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A metal free electrocatalyst for high-performance zinc-air battery application with good resistance towards poisoning species
Carbon ( IF 10.9 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.carbon.2020.03.036
Tayyaba Najam , Syed Shoaib Ahmad Shah , Hassan Ali , Zhaoqi Song , Haohao Sun , Zhengchun Peng , Xingke Cai

Abstract The trace amount of poisoning species in air, such as SOx and NOx, greatly degrade the performance of zinc-air battery, as they block the active sites of conventional metal containing electrocatalysts. To overcome this challenge, a catalyst with enhanced electrocatalytic properties and good resistance towards the small molecular poisons should be prepared. In this work, we synthesized a P, N dual-doped porous carbon nanospheres (DDPCN), which showed an Eonset and E1/2 of 0.98 V and 0.87 V for ORR reduction in alkaline solution, and a Tafel slop of 72 mV/dec, over-performing all the other metal-free catalysts and comparable with the performance of state-of-the-art Pt/C (20 wt%). Moreover, the E1/2 for DDPCN showed negligible change towards poisoning species; while the E1/2 for Pt/C and typical CoOx/CNTs displayed 10/10 mV and 24/13 mV decay by adding trace amount of SO32−/NO2− into the electrolyte solution. By using DDPCN as the electrocatalyst for zinc-air battery application, the device showed the highest open circuit voltage (1.48 V), the highest power density (224 mW cm−2) and the highest energy density (874 W h kg−1) among all metal-free catalysts, and their performances are even better than the Pt/C catalyst. Moreover, these performances showed negligible influence by the poisoning species for DDPCN based Zn-air battery, while the performances for Pt/C and CoOx/CNTs based Zn-air batteries were greatly deteriorated by the poisoning species up to 25% and 40%.

中文翻译:

一种用于高性能锌空气电池应用的无金属电催化剂,具有良好的抗中毒物种能力

摘要 空气中微量的有毒物质,如 SOx 和 NOx,会极大地降低锌空气电池的性能,因为它们会阻断传统含金属电催化剂的活性位点。为了克服这一挑战,应该制备一种具有增强的电催化性能和对小分子毒物具有良好抵抗力的催化剂。在这项工作中,我们合成了 P、N 双掺杂多孔碳纳米球 (DDPCN),其在碱性溶液中的 ORR 降低的 Eonset 和 E1/2 分别为 0.98 V 和 0.87 V,Tafel 斜率为 72 mV/dec ,优于所有其他不含金属的催化剂,可与最先进的 Pt/C (20 wt%) 的性能相媲美。此外,DDPCN 的 E1/2 对中毒物种的变化可以忽略不计;而 Pt/C 和典型 CoOx/CNT 的 E1/2 显示 10/10 mV 和 24/13 mV 通过向电解质溶液中添加微量 SO32-/NO2- 衰减。通过使用 DDPCN 作为锌空气电池应用的电催化剂,该装置表现出最高的开路电压(1.48 V)、最高的功率密度(224 mW cm-2)和最高的能量密度(874 W h kg-1)在所有无金属催化剂中,其性能甚至优于 Pt/C 催化剂。此外,DDPCN 基锌空气电池的中毒物质对这些性能的影响微乎其微,而 Pt/C 和 CoOx/CNTs 基锌空气电池的性能因中毒物质而大大恶化,最高可达 25% 和 40%。该装置在所有无金属催化剂中表现出最高的开路电压(1.48 V)、最高的功率密度(224 mW cm-2)和最高的能量密度(874 W h kg-1),其性能甚至更好与 Pt/C 催化剂相比。此外,DDPCN 基锌空气电池的中毒物质对这些性能的影响微乎其微,而 Pt/C 和 CoOx/CNTs 基锌空气电池的性能因中毒物质而大大恶化,最高可达 25% 和 40%。该装置在所有无金属催化剂中表现出最高的开路电压(1.48 V)、最高的功率密度(224 mW cm-2)和最高的能量密度(874 W h kg-1),其性能甚至更好与 Pt/C 催化剂相比。此外,DDPCN 基锌空气电池的中毒物质对这些性能的影响微乎其微,而 Pt/C 和 CoOx/CNTs 基锌空气电池的性能因中毒物质而大大恶化,最高可达 25% 和 40%。
更新日期:2020-08-01
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