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AKE: Arbeitskreis Energie

AKE 4: Renewable Energy - Photovoltaics and Electronic Processes

AKE 4.4: Vortrag

Montag, 16. März 2020, 16:00–16:15, DÜL

Simultaneous CO2 fixation and power generation using aqueous Al-CO2 batteries — •Pan Ding¹, Yanguang Li², and Ian Sharp¹ — ¹Walter Schottky Institut, TUM, Munich, Germany — ²Institute of Functional Nano & Soft Materials, Suzhou, China

The energy crisis and excessive emission of CO2 caused by the sharp depletion of fossil energy are two biggest challenges facing humanity. The capture and fixation of CO2 by metal-CO2 batteries have been proposed as *killing two birds with one stone* devices. Here, we reported that 2D Bi nanosheets could be prepared from cathodic conversion of Bi2S3 nanoribbons. It can enable the efficient and robust CO2 reduction to formate at a peak FE of almost 100% (-0.59 V with an initial current density of up to ~208 mA/cm2). Primary Al-CO2 flow battery with Bi2S3 NRs exhibited high formate selectivity at the cathode during discharging. When working at a short-circuit state (0 V), the Al-CO2 battery will transform into a CO2 electrolyzer, and thus highly efficient electrochemical CO2 conversion to formate is available in a power free manner. Moreover, when using recycled Al foils from beverage cans as the source of anode material and photocathodes, the electrochemical performance could be further enhanced in a hybrid solar-driven AlCO2 battery. Therefore, it provides a new solution to electrochemical fixation and utilization of CO2 in a low-cost and green way.