Constructing Nanoporous Ir/Ta<sub>2</sub>O<sub>5</sub> Interfaces on Metallic Glass for Durable Acidic Water Oxidation

Qiao, Yijing; Luo, Min; Cai, Lebin; Kao, Cheng‐wei; Lan, Jiao; Meng, Linghu; Lu, Ying‐Rui; Peng, Ming; Ma, Chao; Tan, Yongwen

doi:10.1002/smll.202305479

Cited by 11 publications

(3 citation statements)

References 55 publications

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“…As shown in Figure S25a, compared with fresh Ir−MnCo 2 O 4.5 , the peak position of Ir L 3 shifts to a higher energy after the long-term CP test, indicating that single Ir atoms gradually oxidized during the continuous OER process. 16,42 This phenomenon is consistent with the results observed by XPS. The corresponding Fourier transformed EXAFS spectrum is shown in Figure S25b.…”

Section: Resultssupporting

confidence: 92%

“…By normalization to the Ir loading at 1.50 V, the mass activity (MA) of integrated Ir–MnCo 2 O 4.5 is 57, which is 7 times greater than that of Com IrO 2 . Compared with previously reported OER catalysts, − integrated Ir–MnCo 2 O 4.5 shows comparable MA (Table S9). In addition to MA, the lower overpotential and Tafel slope (Figure e and Table S10) make the integrated Ir–MnCo 2 O 4.5 electrocatalyst an ideal candidate for the OER.…”

Section: Resultsmentioning

confidence: 59%

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Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Hua,

Li,

Rui

et al. 2024

ACS Catal.

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Industrial water electrolysis requires oxygen evolution reaction (OER) catalysts that exhibit both high activity and adaptability to high current densities. However, single Ir atoms of the OER catalysts often show high performance in the three-electrode system but are limited to low current densities in proton exchange membrane water electrolyzers (PEMWE). The high oxidation potential and catalyst shedding caused by oxygen bubble desorption have hindered the stability, resulting in unsatisfactory PEMWE performance. Achieving high catalytic stability under high current density conditions still presents a significant challenge for all of the OER catalysts. In this study, an efficient and stable catalytic system for OER is constructed by a doping strategy, which consists of atomically dispersed Ir sites in MnCo 2 O 4.5 . The integrated Ir−MnCo 2 O 4.5 catalyst demonstrates remarkable OER activity, with a low overpotential of 238 mV at 10 mA/cm 2 . It exhibits long-term stability, maintaining this high activity for 700 h at 20 mA/cm 2 with a degradation rate of 0.025 mV/h. Impressively, the PEMWE with the integrated Ir− MnCo 2 O 4.5 as the anode remains stable even after nearly 100 h at 200 mA/cm 2 , outperforming most previously reported singleiridium atom-based PEMWEs. Density functional theory calculations show that the redistribution of charges brought by the introduction of Ir and Mn not only effectively reduces the dissolution of lattice oxygen and Ir active sites but also lowers the energy barrier of the rate-determining step, thereby significantly improving the stability and activity of Ir−MnCo 2 O 4.5 under high current density.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 59%

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Hua,

Li,

Rui

et al. 2024

ACS Catal.

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“…3 helps to stabilize the oxidation state of Ir. Tan et al reported nanoporous Ir/Ta 2 O 5 catalysts for acidic OER, in which the electron-donating behavior of Ta 2 O 5 stabilized the high oxidation states of Ir and optimized the adsorption of OOH* intermediates on Ir sites during OER, thereby achieving high activity and stability 50. Liu et al synthesized a W 18 O 49−δ matrix-confined Ru solid solution oxide catalyst that exhibited good stability in acidic conditions for OER 51.…”

mentioning

confidence: 99%

Carbon-Encapsulated Ru–Co₃O₄ Nanosheets as Electrocatalysts for Acidic Water Oxidation

Liu,

Guo,

et al. 2024

ACS Appl. Nano Mater.

