x has been proved to have better OER performances. Therein, LSCMO-0.8 shows the best OER catalytic performance among these A-site partially substituted perovskites. The OER overpotential of LSCMO-0.8 catalyst is 0.39 V, which is reduced by 80 mV compared to parent perovskite La 2 CoMnO 6 (LCMO, 0.47 V). The experimental studies have shown that LSCMO-0.8 exhibits a higher content of oxygen vacancies compared with LCMO, which may be the factor for the enhanced OER activity. Meanwhile, it is revealed that Sr doped in the A site can efficiently optimize the e g orbit filling. This work manifests that doping Sr into perovskites appropriately is an effective strategy for the improvement of OER activity.
研究领域:
材料科学
·
电化学
·
催化
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DOI
高影响因子
Sustainable Energy & Fuels
·
2021
·Vol. 5
·期 17
·4295-4310
·
IF 6.367
Ke Gao,Xianglei Liu,Tong Wang,Zhonghui Zhu,Ping Li,Hangbin Zheng,Chao Song,Yimin Xuan,Yongliang Li,Yulong Ding
Solar thermochemical CO2-to-fuel conversion via two-step redox cycles is a promising strategy to solve climate change and energy storage challenges simultaneously. However, ideal thermochemical materials possessing moderate operation temperature, high yield, good stability, and rapid kinetics operating under isothermal and near-isothermal conditions are still missing. Here, we propose Sr-doped SmMnO3 for moderate-temperature near-isothermal CO2-to-fuel conversions. A record-high isothermal cycle CO yield (376.1 μmol g−1) at no more than 1300 °C is reported based on Sm0.6Sr0.4MnO3. No obvious decay is observed during 14 cycles although grain sizes have increased to some extent. The weakened Mn–O bond induced by Sr doping helps to create more oxygen vacancies, and thus contributes to enhanced yield of both O2 and CO. The oxidation reaction is fast with a CO yield of 58.6 μmol g−1 in 15 minutes, which is 5.6 times as high as that of CeO2 under the same cycling conditions between 1300 °C and 1000 °C. Detailed kinetics for the oxidation step is unveiled based on the Šesták–Berggren model. In addition, SmxSr1−xMnO3 can capture full-spectrum solar energy with a solar absorptance of more than 86.6% in stark contrast to 13.5% for CeO2, making the required concentration ratio to drive reactions decrease by 33.4%. This work provides new materials for high yield and stable thermochemical CO2-to-fuel conversion under moderate-temperature near-isothermal conditions, and paves the way for the development of CO2 splitting techniques directly driven by low-concentration solar energy with high efficiencies.
研究领域:
材料科学
·
可再生能源
·
环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 33
·17417-17425
·
IF 7.443
Rui Tang,Longwei Yin
We present a novel Sr-doped TiO2/SrTiO3 nanorod array heterostructure for dye-sensitized solar cells (DSSCs) via a facile two-step hydrothermal process, with a tunable microstructure, optical response and photoelectrical conversion properties. The chemical composition components and microstructures of Sr-doped TiO2/SrTiO3 nanorod array heterostructures are investigated using XRD, XPS, SEM and TEM characterization techniques, respectively. It is shown that the treatment of rutile TiO2 nanorod arrays in Sr(NO3)2 solution results in the self-doping of Sr into the lattice of TiO2 and formation of Sr-doped TiO2/SrTiO3 nanorod array heterostructures, inducing a transition of optical response properties from the ultraviolet region to the visible region. The photogenerated electrons and holes can be effectively separated due to the formation of SrTiO3/Sr-doped TiO2 heterostructures with a uniquely matched band-gap energy structure, resulting in greatly enhanced photoelectric conversion efficiency performance. Electrochemical impedance spectroscopy and photoluminescence results show that the formation of Sr-doped TiO2/SrTiO3 heterostructures can effectively prolong the charge carrier lifetime. The dye loading capacity on the Sr-doped TiO2/SrTiO3 heterostructures can be improved through the functionalization bonding of the hydroxide group on the surface of the electrode material. DSSCs based on the optimized Sr-doped TiO2/SrTiO3 heterostructure photoanode achieve the highest energy conversion efficiency of 4.70% (one sun illumination), nearly 1.5 times higher than the bare rutile TiO2 photoanode (3.10%).
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Shuangqian Ma,Zhongyang Wang,Lan Yang,Danning He,Ming Yang,Liping Tong,Xiao Zhou,Tongxiang Fan
Ceramics with low solar absorptivity and high infrared emissivity play an important role in radiative cooling applications. BaTiO 3 , for instance, is one promising radiative cooling ceramic, although it has been mainly explored only in electronics. In this work, the solar-reflective and infrared-radiative properties of Sr-doped BaTiO 3 are studied systematically. Ba 1- x Sr x TiO 3 ( x = 0, 0.2, 0.25, 0.3, 0.35) ceramics synthesized by sol-gel method were investigated in terms of their microstructure, phase transition, and optical properties . Increasing infrared emissivity and solar absorptivity were observed with increasing Sr content. The optimized Ba 1- x Sr x TiO 3 achieves solar absorptivity of 0.17 and infrared emissivity of 0.78. The lowest absorptivity-emissivity ratio of 0.24 was observed for Ba 0.8 Sr 0.2 TiO 3 . Meanwhile, the solar absorptivity and infrared emissivity exhibited temperature stabilization, even affront heat-induced phase transition. Finally, the coupling relation between band gap, Ti–O vibration, and optical properties of Ba 1- x Sr x TiO 3 ceramics are clarified, which is promising to improve their radiative cooling performance.
