Understanding Catalytic Activity Trends in the Oxygen Reduction Reaction

Kulkarni, Ambarish; Siahrostami, Samira; Patel, Anjli M.; Nørskov, Jens K.

doi:10.1021/acs.chemrev.7b00488

Cited by 1,935 publications

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References 123 publications

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“…[15] In order to address these challenges,t he development of conductive two-dimensional (2D) conjugated MOFs,i .e., atomically ordered, planar metal-organic networks extending in two dimensions with fully in-plane p-delocalization and weak out-of-plane p-p stacking is of great significance in electrocatalysis.This is due to their unique 2D features as well as improved electron transfer capacity and the high utilization of exposed active sites,inaddition to the inherent advantages of traditional MOFs. [25][26][27] Recently,aNi 3 (hexaiminotriphenylene) 2 2D MOF with Ni-N 4 active sites was demonstrated as an ORR electrocatalyst with an onset potential of 0.82 Vv s. RHE in alkaline media. [25][26][27] Recently,aNi 3 (hexaiminotriphenylene) 2 2D MOF with Ni-N 4 active sites was demonstrated as an ORR electrocatalyst with an onset potential of 0.82 Vv s. RHE in alkaline media.…”

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A Phthalocyanine‐Based Layered Two‐Dimensional Conjugated Metal–Organic Framework as a Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction

et al. 2019

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Layered two-dimensional (2D) conjugated metalorganic frameworks (MOFs) represent af amily of rising electrocatalysts for the oxygen reduction reaction (ORR), due to the controllable architectures,excellent electrical conductivity,a nd highly exposed well-defined molecular active sites. Herein, we report ac opper phthalocyanine based 2D conjugated MOF with square-planar cobalt bis(dihydroxy) complexes (Co-O 4 )a sl inkages (PcCu-O 8 -Co) and layer-stacked structures prepared via solvothermal synthesis.P cCu-O 8 -Co 2D MOF mixed with carbon nanotubes exhibits excellent electrocatalytic ORR activity (E 1/2 = 0.83 Vv s. RHE, n = 3.93, and j L = 5.3 mA cm À2 )i na lkaline media, which is the record value among the reported intrinsic MOF electrocatalysts. Supported by in situ Raman spectro-electrochemistry and theoretical modeling as well as contrast catalytic tests,w e identified the cobalt nodes as ORR active sites.F urthermore, when employed as ac athode electrocatalyst for zinc-air batteries,P cCu-O 8 -Co delivers am aximum power density of 94 mW cm À2 ,o utperforming the state-of-the-art Pt/C electrocatalysts (78.3 mW cm À2 ).Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

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A Phthalocyanine‐Based Layered Two‐Dimensional Conjugated Metal–Organic Framework as a Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction

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“…[14] Being acriticalfactor determining the catalytic activity, investigations on the mechanisms involved in the operation of such heteroatom-based active sites have received much attention in recent years. heteroatom-doping).…”

Section: Surface-enriched Active Sitesmentioning

confidence: 99%

Engineering the Interface of Carbon Electrocatalysts at the Triple Point for Enhanced Oxygen Reduction Reaction

Qiao

Titirici

2018

Chemistry A European J

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The aqueouso xygen reduction reaction( ORR) has recently received increased attention due to its critical role in clean and sustainable energy-generation technologies, such as proton exchange membranes (PEM) fuel cells, alkaline fuel cellsa nd Zn-airb atteries. The sluggishk inetics associated with ORR result from multistep electron-transfer process. The slow kinetics are partially related to the O 2 adsorption process onto the catalyst,w hich happens at the triple-phase boundary (TPB) of the electrocatalyst-electrolyte-oxygen interface. Hence, tremendous efforts have been devoted to improvingt he intrinsic properties of electrocatalysts such as active sites, electrical conductivity and porosity. Engineering the electrocatalyst's interfacial properties is an-other critical issue in ORR, however less described in the literature. The surface of the catalystp rovides the microenvironment for the triple boundary interface reaction, whichd irectly influences its electrocatalytic activity and the kinetics. This Minireview is as ummary of the existingl iterature on manipulating the interfacial surface of non-precious metal catalysts at the triple point between the solid catalyst, the aqueous electrolyte and the O 2 gas with the aim of improving the ORR efficiency.V arious approaches towards improving the wettability and nanostructuring the catalysts urface to boost the activity of the surface-active sites and provide improved stability are discussed. [a] M. Qiao, Prof. M.-M.Titirici

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“…However, their overall efficiency is severely limited by the sluggish oxygen reduction reaction (ORR), a key process in fuel cells and metal–air batteries . In the ORR, molecular oxygen is electrochemically reduced by a 4‐electron pathway to H 2 O (acidic media) or OH − (alkaline media), or by a 2‐electron pathway to H 2 O 2 (acidic media) or HO 2 − (alkaline media) as the intermediate species (Figure ) . Usually, as a consequence of the higher reaction kinetics and efficiency, the 4‐electron pathway is preferred.…”

Section: Introductionmentioning

confidence: 99%

Metal–Organic Frameworks Based Electrocatalysts for the Oxygen Reduction Reaction

et al. 2019

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In view of the clean and sustainable energy, metal–organic frameworks (MOFs) based materials, including pristine MOFs, MOF composites, and their derivatives are emerging as unique electrocatalysts for oxygen reduction reaction (ORR). Thanks to their tunable compositions and diverse structures, efficient MOF‐based materials provide new opportunities to accelerate the sluggish ORR at the cathode in fuel cells and metal–air batteries. This Minireview first provides some introduction of ORR and MOFs, followed by the classification of MOF‐based electrocatalysts towards ORR. Recent breakthroughs in engineering MOF‐based ORR electrocatalysts are highlighted with an emphasis on synthesis strategy, component, morphology, structure, electrocatalytic performance, and reaction mechanism. Finally, some current challenges and future perspectives for MOF‐based ORR electrocatalysts are also discussed.

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Understanding Catalytic Activity Trends in the Oxygen Reduction Reaction

Cited by 1,935 publications

References 123 publications

A Phthalocyanine‐Based Layered Two‐Dimensional Conjugated Metal–Organic Framework as a Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction

A Phthalocyanine‐Based Layered Two‐Dimensional Conjugated Metal–Organic Framework as a Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction

Engineering the Interface of Carbon Electrocatalysts at the Triple Point for Enhanced Oxygen Reduction Reaction

Metal–Organic Frameworks Based Electrocatalysts for the Oxygen Reduction Reaction

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