单原子分散的Ir-N-C燃料电池阳极抗中毒催化剂

Atomic Dispersion Ir-N-C Catalysts for Anode Anti-poisoning Electrolysis in Fuel Cell

燃料电池的阳极抗中毒研究是重要课题,探索具有超高质量活性和抗CO毒化的阳极催化剂具有显著的科学意义和应用价值。本文成功制备了Ir原子级别分散在N掺杂碳的载体上的新催化剂,并且发现该Ir-N-C对甲酸具有良好的电催化氧化性能,其质量比活性为商业Pd/C的48倍。组装了燃料电池单电池进行测试,结果显示,Ir-N-C催化剂在单电池中的质量比功率密度高达281 mW/mg,较商业Pd/C催化剂提升了3倍。同时,Ir-N-C对CO毒化的耐受性大大增强,经过14000 s的长期测试后,其活性仅衰减68%,优于商业Pd/C催化剂(衰减85%)。并且,该催化剂能够简单有效的大批量制备,为单原子催化剂的大批量制备提供了新思路。

The anti-poisoning behavior of the anode catalyst,especially the tolerance to CO,is of vital importance for the widespread application of fuel cells.Herein,we successfully synthesize an Ir based catalyst in atomic dispersion.The Ir-N-C catalyst has excellent electrocatalytic performance for formic acid oxidation,which represents the mass activity that is 48 times of the commercial Pd/C.In a single cell,the Ir-N-C catalyst represents a mass specific power density at 281 m W/mg,which is 3 times higher than of the Pd/C catalyst.Furthermore,the Ir-N-C catalysts show amazing CO anti-poisoning performance.After a long-term test of14000 s,its activity only decays by 68%,which is much better than commercial Pd/C catalysts(85%).In addition,the catalyst can be easily prepared,which provides a new path for the large-scale preparation of single-atom catalysts.