研究领域:
材料科学
·
光学
·
热能工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Dan Yu,Jiahong He,Taiping Xie,Qiang Xu,Quanxi Zhu,Jun Yang,Jibin An,Feng Ye,Jiankang Wang,Bin Xiang
It is of significant to explore activation mechanism of peroxymonosulfate (PMS) for development of more active and robust metal oxide catalyst. Here, we discover a key role of Sr-O bond in boosting the catalytic activity of SrCo 0.81 Fe 0.19 O 2.78 perovskite. In this catalytic system, oxygen vacancy, Fe 4+ /Fe 3+ , and Co 3+ /Co 2+ redox cycles synergistically enhanced catalytic activity of SrCo 0.81 Fe 0.19 O 2.78 for antibiotic degradation with 100 % Florfenicol (FF) removal in 27 min. Moreover, this catalyst presented excellent stability although oxygen vacancy had a decrease after reuse. The influential factors including coexisting anions on FF degradation were systematically studied. Comparative experiments and theoretical calculation indicate Sr-O ionic bond provides electrons for Co-O and Fe-O covalent bonds to accelerate Fe 4+ /Fe 3+ , and Co 3+ /Co 2+ redox cycles for PMS activation . Finally, the FF degradation pathway over SrCoFe perovskite/PMS system was identified by LC-MS/MS.
研究领域:
环境科学
·
材料科学
·
化学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2020
·
IF 2.029
Jianxia Zhang,Li Liu,Chao Sun,Xiaosong Li,Bing Zhao,Xiangnan Ju,Chunxia Tian,Dan Sun,Guijun Nian
The 3D layered α-Fe 2 O 3 microflowers assembled by pure and Sr-doped nanosheets were prepared by hydrothermal and annealing methods. SEM morphological characterization results show that after the introduction of Sr, the microflowers are assembled from more layered nanosheets. XPS indicates that the material can provide more surface oxygen vacancy defects and oxygen adsorption sites, which is beneficial to the improvement of gas sensitivity. The response of 3 wt% Sr-doped α-Fe 2 O 3 with alkaline earth metal element Sr to 100 ppm ethanol (82.1) is 2.37 times that of pure α-Fe 2 O 3 (34.5) to ethanol at low temperature (220 °C).
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Jiangyu Yu,Yingbo Zhang,Decai Zhu,Wenliang Fan,Nan Wang,Yaohui Niu,Jiali Zhou,Chengjun Zhu
A major challenge for semiconductor ion fuel cells (SIFCs) is to design an electrolyte with proton transport properties so that it can maintain high ionic conductivity within relatively low temperatures. Herein, we develop a Sr and Mg codoped LaAlO3 electrolyte that facilitates efficient conduction of protons and oxygen ions by enriching oxygen vacancies and reducing the activation energy of ion conduction. The optimized electrolyte shows a low activation energy of 0.31 eV and demonstrates remarkably elevated ionic conductivity at low temperatures, e.g., 0.1994 S cm–1 at 550 °C. This is attributed to the significant increase in oxygen vacancies, which has been verified by XPS technology. Meanwhile, the Sr and Mg codoped LaAlO3 electrolyte exhibits remarkable proton transport properties, confirmed by proton filtration experiments, which provide further evidence for the improvement of the electrolyte ionic conductivity. As a result, the fuel cell with an optimized LaAlO3 electrolyte delivers an impressive peak power density of 977 mW·cm–2 with an open circuit voltage (OCV) of 1.126 V at 550 °C. Particularly, compared with the fuel cell with a pure LaAlO3 electrolyte, the peak power density is increased by 38.4%. The dual-ion doping strategy provides crucial insight into the further development of high ionic conductivity electrolytes for SIFCs.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 31
·期 4
·6511-6526
·
IF 5.8
Huang Likun,Wang Huixian,Wang Guangzhi,Mu Deying,Hou Yue,Di Xinyi,Zhou Simin,Wang Dongdong,Wang Dandan
The degradation of cellulosic ethanol wastewater by peroxymonosulfate (PMS) is one of the important methods to solve the environmental problems caused by it. In order to improve the degradation efficiency of cellulosic ethanol wastewater, the design of more catalytically active and stable chalcogenide catalysts has become a problem that needs to be solved nowadays. The application of foreign cations to replace the A- or B-site to increase the oxygen vacancy of the chalcocite catalyst to improve the efficiency of chalcocite catalytic degradation of wastewater has received much attention. In this work, the perovskite material LaCuO 3 was synthesized using a citric acid-sol–gel method, and the novel material La 1-x Sr x CuO 3 was prepared by doping of Sr element at the A position. In order to prepare catalytic materials with better performance, this study carried out performance-optimized degradation experiments on the prepared materials and determined that the catalytic efficiency of La 0.5 Sr 0.5 CuO 3 prepared under the conditions of the complexing agent dosage of 1:2, the gel temperature of 80 °C, and the calcination temperature of 700 °C was better than that of the catalytic materials prepared under other conditions. The prepared material has good recycling function; after four times recycling, the removal rate of pollutant COD is still more than 85%. This work provides a new synthesis method of perovskite material with good recycling function and high catalytic efficiency for the degradation technology of cellulosic ethanol wastewater. Graphical Abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
