Abstract:

A novel titanium-supported silver catalyst（Ag/Ti）with a 3D network structure was prepared by the hydrothermal process using polyethylene glycol as a reduction agent.Electrocatalytic activity of the Ag/Ti electrode towards borohydride oxidation was evaluated by cyclic voltammograms（CVs）.A direct oxidation process of borohydride on the Ag/Ti electrode was observed.The results showed that the Ag/Ti electrode presented a high anodic current density for borohydride oxidation，and the onset potential for borohydride oxidation was ca -0.64 V vs SCE at BH^-₄ concentration of 0.1 mol·L^-1.This indicated that the Ag/Ti electrode exhibited high electrocatalytic activity for borohydride oxidation and it would be a promising anode used in direct borohydride fuel cells.

Key words:

钛基银, 直接硼氢化物燃料电池, 电催化剂, 硼氢化物氧化

摘要： 利用水热法，以聚乙二醇为还原剂将硝酸银还原, 产生的金属银颗粒直接沉积于钛表面，制备出具有三维网状结构的新型钛基银电极 (Ag/Ti)。利用循环伏安（CV）技术研究了碱性溶液中，Ag/Ti对硼氢化钠氧化的电催化活性。结果表明，硼氢化物在Ag/Ti电极上的氧化属直接电化学氧化过程，Ag/Ti电极对硼氢化物的电化学氧化表现出极高的电流密度，并且硼氢化物氧化的起始电位较低，约为-0.64 V vs SCE，说明Ag/Ti电极对硼氢化物氧化具有高度的电催化活性，有望作为硼氢化物燃料电池的阳极材料而得到应用。

关键词:

钛基银, 直接硼氢化物燃料电池, 电催化剂, 硼氢化物氧化