Investigation of supported IrO2 as electrocatalyst for the oxygen evolution reaction in proton exchange membrane water electrolyser

Puthiyapura, Vinod Kumar; Pasupathi, Sivakumar; Su, Huaneng; Liu, Xiaoteng; Pollet, Bruno G.; Scott, Keith

doi:10.1016/j.ijhydene.2013.11.056

Cited by 99 publications

(71 citation statements)

References 23 publications

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“…Another established approach is a dispersion of the Ir‐based OER catalyst on a nanostructured support, which potentially results in a much larger active surface area for a given amount of catalyst than could be achieved by a solid compact structure . TiO 2 ‐supported IrO 2 has been used for years as dimensionally stable electrodes (DSA) in chlorine‐alkali electrolysis and in the state of the art PEM electrolysis .…”

Section: Introductionmentioning

confidence: 99%

Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony‐Doped Tin Oxide Support

Böhm

Beetz

Schuster

et al. 2019

Adv Funct Materials

113

105

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A multistep synthesis procedure for the homogeneous coating of a complex porous conductive oxide with small Ir nanoparticles is introduced to obtain a highly active electrocatalyst for water oxidation. At first, inverse opal macroporous Sb doped SnO 2 (ATO) microparticles with defined pore size, composition, and open-porous morphology are synthesized that reach a conductivity of ≈3.6 S cm −1 and are further used as catalyst support. ATO-supported iridium catalysts with a controlled amount of active material are prepared by solvothermal reduction of an IrO x colloid in the presence of the porous ATO particles, whereby homogeneous coating of the complete outer and inner surface of the particles with nanodispersed metallic Ir is achieved. Thermal oxidation leads to the formation of ATO-supported IrO 2 nanoparticles with a void volume fraction of ≈89% calculated for catalyst thin films based on scanning transmission electron microscope tomography data and microparticle size distribution. A remarkably low Ir bulk density of ≈0.08 g cm −3 for this supported oxide catalyst architecture with 25 wt% Ir is determined. This highly efficient oxygen evolution reaction catalyst reaches a current density of 63 A g Ir −1 at an overpotential of 300 mV versus reversible hydrogen electrode, significantly exceeding a commercial TiO 2 -supported IrO 2 reference catalyst under the same measurement conditions.

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Section: Introductionmentioning

confidence: 99%

Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony‐Doped Tin Oxide Support

Böhm

Beetz

Schuster

et al. 2019

Adv Funct Materials

113

105

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“…The most commonly used electrocatalyst for ORR is Pt-based materials, [7][8][9] which are not efficient for OER due to the formation of PtO x on the catalyst surface during operation. [10] IrO 2 is regarded as the most active electrocatalyst for OER [11,12] while has no activity toward ORR. Besides, the high cost due to the non-earth-abundancy of these materials and the decreasing activity under the operation conditions also thwarts their large-scale applications in reality.…”

Section: Introductionmentioning

confidence: 99%

Cation Deficiency Tuning of LaCoO₃ Perovskite as Bifunctional Oxygen Electrocatalyst

et al. 2020

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Oxygen electrocatalysis, including both oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), dominates the performance of various electrochemical energy conversion and storage systems. However, the practical applications of these devices are limited as a result of the sluggish kinetics of OER and ORR as well as the high cost and instability of the state-of-the-art noble metal catalyst used in these systems. In this study, cation deficiency is introduced to the A-site of perovskite LaCoO 3 synthesized via polymer-assisted approach to enhance the electrocatalytic activity of both OER and ORR, leading to the boosted bifunctionality of the resultant electrocatalysts, which might be attributed to oxygen vacancy introduction in perovskites. The bifunctionality of the A-site deficiency perovskite (ΔE = 0.948 V) is comparable or even better than the pristine LaCoO 3 (ΔE = 1.063 V) as well as the reported state-of-the-art electrocatalysts, including both perovskites and noble metal electrocatalysts. The stability test also indicates their good stability under alkaline solutions, suggesting that the as-prepared materials can be good candidates as bifunctional electrocatalysts in oxygen-based electrochemical devices, such as fuel cells and metal-air batteries. This work introduces the A-site cation deficiency strategy to improve the bifunctional electrocatalytic performance of perovskites, and highlights the facile polymer-assisted approach for perovskites synthesis.[a] Dr.

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“…Achieving the latter is directly related to the development of sufficiently stable and conductive supports. To increase the utilization, Ir has been supported with stable and conductive oxides such as antimony tin oxide (ATO), indium tin oxide (ITO), titanium oxynitride (TiON x ), etc [13][14][15][16][17]. In addition to the better distribution of Ir on the support's surface, the overall activity can sometimes also be affected by the strong metal-support interaction (SMSI) [18,19].…”

Section: Introductionmentioning

confidence: 99%

Ir/TiON_x/C high-performance oxygen evolution reaction nanocomposite electrocatalysts in acidic media: synthesis, characterization and electrochemical benchmarking protocol

et al. 2020

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More efficient utilization of iridium is of immense importance for the future development of proton exchange membrane electrolyzers. In this study, we introduce a new facile and scalable synthesis of an Ir-based high-performance oxygen evolution reaction (OER) electrocatalytic nanocomposite. The composite consists of Ir nanoparticles with an average size of 3-4 nm, which are effectively anchored on a titanium oxynitride support (TiON x ), which is distributed across high-surface-area Ketjen Black carbon (Ir/TiON x /C). We provide complete structural, morphological and compositional characterization (x-ray diffraction, scanning transmission electron microscopy and energy-dispersive x-ray spectroscopy) and propose a proper benchmark protocol to measure true electrochemical performance. Compared to the state-of-the-art Ir Black electrocatalyst, Ir/TiON x /C exhibits approximately three times higher OER performance.

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Investigation of supported IrO2 as electrocatalyst for the oxygen evolution reaction in proton exchange membrane water electrolyser

Cited by 99 publications

References 23 publications

Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony‐Doped Tin Oxide Support

Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony‐Doped Tin Oxide Support

Cation Deficiency Tuning of LaCoO₃ Perovskite as Bifunctional Oxygen Electrocatalyst

Ir/TiON_x/C high-performance oxygen evolution reaction nanocomposite electrocatalysts in acidic media: synthesis, characterization and electrochemical benchmarking protocol

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Investigation of supported IrO2 as electrocatalyst for the oxygen evolution reaction in proton exchange membrane water electrolyser

Cited by 99 publications

References 23 publications

Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony‐Doped Tin Oxide Support

Efficient OER Catalyst with Low Ir Volume Density Obtained by Homogeneous Deposition of Iridium Oxide Nanoparticles on Macroporous Antimony‐Doped Tin Oxide Support

Cation Deficiency Tuning of LaCoO3 Perovskite as Bifunctional Oxygen Electrocatalyst

Ir/TiONx/C high-performance oxygen evolution reaction nanocomposite electrocatalysts in acidic media: synthesis, characterization and electrochemical benchmarking protocol

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Product

Resources

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Cation Deficiency Tuning of LaCoO₃ Perovskite as Bifunctional Oxygen Electrocatalyst

Ir/TiON_x/C high-performance oxygen evolution reaction nanocomposite electrocatalysts in acidic media: synthesis, characterization and electrochemical benchmarking protocol