JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2023
·
IF 4.5
Ruobing Zheng,Lili Zhu,Changdian Li,Ziqiang Wu,Yanan Huang,Jie Yang,Renhuai Wei,Xuebin Zhu,Yuping Sun
Misfit-layered Ca 3 Co 4 O 9 was investigated as oxygen evolution reaction catalyst for electrochemical water splitting. Oxygen vacancies can be effectively induced by ball milling as detected by electronic paramagnetic resonance and X-ray photoelectron spectrometer measurements. The electrochemical performance was investigated for the Ca 3 Co 4 O 9 catalysts with different ball milling times. The results show that the sample with the ball milling time of 24 h possesses the best performance due to the induced oxygen vacancies as well as the enhanced specific surface area. This work will provide an effective route to improve the electrochemical oxygen evolution reaction performance of the misfit-layered cobaltates.
研究领域:
材料科学
·
电催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Lei Zhang,Xing Hong,Zhiquan Chen,Dingkang Xiong,Jiaming Bai
The ( x ) In 2 O 3 /(1- x ) Ca 3 Co 4 O 9 ( x = 0-15 wt%) composites were prepared using the solid reaction method followed by a spark plasma sintering process. There is no reaction occurring, and the natural c -axis grain-oriented structure is observed in all samples by XRD measurements. Scanning electron microscopy and Energy dispersive spectroscopy observations indicate that the In 2 O 3 nanoparticles are present as the ultrafine particles/clusters secondary phase in Ca 3 Co 4 O 9 . Electric properties measurement shows that the electrical conductivity reduced by adding In 2 O 3 particles, while the seebeck coefficient is virtually unaffected, which leads to the low power factor PF value of Ca 3 Co 4 O 9 . Significantly, however, there is an obvious recovery in the electrical conductivity of S15 sample compared to that of S5 and S10 samples, which also results in a rise again in PF of S15. This result may be of significance for further increase In 2 O 3 secondary phase content ( x > 15 wt%) to enhance the thermoelectric property of Ca 3 Co 4 O 9 .
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Yuan Li,Xu Zhang,Yanting Tian,Xueying Wu,Lei Wang,Jiping Zhu
The electrochemical performance of Ca 3 Co 4 O 9+δ (CCO) oxygen electrode with La 0.6 Sr 0.4 FeO 3-δ (LSF) interlayer in YSZ-based reversible solid oxide cells (RSOCs) was investigated in present work. Results proved that CCO oxygen electrode with LSF interlayer had a superior stability under alternating anodic and cathodic polarization . Both the polarization resistance and overpotential of the CCO electrode with LSF interlayer were significantly reduced compared to that with Ce 0.9 Gd 0.1 O 1.95 (GDC) interlayer, which confirmed the improvement of the redox reactivity of the oxygen electrode. The maximum power density of Ni-YSZ/YSZ/LSF/CCO fuel cell was 1276 mW cm −2 at 800 °C. An electrolysis current density of 1695 mA cm −2 was achieved at 1.5 V and 50% H 2 O. The hydrogen production rate of the electrolysis cell improved by 2 times than that with the GDC interlayer. Results made clear reliability of LSF as an interlayer in YSZ-based RSOCs.
研究领域:
材料科学
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能源工程
·
电化学
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 11
·4841-4849
·
IF 2.8
Yue Xing,Huang Xiqiang,Zhang Yaohui,Wei Bo,Lv Zhe
Ca 3 Co 4 O 9+δ (CCO) cathode has been extensively studied for its excellent thermal expansion matching with commonly used electrolytes. CCO composite cathode with different concentrations of La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3 (LSGM) was prepared to evaluate its performance on LSGM electrolyte in this work. The appropriate amount of LaCoO 3 generated by the in-situ reaction of CCO and LSGM under operating conditions significantly enhances the oxygen exchange ability of CCO cathodes. The composite cathode containing 60 wt. % CCO and 40 wt. % LSGM (C-LGM60) exhibits the best electrochemical performance and the lowest polarization impedance among the C-LGM series cathodes. The area-specific resistance (ASR) of C-LGM60 is 0.06 Ωcm 2 at 750 °C. The maximal power density of the electrolyte-supported cell with C-LGM60 cathode reaches 489 mWcm -2 at 800 °C. After a 10 h stabilizing, there is no observable decline of the cell during the next 40 h of discharge. These results encourage the research of using CCO cathode on LSGM electrolytes and make valuable improvements on the development of SOFC cathode.
研究领域:
材料科学
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电化学
·
能源材料
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固体氧化物燃料电池
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·Vol. 48
·期 22
·33967-33975
·
IF 5.532
Ya-nan Li,Ping Wu,Shiping Zhang,Yili Pei,Jinguang Yang,Sen Chen,Li Wang
Adding nanoparticles is a method to regulate the performance of thermoelectric materials. Ca 3 Co 4 O 9 /x MoSi 2 (x = 0, 0.05, 0.10, 0.13, and 0.16) was synthesized by a wet chemical method combined with atmospheric pressure sintering. The XRD and SEM results reveal that there are no other reaction in the samples. The grain size of all samples decrease with increasing MoSi 2 content, and all presented a similar flake morphology. The influence of MoSi 2 on the thermoelectric performance of Ca 3 Co 4 O 9 is systematically analysed. The appropriate addition of nano-MoSi 2 particles can increase the carrier concentration and enhance conductivity of Ca 3 Co 4 O 9 . The electrical conductivity of Ca 3 Co 4 O 9 /0.05 MoSi 2 is 83.16 Scm −1 , which is 49.2% higher than that of Ca 3 Co 4 O 9 at 1080 K. The Seebeck coefficient of the Ca 3 Co 4 O 9 /0.16 MoSi 2 sample reaches 197.56 μVK −1 at 980 K, which is significantly better than that of previously reported samples prepared by the same method. Moreover, combined with the experimental results and the analysis of the effective medium theory model, the addition of MoSi 2 can effectively debase the thermal conductivity of Ca 3 Co 4 O 9 . The thermal conductivity of Ca 3 Co 4 O 9 /0.16 MoSi 2 (∼1.26 Wm −1 K −1 , 1080 K) samples decrease greatly, which is attributed to the influence of interfacial thermal resistance and pores in the Ca 3 Co 4 O 9 /MoSi 2 . The ZT value of the Ca 3 Co 4 O 9 /0.05 MoSi 2 sample increases by 44.4% compare with that of Ca 3 Co 4 O 9 and reaches 0.26 at 1080 K. These results demonstrate that adding an appropriate amount of MoSi 2 particles is one of the methods to enhance the thermoelectric performance of Ca 3 Co 4 O 9 ceramic samples.
