Electrocatalytic oxygen evolution on reactively sputtered electrochromic iridium oxide films

Beni, G.; Schiavone, L. M.; Shay, J. L.; Dautremont‐Smith, W. C.; Schneider, B. S.

doi:10.1038/282281a0

Cited by 126 publications

(95 citation statements)

References 11 publications

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“…13 Additionally, various types of iridium oxide films have been previously shown to be electrochromic, with the most active prepared by the sputtering technique.…”

Section: Introductionmentioning

confidence: 99%

Anodic deposition of a robust iridium-based water-oxidation catalyst from organometallic precursors

et al. 2011

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“…13 Additionally, various types of iridium oxide films have been previously shown to be electrochromic, with the most active prepared by the sputtering technique.…”

Section: Introductionmentioning

confidence: 99%

Anodic deposition of a robust iridium-based water-oxidation catalyst from organometallic precursors

et al. 2011

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“…Due to these characteristic features, IrO 2 has been investigated for electrocatalytic applications such as water splitting, [1][2][3] pH sensing, 4,5 and amperometric biosensing; 6,7 however, its high cost and limited abundance require the most-efficient utilization of IrO 2 possible. 8,9 To enhance the electrocatalytic activity of IrO 2 at a low cost, IrO 2 catalyst is designed into a nanostructure.…”

mentioning

confidence: 99%

“…The advantageous features of iridium oxide (IrO 2 ) include a high stability with exceptional resolution and corrosion resistances, reversible redox properties, and a sound biocompatibility for use in implantable devices. Due to these characteristic features, IrO 2 has been investigated for electrocatalytic applications such as water splitting, [1][2][3] pH sensing, 4,5 and amperometric biosensing; 6,7 however, its high cost and limited abundance require the most-efficient utilization of IrO 2 possible. 8,9 To enhance the electrocatalytic activity of IrO 2 at a low cost, IrO 2 catalyst is designed into a nanostructure.…”

mentioning

confidence: 99%

Iridium Oxide Dendrite as a Highly Efficient Dual Electro-Catalyst for Water Splitting and Sensing of H₂O₂

Kim

Cho

Lee

2016

J. Electrochem. Soc.

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The synthesis and electrocatalytic performance of iridium-oxide (IrO 2 ) are reported. IrO 2 was electrochemically deposited on the gold dendrite template prepared by the chronoamperometry. The influence of the synthetic condition on the morphology, phase composition, and accessible surface area of the IrO 2 dendrites was investigated. The optimized IrO 2 dendrites showed an excellent electrocatalytic activity toward oxygen evolution with a low overpotential of 240 mV at 5 mAcm −2 and to the sensing of hydrogen peroxide with a high sensitivity of 692. The advantageous features of iridium oxide (IrO 2 ) include a high stability with exceptional resolution and corrosion resistances, reversible redox properties, and a sound biocompatibility for use in implantable devices. Due to these characteristic features, IrO 2 has been investigated for electrocatalytic applications such as water splitting, [1][2][3] pH sensing, 4,5 and amperometric biosensing; 6,7 however, its high cost and limited abundance require the most-efficient utilization of IrO 2 possible. 8,9 To enhance the electrocatalytic activity of IrO 2 at a low cost, IrO 2 catalyst is designed into a nanostructure. The structurally controlled IrO 2 catalyst can provide a large and accessible active surface area, and it facilitates electro-and mass transport. For these reasons, several researchers have developed the IrO 2 nanostructures in different ways. Electrodeposited IrO 2 nanoparticles for pH sensing were reported by Kim et al. 4 The preparation of IrO 2 nanofibers using electrospinning technique, and their application in ascorbic acid sensor electrode with binder was reported by Kim et al. 6 Sun et al. prepared IrO 2 nanorods using a CdSe/CdS/TiO 2 -nanorod template at 480• C. 10 With the use of a colloidal-SiO 2 template and heat-treatment, macroporous IrO 2 was prepared by Hu et al. 11 The reported IrO 2 structures were prepared via complex processes at high annealing temperatures or with the use of a template that required a multi-step preparation.As is well known, a dendrite structure, consisting of a main stem and numerous side branches, receives significant attention as a catalyst and other technological fields. The large surface area, short diffusion length, and sound mechanical integrity of the dendrite can provide both an extraordinarily high activated surface and a robust stability that are due to the micro-and nano-sized assemblies.12-15 To directly synthesize a metal dendrite on a conductive substrate, electrodeposition can be easily employed without any post-treatment at room temperature.Here, we introduce a simple method to achieve IrO 2 dendrite; the gold dendrite was prepared on titanium (Ti) foil using a facile electrodeposition (ED), and IrO 2 was then electrochemically deposited on the gold dendrite. There are only a few studies on the IrO 2 dendrite in the literature. The dendritic structure of IrO 2 was well controlled by the electrodeposition cycle number. An optimized IrO 2 electrode was applied to the electrocatalytic application f...

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“…It was reported that HIROF is not stable at relevant PEMWE potentials of 1.4 to 1.6 V RHE . 27 Danilovic et al 28 compared amorphous and crystalline metal oxides regarding their trends in activity and stability. According to these authors very active oxides are prone for dissolution and a compromise is required.…”

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confidence: 99%

Activity and Stability of Electrochemically and Thermally Treated Iridium for the Oxygen Evolution Reaction

Geiger

Kasian

Shrestha

et al. 2016

J. Electrochem. Soc.

173

174

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Iridium is the main element in modern catalysts for the oxygen evolution reaction (OER) in proton exchange membrane water electrolyzers (PEMWE), which is predominantly due to its relatively good activity and tolerable stability in harsh PEMWE conditions. Limited abundance of iridium, however, poses limitations on widespread applications of these devices, in particular in the large scale conversion and storage of renewable energy. In this work we investigate if the electrocatalytic performance of iridium can be fine-tuned by thermal treatment of catalysts at different temperatures. The OER activity and the dissolution of two different iridium electrodes, viz. (a) flat metallic iridium surfaces prepared by electron beam physical vapor deposition (EBPVD) and (b) electrochemically prepared porous hydrous iridium oxide films (HIROF) are studied. The range of applied annealing temperatures is 100 • C-600 • C, with a general trend of decreasing activity and increasing stability the higher the temperature. Numerous peculiarities in the trend are however observed. These are discussed considering variations of oxide structure, morphology and electronic conductivity.

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Electrocatalytic oxygen evolution on reactively sputtered electrochromic iridium oxide films

Cited by 126 publications

References 11 publications

Anodic deposition of a robust iridium-based water-oxidation catalyst from organometallic precursors

Anodic deposition of a robust iridium-based water-oxidation catalyst from organometallic precursors

Iridium Oxide Dendrite as a Highly Efficient Dual Electro-Catalyst for Water Splitting and Sensing of H₂O₂

Activity and Stability of Electrochemically and Thermally Treated Iridium for the Oxygen Evolution Reaction

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Electrocatalytic oxygen evolution on reactively sputtered electrochromic iridium oxide films

Cited by 126 publications

References 11 publications

Anodic deposition of a robust iridium-based water-oxidation catalyst from organometallic precursors

Anodic deposition of a robust iridium-based water-oxidation catalyst from organometallic precursors

Iridium Oxide Dendrite as a Highly Efficient Dual Electro-Catalyst for Water Splitting and Sensing of H2O2

Activity and Stability of Electrochemically and Thermally Treated Iridium for the Oxygen Evolution Reaction

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Iridium Oxide Dendrite as a Highly Efficient Dual Electro-Catalyst for Water Splitting and Sensing of H₂O₂