Details

Autor(en) / Beteiligte

• Zhou, Qiusheng
• Tian, Yuan
• Wang, Mingyuan
• Lei, Shuangying
• Xiong, Chuanyin

Titel

Molten salt induced formation of chitosan based carbon nanosheets decorated with CoNx for boosting rechargeable Zn-air batteries

Ist Teil von

• Journal of colloid and interface science, 2023-07, Vol.641, p.842-852

Ort / Verlag

Elsevier Inc

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• In situ confinement of CoNx active sites within chitosan-based nitrogen-doped porous carbon nanosheet was reported. Both the experimental results and theoretical analysis shows the synergistic effect between nitrogen-doped porous carbon nanosheet and CoNx active sites can significantly shorten the electron transformation path, expedite oxygen adsorption and enhance the electronic conductivity. The rechargeable Zn-air battery delivers a higher power density of 189.9 mW cm−2 and gravimetric energy density of 1018.7 mWh g−1 at 10 mA cm−2, as well as excellent durability of over 500h. [Display omitted] The earth-abundant, low-cost, and efficient oxygen electrode materials offer a potential opportunity to satisfy the large-scale production and application of metal-air batteries. Herein, a molten salt-assisted strategy is developed to anchor transition metal-based active sites via in-situ confining into porous carbon nanosheet. As a result, a chitosan-based porous nitrogen-doped nanosheet decorated with the well-defined CoNx (CoNx/CPCN) was reported. Both structural characterization and electrocatalytic mechanisms demonstrate a prominent synergetic effect between CoNx and porous nitrogen-doped carbon nanosheets forcefully accelerates the sluggish reaction kinetics of oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Interestingly, the Zn-air batteries (ZABs) equipped with CoNx/CPCN-900 as an air electrode shows outstanding durability for 750 discharge/charge cycles, a high power density of 189.9 mW cm−2, and a high gravimetric energy density of 1018.7 mWh g−1 at 10 mA cm−2. Furthermore, the assembled all-solid cell displays exceptional flexibility and power density (122.2 mW cm−2).