The bifunctional electrocatalytic activity of perovskite La0.6Sr0.4CoO3−δ for oxygen reduction and evolution reactions

Oh, Min; Jeon, Jeong Sook; Lee, Jong Ju; Kim, Pil; Nahm, Kee Suk

doi:10.1039/c4ra16097e

Cited by 57 publications

(40 citation statements)

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“…It is crucial to utilize highly efficient catalysts to promote the ORR/OER process. So far, many metals, metal oxides, carbonaceous materials and redox media have been reported as cathode catalysts in Li-O 2 batteries678910. The noble metal and noble metal oxide nanoparticles are usually the highly efficient catalyst, however, the high cost of the noble metals have limited their large-scale applications1112.…”

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confidence: 99%

Electrocatalytic performances of g-C3N4-LaNiO3 composite as bi-functional catalysts for lithium-oxygen batteries

Wang

Zhang

et al. 2016

Sci Rep

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A low cost and non-precious metal composite material g-C3N4-LaNiO3 (CNL) was synthesized as a bifunctional electrocatalyst for the air electrode of lithium-oxygen (Li-O2) batteries. The composition strategy changed the electron structure of LaNiO3 and g-C3N4, ensures high Ni3+/Ni2+ ratio and more absorbed hydroxyl on the surface of CNL that can promote the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The composite catalyst presents higher activities than the individual components g-C3N4 and LaNiO3 for both ORR and OER. In non-aqueous Li-O2 batteries, CNL shows higher capacity, lower overpotentials and better cycling stability than XC-72 carbon and LaNiO3 catalysts. Our results suggest that CNL composite is a promising cathode catalyst for Li-O2 batteries.

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confidence: 99%

Electrocatalytic performances of g-C3N4-LaNiO3 composite as bi-functional catalysts for lithium-oxygen batteries

Wang

Zhang

et al. 2016

Sci Rep

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“…The perovskite oxide SrCo 0.8 Cu 0.1 Nb 0.1 O 3− δ was synthesized through a Pechini method, similar to the synthesis of SrFe 0.8 Cu 0.1 Nb 0.1 O 3− δ . All the chemical precursors, ammonium niobate(V) oxalate hydrate, C 4 H 4 NNbO 9 ⋅ x H 2 O (99.99 %, Sigma Aldrich, x =6.7), Sr(NO 3 ) 2 (98 %, Alfa Aesar), Co(NO 3 ) 2 ⋅6 H 2 O (97.7 % min, Alfa Aesar), and Cu(NO 3 ) 2 ⋅2.5 H 2 O (98 %, Alfa Aesar), were directly dissolved in deionized water to prepare a mixed solution.…”

Section: Methodsmentioning

confidence: 99%

“…The perovskite oxide SrCo 0.8 Cu 0.1 Nb 0.1 O 3Àd was synthesized through aP echini method, [37] similar to the synthesis of SrFe 0.8 Cu 0.1 Nb 0.1 -O 3Àd . [30] , with am olar ratio of 1.2:1 of citric acid to the total molar of metal ions, was added into the mixed solution.…”

Section: Methodsmentioning

confidence: 99%

Investigation of Perovskite Oxide SrCo_0.8Cu_0.1Nb_0.1O_3–δ as a Cathode Material for Room Temperature Direct Ammonia Fuel Cells

et al. 2019

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Single‐phase perovskite oxide SrCo 0.8 Cu 0.1 Nb 0.1 O 3– δ was synthesized using a Pechini method. X‐ray diffraction (XRD) analysis indicated a cubic structure with a =3.8806(7) Å. The oxide material was combined with active carbon, forming a composite electrode to be used as the cathode in a room temperature ammonia fuel cell based on an anion membrane electrolyte and NiCu/C anode. An open circuit voltage (OCV) of 0.19 V was observed with dilute 0.02 m (340 ppm) ammonia solution as the fuel. The power density and OCV were improved upon the addition of 1 m NaOH to the fuel, suggesting that the addition of NaOH, which could be achieved through the introduction of alkaline waste to the fuel stream, could improve performance when wastewater is used as the fuel. It was found that the SrCo 0.8 Cu 0.1 Nb 0.1 O 3− δ cathode was converted from irregular shape into shuttle‐shape during the fuel cell measurements. As the key catalysts for electrode materials for this fuel cell are all inexpensive, after further development, this could be a promising technology for removal of ammonia from wastewater.