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Developing stable and highly active electrocatalysts for the oxygen evolution reaction (OER) in acidic media holds significant importance for proton-exchange membrane water electrolysis. Here, we report a carbon-protected, low Ru-doped cobalt oxide nanosheet array electrode (C−Ru−Co 3 O 4 ) for acid OER. The doping of Ru adjusts the electronic structure, optimizing the adsorption of reaction intermediates. Additionally, amorphous carbon, derived from polydopamine, effectively inhibits the overoxidation of Ru−Co 3 O 4 . Furthermore, the sheetlike structure and strong interplay between the catalyst and support promote mass and charge transfer while extending the long-term durability. Compared to Co 3 O 4 and commercial RuO 2 catalysts, C−Ru−Co 3 O 4 catalyst exhibits enhanced OER performance and stability. The optimized catalyst shows an overpotential of 252 mV at 10 mA cm −2 and can operate continuously in acidic media for more than 30 h, while the activity of commercial RuO 2 sharply decreases within 1 h. Notably, C−Ru−Co 3 O 4 also exhibits good hydrogen evolution reaction (HER) activity, with an overpotential of 125 mV at 10 mA cm −2 . Furthermore, the acid water splitting electrolyzer, based on bifunctional C−Ru−Co 3 O 4 , can be effectively driven by a solar panel, revealing its potential for converting solar energy into clean chemical energy.

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Supported IrO₂ Nanocatalyst with Multilayered Structure for Proton Exchange Membrane Water Electrolysis

Wang,

Zhao,

Liang

et al. 2024

Advanced Materials

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The design of a low‐iridium‐loading anode catalyst layer with high activity and durability is a key challenge for a proton exchange membrane water electrolyzer (PEMWE). Here, the synthesis of a novel supported IrO2 nanocatalyst with a tri‐layered structure, dubbed IrO2@TaOx@TaB that is composed of ultrasmall IrO2 nanoparticles anchored on amorphous TaOx overlayer of TaB nanorods is reported. The composite electrocatalyst shows great activity and stability toward the oxygen evolution reaction (OER) in acid, thanks to its dual‐interface structural feature. The electronic interaction in IrO2/TaOx interface can regulate the coverage of surface hydroxyl groups, the Ir3+/ Ir4+ ratio, and the redox peak potential of IrO2 for enhancing OER activity, while the dense TaOx overlayer can prevent further oxidation of TaB substrate and stabilize the IrO2 catalytic layers for improving structural stability during OER. The IrO2@TaOx@TaB can be used to fabricate an anode catalyst layer of PEMWE with an iridium‐loading as low as 0.26 mg cm−2. The low‐iridium‐loading PEMWE delivers high current densities at low cell voltages (e.g., 3.9 A cm−2@2.0 V), and gives excellent activity retention for more than 1500 h at 2.0 A cm−2 current density.

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Constructing Nanoporous Ir/Ta₂O₅ Interfaces on Metallic Glass for Durable Acidic Water Oxidation

Cited by 11 publications

References 55 publications

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Carbon-Encapsulated Ru–Co₃O₄ Nanosheets as Electrocatalysts for Acidic Water Oxidation

Supported IrO₂ Nanocatalyst with Multilayered Structure for Proton Exchange Membrane Water Electrolysis

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Constructing Nanoporous Ir/Ta2O5 Interfaces on Metallic Glass for Durable Acidic Water Oxidation

Cited by 11 publications

References 55 publications

Integrating Atomically Dispersed Ir Sites in MnCo2O4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Integrating Atomically Dispersed Ir Sites in MnCo2O4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Carbon-Encapsulated Ru–Co3O4 Nanosheets as Electrocatalysts for Acidic Water Oxidation

Supported IrO2 Nanocatalyst with Multilayered Structure for Proton Exchange Membrane Water Electrolysis

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Constructing Nanoporous Ir/Ta₂O₅ Interfaces on Metallic Glass for Durable Acidic Water Oxidation

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Integrating Atomically Dispersed Ir Sites in MnCo₂O_4.5 for Highly Stable Acidic Oxygen Evolution Reaction

Carbon-Encapsulated Ru–Co₃O₄ Nanosheets as Electrocatalysts for Acidic Water Oxidation

Supported IrO₂ Nanocatalyst with Multilayered Structure for Proton Exchange Membrane Water Electrolysis