Graphene-Based Non-Noble-Metal Catalysts for Oxygen Reduction Reaction in Acid

Byon, Hye Ryung; Suntivich, Jin; Shao‐Horn, Yang

doi:10.1021/cm2000649

Cited by 435 publications

(291 citation statements)

References 65 publications

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“…The efficiency of Li-air batteries, to some extent, is limited by the slow kinetics of the oxygen reduction reaction (ORR) and the OER (22,(33)(34)(35)(36)(37)(38)(39)(40)(41)(42)(43). To assess their ORR and OER catalytic activity, our materials were first loaded (with the same mass loading) onto glassy carbon electrodes.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical mesoporous perovskite La ₀ _.5 Sr _0.5 CoO _2.91 nanowires with ultrahigh capacity for Li-air batteries

Zhao

Mai

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

318

151

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Lithium-air batteries have captured worldwide attention due to their highest energy density among the chemical batteries. To provide continuous oxygen channels, here, we synthesized hierarchical mesoporous perovskite La 0.5 Sr 0.5 CoO 2.91 (LSCO) nanowires. We tested the intrinsic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activity in both aqueous electrolytes and nonaqueous electrolytes via rotating disk electrode (RDE) measurements and demonstrated that the hierarchical mesoporous LSCO nanowires are high-performance catalysts for the ORR with low peak-up potential and high limiting diffusion current. Furthermore, we fabricated Li-air batteries on the basis of hierarchical mesoporous LSCO nanowires and nonaqueous electrolytes, which exhibited ultrahigh capacity, ca. over 11,000 mAh·g -1 , one order of magnitude higher than that of LSCO nanoparticles. Besides, the possible reaction mechanism is proposed to explain the catalytic activity of the LSCO mesoporous nanowire. electrocatalysis | energy storage W ith the growth of energy demand, searching for new clean energy sources to replace conventional fuel energy has been a challenge today (1-6). Li-ion batteries have developed rapidly in recent years because of their low cost, long cycle life, good reversibility, and no memory effect. However, even when it was fully developed, the highest energy storage of Li-ion batteries is insufficient to satisfy the ever-increasing requirements for batteries with high capacities (7,8). Recently, Li-air batteries have attracted great interest because they potentially have much higher gravimetric energy storage density compared with all other chemical batteries (9-18). They could theoretically offer very high specific energies (i.e., 5,000 Wh·kg −1 ) because oxygen, the cathode active material, is not stored in the battery, but can be accessed from the environment. Thus, Li-air batteries are eco-friendly electrochemical power sources.However, there are some challenges in Li-air battery research. In an aprotic electrolyte, the fundamental cathode discharge reactions are thought to be 2Li + O 2 → Li 2 O 2 and 2Li + 0.5O 2 → Li 2 O. Recent studies demonstrated the degradation of the electrolyte (19,20), and the precipitation of reaction products Li 2 O 2 / Li 2 O or electrolyte decomposition products on the catalyst and electrode eventually blocked the oxygen pathway and limited the capacity of the Li-air batteries.To enhance the performance, it has been suggested that one method for enhancing the mobility of oxygen ions is to provide disorder-free channels of oxygen vacancies, using compounds with the perovskite structure that exhibits cation ordering (21,22). It is well known that perovskite materials have wide applications in catalysis for fuel cells and metal-air batteries due to their defective structures and excellent oxygen mobility. Shao-Horn and coworkers have deeply studied perovskite oxides for oxygen evolution reaction (OER) catalysis and found that Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-x and La 0.5 C...

