Efficient CO2 utilization and sustainable energy conversion via aqueous Zn-CO2 batteries. (May 2023)

• Record Type: Journal Article
• Authors: Kaur, Sukhjot; Kumar, Mukesh; Gupta, Divyani; Mohanty, Prajna Parimita; Das, Tisita; Chakraborty, Sudip; Ahuja, Rajeev; Nagaiah, Tharamani C.
• Is Part Of: Nano energy. Volume 109(2023)
• Publication Date: 2023-05
• Subjects: Zn-CO2 battery -- Carbon dioxide reduction -- Bifunctional catalyst -- Boron and nitrogen containing carbon -- Energy storage and conversion -- Oxygen evolution reaction; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2023.108242
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: Looking towards the economical and efficient carbon dioxide (CO2 ) utilization, metal-CO2 batteries uphold a great potential to enhance the efficiency of CO2 conversion to fuels. Pertaining to this, we have fabricated B, N-containing carbon with tubular morphology (C-BN@600) derived from ionic liquid (IL) and metal-organic framework (MOF) composite as cathode catalyst with Zn foil anode for aqueous rechargeable Zn-CO2 battery. The C-BN@600 catalyst demonstrate a remarkable activity towards electrochemical CO2 reduction to methanol with a Faradaic efficiency of 74% and a Yield rate of 2665 μg h −1 mg −1 cat. . The assembled battery consumes CO2 continuously and electrochemically convert it to methanol during discharge and simultaneously produces electrical energy with a remarkable energy density of 330 Wh kg −1 and a power density of 5.42 mW cm −2 which is stable for more than 12 days (>300 h, 800 cycles) at 1 mA cm −2, providing a platform to serve a dual purpose of CO2 reduction and energy storage. Graphical Abstract: CO2 conversion to methanol and its use in a rechargeable Zn-CO2 battery was explored on boron and nitrogen-doped carbon nanotubes as catalyst for CO2 reduction and oxygen evolution reaction. The assembled cell demonstrated the maximum power density of 5.4 mW cm -2 . ga1 Highlights: B and N-containing carbon (C-BN@600) was studied for the formation of a value-added product by e-CO2 R. CH3 OH was obtained with a F.E. of 74% at − 0.45 V vs. RHE. Zn-CO2 battery exhibited and a high maximum power density of 5.4 mW cm −2 . It showed an excellent cycling durability of more than 300 h (800 cycles) at 1 mA cm −2 . The assembled battery showed remarkable energy density of 343 Wh kg −1 and energy efficiency of 57.5% @ 1 mA cm −2 .