Nanoporous PdIr alloy for high-efficiency and durable water splitting in acidic media

Shi, Jinyue; Kao, Cheng-Wei; Lan, Jiao; Kang, Jun‐Gill; Peng, Ming; Luo, Ming; Lu, Ying‐Rui; Zhang, Shiguo; Tan, Yongwen

doi:10.1039/d3ta01280h

Cited by 13 publications

(7 citation statements)

References 47 publications

(54 reference statements)

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“…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: Resultssupporting

confidence: 92%

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%

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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“…3a), which corroborates the analysis results obtained from XPS. 43 The Fourier-transformed extended X-ray absorption fine structure (EXAFS) spectra ( R -space) of the catalysts, displayed in Fig. 3b, reveal the existence of Pt–Pt coordination in both As-spun Pt and Pt/MG.…”

Section: Resultsmentioning

confidence: 99%

Observation of a robust catalyst support based on metallic glass for large current-density water electrolysis

Pan,

Feng,

Zhang

et al. 2024

J. Mater. Chem. A

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“…[13b] Upon annealing at (or above) 175 °C, cubic metallic Ir is generated. [22] Rietveld refinements were performed to identify the crystallography of Ir@SrIrO 3 -150, Ir@SrIrO 3 -175, and Ir@SrIrO 3 -200 (Figure S2 and Table S1, Supporting Information). The results further demonstrates that both Ir@SrIrO 3 -175 and Ir@SrIrO 3 -200 electrocatalysts consist of the SrIrO 3 perovskite phase with a space group of C2/c and the metallic Ir phase with a space group of Fm-3m.…”

Section: Morphology and Structurementioning

confidence: 99%

Partial Exsolution Enables Superior Bifunctionality of Ir@SrIrO₃ for Acidic Overall Water Splitting

Zhao,

Tao,

You

et al. 2024

Advanced Science

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The pursuit of efficient and durable bifunctional electrocatalysts for overall water splitting in acidic media is highly desirable, albeit challenging. SrIrO3 based perovskites are electrochemically active for oxygen evolution reaction (OER), however, their inert activities toward hydrogen evolution reaction (HER) severely restrict the practical implementation in overall water splitting. Herein, an Ir@SrIrO3 heterojunction is newly developed by a partial exsolution approach, ensuring strong metal‐support interaction for OER and HER. Notably, the Ir@SrIrO3‐175 electrocatalyst, prepared by annealing SrIrO3 in 5% H2 atmosphere at 175 °C, delivers ultralow overpotentials of 229 mV at 10 mA cm−2 for OER and 28 mV at 10 mA cm−2 for HER, surpassing most recently reported bifunctional electrocatalysts. Moreover, the water electrolyzer using the Ir@SrIrO3‐175 bifunctional electrocatalyst demonstrates the potential application prospect with high electrochemical performance and excellent durability in acidic environment. Theoretical calculations unveil that constructing Ir@SrIrO3 heterojunction regulates interfacial electronic redistribution, ultimately enabling low energy barriers for both OER and HER.

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Nanoporous PdIr alloy for high-efficiency and durable water splitting in acidic media

Abstract: High efficiency and durable electrocatalysts in acidic environment are critical for boosting the development of proton exchange membrane water electrolyzers. Herein, we report an alloy-surface recombination strategy to fabricate bifunctional...

Cited by 13 publications

References 47 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

Observation of a robust catalyst support based on metallic glass for large current-density water electrolysis

Partial Exsolution Enables Superior Bifunctionality of Ir@SrIrO₃ for Acidic Overall Water Splitting

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Nanoporous PdIr alloy for high-efficiency and durable water splitting in acidic media

Abstract: High efficiency and durable electrocatalysts in acidic environment are critical for boosting the development of proton exchange membrane water electrolyzers. Herein, we report an alloy-surface recombination strategy to fabricate bifunctional...

Cited by 13 publications

References 47 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

Observation of a robust catalyst support based on metallic glass for large current-density water electrolysis

Partial Exsolution Enables Superior Bifunctionality of Ir@SrIrO3 for Acidic Overall Water Splitting

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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

Partial Exsolution Enables Superior Bifunctionality of Ir@SrIrO₃ for Acidic Overall Water Splitting