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17. Carbon Dioxide Emission Characteristics and Operation Condition Optimization for Slow-Speed and High-Speed Ship Engines.

Author

Lim, Seunghun, Park, Jinkyu, Lee, Jongtae, Lee, Dongin, and Oh, Jungmo

Subjects
GREENHOUSE gases, CARBON emissions, DIESEL motor exhaust gas, CARBON dioxide, ENERGY consumption
Abstract

Greenhouse gas emissions from ships are estimated to be approximately 1002 million tons per year; this is the largest carbon dioxide (CO2) emission source among nonroad transportation. Previous studies have generally estimated CO2 emissions using fuel- or power-based emission factors based on fuel consumption or engine power. In this study, CO2 emissions from vessels were measured using a portable emission measurement system. Emission characteristics were analyzed according to the vessel's operation conditions and compared with the results of other studies. Generally, the higher the rpm value, the more CO2 is emitted, and the emissions at the maximum rpm differ depending on the type and size of the engine. In order to minimize the emissions by ships, those from high seas should be reduced rather than nearby ports. In addition, a method of establishing optimal operating conditions in consideration of economic and environmental perspectives was proposed. Fuel-based emission factors elicited in this study were constant regardless of engine rpm. The fuel-based emission factors of each engine were found to be similar at 3144.22 and 3150.58 kg-CO2/tonne-fuel. Therefore, distinguishing CO2 emission factors according to engine type is not necessary, and additional research is required to understand the emission factors of each fuel type. [ABSTRACT FROM AUTHOR]

Published
2024
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36. Overall approaches and experiences of first-time participants in the Nuclear Forensics International Technical Working Group’s Fourth Collaborative Material Exercise (CMX-4)

Author

Ho, Doris M. L., Nelwamondo, Aubrey N., Okubo, Ayako, Ramebäck, Henrik, Song, Kyuseok, Han, Sun Ho, Hancke, Jacobus J., Holmgren, Stina, Jonsson, Sofia, Kataoka, Osamu, Lagerkvist, Petra, Lee, Chi-Gyu, Lim, Sang Ho, Park, Jinkyu, Park, Jong-Ho, Pong, Boon Kin, Sandström, Björn, Shinohara, Nobuo, Tan, Angela H. J., Toda, Nobufumi, Tovedal, Annika, and Vesterlund, Anna

Published
2018
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49. Recent advances in amorphous electrocatalysts for oxygen evolution reaction

Author

Park, Jinkyu, Lee, Seonggyu, and Kim, Seongseop

Subjects
General Chemistry
Abstract

Oxygen evolution reaction (OER) has attracted great attention as an important half-reaction in the electrochemical splitting of water for green hydrogen production. However, the inadequacy of highly efficient and stable electrocatalysts has impeded the development of this technology. Amorphous materials with long-range disordered structures have exhibited superior electrocatalytic performance compared to their crystalline counterparts due to more active sites and higher structural flexibility. This review summarizes the preparation methods of amorphous materials involving oxides, hydroxide, phosphides, sulfides, and their composites, and introduces the recent progress of amorphous OER electrocatalysts in acidic and alkaline media. Finally, the existing challenges and future perspectives for amorphous electrocatalysts for OER are discussed. Therefore, we believe that this review will guide designing amorphous OER electrocatalysts with high performance for future energy applications.

Published
2022

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