Abstract：
Rising global temperatures and critical energy shortages have spurred researches into CO2 fixation and conversion within the realm of energy storage such as Zn-CO2 batteries. However, traditional Zn-CO2 batteries employ double-compartment electrolytic cells with separate carriers for catholytes and anolytes, diverging from the \"rocking chair\" battery mechanism. The specific energy of these conventional batteries is constrained by the solubility of discharge reactants/products in the electrolyte. Additionally, H2O molecules tend to trigger parasitic reactions at the electrolyte/electrode interfaces, undermining the long-term stability of Zn anodes. In this report, we introduce an innovative \"rocking chair\" type Zn-CO2 battery that utilizes a weak-acidic Zn(OTf)2 aqueous electrolyte compatible with both cathode and anode. This design minimizes side reactions on the Zn surface and leverages the high catalytic activity of the cathode material, allowing the battery to achieve a substantial discharge capacity of 6734 mAh g-1 and maintain performance over 65 cycles. Moreover, the successful production of pouch cells demonstrates the practical applicability of Zn-CO2 batteries. Electrode characterizations confirm superior electrochemical reversibility, facilitated by solid discharge products of ZnCO3 and C. This work advances a \"rocking chair\" Zn-CO2 battery with enhanced specific energy and a reversible pathway, providing a foundation for developing high-performance metal-CO2 batteries.
摘要：
全球气温上升和严重的能源短缺促使人们对诸如Zn-CO2电池之类的储能领域内的CO2固定和转化进行研究。然而,传统的Zn-CO2电池采用双室电解池，阴极电解液和阳极电解液具有单独的载体，从“摇椅”电池机构发散。这些常规电池的比能量受到放电反应物/产物在电解质中的溶解度的限制。此外,H2O分子倾向于在电解质/电极界面引发寄生反应，破坏了锌阳极的长期稳定性。在这份报告中,我们介绍了一种创新的“摇椅”型Zn-CO2电池，该电池采用与阴极和阳极兼容的弱酸性Zn（OTf）2水性电解质。这种设计最大限度地减少了Zn表面的副反应，并利用了阴极材料的高催化活性，允许电池实现6734mAhg-1的大量放电容量，并在65个循环内保持性能。此外，袋装电池的成功生产证明了Zn-CO2电池的实际适用性。电极表征证实了优异的电化学可逆性，由ZnCO3和C的固体放电产物促进。这项工作推进了具有增强比能量和可逆途径的“摇椅”Zn-CO2电池，为开发高性能金属CO2电池奠定了基础。
