Ni-Doped La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> Perovskite as an Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions in Alkaline Media
The Co-based perovskite La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> has received significant attention as a potential electrocatalyst for its oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) due to its abundance, facile synthesis, and high o...
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MDPI AG
2023-10-01
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| Online Access: | https://www.mdpi.com/2073-4344/13/10/1366 |
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| author | Ronghua Yuan Weina Xu Liquan Pan Ruibin Li Chuanying Xiao Xiaochang Qiao |
| author_facet | Ronghua Yuan Weina Xu Liquan Pan Ruibin Li Chuanying Xiao Xiaochang Qiao |
| author_sort | Ronghua Yuan |
| collection | DOAJ |
| description | The Co-based perovskite La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> has received significant attention as a potential electrocatalyst for its oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) due to its abundance, facile synthesis, and high oxygen kinetics. However, research on the catalytic performance of Ni-doped La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>1−x</sub>Ni<sub>x</sub>O<sub>3</sub> as a bifunctional cathode catalyst for Zn-air batteries (ZABs) is still scarce. In this work, lanthanum strontium cobalt-based perovskite catalysts with various Ni contents (La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>1−x</sub>Ni<sub>x</sub>O<sub>3</sub>, x = 0, 0.2, 0.5, and 0.8) were synthesized using a simple combustion method. The effects of Ni doping on the morphology, structure, surface oxygen-related species, and valence states of the transition metals of the perovskite were characterized. The electrochemical behaviors of the perovskite catalysts in both ORR and OER were also assessed. The characterization results revealed that proper Ni doping can decrease particle size, increase surface oxygen vacancies, and create mixed valence states of the transition metal and, thus, lead to improvement of the electrocatalytic activity of perovskite catalysts. Among the different perovskite compositions, La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3</sub> exhibited the best ORR/OER activity, with a higher limiting current density, smaller Tafel slope, higher half-wave potential, lower overpotential, and lower potential difference than the other compositions. When La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3</sub> was applied as the cathodic catalyst in a primary ZAB, it delivered a peak power density of 81 mW cm<sup>−2</sup>. Additionally, in rechargeable ZABs, the La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3</sub> catalyst exhibited a lower voltage gap (0.94 V) and higher stability during charge–discharge cycling than the commonly used catalyst Pt/C. These results indicate that Ni-doped La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3</sub> is a promising bifunctional electrocatalyst for ZAB. |
| first_indexed | 2024-03-10T21:21:58Z |
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| spelling | doaj.art-d105a5d310b8475dabe1014474248cdf2023-11-19T16:01:34ZengMDPI AGCatalysts2073-43442023-10-011310136610.3390/catal13101366Ni-Doped La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> Perovskite as an Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions in Alkaline MediaRonghua Yuan0Weina Xu1Liquan Pan2Ruibin Li3Chuanying Xiao4Xiaochang Qiao5School of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, ChinaSchool of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, ChinaSchool of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, ChinaSchool of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, ChinaSchool of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, ChinaSchool of Materials Science and Engineering, Dongguan University of Technology, Dongguan 523808, ChinaThe Co-based perovskite La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> has received significant attention as a potential electrocatalyst for its oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) due to its abundance, facile synthesis, and high oxygen kinetics. However, research on the catalytic performance of Ni-doped La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>1−x</sub>Ni<sub>x</sub>O<sub>3</sub> as a bifunctional cathode catalyst for Zn-air batteries (ZABs) is still scarce. In this work, lanthanum strontium cobalt-based perovskite catalysts with various Ni contents (La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>1−x</sub>Ni<sub>x</sub>O<sub>3</sub>, x = 0, 0.2, 0.5, and 0.8) were synthesized using a simple combustion method. The effects of Ni doping on the morphology, structure, surface oxygen-related species, and valence states of the transition metals of the perovskite were characterized. The electrochemical behaviors of the perovskite catalysts in both ORR and OER were also assessed. The characterization results revealed that proper Ni doping can decrease particle size, increase surface oxygen vacancies, and create mixed valence states of the transition metal and, thus, lead to improvement of the electrocatalytic activity of perovskite catalysts. Among the different perovskite compositions, La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3</sub> exhibited the best ORR/OER activity, with a higher limiting current density, smaller Tafel slope, higher half-wave potential, lower overpotential, and lower potential difference than the other compositions. When La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3</sub> was applied as the cathodic catalyst in a primary ZAB, it delivered a peak power density of 81 mW cm<sup>−2</sup>. Additionally, in rechargeable ZABs, the La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3</sub> catalyst exhibited a lower voltage gap (0.94 V) and higher stability during charge–discharge cycling than the commonly used catalyst Pt/C. These results indicate that Ni-doped La<sub>0.6</sub>Sr<sub>0.4</sub>Co<sub>0.8</sub>Ni<sub>0.2</sub>O<sub>3</sub> is a promising bifunctional electrocatalyst for ZAB.https://www.mdpi.com/2073-4344/13/10/1366Ni dopingperovskitebifunctional electrocatalystoxygen reduction and evolution reactionZn-air battery |
| spellingShingle | Ronghua Yuan Weina Xu Liquan Pan Ruibin Li Chuanying Xiao Xiaochang Qiao Ni-Doped La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> Perovskite as an Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions in Alkaline Media Catalysts Ni doping perovskite bifunctional electrocatalyst oxygen reduction and evolution reaction Zn-air battery |
| title | Ni-Doped La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> Perovskite as an Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions in Alkaline Media |
| title_full | Ni-Doped La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> Perovskite as an Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions in Alkaline Media |
| title_fullStr | Ni-Doped La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> Perovskite as an Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions in Alkaline Media |
| title_full_unstemmed | Ni-Doped La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> Perovskite as an Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions in Alkaline Media |
| title_short | Ni-Doped La<sub>0.6</sub>Sr<sub>0.4</sub>CoO<sub>3</sub> Perovskite as an Efficient Electrocatalyst for Oxygen Reduction and Evolution Reactions in Alkaline Media |
| title_sort | ni doped la sub 0 6 sub sr sub 0 4 sub coo sub 3 sub perovskite as an efficient electrocatalyst for oxygen reduction and evolution reactions in alkaline media |
| topic | Ni doping perovskite bifunctional electrocatalyst oxygen reduction and evolution reaction Zn-air battery |
| url | https://www.mdpi.com/2073-4344/13/10/1366 |
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