Accession Number : AD1007683


Title :   An Energy Dense-AI-NaBH4-PEMFC Based Power Generator for Unmanned Undersea Vehicles


Descriptive Note : Technical Report,28 Jan 2013,31 Dec 2015


Corporate Author : University of Central Florida/Florida Solar Energy Center Orlando United States


Personal Author(s) : Muradov, Nazim


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1007683.pdf


Report Date : 01 Mar 2016


Pagination or Media Count : 47


Abstract : The main objective of this work is to develop a high-energy density air-independent power generator for UUVs based on a combination of polymer electrolyte membrane fuel cell (PEMFC) with a compact hydrogen generator utilizing AI-NaBH4 composite fuel. The conditions for the energy-dense and stable storage of NaBH4 slurries and dense solutions forthe extended period of time (6 months and longer) with minimal degradation rate (0.05-0.35% per month) have been determined. The effect of seawater on the kinetics of NaBH4 and AI-NaBH4 hydrolysis has been elucidated. Seawater minerals (especially, Mi+) showed catalytic effect on NaBH4 hydrolysis. The catalytic effect of AI hydrolysis products on the NaBH4 hydrolysis was studied. Continuous stable production of a stream of high-purity(99.999%, w/out water vapor) hydrogen by AI-NaBH4 hydrolysis in water and seawater at the temperature range of 90C has been demonstrated. A breadboard power generation unit consisting of NaBH4 delivery system, AI-NaBH4 hydrolysis reactor and PEMFC has been designed, assembled and performance tested. The unit's performance was comparable to that of PEMFC powered by high-purity H2 from a tank, which points to the high efficiency of the developed power generation system.


Descriptors :   unmanned , underwater vehicles , generators , polymer electrolyte fuel cells , sea water , hydrolysis , catalytic oxidation


Distribution Statement : APPROVED FOR PUBLIC RELEASE