Photodeposited IrO2 on TiO2 support as a catalyst for oxygen evolution reaction

Димитрова, Нина; Banti, Angeliki; Spyridou, O.-N.; Papaderakis, Α.; Georgieva, J.; Sotiropoulos, S.; Valova, E.; Armyanov, S.; Tatchev, Dragomir; Hubin, Annick; Baert, Kitty

doi:10.1016/j.jelechem.2021.115720

Cited by 9 publications

(11 citation statements)

References 66 publications

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“…Nonetheless, the photodeposition process has found application in the synthesis of noble metal/semiconductor compounds in different research areas, such as photocatalytic water splitting, 28,29 wastewater treatment, 30 and air purification. 31 While first successes about photodeposited iridium oxide on TiO2 are reported, 32 they are still scarce in the context of PEMWE. Albeit this demonstrates the general applicability of photodeposition to this research field, neither a continuous shell was achieved so far, nor was the catalyst characterized on PEMWE single-cell level.…”

Section: Introductionmentioning

confidence: 99%

Scalable Synthesis of TiO2@IrOx Core-Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading

Hoffmeister,

Finger,

Fiedler

et al. 2024

Preprint

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The widespread application of green hydrogen production technologies requires cost reduction of crucial elements. To achieve this, a viable pathway to reduce the iridium loading in proton exchange membrane water electrolysis (PEMWE) is explored. Herein, we present a scalable synthesis method based on a photodeposition process for a TiO2@IrOx core-shell catalyst with a reduced iridium content as low as 40 wt%. Using this synthesis route, we obtain titania support particles homogeneously coated with a thin iridium oxide shell of only 2.1 ± 0.4 nm. The catalyst exhibits not only high ex situ activity, but also decent stability compared to commercially available catalysts. Furthermore, the unique core-shell structure provides a threefold increased electrical powder conductivity compared to structures without the shell. In addition, the low iridium content facilitates the fabrication of sufficiently thick catalyst layers at decreased iridium loadings mitigating the impact of crack formation in the catalyst layer during PEMWE operation. We demonstrate that the novel TiO2@IrOx core-shell catalyst clearly outperforms the commercial reference in single-cell tests with an iridium loading below 0.3 mgIr cm 2 exhibiting a superior iridium-specific power density of 17.9 kW gIr-1 compared to 10.4 kW gIr-1 for the commercial reference.

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Section: Introductionmentioning

confidence: 99%

Scalable Synthesis of TiO2@IrOx Core-Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading

Hoffmeister,

Finger,

Fiedler

et al. 2024

Preprint

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“…The results showed that the IrO 2 − TiO 2 composite containing 25 wt % Ir has high catalytic activity for the OER in water electrolysis compared to commercial catalytic materials (IrO 2 ). 28 Oakton et al used the Adams fusion method to synthesize the IrO 2 −TiO 2 composite. The composites containing 40 mol % of Ir (55 wt %) have improved catalytic performance for the OER and enhanced durability compared with commercial catalysts (Umicore).…”

Section: Introductionmentioning

confidence: 99%

“…Iridium oxide (IrO 2 ) is a highly stable, corrosion-resistant, and electrically conductive material that has been used as an oxygen evolution reaction (OER) catalyst in electrochemical water electrolysis. − Many reports demonstrated that using IrO 2 was one of the most effective ways for enhancing the electrical conductivity of TiO 2 . − Iridium oxide–titanium oxide (IrO 2 –TiO 2 ) composites were synthesized by various methods, such as the hydrothermal method, sol–gel synthesis, deposition–precipitation, Adams fusion, , photodeposition, colloidal synthesis, and pyrolysis . Dimitrova et al reported the synthesis of IrO 2 –TiO 2 composites by photodeposition of IrO 2 nanoparticles from an Ir salt solution on the surface of TiO 2 powder using ultraviolet illumination.…”

Section: Introductionmentioning

confidence: 99%

“…Dimitrova et al reported the synthesis of IrO 2 –TiO 2 composites by photodeposition of IrO 2 nanoparticles from an Ir salt solution on the surface of TiO 2 powder using ultraviolet illumination. The results showed that the IrO 2 –TiO 2 composite containing 25 wt % Ir has high catalytic activity for the OER in water electrolysis compared to commercial catalytic materials (IrO 2 ) . Oakton et al.…”

Section: Introductionmentioning

confidence: 99%

“…20−22 Many reports demonstrated that using IrO 2 was one of the most effective ways for enhancing the electrical conductivity of TiO 2 . 22−25 Iridium oxide−titanium oxide (IrO 2 −TiO 2 ) composites were synthesized by various methods, such as the hydrothermal method, 23 sol−gel synthesis, 24 deposition−precipitation, 25 Adams fusion, 26,27 photodeposition, 28 colloidal synthesis, 29 and pyrolysis. 30 an Ir salt solution on the surface of TiO 2 powder using ultraviolet illumination.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Flame-Made Ir–IrO₂/TiO₂ Particles as Anode Catalyst Support for Improved Durability in Polymer Electrolyte Fuel Cells

Ho,

Hirano,

Narui

et al. 2023

ACS Appl. Energy Mater.

