Results 91 to 100 of about 28,491 (215)

In Situ Surface Reconstruction and Carbon Encapsulation for High‐Performance Pt‐Lean Catalysts beyond Conventional Core–Shell Designs

Small, EarlyView.
A one‐step in situ fabrication produces Pt‐segregated nanoparticles encapsulated in porous carbon shells. This design drastically reduces Pt content while maintaining high oxygen reduction reaction activity and long‐term durability. The catalyst meets DOE targets even at ultralow Pt loading, presenting a practical pathway toward cost‐effective, high ...
Jiho Min, Jeong Hee Lee, Keonwoo Ko, Yunjin Kim, Hyelim Park, Mansu Kim, Dongwook Lee, Sung‐Dae Yim, Yun Sik Kang, Joseph T. Hupp, Sung Jong Yoo, Namgee Jung   +11 more
wiley   +1 more source

THREE-DIMENSIONAL SIMULATIONS OF TRANSIENT RESPONSE OF PEM FUEL CELLS [PDF]

, 2007
Transients have utmost importance in the lifetime and performance degradation of PEM fuel cells. Recent studies show that cyclic transients can induce hygro-thermal fatigue.
Yesilyurt, Serhat, Yeşilyurt, Serhat
core   +2 more sources

Laying the Foundation for Digital Material Design of Porous Transport Electrodes for PEM Water Electrolysis With Multiscale Tomography

Small, EarlyView.
This paper presents the first multiscale identical location tomography of a porous transport electrode for PEM water electrolysis. Different tomography and modeling approaches determine the relevant structural properties ranging from micrometer‐thick fibers to nanometer‐thin binder films covering the catalyst particles.
Markus Bierling, David McLaughlin, Andreas Hutzler, Mingjian Wu, Darius Hoffmeister, Dennis Chalupczok, Erdmann Spiecker, Thomas Böhm, Simon Thiele   +8 more
wiley   +1 more source

Numerical simulation of two-phase cross flow in the gas diffusion layer microstructure of proton exchange membrane fuel cells [PDF]

, 2017
The cross flow in the under-land gas diffusion layer (GDL) between 2 adjacent channels plays an important role on water transport in proton exchange membrane fuel cell. A 3-dimensional (3D) two-phase model that is based on volume of fluid is developed to
Du, Q, Jiao, K, Niu, Z, Wang, Y, Yin, Y
core   +1 more source

Fe/N‐Doped Carbon with Nearly Ordered Mesopores and Tunable Particle Sizes as Model Catalysts for Quantitative Evaluation of Electrocatalytic Active Sites

Advanced Science, Volume 13, Issue 19, 2 April 2026.
This study is dedicated to the design and synthesis of MOF‐derived mesoporous Fe/N‐doped carbons as model catalysts, aiming to quantitatively evaluate the utilization of active sites in the ORR. Through modulation followed by pyrolysis, we successfully prepare size‐tunable Fe/MNC‐x with doped iron atoms and mesoporous structures. The smaller Fe/MNC‐250
Hongjuan Zhang, Yunqi Li, Jiacheng Zhao, Yue Liu, Xingtao Xu, Yusuke Yamauchi, Jing Tang, Min Zhou   +7 more
wiley   +1 more source

CO preferential oxidation in a novel Au@ZrO₂ flow-through catalytic membrane reactor with high stability and efficiency [PDF]

, 2016
CO preferential oxidation (CO-PROX) achieves much interest as a strategy to remove trace CO in reformed gases for hydrogen utilization. Herein, we reported a novel Au@ZrO₂ catalytic membrane reactor by embedding gold nano-particles in ZrO₂ hollow fiber ...
Chen, Changlin, Gu, Xuehong, Jin, Wanqin, Ke, Xuebin, Zhang, Yuting, Zhu, Feng   +5 more
core   +2 more sources

Spatially Resolved Current Density and Electrochemical Impedance Spectroscopy in PEM Fuel Cells

Fuel Cells, Volume 26, Issue 2, April 2026.
ABSTRACT The durability and efficiency of proton exchange membrane fuel cells (PEMFC) are crucial for their deployment in heavy‐duty applications. The membrane‐electrode assembly (MEA) of a PEMFC plays a central role and can be characterized using in situ methods like polarization curves, current density mapping, and electrochemical impedance ...
Eva Fensterle, Frank Rabsahl, Jürgen Hunger, Florian Wilhelm, Joachim Scholta, Markus Hölzle   +5 more
wiley   +1 more source

Development of a Two‐Stage Cold Pressing and Tempering Process of Graphite Compound Bipolar Plates

Fuel Cells, Volume 26, Issue 2, April 2026.
ABSTRACT Proton‐exchange membrane fuel cells (PEMFCs) are considered a key technology for decarbonized energy systems, particularly in combination with sustainably sourced green hydrogen. The functional performance and reliability of core components, such as bipolar plates (BPPs), depends critically on the manufacturing processes. This study explores a
Maschal Hakimiy, Lajos Groffmann, Marco Grundler, Jan Middelhoff, Christian Wacker, Sabrina Zellmer, Klaus Dröder   +6 more
wiley   +1 more source

Numerical Study of Pressure Drop Mechanism and Cross Flow Behavior in the Gas Channel and Porous Medium of a Polymer Electrolyte Membrane Fuel Cell

Journal of Thermal Science and Technology, 2013
The three-dimensional, transient, isothermal, gas-flow behavior in the serpentine channel and porous gas-diffusion layer (GDL) of a polymer electrolyte membrane fuel cell was investigated numerically.
K. M. SALAHUDDIN, Akira NISHIMURA, Nobuyuki OSHIMA, Litan Kumar SAHA   +3 more
doaj   +1 more source

Study of a micro-structured PHE for the thermal management of a fuel cell [PDF]

, 2011
This paper was presented at the 3rd Micro and Nano Flows Conference (MNF2011), which was held at the Makedonia Palace Hotel, Thessaloniki in Greece.
3rd Micro and Nano Flows Conference (MNF2011), Mouza, AA, Paras, SV, Stogiannis, IA   +3 more
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