Yang Rui, Peng Zhen, Xie Jiafang, Huang Yiyin, Borse Rahul Anil, Wang Xueyuan, Wu Maoxiang, Wang Yaobing
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Yang Qiao West Road 155#, Fuzhou, 350002, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
ChemSusChem. 2020 May 22;13(10):2621-2627. doi: 10.1002/cssc.201903297. Epub 2020 Mar 18.
Metal-CO batteries, an attractive technology for both energy storage and CO utilization, are typically classified into organic Li(Na)-CO batteries with a high energy density/output voltage and aqueous Zn-CO batteries with flexible chemical production. However, achieving both high-efficiency energy storage and flexible chemical production is still challenging. In this study, a reversible hybrid aqueous Li-CO battery is developed, integrating Li with an aqueous phase, which exhibits not only a high operating voltage and energy density but also highly selective formic acid production. Based on a Li plate as the anode, NaCl solution as the aqueous electrolyte, solid electrolyte Li Al Ge P O (LAGP) as a separator and Li transporter, and a bifunctional Pd-based electrocatalyst as the cathode, the resulting battery shows a high discharge voltage of up to 2.6 V, an outstanding energy conversion efficiency of above 80 %, and remarkable selectivity of CO -to-HCOOH conversion of up to 97 %. The related reaction mechanism is proposed as CO +2 Li+2 H ⇌HCOOH+2 Li .
金属-CO电池是一种在能量存储和CO利用方面都颇具吸引力的技术，通常分为具有高能量密度/输出电压的有机锂（钠）-CO电池和具有灵活化学品生产能力的水系锌-CO电池。然而，要同时实现高效能量存储和灵活化学品生产仍然具有挑战性。在本研究中，开发了一种可逆混合水系锂-CO电池，将锂与水相集成，该电池不仅具有高工作电压和能量密度，还能实现高选择性甲酸生产。基于锂片作为阳极、NaCl溶液作为水系电解质、固体电解质LiAlGePO（LAGP）作为隔膜和锂传输体，以及双功能钯基电催化剂作为阴极，所得电池显示出高达2.6 V的高放电电压、超过80%的出色能量转换效率以及高达97%的CO转化为HCOOH的显著选择性。提出相关反应机理为CO + 2Li + 2H ⇌ HCOOH + 2Li 。
