Research group of Wang Yaobing, Fujian Institute of physical composition, Chinese Academy of Sciences: reversible water zn-co2 battery based on the mutual transformation of CO2 and HCOOH

Lead metal-co2 battery, as a promising technology of CO2 fixation / utilization and energy conversion / storage, has attracted many scholars' attention At present, metal-co2 batteries are mostly equipped with high active metal anodes and non-aqueous electrolyte systems, which have high operating voltage and energy density The discharge products of these non-aqueous metal-co2 batteries are mostly carbon, carbonate or oxalate, and the conversion / utilization of CO2 needs to be improved Recently, Wang Yaobing, researcher group of Fujian Institute of material structure, Chinese Academy of Sciences, proposed and prepared a reversible water zn-co2 battery based on the mutual transformation of CO2 and HCOOH The related results were published in angelw Chem Int ed (DOI: 10.1002 / anie 201811853) Research achievements of researcher Wang Yaobing: Based on the mutual transformation of CO 2 and HCOOH, the reversible water system Zn CO 2 battery was successfully synthesized with the method of hydrogen evolution assisted electrodeposition, which has the special micro scale dendrite structure, micro nano scale particle structure and nano scale internal cross-linking structure The three-dimensional porous PD has rich edge and pore structure, and its rich electrochemical active surface promotes the spontaneous reaction of CO2 reduction (cdrr) to HCOOH and HCOOH selective oxidation (FAO) to CO2 at low overpotential, which provides the possibility for the spontaneous reaction of water zinc anode driving CO2 reduction to HCOOH (source: angelw Chem Int ed.) in a three electrode system, the CO 2 selective reduction of 3D porous PD was investigated in 0.1M NaCl solution HCOOH is the only product of cdrr in potentiostatic electrolysis When the overpotential is 180 MV, the Faraday efficiency of HCOOH is 66%; when the overpotential is 380 MV, the Faraday efficiency of HCOOH is 89% (Figure 2D) When PD was used as catalyst, the HCOOH selectivity of cdrr at low overpotential was much better than that of competitive her reaction Cyclic voltammetry (CV) was used to investigate the electrocatalytic activity of three-dimensional porous PD for HCOOH oxidation in neutral solution The peak current density of Pd catalyst at + 0.42 V (vs rhe) was 3.7 Ma · cm − 2 (Figure 2e) In addition, only one group of reduction and oxidation peaks were observed before 0.7 V, indicating that HCOOH is mainly oxidized directly to CO2 (involving HCOO · adsorption intermediate) (source: angelw Chem Int ed.) in the design and assembly of water reversible zn-co2 battery, the author uses two opposite direction bipolar membranes (BPM) to realize the two chamber charging and discharging process (Figure 3) In the process of discharge, zinc anode dissolves and electrons are released At the same time, CO2 to HCOOH conversion is carried out on PD cathode During the charging process, zinc is formed on zinc anode, and HCOOH → CO2 conversion occurs simultaneously on PD cathode Therefore, the reversible Zn CO 2 battery can be realized by the cyclic discharge and charging process of CO 2 and HCOOH Under the given conditions, the open circuit potential is 0.89 V, and the theoretical discharge capacity is 788 wh · kg - 1, which reaches the level of water zinc energy conversion / storage device At the current density of 0.56 Ma · cm - 2, the voltage difference between the initial discharge voltage and the charging voltage is only 0.19 V, the energy efficiency is 81.2%, and the voltage difference increases only 0.08 V after 10 hours This method realizes the reversible conversion of CO2 and liquid HCOOH, and provides a more potential and green alternative for CO2 fixation / utilization and energy conversion / storage (source: angelw Chem Int ed.) the author proposed and prepared a reversible aqueous zn-co2 battery based on the mutual conversion of CO2 and liquid HCOOH The battery is based on the green water electrolyte, which realizes the efficient and reversible utilization of CO2 greenhouse gas, and the non-solid discharge products make it have good cycle performance The above work was published on angelw Chem Int ed by Jiang Xie (co authored), Xueyuan Wang (co authored), Jiangquan LV, Yiyin Huang, Maoxiang Wu, Yaobing Wang, Jiannian Yao The above research work was supported by the natural science foundation of China and the natural science foundation of Fujian Province Review of previous reports: Wang Yaobing, Fujian Institute of physical architecture, Chinese Academy of Sciences: functional covalent organic skeleton materials for direct storage of solar energy to electrochemical energy Today, science and technology elements are increasingly valued in economic life, China has ushered in the "node of science and technology explosion" Behind the progress of science and technology is the work of countless scientists In the field of chemistry, in the context of the pursuit of innovation driven, international cooperation has been strengthened, the influence of Returned Scholars in the field of R & D has become increasingly prominent, and many excellent research groups have emerged in China For this reason, CBG information adopts the 1 + X reporting mechanism CBG information, chembeangoapp, chembeango official microblog, CBG wechat subscription number and other platforms jointly launch the column of "people and scientific research", approach the domestic representative research group, pay attention to their research, listen to their stories, record their demeanor, and explore their scientific research spirit.