ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Menglin Wu,Jiupai Ni,Chengsheng Ni
In situ exsolution of nanoparticles has been reported to be an efficient path to optimize CO2 electrolysis performance. Herein, a Ce/Co co-doped SrFeO3-δ (SF) can achieve the co-exsolution of CeO2 and Co–Fe alloy in 5% H2 at 800 °C. A small amount (<10%) of Ce-doped SF cannot stabilize the perovskite structure in a reducing atmosphere. Sr0.9Ce0.1Fe0.9Co0.1O3 (10Ce10CoF) and Sr0.95Ce0.05Fe0.9Co0.1O3 (5Ce10CoF) as symmetric electrodes of solid oxide electrolysis cells showed an excellent electrolysis performance at 800 °C for CO2 electrolysis. The current densities of the cells with 5Ce10CoF and 10Ce10CoF reached 0.98 and 1.30 A cm–2 under a bias of 1.3 V after a 48 h durability test for CO2 electrolysis, respectively, and the performance difference, however, may be due to CeO2 being more easily exsolved from the 10Ce10CoF lattice. We also investigated the role of the exsolved CeO2 and oxygen vacancy (VO) in determining the CO2 electrolysis performance via theoretical calculation. In this work, we designed a novel strategy to achieve the exsolution of CeO2 and Co–Fe alloy via reduction treatment and showed an outstanding CO2 electrolysis performance.
研究领域:
材料科学
·
化学工程
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Changli Zhu,Shisheng Hou,Linxi Hou,Kui Xie
High temperature carbon dioxide electrolyzers are expected to play a key role on carbon-neutral energy cycle. Here we report a novel composite, namely perovskite SrFeO 3−δ with impregnated Ni nanoparticles , as an advanced cathode materials for solid oxide electrolysis cells (SOECs). The XRD , SEM and TEM together indicate that the homogeneously distributed Ni nanoparticles on SrFeO 3−δ substrate create sufficient and active triple-phase boundary (TPB) for electrochemical carbon dioxide splitting. Electrochemical measurements show that this tailored SrFeO 3−δ cathode demonstrates better performance, and then exhibits long-term stability after 100 h operation and 8 redox cycles.
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
ENERGY & FUELS
·
2022
·
IF 4.654
Xue-Lei Duan,Yuan-Ming Cao,Chong Gao,Sheng-Li Niu,Yi-Wen Shen,Qi Guo,Jiao-Jiao Xie,Kai-Qiang He,Chun-Gang Yuan
One novel/multifunctional selenium-doped SrFeO3-δ/HNTs composite was fabricated and used for immobilization of gaseous mercury. The composite showed excellent performances for Hg0 removal via adsorption coupled with photocatalytic oxidation in visible-light conditions. The adsorption capacity of 4271.15 μg·g–1, rate of 5.0 μg·g–1·min–1, and removal efficiency of ∼100% were obtained under N2+O2, which was further confirmed by reaction kinetics. SrFeO3-δ was selenized into iron diselenide and a Se–Fe bond with high affinity toward Hg0. In addition, the yielding of •O2– and the separation of photoexcited electrons and holes (h+) promoted the photocatalytic oxidation of mercury. The composite with intrinsic magnetism could be easily recycled for reuse by magnetic separation. Moreover, the composite possessed favorable tolerance to the complicated flue gas. An online lab-built thermal decomposition system demonstrated that the immobilized Hg was primarily HgSe, which exhibited very high stability and low toxicity. Density functional theory (DFT) calculations proved that the composite was half metal with magnetism, indicating that Hg on Se-SrFeO3-δ/HNTs formed the stable structure releasing 1.055 eV. The doping of selenium promoted the charge transfer between O (2p) and Hg (6s), which also favored Hg0 removal. Se-SrFeO3-δ/HNTs with recyclability possess great potentials for Hg0 efficient removal and immobilization/detoxification from flue gas.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 7
·1460
·
IF 3.2
Jiajia Cui,Yueyue Sun,Chaofan Yin,Hao Wang,Zhengrong Liu,Zilin Zhou,Kai Wu,Jun Zhou
The development of symmetrical solid oxide fuel cells with identical cathode and anode is beneficial for thermal matching and reducing the cost. Herein, proton-conducting electrolyte and novel high catalytic activity electrode material for symmetrical solid oxide fuel cells are proposed. Ni-doping at the B-site of (Sr0.8Ce0.2)0.95FeO3−δ(SCF) indicates reduced cell edge lengths, cell volume, and a more porous honeycomb structure. The B-site elements in oxide tend to have a high oxidation state via Ni-doping. Simple doping modification in SCF causes better thermal matching between the electrode and electrolyte and form more oxygen vacancies at the operating temperature. At the anode side, Ni-doping improves the stability of the symmetric electrode in reducing the atmosphere. The polarization resistance of symmetrical cells for new electrode material is half of the original both in oxidation and reduction atmosphere, which indicates boosted electrochemical performance for the cathode and anode. At the same time, Ni-doping reduces the impedance activation energy of the anode reaction in symmetric cells. The output performance of the cell is 210.4 mW·cm−2at 750 °C and the thickness of the electrolyte is 400 μm, achieving a highly efficient symmetrical electrode in proton ceramic fuel cells. The new finding of materials provides a novel high efficiency symmetrical electrode and proposes guidance for the improvement of solid oxide fuel cells at a reduced temperature.
