Cheng Zhibin, Wu Ziyuan, Tang Yiyang, Fan Xi, Zhang Jindan, Chen Yilong, Xiang Shengchang, Zhang Zhangjing
Fujian Key Laboratory of Polymer Materials, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou 350007, China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, China.
Nanoscale. 2022 Oct 21;14(40):15073-15078. doi: 10.1039/d2nr04066b.
Rechargeable Li-CO batteries are an innovative energy storage technology with broad application prospects owing to their superb energy density and ability to capture the greenhouse gas CO. However, they are still suffering from severe challenges in the formation and decomposition of electrochemically sluggish LiCO discharge products, resulting in poor battery performance. Development of an efficient cathodic electrocatalyst has the potential to address these issues by catalytically boosting the conversion of LiCO. Herein, we have designed a Ru-Cu nanoalloy decorated porous carbon (Ru-Cu@NPC) material derived from an anion-exchanged cationic MOF, and it can serve as an efficient cathode electrocatalyst for Li-CO batteries. Benefitting from the uniform distribution of ultrafine Ru-Cu nanoalloys with high catalytic performance, Ru-Cu@NPC displays excellent CO reduction and evolution activities. Impressively, the Li-CO battery with the Ru-Cu@NPC catalyst exhibits a remarkably low potential gap of 0.93 V at 100 mA g and a stable discharge/charge cycling performance of more than 400 cycles at a high current density of 400 mA g within a limiting capacity of 1000 mA h g. The study provides an opportunity for the research of cationic MOF derived bimetallic catalysts in the Li-CO battery field.
可充电锂-二氧化碳电池是一种创新的储能技术，由于其出色的能量密度和捕获温室气体二氧化碳的能力而具有广阔的应用前景。然而，它们在电化学惰性的碳酸锂放电产物的形成和分解方面仍面临严峻挑战，导致电池性能不佳。开发一种高效的阴极电催化剂有可能通过催化促进碳酸锂的转化来解决这些问题。在此，我们设计了一种由阴离子交换阳离子金属有机框架衍生的钌-铜纳米合金修饰的多孔碳（Ru-Cu@NPC）材料，它可以作为锂-二氧化碳电池的高效阴极电催化剂。得益于具有高催化性能的超细钌-铜纳米合金的均匀分布，Ru-Cu@NPC表现出优异的二氧化碳还原和析出活性。令人印象深刻的是，采用Ru-Cu@NPC催化剂的锂-二氧化碳电池在100 mA g时具有0.93 V的极低电位差，并且在400 mA g的高电流密度下，在1000 mA h g的极限容量内具有超过400次循环的稳定充放电循环性能。该研究为锂-二氧化碳电池领域中阳离子金属有机框架衍生的双金属催化剂的研究提供了一个契机。