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
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能源材料
·
热电转换
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·Vol. 47
·期 5
·6548-6553
·
IF 3.83
Chuangchuang Ruan,Hongzhang Song,Mengmeng Fan,Haoshan Hao,Shaohui Liu
Misfit-layered oxides Ca 3 Co 4 O 9+δ + z wt% SiC ( z = 0.00, 0.025, 0.05, 0.1, 0.2) samples were synthesized using solid-state sintering method and the effects of SiC nanoparticles diapersion on the thermoelectric properties were investigated. Thermoelectric properties of Ca 3 Co 4 O 9+δ + z wt% SiC ( z = 0.00, 0.025, 0.05, 0.1, 0.2) were investigated up to 923 K. Compared with pure sample, the electrical resistivity of SiC-added samples reduces, for Ca 3 Co 4 O 9+δ + z wt% SiC ( z = 0.00, 0.025, 0.05, 0.1, 0.2) ceramic samples with x ≤ 0.05, the electrical resistivity decreases with increasing SiC nanoparticles adding amounts. And, the electrical resistivity exists transition from semiconductor to metal conduction mechanism. While, the thermal conductivity also decreases due to the addition of SiC nanoparticles . As a result, the Ca 3 Co 4 O 9+δ + 0.2 wt% SiC sample had the lowest thermal conductivity of 1.47 W/Km at 923 K, which was 18.4% lower than that of the Ca 3 Co 4 O 9+δ sample. The ZT value of Ca 3 Co 4 O 9+δ + 0.05 wt% SiC can reach 0.218, which is 40.9% higher than the pure Ca 3 Co 4 O 9+δ sample.
研究领域:
材料科学
·
凝聚态物理
·
无机非金属材料
·
能源材料
✓ 已验证
DOI
高影响因子
Science China-Technological Sciences
·
2020
·Vol. 64
·期 3
·673-679
·
IF 2.302
Guan ShouJie,Fan QingLu,Liu LiYing,Luo JunCai,Zhong YiCheng,Zhao WeiMin,Huang ZhenCai,Shi ZhiCong
Transition metal oxides have high specific capacity as anode materials for lithium-ion battery. But aggregation of particles and volume expansion during lithiation/delithiation restrict their application. In this work, a three-dimensional hierarchical Ca 3 Co 4 O 9 hollow fiber network assembled by nanosheets is prepared by a electrospinning combining with heat treatment method to overcome these issues and to boost its lithium storage performance. As-synthesized sample possesses excellent cyclic stability (578.6 mA h g −1 at 200 mA g −1 after 500 cycles) and rate performance (293.5 mA h g −1 at 5000 mA g −1 ), much better than those of commercial Co 3 O 4 . Furthermore, the fast kinetics of the three-dimensional Ca 3 Co 4 O 9 hollow fiber network is also confirmed by the variable scan rates CV tests and the EIS measurements, which is dedicated to the specific hierarchical hollow fiber network structure that provides shorter ion transport distances and higher electrical conductivity. This work supplies a universal approach to improve the electrochemical performance of transition metal oxides for lithium ion batteries.
研究领域:
材料科学
·
储能
·
电化学
·
纳米材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Xueying Wu,Yanting Tian,Yongjia Zhang,Wei Guo,Yuan Li,Jiping Zhu,Lei Wang
Exsolution of active nanoparticles in oxide materials is an effective and feasible way to promote the catalytic activities of electrodes for solid oxide cells (SOCs). In this study, Ca-site deficient Ca x Co 4 O 9+δ (CCO-x, x = 1.5, 2, 2.5) materials are facilely prepared and studied as oxygen electrodes of SOCs. Co 3 O 4 nanoparticles are in-situ exsolved and well embedded on the Ca 3 Co 4 O 9+δ (CCO-3.0) surface by high-temperature annealing at 850 °C in ambient air. Results proves an effectively promotion of the ORR and OER kinetics with Ca deficiency. The polarization resistance of CCO-1.5 oxygen electrode reduces by 60% as compared with that of the CCO-3.0 electrode at 800 °C, from 0.23 to 0.09 Ω cm 2 . Both the peak power density and the electrolysis current density of the anode-supported SOC with CCO-1.5 oxygen electrode are more than 2 times that of the CCO-3.0 cell. The improved electrochemical kinetics is attributed to the exsolved Co 3 O 4 nanoparticles with high redox reactivity and the enhanced oxygen vacancy concentration. Results make clear reliability of Ca-site deficient Ca x Co 4 O 9+δ as a promisingly oxygen electrodes for SOCs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）