研究领域:
材料科学
·
能源工程
·
固体氧化物燃料电池研究
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产品关联
DOI
PubMed
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 9
·2102-2109
·
IF 5.6
Jiang Shanshan,Qiu Hao,Xu Shaohua,Xu Xiaomin,Jiang Jingjing,Xiao Beibei,Julião Paulo Sérgio Barros,Su Chao,Chen Daifen,Zhou Wei
To explore highly active and thermomechanical stable air electrodes for intermediate-temperature solid oxide fuel cells (IT-SOFCs), 10mol% Ta 5+ doped in the B site of strontium ferrite perovskite oxide (SrTa 0.1 Fe 0.9 O 3− δ , STF) is investigated and optimized. The effects of Ta 5+ doping on structure, transition metal reduction, oxygen nonstoichiometry, thermal expansion, and electrical performance are evaluated systematically. Via 10mol% Ta 5+ doping, the thermal expansion coefficient (TEC) decreased from 34.1 × 10 −6 (SrFeO 3− δ ) to 14.6 × 10 −6 K −1 (STF), which is near the TEC of electrolyte (13.3 × 10 −6 K −1 for Sm 0.2 Ce 0.8 O 1.9 , SDC), indicates excellent thermomechanical compatibility. At 550–750°C, STF shows superior oxygen vacancy concentrations (0.262 to 0.331), which is critical in the oxygen-reduction reaction (ORR). Oxygen temperature-programmed desorption (O 2 -TPD) indicated the thermal reduction onset temperature of iron ion is around 420°C, which matched well with the inflection points on the thermos-gravimetric analysis and electrical conductivity curves. At 600°C, the STF electrode shows area-specific resistance (ASR) of 0.152 Ω·cm 2 and peak power density (PPD) of 749 mW·cm −2 . ORR activity of STF was further improved by introducing 30wt% Sm 0.2 Ce 0.8 O 1.9 (SDC) powder, STF + SDC composite cathode achieving outstanding ASR value of 0.115 Ω·cm 2 at 600°C, even comparable with benchmark cobalt-containing cathode, Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3− δ (BSCF). Distribution of relaxation time (DRT) analysis revealed that the oxygen surface exchange and bulk diffusion were improved by forming a composite cathode. At 650°C, STF + SDC composite cathode achieving an outstanding PPD of 1117 mW·cm −2 . The excellent results suggest that STF and STF + SDC are promising air electrodes for IT-SOFCs.
