ChemInform Abstract: Graphene‐Supported Substoichiometric Sodium Tantalate as a Methanol‐Tolerant, Non‐Noble‐Metal Catalyst for the Electroreduction of Oxygen.

Sebastián, David; Baglio, Vincenzo; Sun, Shuhui; Tavares, Ana C.; Aricò, A.S.

doi:10.1002/chin.201526015

Cited by 2 publications

(4 citation statements)

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“…All catalysts investigated in this study (Na 2 where GP stands for the thermally reduced graphene oxide support) and their respective synthesis parameters are summarized in Table S2, Supporting Information. The main phase in these catalysts consists of a sub-stoichiometric sodium tantalate (Na 2 Ta 8 O 21−x , x ≈ 6) 27,28 which is characterized by a high number of oxygen vacancies while showing excellent chemical and electrochemical stability in the acid environment. The other phases are obtained through specific treatments and, to a certain extent, they behave as ORR promoters by the effect of a synergistic mechanism.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…This has not been reported yet for Ta-based oxides or oxynitrides catalysts in both acid and alkaline media. [16,18,[21][22][23][24][25][26][27][28][29][30]35] Furthermore, this catalyst shows excellent activity in alkaline medium almost reaching the activity of a commercial 20% Pt/C catalyst.…”

Section: Electrochemical Performance and Stabilitymentioning

confidence: 99%

“…Oxygen reduction reaction (ORR) is one of the most important reactions in renewable energy conversion of defects such as oxygen vacancies. [12,[19][20][21][22] As illustrated in Table S1, Supporting Information, [16,18,[21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] the activity of this class of materials is still low, that is, they require high overpotential even to achieve a modest current density, and do not reach the limiting current value expected for the reduction of oxygen to water by the four-electron pathway:…”

Section: Introductionmentioning

confidence: 99%

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Engineering of a Low‐Cost, Highly Active, and Durable Tantalate–Graphene Hybrid Electrocatalyst for Oxygen Reduction

Zhang

Sebastián

Zhang

et al. 2020

Advanced Energy Materials

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and storage devices, such as fuel cells and metal-air batteries. [1][2][3][4][5][6][7][8] Especially, the polymer electrolyte membrane fuel cells, used in automotive applications, have already achieved the level of commercialization. [5] Although the Pt group metal (PGM) catalysts can efficiently address the kinetics-related challenges, the high cost and the limited resource of PGM greatly hinder the widespread commercialization of these energy conversion and storage devices. Therefore, the development of low-cost, highly active, and stable PGM-free catalysts, to replace the PGM ones, toward ORR, is highly desired. Over the past decades, extensive research was devoted to the development of alternative and low-cost catalysts, including i) non-precious Fe and Co-based metal catalysts, [3,4,[9][10][11] ii) metal oxides, nitrides, and oxynitrides, [12][13][14] and iii) metal-free catalysts such as carbon-based materials. [15] Oxides from metals belonging to groups 4 and 5 (Ti, V, Zr, Nb, Hf, Ta) have attracted interest in these fields, mainly due to their low cost compared to PGM catalysts, environmental compatibility, and excellent stability in acid medium. [12,[16][17][18][19] It has been demonstrated that these oxides can have some activity toward ORR, if their stoichiometry is conveniently tailored to generate a high concentration The oxygen reduction reaction (ORR) is one of the most important reactions in renewable energy conversion and storage devices. The full deployment of these devices depends on the development of highly active, stable, and low-cost catalysts. Herein, a new hybrid material consisting of Na 2 Ta 8 O 21−x / Ta 2 O 5 /Ta 3 N 5 nanocrystals grown on N-doped reduced graphene oxide is reported. This catalyst shows a significantly enhanced ORR activity by ≈4 orders of magnitude in acidic media and by ≈2 orders of magnitude in alkaline media compared to individual Na 2 Ta 8 O 21−x on graphene. Moreover, it has excellent stability in both acid and alkaline media. It also has much better methanol tolerance than the commercial Pt/C, which is relevant to methanol fuel cells. The high ORR activity arises not only from the synergistic effect among the three Ta phases, but also from the concomitant nitrogen doping of the reduced graphene oxide nanosheets. A correlation between ORR activity and nitrogen content is demonstrated. Deep insights into the mechanism of the synergistic effect among these three Ta-based phases, which boosts the ORR's kinetics, are acquired by combining specific experiments and density functional theory calculations.

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Section: Synthesis and Characterizationmentioning

confidence: 99%

Section: Electrochemical Performance and Stabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Engineering of a Low‐Cost, Highly Active, and Durable Tantalate–Graphene Hybrid Electrocatalyst for Oxygen Reduction

Zhang

Sebastián

Zhang

et al. 2020

Advanced Energy Materials

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“…Pt and its alloys are most well studied and active electrode for ORR [202][203][204][205][206] . Additionally, nonprecious metals compounds which are composed of non-precious metal and nitrogen-contained organic compounds are also promising electrocatalysts for ORR [156,[207][208][209][210] . Carbon-based materials, such nanostructured carbons, graphene, CNTs, as well as their heteroatoms (N, B, P, S,O)-doped compounds [211][212][213][214] have been strongly considered for ORR.…”

Section: Oxygen Electrochemistrymentioning

confidence: 99%

Nanostructured energy materials for electrochemical energy conversion and storage: A review

Zhang

Cheng

Zhang

2016

Journal of Energy Chemistry

426

185

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ChemInform Abstract: Graphene‐Supported Substoichiometric Sodium Tantalate as a Methanol‐Tolerant, Non‐Noble‐Metal Catalyst for the Electroreduction of Oxygen.

Cited by 2 publications

References 1 publication

Engineering of a Low‐Cost, Highly Active, and Durable Tantalate–Graphene Hybrid Electrocatalyst for Oxygen Reduction

Engineering of a Low‐Cost, Highly Active, and Durable Tantalate–Graphene Hybrid Electrocatalyst for Oxygen Reduction

Nanostructured energy materials for electrochemical energy conversion and storage: A review

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