Anodic behavior of Ag metal electrode in direct borohydride fuel cells

Agni-catalyzed anode for direct borohydride fuel cells

“…In the presence of BH − 4 , an obvious oxidation peak current arises at −0.3 V and rises up sharply at −0.2 V, implying the electrochemical oxidation of BH − 4 ions. Recently, Chatenet et al [14] and Sanli et al [15] reported the similar CV behaviors of Ag electrode in alkaline borohydride solutions and attributed the oxidation current to be catalyzed by the surface oxides of Ag. This explanation seems to be reasonable because the onset of BH − 4 oxidation appears always at the very positive potential, at which a number of surface oxides should be formed on Ag in pure alkaline solution.…”

“…Very recently, Chatenet et al [14] reported a near 8e oxidation of sodium borohydride on Ag surface, observed from linear voltammograms and chronopotentiograms. Also, Sanli et al [15] found that the number of electrons transferred from borohydride oxidation on Ag surface was ∼ 6 as derived from their coulometric studies. Although BH − 4 ions can be directly oxidized with 8e transfer on Au and Ag metals, its anodic kinetics is very slow, resulting in significant voltage loss.…”

Impact of key deposition parameters on the morphology of silver foams prepared by dynamic hydrogen template deposition

“…The aim of the current work is to study the effect of the deposition parameters (deposition potential and deposition time) and electrolyte content on the morphology of the porous silver. The final goal is to find a trend in the optimization of conditions for the production of silver electrodes most suitable for electrochemical applications, in areas where Ag electrodes were already employed, such as alkaline and direct borohydride fuel cells [24][25][26], double layer supercapacitors [27,28], batteries [29], sensors [30] or electrodes for electrocatalysis [31][32][33]. This is accomplished by analysis of the electrode morphology and by measuring the electrolyte accessible surface area.…”

Investigation of carbon-supported Ni@Ag core-shell nanoparticles as electrocatalyst for electrooxidation of sodium borohydride

“…In the past few years, various metals have been studied as the anode electrocatalysts for DBFC, such as Pt [9][10][11], Pd [12,13], Ni [14,15], Cu [16], Co [17,18] known as Bcatalytic electrodes,^and Au [4,5,19,20], Ag [4,10,11,21], known as Bnon-catalytic electrodes.^Although Ag exhibits excellent activity toward the oxidation of borohydride and is presented as a non-catalytic material with respect to BH 4 -hydrolysis, the slow electrode kinetics and low power densities indicate that Ag cannot be used alone [11,22]. Thus, it is essential to design new and effective Ag-based composite catalysts with superior performance.…”