氧化镧作为直接硼氢化物燃料电池阴极催化剂的研究

Study on La_2O_3 as a Cathode Catalyst for Direct Borohydride Fuel Cell

通过采用线性电势扫描(LSV)和恒电流计时电势扫描方法对氧化镧作为直接硼氢化物燃料电池阴极催化剂的电化学性能进行了研究。实验结果表明:在单室燃料电池体系中,氧化镧对氧还原具有良好的活性,同时在强碱溶液中对硼氢根离子具有很强的稳定性且对硼氢根的水解没有任何促进作用。以镍基储氢合金作为电池的阳极催化剂组装成简单的单室燃料电池,电池的开路电压达到1.052 V,在常温下(21℃),电池于0.491 V获得最高功率密度65.25 mW.cm-2,电池运行稳定。

The electrochemical performance of La2O3 as a cathode catalyst for direct borohydride fuel cell was investigated by LSV and chronopotentiometry.The experimental results indicated that the La2O3 showed not only a high electro-catalytic activity for the oxygen electo-reduction but also a high immunity to the electro-oxidation and hydrolization of BH-4.The assembled simple membraneless fuel cell using La2O3 as cathode and hydrogen storage alloy as anode exhibited a peak power density of 65.25 mW·cm-2 at 0.491 V under ambient condition（21 ℃）.