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Section: Resultsmentioning

confidence: 99%

Hierarchical mesoporous perovskite La ₀ _.5 Sr _0.5 CoO _2.91 nanowires with ultrahigh capacity for Li-air batteries

Zhao

Mai

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

318

151

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“…It is clear the N1 and N2 predominate among the nitrogen species, which may be responsible for the ORR active sites [28,46]. The pyridine-N assignment have two edge carbon atoms bond to it, with a lone pair of electrons, often observed on the edge of graphite plane.…”

Section: Surface Analysismentioning

confidence: 99%

Nitrogen-doped carbon xerogel as high active oxygen reduction catalyst for direct methanol alkaline fuel cell

Liu

Zhang

et al. 2012

International Journal of Hydrogen Energy

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“…For instance, FeN 4 G, CoN 4 G, NiN 4 G, and MnN 4 G have been applied for the oxygen reduction reaction (ORR) applications. [23][24][25][26] Later, the possible use of FeN 4 G as a catalyst for NO reduction via the (NO) 2 adsorption mechanism was suggested by the periodic DFT method. 27 Very recently, water dissociation on MN 4 G (M ¼ Mg, Ba, Ti) was theoretically studied by Liu et al 28 They showed that Mg, Ba, Ti are energetically stable on the surface and TiN 4 G displayed promising catalytic properties for H 2 O dissociation.…”

Section: -17mentioning

confidence: 99%

Silicon-coordinated nitrogen-doped graphene as a promising metal-free catalyst for N₂O reduction by CO: a theoretical study

et al. 2018

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Metal-free catalysts for the transformation of N 2 O and CO into green products under mild conditions have long been expected. The present work proposes using silicon-coordinated nitrogen-doped graphene (SiN 4 G) as a catalyst for N 2 O reduction and CO oxidation based on periodic DFT calculations. The reaction proceeds via two steps, which are N 2 O reduction at the Si reaction center, producing Si-O*, which subsequently oxidizes CO to CO 2 . The N 2 O reduction occurs with an activation energy barrier of 0.34 eV, while the CO oxidation step requires an energy of 0.66 eV. The overall reaction is highly exothermic, with a reaction energy of À3.41 eV, mostly due to the N 2 generation step. Compared to other metal-free catalysts, SiN 4 G shows the higher selectivity because it not only strongly prefers to adsorb N 2 O over CO, but the produced N 2 and CO 2 are easily desorbed, which prevents the poisoning of the active catalytic sites. These results demonstrate that SiN 4 G is a promising metal-free catalyst for N 2 O reduction and CO oxidation under mild conditions, as the reaction is both thermodynamically and kinetically favorable.

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Graphene-Based Non-Noble-Metal Catalysts for Oxygen Reduction Reaction in Acid

Cited by 435 publications

References 65 publications

Hierarchical mesoporous perovskite La ₀ _.5 Sr _0.5 CoO _2.91 nanowires with ultrahigh capacity for Li-air batteries

Hierarchical mesoporous perovskite La ₀ _.5 Sr _0.5 CoO _2.91 nanowires with ultrahigh capacity for Li-air batteries

Nitrogen-doped carbon xerogel as high active oxygen reduction catalyst for direct methanol alkaline fuel cell

Silicon-coordinated nitrogen-doped graphene as a promising metal-free catalyst for N₂O reduction by CO: a theoretical study

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Graphene-Based Non-Noble-Metal Catalysts for Oxygen Reduction Reaction in Acid

Cited by 435 publications

References 65 publications

Hierarchical mesoporous perovskite La 0 .5 Sr 0.5 CoO 2.91 nanowires with ultrahigh capacity for Li-air batteries

Hierarchical mesoporous perovskite La 0 .5 Sr 0.5 CoO 2.91 nanowires with ultrahigh capacity for Li-air batteries

Nitrogen-doped carbon xerogel as high active oxygen reduction catalyst for direct methanol alkaline fuel cell

Silicon-coordinated nitrogen-doped graphene as a promising metal-free catalyst for N2O reduction by CO: a theoretical study

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Hierarchical mesoporous perovskite La ₀ _.5 Sr _0.5 CoO _2.91 nanowires with ultrahigh capacity for Li-air batteries

Hierarchical mesoporous perovskite La ₀ _.5 Sr _0.5 CoO _2.91 nanowires with ultrahigh capacity for Li-air batteries

Silicon-coordinated nitrogen-doped graphene as a promising metal-free catalyst for N₂O reduction by CO: a theoretical study