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9 results on '"fuel generation"'

5. HYDROGEN FUEL SYSTEM FOR NAVY UNMANNED SYSTEMS IN AN EXPEDITIONARY ADVANCED BASING OPERATIONS ENVIRONMENT (EABO)

Author

Beery, Paul T., Pollman, Anthony G., Systems Engineering (SE), Meyen-Faria, Rachel, Petersen, Bradley G., Prak, Vanny, Schweichler, Jonathan R., Beery, Paul T., Pollman, Anthony G., Systems Engineering (SE), Meyen-Faria, Rachel, Petersen, Bradley G., Prak, Vanny, and Schweichler, Jonathan R.

Abstract

Many unmanned undersea and aerial systems currently in development are looking for alternative energy sources, including hydrogen, to maximize operational reach and persistence. Current Expeditionary Advance Base Operations (EABO) processes are heavily reliant on logistics and depleting petroleum sources. This capstone project will analyze the potential use of hydrogen fuel generated via a mobile, independent system to address logistics and fuel depletion concerns for EABO., NPS Naval Research Program, This project was funded in part by the NPS Naval Research Program., Civilian, Department of the Navy, Civilian, Department of the Navy, Civilian, Department of the Navy, Civilian, Department of the Navy, Approved for public release. Distribution is unlimited.

Published
2022

6. HYDROGEN FUEL SYSTEM FOR NAVY UNMANNED SYSTEMS IN AN EXPEDITIONARY ADVANCED BASING OPERATIONS ENVIRONMENT (EABO)

Author

Meyen-Faria, Rachel, Petersen, Bradley G., Prak, Vanny, Schweichler, Jonathan R., Beery, Paul T., Pollman, Anthony G., and Systems Engineering (SE)

Subjects
EABO, systems engineering, expeditionary advanced basing operations, logistics, littoral operations, fuel cells, operational reach, alternative energy, fuel storage, hydrogen, fuel generation, fuel system, contested environment, unmanned systems, LOCE, future warfighting, sea denial, fuel
Abstract

Many unmanned undersea and aerial systems currently in development are looking for alternative energy sources, including hydrogen, to maximize operational reach and persistence. Current Expeditionary Advance Base Operations (EABO) processes are heavily reliant on logistics and depleting petroleum sources. This capstone project will analyze the potential use of hydrogen fuel generated via a mobile, independent system to address logistics and fuel depletion concerns for EABO. NPS Naval Research Program This project was funded in part by the NPS Naval Research Program. Civilian, Department of the Navy Civilian, Department of the Navy Civilian, Department of the Navy Civilian, Department of the Navy Approved for public release. Distribution is unlimited.

Published
2022

8. Visible-Light-Driven CO2 Reduction into Methanol Utilizing Sol-Gel-Prepared CeO2-Coupled Bi2O3 Nanocomposite Heterojunctions

Author

Mohamed Mokhtar Mohamed Mostafa, Ahmed Shawky, Sharif Fakhruz Zaman, Katabathini Narasimharao, Mohamed Abdel Salam, Abdulmohsen Ali Alshehri, Nezar H. Khdary, Sulaiman Al-Faifi, and Abhishek Dutta Chowdhury

Subjects
heterojunction photocatalysts, nanostructures, CO2 conversion, fuel generation, visible light activity, Physical and Theoretical Chemistry, Catalysis, General Environmental Science
Abstract

Carbon dioxide (CO2) photoreduction into renewable fuels over semiconductor photocatalysts has emerged as a green and sustainable alternative for energy production. Consequently, tremendous efforts are being performed to develop robust and sustainable photocatalysts. Therefore, visible-light active nanocomposite photocatalysts composed of 5.0–20.0 wt.% bismuth oxide (Bi2O3) and cerium oxide (CeO2) were synthesized by a sol-gel-based process. The prepared nanocomposites were evaluated for the promoted photocatalytic reduction of CO2 into methanol (CH3OH). Various characterizations of the obtained photocatalysts exposed an outstanding development of crystalline structure, morphology, and surface texture due to the presence of Bi2O3. Moreover, the absorbance of light in the visible regime was improved with enhanced charge separation, as revealed by the exploration of optical response, photoluminescence, and photocurrent measurements. The overall bandgap calculations revealed a reduction to 2.75 eV for 15% Bi2O3/CeO2 compared to 2.93 eV for pure CeO2. Moreover, the adjusted 2.8 g L−1 dose of 15% Bi2O3/CeO2 selectively produced 1300 μmol g−1 CH3OH after 9 h of visible light irradiation. This photocatalyst also exhibits bearable reusability five times. The improved progression of 15% Bi2O3/CeO2 is denoted by significant charge separation as well as enhanced mobility. This study suggests the application of metal oxide-based heterojunctions for renewable fuel production under visible light.

Published
2022
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9. Emerging covalent organic frameworks tailored materials for electrocatalysis.

Author

Cui, Xun, Lei, Sheng, Wang, Aurelia Chi, Gao, Likun, Zhang, Qing, Yang, Yingkui, and Lin, Zhiqun

Abstract

Covalent organic frameworks (COFs) are an emerging type of porous crystalline polymers with tunable nanopore size, high accessible surface area, predesigned building units, abundant active sites, devisable chain structures, and programmable topological architectures. These collective characteristics are essential in creating high-efficiency electrocatalysts for energy conversion and fuel generation in metal-air batteries and fuel cells. Recent years have witnessed considerable advances in rational design and controllable fabricate of COF-based electrocatalysts for oxygen reduction, oxygen evolution, hydrogen evolution, and CO 2 reduction reactions. In this review, engineering strategies of COFs toward electrocatalysts are first summarized and given particular attention, highlighting their influence on intrinsic electrocatalytic performance. A systematic overview of the fundamental principles behind specific electrocatalysis reactions is then performed. Significant breakthroughs of COFs and their derivatives are presented in detail with an emphasis on the relationship between the molecular structures of COFs and their electrocatalytic performance. Lastly, current challenges and future perspectives on tailoring COFs for high-performance electrocatalysts are discussed. This review aims to identify general guidelines and the potential of COFs to outperform state-of-the-art electrocatalysts that use their noble metal-based counterparts. Image 1 • Summarize engineering strategies of COFs toward electrocatalysts. • Provide overview of fundamental principles behind specific electrocatalysis reactions. • Present significant breakthroughs of COFs and their derivatives for ORR, OER, HER, CO 2 RR and other reactions. • Discuss current challenges and future perspectives on tailoring COFs for high-performance electrocatalysts. [ABSTRACT FROM AUTHOR]

Published
2020
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