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4. Numerical Simulation of Residual Stress in the JCO-Welding-Calibration Whole Process Forming of the Submarine Pipeline Pipes

Author

Qi, Shaocong, Yu, Gaochao, Chen, Siguo, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Ivanov, Vitalii, Series Editor, Haddar, Mohamed, Series Editor, Cavas-Martínez, Francisco, Editorial Board Member, di Mare, Francesca, Editorial Board Member, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Xu, Jinyang, Editorial Board Member, Mocellin, Katia, editor, Bouchard, Pierre-Olivier, editor, Bigot, Régis, editor, and Balan, Tudor, editor

Published
2024
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7. Influence of Local Density on Concentrated Static Load Performance of Oriented Strandboard

Author

Chen, Siguo and Knudson, Robert

Subjects
Strains and stresses -- Testing, Stress relaxation (Materials) -- Testing, Stress relieving (Materials) -- Testing, Business, Forest products industry
Abstract

Fourteen 1,220 by 2,440 by 11.1-mm commercial Oriented Strandboard (OSB) panels were X-ray scanned to obtain horizontal density matrices. Localized densities around the concentrated static load (CSL) testing points of the panels were calculated prior to the CSL test. A linear regression analysis was conducted to assess the impact of the localized density on CSL performance. The results indicated that both deflection and ultimate load were highly correlated with the local density. Deflection and ultimate load were somewhat correlated ([R.sup.2] = 0.52). The CSL deflection decreased and ultimate load increased significantly with increasing local density. The impact of local density on ultimate load was greater than on deflection. Horizontal density variation is inherent in OSB manufacturing processes, especially in the mat forming process. A number of factors, including evenness of strands in the metering bin, condition of picker rolls and dissolving rolls, and strand and fines surging, can affect horizontal density distribution. OSB panels with a high degree of variation in horizontal panel density may cause low density spots that increase the chance of failure in CSL test. It is therefore crucial to minimize the occurrence of very low density areas in order to reduce the odds of ultimate load failure. Reducing density variability allows OSB companies to increase the CSL properties of their products, which would otherwise need to be done by making the panel denser. Improving horizontal density uniformity allows for lowering of the average panel density, which reduces the manufacturing cost and helps improve the company's bottom line., Oriented Strandboard (OSB) market is growing rapidly especially since the onset of the COVID-19 pandemic. A report released in 2021 by Reportlinker.com (Globenewswire 2021) projected the global OSB market to [...]

Published
2023
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14. Blocking the Dendrite‐Growth of Zn Anode by Constructing Ti4O7 Interfacial Layer in Aqueous Zinc‐Ion Batteries.

Author

Song, Yang, Liu, Yongduo, Luo, Shijian, Yang, Yuran, Chen, Fadong, Wang, Meng, Guo, Lin, Chen, Siguo, and Wei, Zidong

Subjects
ZINC ions, ANODES, HYDROGEN evolution reactions, ELECTRIC fields, DENDRITIC crystals
Abstract

Zinc metal is a promising choice as a high‐capacity and cost‐effective anode for aqueous zinc‐based batteries. However, it faces challenges related to low cycling stability and poor reversibility due to parasitic reactions and the growth of zinc dendrites. In this study, a solution is proposed by introducing a conductive Ti4O7 layer on the zinc anode to enhance electrode stability. The Ti4O7 layer serves a dual purpose, effectively preventing spontaneous corrosion of the zinc anode in the electrolyte, thereby inhibiting the hydrogen evolution reaction and the generation of byproducts. Simultaneously, it promotes Zn nucleation and ensures a uniform electric field distribution, resulting in homogeneous Zn plating and stripping compared to using a bare zinc anode. Consequently, the Ti4O7‐coated Zn anode experiences a significant reduction in over‐potential, demonstrating long‐term stability and dendrite‐free behavior. This outcome ensures low polarization potential and high cycling stability in zinc‐ion batteries. The work underscores the potential of conductive oxides in the development of stable metal electrodes. [ABSTRACT FROM AUTHOR]

Published
2024
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22. Locking the lattice oxygen in RuO2 to stabilize highly active Ru sites in acidic water oxidation.

Author

Ping, Xinyu, Liu, Yongduo, Zheng, Lixia, Song, Yang, Guo, Lin, Chen, Siguo, and Wei, Zidong

Abstract

Ruthenium dioxide is presently the most active catalyst for the oxygen evolution reaction (OER) in acidic media but suffers from severe Ru dissolution resulting from the high covalency of Ru-O bonds triggering lattice oxygen oxidation. Here, we report an interstitial silicon-doping strategy to stabilize the highly active Ru sites of RuO2 while suppressing lattice oxygen oxidation. The representative Si-RuO2−0.1 catalyst exhibits high activity and stability in acid with a negligible degradation rate of ~52 μV h−1 in an 800 h test and an overpotential of 226 mV at 10 mA cm−2. Differential electrochemical mass spectrometry (DEMS) results demonstrate that the lattice oxygen oxidation pathway of the Si-RuO2−0.1 was suppressed by ∼95% compared to that of commercial RuO2, which is highly responsible for the extraordinary stability. This work supplied a unique mentality to guide future developments on Ru-based oxide catalysts’ stability in an acidic environment.RuO2 is highly active toward the acidic electrochemical oxygen evolution reaction but exhibits instability due to lattice oxygen oxidation. Here, authors prepare an interstitial Si-decorated RuO2 catalyst with improved stability for acidic water oxidation by suppressing lattice oxygen oxidation. [ABSTRACT FROM AUTHOR]

Published
2024
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27. A phosphate tolerant Pt-based oxygen reduction catalyst enabled by synergistic modulation of alloying and surface modification.

Author

Long, Daojun, Xie, Zhenyang, Wang, Minjian, Chen, Siguo, and Wei, Zidong

Subjects
OXYGEN reduction, CATALYST poisoning, CATALYSTS, FUEL cells, ALLOYS
Abstract

Addressing phosphoric acid poisoning of platinum-based catalysts in high-temperature fuel cells still remains a strategic and synthetic problem. Here, we synthesized a Pt3Co@MoOx-NC catalyst with a Pt3Co active core and MoOx modification on the surface, which simultaneously exhibits high ORR activity and phosphate tolerance. [ABSTRACT FROM AUTHOR]

Published
2023
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28. Strengthening Pt/WOx interfacial interactions to increase the CO tolerance of Pt for hydrogen oxidation reaction.

Author

Long, Daojun, Ping, Xinyu, Ni, Jingtian, Chen, Fadong, Chen, Siguo, Wei, Zidong, Guo, Lin, and Zheng, Jinyu

Subjects
HYDROGEN oxidation, ELECTRONIC modulation, ELECTRONIC structure, FUEL cells, ELECTRODES, OXYGEN reduction
Abstract

Here, the modulation of the Pt electronic structure by the formation of an amorphous WOx overlayer on Pt nanoparticles is proposed. The resulting Pt/WOx@NC electrode shows exceptional CO oxidation potential (0.24 V vs. RHE) in aqueous test, and the corresponding membrane electrode assembly (MEA) steadily generates power in fuel cells fed with H2 gas containing 1000 ppm CO. [ABSTRACT FROM AUTHOR]

Published
2023
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