IrO<sub>2</sub> Coated on RuO<sub>2</sub> as Efficient and Stable Electroactive Nanocatalysts for Electrochemical Water Splitting

Audichon, Thomas; Napporn, Têko W.; Canaff, Christine; Morais, Cláudia; Comminges, Clément; Kokoh, K. Boniface

doi:10.1021/acs.jpcc.5b11868

Cited by 425 publications

(260 citation statements)

References 58 publications

(111 reference statements)

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“…This has motivated researchers to develop high performance, lowc ost and sustainable electrochemical energy sources such as fuel cells, supercapacitor andL i-ion batteries. [4,5] However,t heir scarcity,i nferior durability and excessive cost, limit their use in large-scale industrial applications. [3] Therefore, there is high demandf or an efficient electrocatalyst which can increase the rate of OER at lower overpotential.…”

Section: Introductionmentioning

confidence: 99%

Isostructural Ni^II Metal–Organic Frameworks (MOFs) for Efficient Electrocatalysis of Oxygen Evolution Reaction and for Gas Sorption Properties

Konavarapu

Ghosh

Dey

et al. 2019

Chemistry A European J

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Design ands ynthesis of stable, active and cost-effective electrocatalystf or water splitting applicationsi sa n emerging area of research, given thed epletion of fossil fuels. Herein, two isostructuralN i II redox-activem etal-organic frameworks (MOFs) containing flexible tripodal trispyridyl ligand (L)a nd linear dicarboxylates such as terephthalate (TA) and 2-aminoterphthalate (H 2 NTA) are studied fort heir catalytic activity in oxygen evaluation reaction( OER). The 2D-layered MOFs form 3D hydrogen bonded frameworks containing one-dimensional hydrophilic channels that are filled with water molecules. The electrochemical studies reveal that MOFs display an efficient catalytic activity towards oxygen evolutionr eactioni na lkaline conditions with an overpotential as low as 356 mV.F urther,t hese 2D-MOFs exhibit excellenta bility to adsorb water vapor (180-230 cc g À1 at 273 K) and CO 2 (33 cc g À1 at 273 K). The presence of hydrophilic functionality in the frameworks was found to significantly enhancet he electrocatalytic activity as well as H 2 Os orption.Supporting information and the ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.

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Section: Introductionmentioning

confidence: 99%

Isostructural Ni^II Metal–Organic Frameworks (MOFs) for Efficient Electrocatalysis of Oxygen Evolution Reaction and for Gas Sorption Properties

Konavarapu

Ghosh

Dey

et al. 2019

Chemistry A European J

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confidence: 99%

Unraveling Geometrical Site Confinement in Highly Efficient Iron‐Doped Electrocatalysts toward Oxygen Evolution Reaction

Hung

Hsu

Chang

et al. 2017

Advanced Energy Materials

132

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to develop OER electrocatalysts with a low overpotential in order to scale down the energy expenditure of water electrolysis.To date, noble metal oxides, such as iridium oxide and ruthenium oxide, are regarded as the benchmarked OER electrocatalysts, [10][11][12][13] but their scarcity and high cost hinder them from the wide utilization. [14] For these reasons, it is of the essence to explore earth-abundant substances showing comparable performance as costly noble-metal electrocatalysts. Recently, earth-abundant transition-metalbased materials exhibited high performance and superb stability toward OER, especially for the cobalt and nickel-based oxides/nonoxides. [15][16][17][18][19][20][21][22] Furthermore, various metal dopants would greatly affect the activities and intrinsic attributes. For example, tungsten, chromium, iron, and zinc-doping have been discovered to improve the activities in contrast to pristine metal oxides owing to the optimization of adsorption energy for surface intermediates or the increment of roughness factor. [23][24][25][26][27][28][29] Interestingly, among these elements, iron can commonly perform significant enhancement in catalytic activities toward oxygen evolution reaction as compared to other elements. [30,31] Boettcher's group proposed that Fe ions granted the catalytic activities while Co ions acted as the conductive oxides to transport the charge carriers in an Fe-Co metal oxide system. [32] Friebel et al. conducted a series of operando experiments and calculations to demonstrate that Fe ions in Ni 1-x Fe x OOH system would alter the adsorption energies of OER intermediates over the electrocatalytic surface and thus reduce the overpotential of OER, whereas the formation of low-activity FeOOH declined the resulting activities in the cases of higher Fe content. [33] Howbeit, the behavior of iron based on the material insight was not elaborated. Toward this end, it is crucial to establish the direct relationship between the material characteristics and the catalytic activities.Recently, we reported that the geometrical sites in spinel cobalt oxide served distinct functions. In the case of Co 3 O 4 , the cobalt ions in octahedral site (Co 3+ (Oh) ) contributed to surface double layer capacitance while those in tetrahedral site (Co 2+ (Td) ) were able to adsorb oxygen ions onto the surface for being the active species. [34,35] It suggested that even for the identical Introduction of iron in various catalytic systems has served a crucial function to significantly enhance the catalytic activity toward oxygen evolution reaction (OER), but the relationship between material properties and catalysis is still elusive. In this study, by regulating the distinctive geometric sites in spinel, Fe occupies the octahedral sites (Fe 3+ (Oh) ) and confines Co to the tetrahedral site (Co 2+ (Td) ), resulting in a strikingly high activity (η j = 10 mA cm −2 = 229 mV and η j = 100 mA cm −2 = 281 mV). Further enrichment of Fe ions would occupy the tetrahedral sites to decline the amount of Co 2+ (Td) a...

