Cu纳米颗粒负载N掺杂生物质炭及其在锌空气电池中的应用

Cu nanoparticles in N-doped biomass carbon for Zn-air battery

开发非贵金属氧还原催化剂是提高锌空气电池效率的关键。因此,合成了N掺杂生物质炭负载Cu纳米颗粒,碳源为小麦秸秆,此催化剂具有优异的电催化活性和氧还原反应(ORR)的稳定性。Cu-N-C电催化剂的起始过电位为0.89V(vs.RHE),半波电位为0.79V(vs.RHE),氧还原反应的极限电流密度为4.92mA/cm^(2)。作为空气阴极,组装好的锌空气电池表现出较小的充放电电压间隙(在10mA/cm^(2)条件下为0.71V)和214mW/cm^(2)的高功率密度,优于商用Pt/C催化剂。此外,锌空气电池具有出色的耐用性。

Developing non-precious-metal oxygen reduction(ORR) catalysts is major task for promoting the reaction efficiency of Zn-air batteries.An advanced Cu nanoparticles derived from N-doped carbon(low-cost wheat straw) with superior electrocatalytic activity and stability toward oxygen reduction reaction(ORR) was synthesized.Cu-N-C electrocatalyst that achieved the onset potential of 0.89 V(vs.RHE) and half wave potential of 0.79 V(vs.RHE) as well as large diffusion-limited current density of 4.92 mA/cm^(2) for the oxygen reduction reaction.As the air-cathode,the assembled aqueous Zn-air battery exhibited small charge-discharge voltage gap(0.71 V@10 mA/cm^(2)) and high power density of 214 mW/cm^(2),outperforming the commercial Pt/C catalyst.Additionally,the Zn-air battery exhibited excellent durability.