Results 61 to 70 of about 13,237 (207)

Progress in Experimental Methods Using Model Electrodes for the Development of Noble‐Metal‐Based Oxygen Electrocatalysts in Fuel Cells and Water Electrolyzers

Small Methods, Volume 9, Issue 7, July 19, 2025.
Electrochemical experimental studies using single‐crystal electrodes as model catalysts, with controlled elemental distribution, microstructure, and modification patterns, provide valuable insights into reaction and degradation mechanisms as well as catalyst development strategies.
Kensaku Kodama, Naoto Todoroki
wiley   +1 more source

Analysis of timber as sustainable material for construction [PDF]

, 2014
Comunicació presentada a IN-TECH 2014 International Conference on Innovative Technologies (Leiria, Portugal 10-13, september 2014).Facing the climate change scenario, professionals and technicians of civil engineering and architecture are searching for ...
Braulio-Gonzalo, Marta, Gallego Navarro, Teresa, Lecha Sangüesa, Antonio   +2 more
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Proton Conduction of a Hydrothermally Synthesized Hexaazatriphenylene‐Based Covalent Organic Framework

Advanced Materials Interfaces, Volume 12, Issue 11, June 9, 2025.
A quinone‐functionalized hexaazatriphenylene‐based covalent organic framework (HAQ‐COF) is synthesized, making HAQ‐COF a promising polymer electrolyte membrane material for polymer electrolyte fuel cells. HAQ‐COF exhibits high water retention at room temperature and atmospheric pressure, along with high thermal stability.
Yuki Okamura, Yousuke Tanada, Mikiya Sasano, Keita Akagi, Momoka Isobe, Shoko Tsuchiya, Naoki Takimoto, Fumiya Kobayashi, Makoto Tadokoro, Kaname Kanai   +9 more
wiley   +1 more source

Enhancing Oxygen Reduction Reaction Activity on Pt/C Catalysts for PEFCs Using Phosphonium Ionic Liquid Layers: Effects of Proton Introduction and Physicochemical Properties

Electrochemistry
Polymer electrolyte fuel cells (PEFCs) have attracted significant attention as clean energy conversion systems. Pt nanoparticles are commonly used as cathode catalysts in PEFCs due to their high activity for the oxygen reduction reaction (ORR).
Hirohisa YAMADA, Takuya OKADA, Mitsuhiro MATSUMOTO, Yu YAO, Uta ANDO, Yuri OI, Toshikazu HIGASHI, Yohtaro INOUE, Katsuhiko TSUNASHIMA   +8 more
doaj   +1 more source

Durability of Pt‐Alloy Catalyst for Heavy‐Duty Polymer Electrolyte Fuel Cell Applications under Realistic Conditions

ChemElectroChem, Volume 12, Issue 8, April 14, 2025.
Higher degradation of catalyst observed for PtCo supported on high surface area carbon when subjected to two accelerated stress tests (ASTs) for polymer electrolyte fuel cells. Abstract As an emerging technology, polymer electrolyte fuel cells (PEFCs) powered by clean hydrogen can be a great source of renewable power generation with flexible ...
Celine H. Chen, Matthew Coats, Florian Chabot, Yu Morimoto, Plamen Atanassov, Nobumichi Tamura, Jonathan Braaten, Björn M. Stühmeier, Christina Johnston, Svitlana Pylypenko, Lei Cheng, Iryna V. Zenyuk   +11 more
wiley   +1 more source

Support‐Free, Connected Core–Shell Nanoparticle Catalysts Synthesized via a Low‐Temperature Process for Advanced Oxygen Reduction Performance

Advanced Science, Volume 12, Issue 7, February 17, 2025.
A novel approach for synthesizing support‐free, connected nanoparticles with non‐Pt metal core and Pt atomic shell is presented. It employs a low‐temperature synthesis method, enabling significant improvements in the catalyst surface area and oxygen reduction reaction performance.
Aparna Chitra Sudheer, Gopinathan M. Anilkumar, Hidenori Kuroki, Takeo Yamaguchi   +3 more
wiley   +1 more source

Development of a measurement technique for current-density in PEFC using planar surface coil as a NMR signal detector (Third report: Inversion analysis of current-density distribution generating in PEFC at case of current flowing in lamination direction)

Nihon Kikai Gakkai ronbunshu, 2014
In the second report, a method for measuring the spatial distribution of the electric current generated in a PEFC from the frequency shift of the Nuclear Magnetic Resonance (NMR) signal of water acquired by eight planar surface coils inserted into the ...
Kuniyasu OGAWA, Yasuo YOKOUCHI, Tomoyuki HAISHI, Kohei ITO   +3 more
doaj   +1 more source

Short‐term impacts of selective logging on forest elephants

Conservation Science and Practice, Volume 7, Issue 2, February 2025.
This study assesses the impact of selective logging on forest elephants (Loxodonta cyclotis) in Gabon. Using camera traps and dung surveys, we found no negative effects on their presence, abundance, or activity. The results suggest that responsibly managed timber concessions can support forest elephant conservation.
Morgane Scalbert, Davy Fonteyn, Fructueux Houngbégnon, Robin Scalbert, Cédric Vermeulen, Barbara Haurez, Simon Lhoest, Yves Brostaux, Gauthier Ligot, Anaïs‐Pasiphaé Gorel, Jean‐Louis Doucet   +10 more
wiley   +1 more source

Impact of operation condition on temperature distribution in single cell of polymer electrolyte fuel cell operated at higher temperature than usual

Mechanical Engineering Journal, 2016
For improving performance of the stationary Polymer Electrolyte Fuel Cell (PEFC) system, the cell operating temperature up to 90°C will be preferred in Japan during the period from 2020 to 2030.
Akira NISHIMURA, Masato YOSHIMURA, Amira Hakimi MAHADI, Masafumi HIROTA, Mohan Lal KOLHE   +4 more
doaj   +1 more source

Certified Organic Forests & Timber: the Hippocratic Opportunity [PDF]

, 2007
Organic farming was proposed in 1940 by Lord Northbourne as a response to chemical agriculture. Since then, organic agriculture has developed into an international A$50 billion industry with annual growth reported up to 30%.
Paull, John
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