Enhanced Activity and Stability of TiO<sub>2</sub>-Coated Cobalt/Carbon Catalysts for Electrochemical Water Oxidation

Kim, Hyung Ju; Jackson, David H. K.; Lee, Jechan; Guan, Yingxin; Kuech, T. F.; Huber, George W.

doi:10.1021/acscatal.5b00173

Cited by 48 publications

(36 citation statements)

References 62 publications

(98 reference statements)

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“…Therefore, it would be highly desirable to stabilize inexpensive supported non-sulfide base-metal catalysts for the aqueous-phase processes. We have recently reported that base-metal catalysts can be stabilized by overcoating with a layer of Al 2 O 3 or TiO 2 using atomic layer deposition (ALD) [28][29][30]. An Al 2 O 3 overcoat formed by ALD stabilized the copper particles against leaching and sintering for liquid-phase hydrogenation reactions [28].…”

Section: Introductionmentioning

confidence: 99%

Stabilizing cobalt catalysts for aqueous-phase reactions by strong metal-support interaction

Lee

Burt

Carrero

et al. 2015

Journal of Catalysis

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115

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a b s t r a c tHigh-temperature calcination and reduction treatments of cobalt particles (17-20 nm) supported on TiO 2 create cobalt particles covered with a TiO y layer. The layer thickness ranges from 2.8 to 4.0 nm. These phenomena, commonly called strong metal-support interaction (SMSI), can be used to improve the catalyst stability and change the catalyst selectivity. For example, non-overcoated cobalt catalysts leached during aqueous-phase hydrogenation (APH) of furfuryl alcohol, losing 44.6% of the cobalt after 35 h time-on-stream. In contrast, TiO y -overcoated cobalt catalysts did not lose any measurable cobalt by leaching and the cobalt particle size remained constant after 105 h time-on-stream. The 1,5-pentanediol selectivity from furfuryl alcohol hydrogenolysis increased with increasing TiO y layer thickness. The stabilized cobalt catalyst also had high yields for APH of xylose to xylitol (99%) and APH of furfural to furfuryl alcohol (95%). These results show that the SMSI effect produces a catalyst with a similar structure as catalysts prepared by atomic layer deposition, thereby opening up a cheaper and more industrially relevant method of stabilizing base-metal catalysts for aqueous-phase biomass conversion reactions. In addition, the SMSI effect can be used to tune catalyst selectivity, thus allowing the more precise atomic scale design of supported metal catalysts.

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Section: Introductionmentioning

confidence: 99%

Stabilizing cobalt catalysts for aqueous-phase reactions by strong metal-support interaction

Lee

Burt

Carrero

et al. 2015

Journal of Catalysis

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115

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“…The porous structures of carbon and zeolite supports enable a high electrochemical surface area ( ECSA ) to be achieved for the electrocatalysts, which results in higher activity, though they have lower electrical conductivities than metal supports, which thereby reduces their overall efficiency . Further, the high electronegativity of carbon promotes acidity in the catalyst sites . To alleviate the problem of low electrical conductivity, the use of metal supports has been suggested –.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Water Oxidation Activity of the Cobalt(II,III) Oxide Electrocatalyst on an Earth‐Abundant‐Metal‐Interlayered Hybrid Porous Carbon Support

et al. 2016

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Supports over which electrocatalysts are deposited play a crucial role in the oxygen evolution reaction (OER), because they influence the surface roughness, morphology, electronic structure, and conductivity of electrocatalysts. In this context, we designed a hybrid carbon support having an earth‐abundant metal as an interlayer between a Co3O4 electrocatalyst and a carbon support. The present approach resulted in an electrode that was three dimensional with high porosity, provided low resistance to parallel electron conduction pathways through the metallic interlayer, and modulated the electrocatalytic activity of Co3O4 by affecting its electronic structure. To rationalize the effect of the metal interlayer, a range of non‐noble earth‐abundant metals (e.g. Cu, Mo, Ti, Al) were explored, of which the Cu‐modified carbon support resulted in maximum specific activity (i.e. activity per electrochemical surface area) for the OER. Whereas both the electronegativity and conductivity of the metal interlayer were found to influence the OER activity, the dominant controlling factor in the explored systems was conductivity. The specific activity of the OER of electrodeposited Co3O4 was found to have a near‐linear relationship between the electrical conductivity and the electron‐donor metals (e.g. Ti, Al) and another near‐linear relationship having different intercepts with electron‐acceptor metals (e.g. Cu, Mo, W). The above understanding can be useful in increasing the OER activity of electrocatalysts through support–electrocatalyst interactions.

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“…Deposition of several layers of TiO 2 onto a surface of a Co/C composite significantly decreased the overpotential necessary to gain −10 mA cm −2 current density for HER, but also improved the stability of the composite in time. [ 58 ] Similar approach was used to protect an Al‐doped ZnO electrocatalyst. [ 59 ] The base of the composite was deposited using diethylzinc, trimethylaluminum, and water at 175 °C.…”

Section: Hydrogen Evolution Reactionmentioning

confidence: 99%

Applications of Atomic Layer Deposition in Design of Systems for Energy Conversion

Plutnar

Pumera

2021

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There is a huge demand for clean energy conversion in all industries. The clean energy production processes include electrocatalytic and photocatalytic conversion of water to hydrogen, carbon dioxide reduction, nitrogen conversion to ammonia, and oxygen reduction reaction and require novel cheap and efficient photo‐ and electrocatalysts and their scalable methods of fabrication. Atomic layer deposition is a thin film deposition method that allows to deposit thin layers of catalysts on virtually any surface of any shape, size, and porosity in an even and easy to control manner. Here the state of the art in applications of atomic layer deposition in the clean energy production and the opportunities it represents for the whole field of the photo‐ and electrocatalysis for a sustainable future are reviewed.

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Enhanced Activity and Stability of TiO₂-Coated Cobalt/Carbon Catalysts for Electrochemical Water Oxidation

Cited by 48 publications

References 62 publications

Stabilizing cobalt catalysts for aqueous-phase reactions by strong metal-support interaction

Stabilizing cobalt catalysts for aqueous-phase reactions by strong metal-support interaction

Enhanced Water Oxidation Activity of the Cobalt(II,III) Oxide Electrocatalyst on an Earth‐Abundant‐Metal‐Interlayered Hybrid Porous Carbon Support

Applications of Atomic Layer Deposition in Design of Systems for Energy Conversion

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Enhanced Activity and Stability of TiO2-Coated Cobalt/Carbon Catalysts for Electrochemical Water Oxidation

Cited by 48 publications

References 62 publications

Stabilizing cobalt catalysts for aqueous-phase reactions by strong metal-support interaction

Stabilizing cobalt catalysts for aqueous-phase reactions by strong metal-support interaction

Enhanced Water Oxidation Activity of the Cobalt(II,III) Oxide Electrocatalyst on an Earth‐Abundant‐Metal‐Interlayered Hybrid Porous Carbon Support

Applications of Atomic Layer Deposition in Design of Systems for Energy Conversion

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Enhanced Activity and Stability of TiO₂-Coated Cobalt/Carbon Catalysts for Electrochemical Water Oxidation