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Study of the Electrooxidation of Borohydride on Directly Formed CoB/Ni-foam Electrode and Its Application in Membraneless Direct Borohydride Fuel Cells

Abstract

As a promising energy source, direct borohydride fuel cells (DBFCs) had attracted a lot of attention. Since the electrooxidation of BH4- always accompanied hydrolysis reaction, the energy density of DBFCs was close related to the composition and structure of the anode. The formation of hydrogen formed by the hydrolysis of BH4- and the high exothermic nature of the reaction as well as the strong basicity of the fuel put strict demands for the stability of the anode. Consequently, the designation and fabrication ideal anode were effective routes to enhance the performance of DBFCs. By comprehensive considering the convenience, electric/thermal conductivity of the electrode, diffusion of reactants/products and effective cost, the electroless plating method was adopted and the CoB anode was directly formed on Ni-foam substrate. The anode showed high electrocatalytic activities on electrooxidation of NaBH4 with low CoB loading amount. Especially, the anode showed distinct stability compared to the CoB plate prepared by pressed method and the catalytic activity could retain 65% after accelerate life time test of 500 cyclic voltammetry cycles which was benefit from the strong interactions between the CoB particles and Ni-foam substrate. Among all the investigated anode, the CoB/Ni-foam electroless deposited for 7 times showed the best performance. It was applied in a membraneless DBFC which showed a maximum power density of 230 mW cm-2 in 1 mol L-1 NaBH4 + 3 mol L-1 NaOH at 313 K. These characteristics made electroless plating CoB/Ni-foam catalyst exhibited enormous potential as anode for practical application in DBFCs.

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Publication details

The article was received on 21 Apr 2017, accepted on 12 Jul 2017 and first published on 12 Jul 2017


Article type: Paper
DOI: 10.1039/C7TA03464D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Study of the Electrooxidation of Borohydride on Directly Formed CoB/Ni-foam Electrode and Its Application in Membraneless Direct Borohydride Fuel Cells

    S. Guo, J. Sun, Z. Zhang, A. Sheng, M. Gao, Z. Wang, B. Zhao and W. Ding, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03464D

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