Metallic-Ir-based anode catalysts in PEM water electrolyzers: Achievements, challenges, and perspectives

Fu, Cehuang; O'Carroll, Thomas; Shen, Shuiyun; Luo, Liuxuan; Zhang, Junliang; Xu, Hui; Wu, Gang

doi:10.1016/j.coelec.2023.101227

Cited by 12 publications

(12 citation statements)

References 57 publications

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“…Another method to efficiently engineer the PTL/CL interface with ultralow Ir loading is combining a support material to CL, forming a thicker layer (Figure f). The construction of a supported CL can not only increase catalyst utilization by avoiding gaps in the CL and enhancing Ir dispersion but also favor the contact between the CL and PTL as well . A similar case is that, in PEMFC, Pt nanoparticles are usually well dispersed on carbon black, which has high surface area and high conductivity, and can greatly enhance the contact at PTL/CL interface …”

Section: Anode Interface Engineeringmentioning

confidence: 99%

Anode Engineering for Proton Exchange Membrane Water Electrolyzers

Qiu,

Xu,

Chen

et al. 2024

ACS Catal.

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Sustainable hydrogen (H 2 ) production via water electrolysis is one of the most critical pathways to decarbonize the chemical industry. Among various electrolyzer technologies, proton exchange membrane (PEM) water electrolyzer (PEMWE) is widely regarded as having a great advantage and promise for large-scale H 2 production given its high efficiency, reliable stability, and high output pressure. Though state-of-the-art iridium-based catalysts exhibit satisfying activity and stability for oxygen evolution reaction at the anode, their high loadings, as well as the precious metal coating and titanium bulk of porous transport layer (PTL) and bipolar plates, significantly add to the capital cost of the PEMWE stack. The respective optimization and integration of PTL, catalyst layer (CL) and PEM is critical for enhancing charge transfer, mass transport, and catalyst utilization to lower the operation and capital cost, yet it has not received adequate attention. In this review, anode engineering strategies to rationally design PTL, PTL/CL interface and PEM/CL interface for performance improvement and cost reduction are summarized. Current understandings on PTL material, structure, and two-phase transport properties are first gathered, followed by the discussion of anode interface engineering methods and catalyst coating techniques. Given the raising attention to large-scale water electrolyzers operating at high current densities, this review provides a practical and comprehensive direction for next-generation PEMWE anode design by addressing the integration of key components related to the cost, efficiency and stability issues in PEMWE.

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Section: Anode Interface Engineeringmentioning

confidence: 99%

Anode Engineering for Proton Exchange Membrane Water Electrolyzers

Qiu,

Xu,

Chen

et al. 2024

ACS Catal.

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“…1d). 9 Generally, Ir would be oxidized to IrO 2 during the OER, followed by the adsorption of *OH ("*" stands for radical) on the surface of IrO 2 . Then, the Ir center is further oxidized, which leads to the formation of the IrO 2 (OH) intermediate (outlined in Fig.…”

Section: Qing LImentioning

confidence: 99%

“…However, large-scale application of this technology is severely hindered by the high cost and limited activity/durability of the catalysts, especially on the anode. 7–9…”

Section: Introductionmentioning

confidence: 99%

Designing active and stable Ir-based catalysts for the acidic oxygen evolution reaction

Lin¹,

Wang²,

Li³

2023

Ind. Chem. Mater.

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“…7 The complexity of the OER adds significant overpotential to the realistic water splitting procedure, resulting in sluggish reaction kinetics. [8][9][10][11][12] With the aim of significantly reducing the reaction overpotential, several studies have been published focusing on powerful OER electrocatalysts with different composites and structures [13][14][15][16][17][18][19][20][21][22][23][24][25][26] such as noble metals, metal single-atoms, 27,28 layered double hydroxides (LDHs), and metal oxides or chalcogenides. 29,30 The exploration and development of the best-fit catalysts depend critically on a thorough knowledge of the fundamental catalytic mechanisms, which necessitates the mapping of actual reaction pathways.…”

Section: Introductionmentioning

confidence: 99%