Reversible Hybrid Aqueous Li-CO2 Batteries with High Energy Density and Formic Acid Production.,ChemSusChem

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Reversible Hybrid Aqueous Li-CO2 Batteries with High Energy Density and Formic Acid Production.
ChemSusChem ( IF 7.5 ) Pub Date : 2020-02-10 , DOI: 10.1002/cssc.201903297
Rui Yang _{1,

2} , Zhen Peng _{1,

2} , Jiafang Xie ₁ , Yiyin Huang ₁ , Rahul Anil Borse _{1,

2} , Xueyuan Wang _{1,

2} , Maoxiang Wu ₁ , Yaobing Wang ₁

Affiliation

Metal-CO2 batteries, an attractive technology for both energy storage and CO2 utilization, are typically classified into organic Li(Na)-CO2 batteries with a high energy density/output voltage and aqueous Zn-CO2 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-CO2 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 Li1.5 Al0.5 Ge1.5 P3 O12 (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 CO2 -to-HCOOH conversion of up to 97 %. The related reaction mechanism is proposed as CO2 +2 Li+2 H+ ⇌HCOOH+2 Li+ .

中文翻译：

具有高能量密度和甲酸产生能力的可逆混合式Li-CO2水性含水电池。

金属CO2电池是一种既能存储能量又能利用CO2的有吸引力的技术，通常分为具有高能量密度/输出电压的有机Li（Na）-CO2电池和化学生产灵活的水性Zn-CO2电池。然而，实现高效的能量存储和灵活的化学生产仍然是挑战。在这项研究中，开发了一种可逆混合型Li-CO2水性电池，它将Li与水相结合，不仅显示出高工作电压和能量密度，而且还显示出高选择性的甲酸生产。以Li板为阳极，NaCl溶液为水电解质，Li1.5 Al0.5 Ge1.5 P3 O12（LAGP）固体电解质为隔板和Li +传输器，双功能Pd基电催化剂为阴极，所得电池显示出高达2.6 V的高放电电压，出色的80％以上的能量转换效率，以及高达97％的出色的CO2-HCOOH转化率。提出了相关的反应机理为CO2 +2 Li + 2 H +⇌HCOOH+ 2 Li +。

更新日期：2020-02-10

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