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“…RuO 2 is a very active OER catalyst, although it suffers from a stability defect (it dissolves approximately 2 orders of magnitude faster than IrO 2 ). The work of IrO 2 @RuO 2 core‐shell material, as another type composite, shows enhanced activity comparing to RuO 2 and IrO 2 . Namely, IrO 2 @RuO 2 core‐shell material with a catalyst loading of 0.38 mg cm −2 achieved 10.8 mA cm −2 at 1.5 V, and its Tafel slope was 57.8 mV dec −1 .…”

Section: Resultsmentioning

confidence: 97%

Effective Strain Engineering of IrO₂ Toward Improved Oxygen Evolution Catalysis through a Catalyst‐Support System

et al. 2019

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A template‐free, one‐step synthesis of nano‐IrO2 on a layered Mn−Co birnessite support was developed to induce the catalyst‐support interaction. The IrO2 nanoparticles were prepared with inherent crystal lattice strain, which is derived from the Ir‐O−Mn mismatch at the interface. The oxidation state of iridium is higher than IrIV, revealing the electron transfer to the substrate. On account of the crystal lattice distortion and electronic manipulations being favorable to the oxygen evolution reaction (OER), the as‐synthesized composite exhibited excellent OER activity and stability. The improved catalytic nature was followed by enhancement in the electrochemical active surface area, mass specific activity, and intrinsic activity. Moreover, the Tafel slope of 42 mV dec−1 reveals better reaction kinetics for IrO2/Mn−Co (2 : 1)‐birnessite than many previously reported catalysts despite the low precious noble metal content in the as‐synthesized composite. Conclusively, we have proven that the strain engineering holds vital importance in forming catalyst‐support interaction and rational design of catalysts.

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IrO₂ Coated on RuO₂ as Efficient and Stable Electroactive Nanocatalysts for Electrochemical Water Splitting

Cited by 425 publications

References 58 publications

Isostructural Ni^II Metal–Organic Frameworks (MOFs) for Efficient Electrocatalysis of Oxygen Evolution Reaction and for Gas Sorption Properties

Isostructural Ni^II Metal–Organic Frameworks (MOFs) for Efficient Electrocatalysis of Oxygen Evolution Reaction and for Gas Sorption Properties

Unraveling Geometrical Site Confinement in Highly Efficient Iron‐Doped Electrocatalysts toward Oxygen Evolution Reaction

Effective Strain Engineering of IrO₂ Toward Improved Oxygen Evolution Catalysis through a Catalyst‐Support System

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IrO2 Coated on RuO2 as Efficient and Stable Electroactive Nanocatalysts for Electrochemical Water Splitting

Cited by 425 publications

References 58 publications

Isostructural NiII Metal–Organic Frameworks (MOFs) for Efficient Electrocatalysis of Oxygen Evolution Reaction and for Gas Sorption Properties

Isostructural NiII Metal–Organic Frameworks (MOFs) for Efficient Electrocatalysis of Oxygen Evolution Reaction and for Gas Sorption Properties

Unraveling Geometrical Site Confinement in Highly Efficient Iron‐Doped Electrocatalysts toward Oxygen Evolution Reaction

Effective Strain Engineering of IrO2 Toward Improved Oxygen Evolution Catalysis through a Catalyst‐Support System

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IrO₂ Coated on RuO₂ as Efficient and Stable Electroactive Nanocatalysts for Electrochemical Water Splitting

Isostructural Ni^II Metal–Organic Frameworks (MOFs) for Efficient Electrocatalysis of Oxygen Evolution Reaction and for Gas Sorption Properties

Isostructural Ni^II Metal–Organic Frameworks (MOFs) for Efficient Electrocatalysis of Oxygen Evolution Reaction and for Gas Sorption Properties

Effective Strain Engineering of IrO₂ Toward Improved Oxygen Evolution Catalysis through a Catalyst‐Support System