Article

A comprehensive review of direct borohydride fuel cells

Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH 43210, USA
Renewable and Sustainable Energy Reviews (Impact Factor: 5.51). 01/2010; 14(1):183-199. DOI: 10.1016/j.rser.2009.08.002

ABSTRACT A direct borohydride fuel cell (DBFC) is a device that converts chemical energy stored in borohydride ion (BH4−) and an oxidant directly into electricity by redox processes. Usually, a DBFC employs an alkaline solution of sodium borohydride (NaBH4) as fuel and oxygen or hydrogen peroxide as oxidant. DBFC has some attractive features such as high open circuit potential, ease of electro-oxidation of BH4− on non-precious metals such as nickel, low operational temperature and high power density. The DBFC is a promising power system for portable applications. This article discusses prominent features of DBFC, reviews recent developments in DBFC research, and points out future directions in DBFC research.

Download full-text

Full-text

Available from: Nurul A. Choudhury, Apr 01, 2015
6 Followers
 · 
463 Views
  • Source
    • "This will reduce the half-cell potential of the cathode because H 2 O 2 electrochemical reduction is more favorable at low pH [13]. The pH dependence of the half-cell potential of the H 2 O 2 reduction reaction is given in equation (1) [5]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Direct borohydride fuel cells (DBFCs) using liquid hydrogen peroxide as the oxidant are safe and attractive low temperature power sources for unmanned underwater vehicles (UUVs) as they have excellent energy and power density and do not feature compressed gases or a flammable fuel stream. One challenge to this system is the disparate pH environment between the anolyte fuel and catholyte oxidant streams. Herein, a bipolar interface membrane electrode assembly (BIMEA) is demonstrated for maintaining pH control of the anolyte and catholyte compartments of the fuel cell. The prepared DBFC with the BIMEA yielded a promising peak power density of 110 mW cm(-2). This study also investigated the same BIMEA for a hydrogen-oxygen fuel cell (H-2-O-2 FC). The type of gas diffusion layer used and the gas feed relative humidity were found to impact fuel cell performance. Finally, a BIMEA featuring a silver electrocatalyst at the cathode in a H-2-O-2 FC was successfully demonstrated. Copyright
    International Journal of Hydrogen Energy 09/2014; 39(26):14312–14321. DOI:10.1016/j.ijhydene.2014.04.099 · 2.93 Impact Factor
  • Source
    • "BH 4 − /OH − /H 2 O [19] [20] [21] [22] [23] [24] "
    01/2014; 2014:1-10. DOI:10.1155/2014/670209
  • Source
    • "Hydrogen is an ideal energy carrier; therefore, the binary boron-hydrogen compounds or boranes are the core of hydrogen storage and are an extremely rich area of boronbased cluster chemistry. In addition, the borohydride complexes NaBH 4 and LiBH 4 possess a high capacity for hydrogen retention, and the release of hydrogen from NaBH 4 is only possible via hydrolysis [1] [2] [3] [4]. Many salts of this anion, such as LiBH 4 and NaBH 4 , are essentially ionic and have been used for nearly 60 years as reducing agents [5]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Ab initio calculations were used to analyze interactions of with 1–4 molecules of NH3 at the MP2/6-311++G(d,p) and the B3LYP/6-311++G(d,p) computational levels. In addition to H3B–H⋯H–NH2 dihydrogen bond, the H2N–H⋯NH3 hydrogen bonds were also predicted in clusters. Negative cooperativity in clusters constructed from mixed H3B–H⋯H–NH2 dihydrogen and H2N–H⋯NH3 hydrogen bonds are more remarkable. The negative cooperativity increases with size and number of hydrogen bonds in cluster. The B–H stretching frequencies show blue shifts with respect to cluster formation. Greater blue shift in stretching frequencies was predicted for B–H bonds which did not contribute to dihydrogen bonding with NH3 molecules. The structures were analyzed with the atoms in molecules (AIM) methodology.
    08/2013; 2013. DOI:10.1155/2013/194836
Show more