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The development of metal oxide support with high electrical conductivity has attracted attention to improving the durability and performance of polymer electrolyte fuel cells. Iridium oxide–titanium oxide particles are outstanding candidates, owing to their excellent properties. In this study, catalyst support comprising titanium oxide particles with low-loading iridium–iridium oxide species (Ir–IrO2/TiO2) with a chain-like structure was synthesized by a flame aerosol process. The flame aerosol process is a versatile and one-step method allowing the production of metal-loaded metal oxide particles with a low amount of precious metal. The effect of the Ir loading contents on the morphology and electrical conductivity of the synthesized particles was investigated. The volume resistivity of Ir–IrO2/TiO2 particles containing 10 wt % IrO2 (Ir–IrO2/TiO2-10) (0.95 Ω cm) was much lower than that of TiO2 particles (108 Ω cm), which demonstrates the improvement of the conductivity of TiO2 particles resulting from the Ir loading. The electrochemical surface area of 20 wt % Pt-loaded Ir–IrO2/TiO2-10 particles was 42 m2 g–1-Pt, and Pt nanoparticles were distributed homogeneously on the Ir–IrO2/TiO2 particle surface. The performance of a membrane electrode assembly (MEA) based on the developed Ir–IrO2/TiO2 catalyst support as an anode shows no significant differences compared to that of MEA based on a carbon-supported Pt catalyst. MEA prepared from the Ir–IrO2/TiO2-10 particles exhibited remarkable stability after 20 min testing at a voltage of 1.7 V, whereas the cell potential of a carbon-supported Pt catalyst decreased dramatically under the same conditions.

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Photodeposition‐Based Synthesis of TiO₂@IrO_x Core–Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading

Hoffmeister,

Finger,

Fiedler

et al. 2024

Advanced Science

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The widespread application of green hydrogen production technologies requires cost reduction of crucial elements. To achieve this, a viable pathway to reduce the iridium loading in proton exchange membrane water electrolysis (PEMWE) is explored. Herein, a scalable synthesis method based on a photodeposition process for a TiO2@IrOx core–shell catalyst with a reduced iridium content as low as 40 wt.% is presented. Using this synthesis method, titania support particles homogeneously coated with a thin iridium oxide shell of only 2.1 ± 0.4 nm are obtained. The catalyst exhibits not only high ex situ activity, but also decent stability compared to commercially available catalysts. Furthermore, the unique core–shell structure provides a threefold increased electrical powder conductivity compared to structures without the shell. In addition, the low iridium content facilitates the fabrication of sufficiently thick catalyst layers at decreased iridium loadings mitigating the impact of crack formation in the catalyst layer during PEMWE operation. It is demonstrated that the novel TiO2@IrOx core–shell catalyst clearly outperforms the commercial reference in single‐cell tests with an iridium loading below 0.3 mgIr cm−2 exhibiting a superior iridium‐specific power density of 17.9 kW gIr−1 compared to 10.4 kW gIr−1 for the commercial reference.

show abstract

Photodeposited IrO2 on TiO2 support as a catalyst for oxygen evolution reaction

Cited by 9 publications

References 66 publications

Scalable Synthesis of TiO2@IrOx Core-Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading

Scalable Synthesis of TiO2@IrOx Core-Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading

Flame-Made Ir–IrO₂/TiO₂ Particles as Anode Catalyst Support for Improved Durability in Polymer Electrolyte Fuel Cells

Photodeposition‐Based Synthesis of TiO₂@IrO_x Core–Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading

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Photodeposited IrO2 on TiO2 support as a catalyst for oxygen evolution reaction

Cited by 9 publications

References 66 publications

Scalable Synthesis of TiO2@IrOx Core-Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading

Scalable Synthesis of TiO2@IrOx Core-Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading

Flame-Made Ir–IrO2/TiO2 Particles as Anode Catalyst Support for Improved Durability in Polymer Electrolyte Fuel Cells

Photodeposition‐Based Synthesis of TiO2@IrOx Core–Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading

Contact Info

Product

Resources

About

Flame-Made Ir–IrO₂/TiO₂ Particles as Anode Catalyst Support for Improved Durability in Polymer Electrolyte Fuel Cells

Photodeposition‐Based Synthesis of TiO₂@IrO_x Core–Shell Catalyst for Proton Exchange Membrane Water Electrolysis with Low Iridium Loading