Hollow urchin-shaped NCM811 ternary-structure for high rate charge/discharge capability and efficient CO2 adsorption

• Published in: Journal of environmental chemical engineering 2023-04, Vol.11 (2), p.109445, Article 109445
• Main Authors: Yang, Fan-Ming, Zhou, Xiao-Yao, Li, Xi-Da, Yi, Zhi-Cheng, Feng, Rong, He, Guo-Wen
• Format: Article
• Language: English
• Subjects: CO2 adsorption; Hollow; NCM811; Porous; Rate capability; Urchin-shaped
• ISSN: 2213-3437
• DOI: 10.1016/j.jece.2023.109445

A new type of hollow urchin-shaped NCM811 ternary-structure material was prepared for high rate charge/discharge capability and efficient CO2 adsorption. Ni2+/Ni3+, Co2+/Co3+ and Mn4+exist simultaneously in the NCM811 material, and the atomic ration of Ni: Co: Mn is close to 8: 1: 1. In KOH, the NCM811 material shows a pseudocapacitance behavior and achieves a remarkable specific discharge capacity of 208.3 F/g. When the current density is improved to 20 A/g, the capacity still keeps 52.3 %. The excellent rate capability is associated with the hollow urchin-shaped porous structure which provide fast ions migration, large reaction surface area and good heterometallic synergy. The CO2 adsorption results conform to the Bangham mode. At 25 °C, a large CO2 adsorption capacity of 3.66 mmol/g is achieved in a flow rate of 35 mL/min. The adsorption process may closely related to the large pore volume and abundant O2- basic sites. A new type of hollow urchin-shaped NCM811 ternary-structure material was prepared with a hydrothermal treatment at 160 °C. The hollow porous structure and the composition of Ni2+/Ni3+, Co2+/Co3+, Mn4+ and O2- are beneficial to the high rate charge/discharge capability and efficient CO2 adsorption. Compared with the discharge capacity at 1 A/g, it still keeps 52.3 % at 20 A/g. At 25 °C, a large CO2 adsorption capacity of 3.66 mmol/g is achieved in a flow rate of 35 mL/min. [Display omitted] •The hollow urchin-shaped NCM811 material with 2.01% micropores, 97.94% mesopores and 0.05% macropores is first prepared.•The formula of NCM811 could be generally expressed as [Ni8x2+Ni8(1−x)3+Co1−x2+Cox3+Mnx4+]O2.2 (0＜x＜1).•Compared with the specific discharge capacity at 1 A/g, it still keeps 52.3 % at 20 A/g.•At 25 °C, a large CO2 adsorption capacity of 3.66 mmol/g is also achieved in a flow rate of 35 mL/min.