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Analytical modeling framework for performance degradation of PEM fuel cells during startup-shutdown cycles
Title
Analytical modeling framework for performance degradation of PEM fuel cells during startup-shutdown cycles
Author
Xu, Jun, Yin, Sha, Li, Yunqi, Chen, Xiran
Date Created
2020
Subjects--Topical
Mechanical engineering, Fuel cells
Description
Startup-shutdown cycling is one of the main factors that contribute to fuel cell deterioration related to high cathode potential. In this study, a coupled model with the carbon corrosion model and agglomerate model of the cathode catalyst layer is...
Bioinspired golden spiral shapes on crushing protection behaviors of tubular structures
Title
Bioinspired golden spiral shapes on crushing protection behaviors of tubular structures
Author
Xu, Jun, Sherman, John, Zhang, Wen, Waheed, Hamza
Date Created
2023
Subjects--Topical
Materials, Engineering design
Description
Advanced structure design for energy absorption is a long-lasting pursuit due to its fascinating scientific merit in mechanics and important engineering application. Curves, a type of mathematical variation in geometry, are widely adopted in the b...
Comprehensive battery safety risk evaluation : aged cells versus fresh cells upon mechanical abusive triggering
Title
Comprehensive battery safety risk evaluation : aged cells versus fresh cells upon mechanical abusive triggering
Author
Xu, Jun, Ma, Lin, Gao, Xiang, Jia, Yikai
Date Created
2023
Subjects--Topical
Materials, Lithium ion batteries
Description
Despite their wide applications, lithium-ion batteries (LIBs) have been struggling with their safety risks arising from different lifetime stages. Here, the NCMA pouch cell is taken as an example, and the safety of both fresh and aged cells from t...
Dynamic behaviour of core-shell structured Si nanoparticles during lithiation/delithiation cycling at dynamic loadings
Title
Dynamic behaviour of core-shell structured Si nanoparticles during lithiation/delithiation cycling at dynamic loadings
Author
Xu, Jun, Gao, Xiang, Yuan, Chunhao
Date Created
2018
Subjects--Topical
Materials--Dynamic testing, Mechanical engineering
Description
Dynamic behaviours of the core-shell structured (CSS) Si nanoparticles during electrochemical cycling were modelled. A core-shell-structured model that contained Si nanoparticles wrapped with amorphous carbon (a-C) was established. The system was ...
Exploring high-energy and mechanically robust anode materials based on doped graphene for lithium-ion batteries: a first-principles study
Title
Exploring high-energy and mechanically robust anode materials based on doped graphene for lithium-ion batteries: a first-principles study
Author
Xu, Jun, Chang, Cheng, Yin, Sha
Date Created
2020
Subjects--Topical
Lithium ion batteries, Mechanical engineering
Description
In this study, the adsorption of Li atoms on various types of doped graphene with substituents, including boron, nitrogen, sulfur and silicon atoms, has been theoretically investigated by first-principles calculations, based on the density functio...
Micelle-assisted strategy for the direct synthesis of large-sized mesoporous platinum catalysts by vapor infiltration of a reducing agent
Title
Micelle-assisted strategy for the direct synthesis of large-sized mesoporous platinum catalysts by vapor infiltration of a reducing agent
Author
Xu, Jun, Li, Yunqi, Liu, Yuwei, Yamauchi, Yusuke
Date Created
2018
Subjects--Topical
Metals, Mechanical engineering
Description
Stable polymeric micelles have been demonstrated to serve as suitable templates for creating mesoporous metals. Herein, we report the utilization of a core-shell-corona type triblock copolymer of poly(styrene-b-2-vinylpyridine-b-ethylene oxide) an...
Tough nature-inspired helicoidal composites with printing-induced voids
Title
Tough nature-inspired helicoidal composites with printing-induced voids
Author
Xu, Jun, Yin, Sha, Chen, Haoyu, Yang, Ruiheng
Date Created
2020
Subjects--Topical
Three-dimensional modeling, Three-dimensional printing
Description
Exoskeletons of Odontodactylus japonicas, the smasher-type mantis shrimp, feature a raptorial appendage comprising a Bouligand architecture of chitin nanofibrils with newly observed voids or defects between the polysaccharide alpha-chitin and prot...
Understanding of stress‐driven internal short circuit mechanisms in lithium‐ion batteries with high SOCs
Title
Understanding of stress‐driven internal short circuit mechanisms in lithium‐ion batteries with high SOCs
Author
Xu, Jun, Li, Jiani, Gao, Xiang, Duan, Xudong
Date Created
2023
Subjects--Topical
Lithium ion batteries, Lithium cells
Description
The characteristics of internal short circuits (ISC) play a critical role in determining the thermal runaway behaviors and associated hazards of lithium-ion batteries (LIBs). However, due to safety concerns and limitations in operando characteriza...