ELECTROCHIMICA ACTA
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2019
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IF 5.383
Peng Qiu,Jin Li,Lichao Jia,Bo Chi,Jian Pu,Jian Li,Fanglin Chen
Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) is a promising cathode for intermediate temperature solid oxide fuel cells. However, BSCF cathode performance stability has been a challenge and its electrochemical performance deteriorates severely in the presence of Cr 2 O 3 -forming metallic interconnect. We demonstrate that LaCoO 3-δ (LC) coating on BSCF cathode can not only enhance BSCF electrochemical performance, but also effectively improve the BSCF performance stability. In this study, LC-coated BSCF-Gd 0.1 Ce 0.9 O 1.9 (LC@BSCF-GDC) cathode is prepared through a solution impregnation method and systematically characterized. EIS, XRD, Raman, SEM and EDS tests with and without SUS430 interconnect are conducted to characterize the Cr-tolerance. The results show that BSCF-GDC cathode is susceptible to Cr poisoning while LC@BSCF-GDC cathode has significantly enhanced tolerance to Cr poisoning. Single cells with LC@BSCF-GDC cathode achieve higher peak power density and smaller polarization resistance values than single cells with BSCF-GDC cathode. Furthermore, significant improvement of performance stability under a constant current load has been achieved for single cells with LC@BSCF-GDC cathode. This work provides a new solution for solving BSCF cathode performance stability.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2018
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IF 4.229
Peng Qiu,Ao Wang,Haoyu Zheng,Lichao Jia,Bo Chi,Jian Pu,Jian Li
LaCoO 3-δ (LC)-coated Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ (BSCF) cathode is fabricated by the solution impregnation method and promoted electrochemical performance is obtained. After being coated by LC shell, the polarization resistance can be as low as 0.197 Ω cm 2 and the peak power density is 0.243 W cm −2 at the operating temperature of 600 °C. The excellent CO 2 resistance of LC-coated BSCF cathode is verified by the CO 2 -poisoning test. Even in the operating atmosphere with high CO 2 concentration, the polarization resistance change of LC-coated BSCF cathode is much smaller than that of the blank BSCF cathode. By long-term test of single cells, the remarkable electrochemical performance stability of LC-coated BSCF cathode is shown. The promoted electrochemical performance, excellent CO 2 resistance and remarkable long-term stability make LC-coated BSCF cathode promising for intermediate temperature solid oxide fuel cells.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Di Liu,Mingpeng Chen,Keyu An,Dong Liu,Yuyun Chen,Pengfei Zhou,Jielei Li,Jinxian Feng,Ye Ke,Detao Liu,Pengcheng Zhao,Chi Tat Kwok,Shi Chen,Shuangpeng Wang,Weng Fai Ip,Hui Pan
Perovskite oxides have been considered as ideal electrocatalysts for water electrolysis since they are eco-friendly, abundant, and easy to be fabricated. However, their application in hydrogen evolution reaction (HER) is still limited because of relatively poor efficiency and stability. Herein, we report that a facile fabrication method, pulsed laser deposition , is employed to fabricate nanoscale LaCoO 3−δ on nickel foam as an active electrocatalyst for HER. We find that in-situ surface reconstruction takes place in HER cycles, which enhances the HER activity greatly. By depositing additional NiO layer and annealing in H 2 atmosphere, the catalytic performance and long-term stability of LaCoO 3−δ can be further improved. As a result, the catalyst demonstrates a remarkable HER activity with a low overpotential of 180 mV at 10 mA cm −2 and superb stability up to 50 h in alkaline media. Our work uncovers that the underlying phase transition in an alkaline medium and the interface engineering play critical roles in the improved HER activity of perovskite oxides. This work may provide insightful guidance to engineer perovskite oxides as electrocatalysts in the electrolysis of water.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Xixi Wang,Lei Ge,Qian Lu,Jie Dai,Daqin Guan,Ran Ran,Shih-Chang Weng,Zhiwei Hu,Wei Zhou,Zongping Shao
Constructing catalysts with a low overpotential for the oxygen evolution reaction (OER) is critical for the increased application of rechargeable Zn-air batteries. Herein, an in-situ cobalt extraction and simultaneous coordination growth strategy is adopted to develop an active and robust interface between nanostructural Co-metal-organic framework (Co-MOF) pillars and perovskite LaCoO 3-δ (LC). Moreover, the multi-active cobalt sites, including Co 3+ in the LC and coordinatively unsaturated cobalt sites in the Co-MOF, could promote the deprotonation of oxygen adsorption intermediates and act as catalytic active centres. Therefore, the optimal sample exhibits excellent OER activity with a low overpotential of 330 mV. Notably, the Zn-air battery with Co-MOF/LC-0.5 as the OER catalyst exhibits a low charge potential of 2.03 V and excellent cycling stability. This work illustrates efficient electrochemical catalysts based on perovskites with low overpotentials that are prepared by an in-situ growth strategy, and have great potential in rechargeable Zn-air batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 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）