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“…[27] In addition to increasing the catalyst surface area, another promising strategy for improving perovskite oxides catalytic activity is to modify their electronic structures through doping. The substitution of a divalent alkali metal (hole-doping) [21,[28][29][30][31] or a tetravalent metal ion (electron-doping) [32,33] in the A site of perovskite oxides can regulate the oxidation state of the transition metal and create structural defects leading to oxygen vacancies or excesses, thereby improving the overall electrocatalytic performance. While hole-doping of La 3 + by Sr 2 + has been proven to effectively improve the OER/ORR activities of LaCoO 3 , [21,28] Bockris et al [32] and Otagawa et al [33] have proposed that electron-doping of La 3 + by Ce 4 + could achieve even better OER activity.…”

Section: Introductionmentioning

confidence: 99%

3DOM Cerium Doped LaCoO₃Bifunctional Electrocatalysts for the Oxygen Evolution and Reduction Reactions

2021

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A bifunctional oxygen evolution reaction and oxygen reduction reaction (OER/ORR) electrocatalyst, macroporous cerium-doped LaCoO 3 , was designed based on a dual strategy that included (1) constructing a three-dimensionally ordered macroporous (3DOM) structure to increase the electrochemical surface area and (2) varying amount of cerium substitution from 0.02 to 0.15 mole fraction of the A site to alter the intrinsic activity of LaCoO 3 . The catalytic activity of 3DOM La 0.95 Ce 0.05 CoO 3 (3DOM LCCO-0.05) is significantly improved over that of the unmodified LaCoO 3 , with the OER overpotential to reach 10 mA cm À 2 lowered by 190 mV, the ORR limiting current density doubled, and the OER-ORR potential gap reduced by 220 mV to 1.07 V. This enhanced activity is attributed to the increased electrochemical surface area and specific activity, as evidenced by the greater double-layer capacitances and the lower charge transfer resistances determined by electrochemical impedance spectroscopy (EIS). Furthermore, X-ray diffraction (XRD) and X-ray photospectroscopy (XPS) results reveal that these enhanced OER/ORR activities are possibly related to the transformation of the cobalt(III) spin state from low to intermediate or high-spin, and the increasing amount of surface oxygen species and oxygen vacancies.

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The bifunctional electrocatalytic activity of perovskite La_0.6Sr_0.4CoO_3−δ for oxygen reduction and evolution reactions

Abstract: The perovskite LSC exhibited better catalytic performance than conventionally used KB and improved the reversibility of the O2 electrode.

Cited by 57 publications

References 50 publications

Electrocatalytic performances of g-C3N4-LaNiO3 composite as bi-functional catalysts for lithium-oxygen batteries

Electrocatalytic performances of g-C3N4-LaNiO3 composite as bi-functional catalysts for lithium-oxygen batteries

Investigation of Perovskite Oxide SrCo_0.8Cu_0.1Nb_0.1O_3–δ as a Cathode Material for Room Temperature Direct Ammonia Fuel Cells

3DOM Cerium Doped LaCoO₃Bifunctional Electrocatalysts for the Oxygen Evolution and Reduction Reactions

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The bifunctional electrocatalytic activity of perovskite La0.6Sr0.4CoO3−δ for oxygen reduction and evolution reactions

Abstract: The perovskite LSC exhibited better catalytic performance than conventionally used KB and improved the reversibility of the O2 electrode.

Cited by 57 publications

References 50 publications

Electrocatalytic performances of g-C3N4-LaNiO3 composite as bi-functional catalysts for lithium-oxygen batteries

Electrocatalytic performances of g-C3N4-LaNiO3 composite as bi-functional catalysts for lithium-oxygen batteries

Investigation of Perovskite Oxide SrCo0.8Cu0.1Nb0.1O3–δ as a Cathode Material for Room Temperature Direct Ammonia Fuel Cells

3DOM Cerium Doped LaCoO3Bifunctional Electrocatalysts for the Oxygen Evolution and Reduction Reactions

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About

The bifunctional electrocatalytic activity of perovskite La_0.6Sr_0.4CoO_3−δ for oxygen reduction and evolution reactions

Investigation of Perovskite Oxide SrCo_0.8Cu_0.1Nb_0.1O_3–δ as a Cathode Material for Room Temperature Direct Ammonia Fuel Cells

3DOM Cerium Doped LaCoO₃Bifunctional Electrocatalysts for the Oxygen Evolution and Reduction Reactions