·
2022
·
IF 3.699
Tianxiang Ning,Yanzhi Zhang,Qian Zhang,Xuefeng Shen,Yinyi Luo,Taoyong Liu,Piao Liu,Zhiwei Luo,Anxian Lu
In this study, Ta single-doped Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (Ta 0.6 ) and a series of Ta, Sr co-doped Li 6.4+x La 3-x Sr x Zr 1.4 Ta 0.6 O 12 (Ta 0.6 Sr x , x = 0.1, 0.2, 0.3, and 0.4) electrolytes are synthesized via a two-step process. The XRD result reveals that all samples have a pure cubic phase, which indicates that Ta 5+ and Sr 2+ can enter the lattice of LLZO and stabilize the cubic phase. The SEM images exhibit that all samples have a dense microstructure and tight grain boundary without obvious holes. The excellent properties are achieved when the doping amount of Sr reaches 0.2 mol. Among all designed samples, the Ta 0.6 Sr 0.2 has the highest Li + conductivity and relative density of 8.54 × 10 −4 S cm −1 and 98.79%, respectively, as well as the lowest activation energy roughly 0.302 eV. Additionally, the symmetrical cell's galvanostatic cycling data show that it has excellent cycling performance and extremely low overpotentials even after 350 cycles, indicating that it can be successfully applied to next-generation all-solid-state lithium-ion batteries (ASSLIBs).
研究领域:
材料科学
·
电化学
·
能量存储
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
Hao Zhong,Jun-Wei Wang,Bin-Bin Dong,Lin Li,Ming-Ye Yang,Jun-Ling Yu,Xu Xin,Simeon Agathopoulos
The red-emitting Sr[LiAl 3 N 4 ]:Eu 2+ (SLA) phosphor was synthesized under flowing N 2 gas. A thin organosilica layer (about 5–10 nm) was coated on the surface of SLA phosphors by a very simple method, which transformed the phosphor surface from hydrophilicity to hydrophobicity . The contact angle of water droplets on the surface of the packed SLA phosphors was more than 140°. Compared with the unmodified sample, the modified SLA phosphors could keep at a high emission intensity for more than twice the time under an extremely high moisture level (at relative humidity of 100%, 85 °C). The hydrophobic modification could also improve the uniform dispersion of phosphors during assembly process of white LED .
研究领域:
材料科学
·
化学
·
光电
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-7
·
IF 12.121
Song Yongbo,Li Yingwei,Li Hao,Ke Feng,Xiang Ji,Zhou Chuanjun,Li Peng,Zhu Manzhou,Jin Rongchao
Gold-copper alloys have rich forms. Here we report an atomically resolved [Au 52 Cu 72 ( p -MBT) 55 ] + Cl − nanoalloy ( p -MBT = SPh- p -CH 3 ). This nanoalloy exhibits unusual structural patterns. First, two Cu atoms are located in the inner 7-atom decahedral kernel (M 7 , M = Au/Cu). The M 7 kernel is then enclosed by a second shell of homogold (Au 47 ), giving rise to a two-shelled M 54 (i.e. Au 52 Cu 2 ) full decahedron. A comparison of the non-truncated M 54 decahedron with the truncated homogold Au 49 kernel in similar-sized gold nanoparticles provides for the first time an explanation for Marks decahedron truncation. Second, a Cu 70 (SR) 55 exterior cage resembling a 3D Penrose tiling protects the M 54 decahedral kernel. Compared to the discrete staple motifs in gold:thiolate nanoparticles, the Cu-thiolate surface of Au 52 Cu 72 forms an extended cage. The Cu-SR Penrose tiling retains the M 54 kernel’s high symmetry ( D 5h ). Third, interparticle interactions in the assembly are closely related to the symmetry of the particle, and a “quadruple-gear-like” interlocking pattern is observed.
研究领域:
材料科学
·
纳米技术
·
化学
·
晶体学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Li Fu,Yong Huang,Wen Cai,Huaiwei Zhang,Jiehui Yang,Dihua Wu,Weitao Su
Improving the hydrophilicity of titania nanotubular arrays (TNAs) could promote their interfacial reaction rate when they interact under aqueous conditions. In this work, we proposed a simple hydrothermal method for Si and Sr doping. A significant hydrophilicity improvement could be observed in TNAs after the doping process. Therefore, Si@Sr/TNAs exhibited a superior urease loading and showed excellent chronocoulometric performance towards urea interaction.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）