This work demonstrates the application of high-resolution, 3D imaging to characterize micro- and nano-scale features iridium oxide (IrO2) anode catalyst layers (CLs) in proton exchange membrane water electrolysis (PEMWE). Scanning electron microscopy (SEM) nanoscale X-ray computed tomography (nano-CT) reveal differences micro-scale between spray-coated blade-coated CLs, CLs along fabrication testing timeline. The electrode thickness distribution tested CL suggests increased thinning regions...

To enable the greater installed capacity of proton exchange membrane water electrolysis (PEMWE) for clean hydrogen production, associated costs must be lowered while achieving high current density performance and durability. Scarce expensive iridium (Ir) required oxygen evolution reaction (OER) is a large contributor to overall cost, yet loadings Ir (1-2 mg

Decarbonizing sectors that are challenging and economically demanding to electrify, such as heavy-duty ground transportation, aviation, industries like ammonia, steel, petroleum refining, synthetic fuels, cement production, is crucial in addressing climate change environmental pollution. The key strategy for reducing the reliance of these on fossil fuels cutting emissions involves utilizing hydrogen with low carbon intensity. Proton exchange membrane water electrolyzers (PEMWEs) play a vital...

Herein, we present the successful implementation of a composite anode using conductive additive to enable low iridium (Ir) loadings for PEMWE while maintaining high-performance operation. We use platinum (Pt) black as given its high electrical conductivity, stability, and price currently one-fifth that Ir. Using loading Pt allowed retained electrode thickness, good dispersion Ir particles, drastically decreased sheet resistance at 0.10 mg cm -2 . Compared standard oxide with high,...

Herein, we present the successful implementation of a composite anode using conductive additive to enable low iridium (Ir) loadings for PEMWE while maintaining high-performance operation. We use platinum (Pt) black as given its high electrical conductivity, stability, and price currently one-fifth that Ir. Using loading Pt allowed retained electrode thickness, good dispersion Ir particles, drastically decreased sheet resistance at 0.10 mg cm -2 . Compared standard oxide with high,...

The production of inexpensive, clean hydrogen will be vital for supporting wide decarbonization efforts across the sectors industrial chemicals, transportation, and electric grid. Proton exchange membrane water electrolysis (PEMWE) has great potential as a low-temperature, high current density option low-carbon production; however, at present one its most significant barriers to widespread commercial adoption is cost associated with iridium (Ir) anode catalyst 1 . Unfortunately, many...

In this work, we demonstrate the use of high-resolution imaging to characterize micro- and nano-scale features proton exchange membrane water electrolysis (PEMWE) iridium oxide (IrO2) anode catalyst layers (CLs) towards a better understanding relationship between CL fabrication, morphology, performance. We two methods 3D, imaging: (1) nanoscale X-ray computed tomography (nano-CT), (2) Xe-plasma focused ion beam with scanning electron microscopy (pFIB-SEM). first present SEM images nano-CT...

One of the current challenges proton exchange membrane (PEM) water electrolyzers (PEMWE) is to reduce high costs associated with iridium as anode catalyst material. In commercial PEMWE electrode assemblies (MEAs), loadings are 2 3 mg Ir /cm . However, for systems match global energy demand, Ir-specific power density must increase by ~ 50-fold [1, 2]. This can be achieved decreasing and increasing utilization iridium. Previous work has determined that homogeneity layers generally favorable...

Proton exchange membrane water electrolyzers (PEMWEs) present a promising hydrogen production alternative to common methods like steam methane reforming, particularly for producing green from renewable sources. However, scaling up PEM is challenged by the high cost of their platinum group metal catalysts (Ir & Pt) oxygen and evolution reactions (OER HER). This study focused on performance its subsequent volage loss breakdown analysis. Current voltage analyses separate losses into three...

The current use of expensive and geographically-limited precious metal catalysts, typically iridium, in proton exchange membrane water electrolyzer (PEMWE) anodes is necessary to accelerate the sluggish oxygen evolution reaction (OER). However, high loadings iridium catalyst drastically increase capital costs PEM electrolysis, while low lead a significant decline efficiency hydrogen production. Thus, PEMWE anode fabrication methods must be optimized achieve highest performance with lower...