Fuel, Journal Year: 2025, Volume and Issue: 397, P. 135436 - 135436
Published: April 19, 2025
Language: Английский
International Journal of Heat and Mass Transfer, Journal Year: 2025, Volume and Issue: 244, P. 126889 - 126889
Published: March 15, 2025
Language: Английский
Citations
0
Small, Journal Year: 2025, Volume and Issue: unknown
Published: March 18, 2025
Abstract The efficiency of proton exchange membrane electrolysis cells (PEMECs) is much influenced by the dynamics gas/liquid two‐phase flow at anode side, especially high current densities. Among different components PEMECs, porous transport layers (PTLs) are essential for mass transfer optimization. In this work, novel titanium fiber PTLs designed and fabricated an angle‐selective stacking method. Three oriented with 30°, 60°, 90° angles compared commercial felt. X‐ray micro‐computed tomography results indicate that can avoid dead zones. Electrochemical tests computational fluid simulations demonstrate enhance oxygen expulsion, decrease resistances PEMEC 30° PTL exhibits best performance, polarization voltage resistance decreased ≈67 mV 16 mΩ cm 2 , respectively, to felt density 3 A −2 . work provides a new perspective on enhancing orderly arranging fibers.
Language: Английский
Citations
0
Key engineering materials, Journal Year: 2025, Volume and Issue: 1009, P. 79 - 88
Published: March 18, 2025
The exceptional corrosion resistance, low weight, and high strength of titanium (Ti) make it an excellent choice for components in proton exchange membrane fuel cells (PEMFC). However, during PEMFC operation, Ti undergoes passivation, which diminishes the bipolar plates' (BP) ability to transport electrons between cells. Applying nitride (TiN) coatings, known their good conductive properties, can resolve this issue enhance resistance. Additionally, using additive manufacturing (AM) produce BP offers numerous benefits terms structural control more intricate designs. This study examines impact TiN coating via gas nitriding on Ti-6Al-4V open structures created by powder bed fusion-electron beam/metal (PBF-EB/M) or PM routes, focusing surface characteristics such as composition interfacial contact resistance (ICR).
Language: Английский
Citations
0
Small, Journal Year: 2025, Volume and Issue: unknown
Published: March 30, 2025
Abstract Iridium oxides are the state‐of‐the‐art oxygen evolution reaction (OER) electrocatalysts in proton‐exchange‐membrane water electrolyzers (PEMWEs), but their high cost and scarcity necessitate improved utilization. Crystalline rutile‐type iridium dioxide (IrO 2 ) offers superior stability under acidic OER conditions compared to amorphous oxide x ). However, higher synthesis temperatures required for crystalline phase formation result lower activity due loss active surface area. Herein, a novel perchlorate fusion–hydrothermal (PFHT) method produce nano‐crystalline IrO with enhanced performance is presented. This low‐temperature approach involves calcination at mild temperature (300 °C) presence of strong oxidizing agent, sodium (NaClO 4 ), followed by hydrothermal treatment 180 °C, yielding small (≈2 nm) nanoparticles mass‐specific activity, achieving 95 A g Ir −1 1.525 V RHE ex situ glass‐cell testing. Most importantly, catalyst displays harsh accelerated stress test commercial oxides. The exceptional confirmed PEMWE single‐cell evaluations. demonstrates that PFHT leverages intrinsic properties , effectively overcoming typical trade‐offs between stability.
Language: Английский
Citations
0
Fuel, Journal Year: 2025, Volume and Issue: 397, P. 135436 - 135436
Published: April 19, 2025
Language: Английский
Citations
0