Electrochemical Oxidation of Borohydride on Cu Electrode

Abstract

The electrochemical behavior of BH4- on Cu electrode in 1M NaOH was investigated by cyclic voltammetry(CV) in the potential range of -1.2V to 0.4V versus Hg/HgO. The CV results show that Cu electrode has obvious catalytic activities to the BH4- hydrolysis which belongs to ‘catalytic’ electrode materials. The BH4- electro-oxidation process on Cu is complex and it could associate with the BH4- hydrolysis reaction, followed by oxidation of the intermediate H, then, the intermediate product (e.g. BH3OH−) oxidized, and direct oxidation of BH4- at more positive potentials.

Electrocatalyst Design for Direct Borohydride Oxidation Guided by First Principles

“…7,34 . Though it shows activity for borohydride oxidation, the Cu electrode oxidizes at potentials near that at which borohydride is oxidized.…”

Plastic supported platinum modified nickel electrode and its high electrocatalytic activity for sodium borohydride electrooxidation

“…NaBH 4 owns a high hydrogen contents (10.6 wt%) and the complete electrooxidation of NaBH 4 generates 8 electrons (Eq. 1) [5,[11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27]. Besides, NaBH 4 is non-toxic and exhibits a good stability in alkaline solution and the electrooxidation of NaBH 4 does not release any pollutant.…”

“…AB 5 -type alloys [3][4][5]) and transition metals (e.g. Ni [17,18], Co [19], Cu [20], Zn [21]) are alternative low cost catalysts for the electrooxidation of NaBH 4 . However, most of them suffer the drawback of lower catalytic performance compared with noble metals (e.g.…”

Low-cost and binder-free, paper-based cobalt electrode for sodium borohydride electro-oxidation

“…9,10 Nowadays, sodium borohydride (NaBH 4 ), a promising hydrogen storage material with high hydrogen content (10.6 wt%), high energy density (9.3 W h g À1 ), high chemical stability in alkaline solution, non-toxic, and easy handling has been employed as anode fuel for direct borohydride fuel cells (DBFCs) and has attracted considerable attention. [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] In addition, the complete electro-oxidation of NaBH 4 generates eight electrons (eqn (1)), [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] which is higher than the electro-oxidation of hydrogen, [6][7][8] hydrazine, 9 methanol, 31 and ethanol.…”

“…AB 5 and AB 2 -type alloys) [24][25][26] and transition metals (e.g. Ni, Cu, Zn and Co) 24,[27][28][29][30] have become alternative low-cost catalysts for NaBH 4 electrooxidation, but they have lower catalytic activity than that of precious metals. Thus, preparing non-precious catalysts with high catalytic activity is significant for the development of lowcost and high-performance DBFCs.…”