摘要
采用简单热处理方式制备了空气电极用氧还原电催化剂Co-N/C(800),利用线性电位扫描、控电流极化曲线及单电池测试等方法评价Co-N/C(800)的氧还原反应(ORR)催化活性。结果表明:该催化剂在碱性溶液中(1 mol/LNaOH)对ORR有很好的催化活性,起始氧还原电位约为0.04 V(vs.Hg/HgO);在室温及空气气氛条件下,以Co-N/C(800)制备的空气电极在7 mol/L NaOH溶液中时性能最佳,在电极电位为-0.6 V(vs.Hg/HgO)时电流密度达100 mA/cm2;自制的空气电极与纯锌片所组装的锌-空气电池,以7 mol/L NaOH为电解液,在电池过电位为0.8 V时,电流密度超过了100 mA/cm2,催化性能优于常规MnO2催化剂;同时进行了单电池放电测试,放电平台保持在1.25～1.30 V且性能稳定。
A non-noble metal oxygen reduction reaction （ORR）catalyst labeled as Co-N/C （800）was prepared by heat-treatment process. The electrocatalytic activity to ORR was investigated in alkaline solution by linear sweep voltammetric curves, polarization curves, as well as single fuel cell tests. The results show that the catalytic activity of Co-N/C（800） to ORR is good with an onset po- tential of 0. 04 V（ vs. Hg/HgO）. Besides, a current density of 100mA/cm2at-0. 6 V（ vs. Hg/HgO）could be obtained on the air-elec- trode using Co-N/C（800） as an electrocatalyst in 7 mol/L NaOH solution on the condition of room temperature and air atmos- phere. The negative electrode of pure zinc and the electrolyte 7 mol/L NaOH were selected in the zinc-air cell, and the current den- sity exceeds 100mA/cm2 at 0. 8 V,which is superior to MnO2catalyst. More importantly, the results of single cell test indicated that the cell discharge voltage remain at 1.25 V ~ 1.30 V and the performance is very stable.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2013年第3期287-291,共5页
Chemical Research and Application
基金
中央高校基本科研业务费专项资金重庆大学创新人才培养计划建设项目(CDJXS11220004)资助
重庆市自然科学基金项目(CSTC2009BB4214)资助