研究领域:
材料科学
·
能源化学
·
电化学
·
无机非金属材料
·
热力学与动力学分析
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yeku Wang,Shengxin Li,Deqiu Zou,Nan Sheng,Chunyu Zhu
Developing high-performance materials for integrated thermal energy storage and oxygen production is critical for advancing sustainable energy systems. Aluminum as heat storage phase change materials has a high latent heat storage density, but suffering from the leakage problems. The SrFeO 3− δ (SFO) oxygen carrier exhibits exceptional redox activity for air separation with a high reduction enthalpy of 96 kJ/mol. In this study, we report a multifunctional composite macrocapsules composed of SFO shell and metallic aluminum core, engineered to synergistically combine thermochemical, latent, and sensible heat storage with air separation capabilities. The composite macrocapsule has a high heat storage capacity of 435.9 J/g at a temperature duration of 873 K to 1073 K and an oxygen storage capacity of 1.69 wt%. After conducting 50th thermal cycles in air for the composite macrocapsules, the samples remain unbroken and the oxygen absorption/release and heat storage capacities remain stable. The synergy between the thermochemical properties of SFO and the phase change heat storage of aluminum enables dual functionality, i.e., efficient high-temperature heat storage and on-demand air separation for chemical looping applications. This work provides a scalable paradigm for multifunctional energy materials, bridging the gap between thermal management and carbon neutral technologies.
研究领域:
材料科学
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储能技术
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化学工程
·
热管理
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2020
·
IF 12.35
Bangxin Li,Shuai He,Jibiao Li,Xiangling Yue,John T.S. Irvine,Deti Xie,Jiupai Ni,Chengsheng Ni
Employment of identical oxides for the cathode and anode in a symmetrical solid oxide fuel cell (SSOFC) is beneficial for decreasing the fabrication costs of a robust cell. Ce doping on the A site of SrFeO3 increased the structural stability in a reducing atmosphere, but ceria was found to exsolve from the perovskite during the cooling process in the air if the doping level reached 20 atom %. The additional doping of 5 atom % Ru in Sr0.8Ce0.2FeO3 on the Fe site could prevent the ceria segregation in air and induce the surface decomposition under fuel conditions for the formation of nanoscale SrO, CeO2, and Ru0. The SSOFC with Ce/Ru codoped SrFeO3 on a Sr- and Mg-doped LaGaO3 electrolyte showed a small Rp value (0.12 Ω cm2) when H2 and ambient air were used as fuel and oxidant, respectively. The peak power densities of 846 and 310 mW cm–2 were achieved at 800 °C using H2 and C3H8 as fuel, respectively. The excellent coke resistance of the anode could be related to the simultaneous in situ exsolution of CeO2, SrO, and Ru0 nanoparticles.
研究领域:
材料科学
·
电化学
·
能源材料
·
燃料电池
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Yuxi Sun,Chuangang Yao,Zhe Zhang,Baixi Xia,Haixia Zhang,Jingyi Ding,Li Zhang,Wenwen Zhang,Xiaoshi Lang,Kedi Cai
The sluggish of the oxygen reduction reaction (ORR) kinetics and the susceptibility to CO 2 interactions are major barriers to the widespread application of solid oxide fuel cells (SOFCs). In this study, a non-metal cation doping strategy was employed to enhance the ORR catalytic activity and CO 2 tolerance of SrFeO 3- δ cathode. SrFe 1- x P x O 3- δ (SFP x , x = 0, 0.05, 0.1, 0.15, 0.2) materials were synthesized by substituting phosphorus (P) for Fe in SrFeO 3- δ . The doping of P facilitated the formation of oxygen vacancies in SrFeO 3- δ , enhancing oxygen adsorption, dissociation, diffusion, and charge transfer processes, leading to a notable increase in ORR catalytic activity. At 800 ℃, the polarization resistance of SFP 0.15 was 0.08 Ω cm 2 , a reduction of 42.86 % compared to undoped SrFeO 3- δ . Additionally, SFP 0.15 achieved a peak power density of 749.36 mW cm 2 , representing a 91.99 % enhancement over SrFeO 3- δ . These findings suggest that non-metal cation doping is an effective approach to boost the performance of SrFeO 3- δ perovskite cathode.
