Spinel-type NiCo2O4 with abundant oxygen vacancies as a high-performance catalyst for the oxygen reduction reaction
Spinel-type nickel cobaltite with numerous oxygen vacancies is successfully synthesized by hydrothermal and thermal reduction using hydrogen. The effects of oxygen vacancies on the electrochemical activity and stability for the oxygen reduction reaction are investigated. The prepared catalyst displa...
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| Published in: | International journal of hydrogen energy Vol. 44; no. 42; pp. 23775 - 23783 |
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| Main Authors: | , , , , , |
| Format: | Journal Article |
| Language: | English |
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Elsevier Ltd
03-09-2019
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| Abstract | Spinel-type nickel cobaltite with numerous oxygen vacancies is successfully synthesized by hydrothermal and thermal reduction using hydrogen. The effects of oxygen vacancies on the electrochemical activity and stability for the oxygen reduction reaction are investigated. The prepared catalyst displays significantly enhanced oxygen reduction reaction (ORR) catalytic performance under alkaline conditions, which is comparable to that of commercial Pt/C. The oxygen-deficient NiCo2O4 exhibits a very high limiting current density of −5.44 mA cm−2 with onset and half-wave potentials of 0.93 and 0.78 V versus the reversible hydrogen electrode (RHE), respectively. Additionally, it shows excellent durability and resistance to methanol. The enhanced ORR activity and stability of the catalyst can be ascribed to the synergistic effects of the relatively large electrochemical surface area, more exposed active sites, and good electrical conductivity derived from abundant oxygen vacancies.
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•NiCo2O4 nanoparticles with oxygen vacancies were synthesized by a hydrothermal method followed by mild H2 reduction.•The H2-treated NiCo2O4 exhibited a low overpotential and substantial long-term stability for oxygen reduction reaction.•This outstanding ORR performance and stability can be attributed to the improved physicochemical properties by H2 treatment. |
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| AbstractList | Spinel-type nickel cobaltite with numerous oxygen vacancies is successfully synthesized by hydrothermal and thermal reduction using hydrogen. The effects of oxygen vacancies on the electrochemical activity and stability for the oxygen reduction reaction are investigated. The prepared catalyst displays significantly enhanced oxygen reduction reaction (ORR) catalytic performance under alkaline conditions, which is comparable to that of commercial Pt/C. The oxygen-deficient NiCo2O4 exhibits a very high limiting current density of −5.44 mA cm−2 with onset and half-wave potentials of 0.93 and 0.78 V versus the reversible hydrogen electrode (RHE), respectively. Additionally, it shows excellent durability and resistance to methanol. The enhanced ORR activity and stability of the catalyst can be ascribed to the synergistic effects of the relatively large electrochemical surface area, more exposed active sites, and good electrical conductivity derived from abundant oxygen vacancies.
[Display omitted]
•NiCo2O4 nanoparticles with oxygen vacancies were synthesized by a hydrothermal method followed by mild H2 reduction.•The H2-treated NiCo2O4 exhibited a low overpotential and substantial long-term stability for oxygen reduction reaction.•This outstanding ORR performance and stability can be attributed to the improved physicochemical properties by H2 treatment. |
| Author | Lim, Dongwook Kong, Hyungseok Baeck, Sung-Hyeon Lim, Chaewon Kim, Namil Shim, Sang Eun |
| Author_xml | – sequence: 1 givenname: Dongwook surname: Lim fullname: Lim, Dongwook – sequence: 2 givenname: Hyungseok surname: Kong fullname: Kong, Hyungseok – sequence: 3 givenname: Chaewon surname: Lim fullname: Lim, Chaewon – sequence: 4 givenname: Namil surname: Kim fullname: Kim, Namil – sequence: 5 givenname: Sang Eun surname: Shim fullname: Shim, Sang Eun – sequence: 6 givenname: Sung-Hyeon orcidid: 0000-0002-3565-5774 surname: Baeck fullname: Baeck, Sung-Hyeon email: shbaeck@inha.ac.kr |
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| Keywords | NiCo2O4 Spinel structure Oxygen reduction reaction Oxygen vacancy |
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| Title | Spinel-type NiCo2O4 with abundant oxygen vacancies as a high-performance catalyst for the oxygen reduction reaction |
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