J. Mater. Sci. Technol. ›› 2024, Vol. 171: 209-221.DOI: 10.1016/j.jmst.2023.06.033

• Research Article • Previous Articles     Next Articles

Hydrolysis mechanism of YbB2C2 and the microstructure of the carbon derived from the hydrolysis reaction

Zhihui Lia,b,c,1, Hao Zhanga,b,1, Jixin Chena,*, Jiemin Wanga,*, Xiaohui Wanga, Jinxing Yanga,b, Chao Zhanga, Zerong Zhanga,b, Hongyang Liua, Fei Huanga,b, Meishuan Lia, Fei Lic,*   

  1. aShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;
    bSchool of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;
    cShanghai Key Laboratory for High Temperature Materials and Precision Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • Received:2023-04-06 Revised:2023-04-06 Accepted:2023-04-06 Published:2024-02-01 Online:2023-07-27
  • Contact: *E-mail addresses: .jxchen@imr.ac.cn (J. Chen), jieminwang@imr.ac.cn (J. Wang), lifei74@sjtu.edu.cn (F. Li)
  • About author:1 The authors contributed equally to this work.

Abstract: Carbide-derived carbon (CDC) materials have gained great attention due to the excellent properties for various potential applications. Here, graphite crystal is formed during a room-temperature hydrolysis process of layered compound YbB2C2. The formation mechanism can be demonstrated by a YbB2C2 molecular cell: Yb3+ acts as a cathode where H2O molecule is reduced to H atom and OH- ion, while (B2C2)3- acts as an anode where OH- ion is oxidized to O atom. Then, YbB2C2 molecular cell begins to disintegrate, i.e., Yb3+ ion, B and C atoms dissociate from the molecular cell. The as-produced C atoms combine to form graphite crystal. The initial graphite crystal is a cabbage-like microsphere, and then it gradually disintegrates and transforms into layered graphite. In addition, YbB6, Yb3(OH)3n(BO3)(3-n) sol, hydrogen, hydrocarbons, and carbon oxides form simultaneously. Our method provides a general and inexpensive route to obtain carbide-derived graphite crystal.

Key words: Carbide-derived carbon, YbB2C2, HydrolysisMolecular cell, First-principles calculations