研究领域:
材料科学
·
电化学
·
能源材料
·
燃料电池
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·Vol. 47
·期 79
·33664-33676
·
IF 7.139
Xinhe Wang,Stéphane Abanades,Srirat Chuayboon,Junshe Zhang,Jinjia Wei
Strontium ferrite (SrFeO 3-δ ) is a very attractive oxygen transfer agent for chemical looping reactions and hydrogen-rich syngas generation . Dispersing SrFeO 3 in a medium such as Ca 0.5 Mn 0.5 O could enhance the activity and cyclability. In this study, SrFeO 3-δ -Ca 0.5 Mn 0.5 O (30 wt% SrFeO 3-δ ) nanocomposite with a reticulated foam structure was explored as the oxygen carrier for chemical looping reforming of methane in a solar tubular reactor. The foam nanocomposite was prepared by a hard-templating method. The performance was investigated at temperatures of 850–1000 °C and methane flowrates of 25–250 STP mL/min, and the oxidative gas was either CO 2 or H 2 O in the oxidation step . In the reduction step of 27 successive redox cycles, the production rate of CO changed marginally and CO yield maintained at about 1.9 mmol/g, even though sintering occurred. The productivity of H 2 decreased first and then tended to be stable at 3.8 mmol/g (i.e., twice the CO yield) as the cycling number increased (the average oxygen storage capacity of the material was ∼1.95 mmol/g). Microscopic and X-ray diffraction investigations suggested that the element distribution pattern and crystalline phase of the foam nanocomposite remained almost unchanged after 27 redox cycles, confirming material stability. The maximum solar-to-fuel efficiency for the foam nanocomposite was 5.68%, which was 21.4% higher than that for the powder nanocomposite. To increase syngas productivity and solar-to-fuel efficiency, it is required to conduct the reforming reaction at high temperatures and methane flowrates. However, the energy upgrade factor will decrease as methane flowrate increases.
研究领域:
材料科学
·
能源工程
·
化学工程
·
太阳能转换
·
催化
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yin Qiao,Jiahao He,Yang Zhou,Shibo Wu,Xiaoyan Li,Guangming Jiang,Guohua Jiang,Muslum Demir,Pianpian Ma
The defective structure and high oxygen vacancy concentration of SrFeO3−δ perovskite enable fast ion-electron transport, but its low conductivity still hinders the high electrochemical performance. Herein, to enhance the conductivity of SrFeO3−δ-based electrodes, polypyrrole-modified SrFeO3−δ perovskite on carbon cloth (PPy@SFO@CC) has been successfully fabricated by electrodeposition of polypyrrole (PPy) on the surface of SFO@CC. The optimal PPy700@SFO@CC electrode exhibits a specific capacitance of 421 F g–1 at 1 A g–1. It was found that the outside PPy layer not only accelerates the electron transport and ion diffusion but also creates more oxygen vacancies in SrFeO3−δ, enhancing the charge storage performance significantly. Moreover, the NiCo2O4@CC//PPy700@SFO@CC device maintains a specific capacitance of 63.6% after 3000 cycles, which is ascribed to the weak adhesion forces between the active materials and carbon cloth. Finally, the all-solid-state flexible supercapacitor NiCo2O4@CC//PPy700@SFO@CC is constructed with PVA-KOH as the solid electrolyte, delivering an energy density of 16.9 W h kg–1 at a power density of 984 W kg–1. The flexible supercapacitor retains 69% of its specific capacitance after 1000 bending and folding times, demonstrating a certain degree of foldability. The present study opens new avenues for perovskite oxide-based flexible all-solid-state supercapacitors.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Xin Tian,Chaohe Zheng,Haibo Zhao
The current study investigates Ce-modified SrFeO 3- δ oxygen carriers for oxidative dehydrogenation (ODH) of ethane coupled with CO 2 splitting in a chemical looping manner. During 39 cycles of redox testing over the sample of 0.2Ce/SrFeO 3 , up to 29% ethane conversion and 82% ethylene selectivity are achieved, and the CO generation in the subsequent CO 2 splitting step is 0.25 mmol/g. XPS characterization results indicate decreased Fe 2+ /(Fe 3+ +Fe 4+ ) ratio as well as increased active oxygen species proportion on the near-surface of Ce-modified samples, which are responsible for the improved activity of the 0.2Ce/SrFeO 3 in ethane ODH reaction. DFT calculations further reveal that the increased ODH activity of 0.2Ce/SrFeO 3 is due to the lower surface oxygen vacancy formation energy upon Ce promotion. Moreover, the higher resistance of lattice oxygen diffusion from the bulk to the surface is the main reason for the superior ethylene selectivity attained by the CO 2 -regenerated sample than that by O 2 regeneration.
研究领域:
化学工程
·
材料科学
✓ 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）