Binary Co-Ni oxide nanoparticle-loaded hierarchical graphitic porous carbon for high-performance supercapacitors

doi:10.1016/j.jmst.2019.08.015

Abstract

Abstract:

Heteroatom doped graphitic porous carbon is highly desirable for electrochemical applications because of its excellent conductivity and high surface area. In this study, highly uniform Co-Ni oxide nanoparticle-loaded B, N-doped hierarchical graphitic porous carbon was prepared through a dual pyrolysis process. Graphene dispersed chitosan hydrogel was first used as a precursor to fabricate the porous carbon (GCS-C) at 700 °C. Co and Ni oxide nanoparticles were further anchored on the porous carbon through chemical reduction and calcined at high temperature. The structure of the porous carbon was optimized by the introduction of graphene to the chitosan hydrogel. The graphitic degree of the porous carbon was significantly improved by the Co and Ni species. The heteroatom B and N were found to be well doped in the composite. These features enable the composite to be an excellent candidate for supercapacitor electrodes. The composite demonstrates a high capacitance (1266.7 F g^-1 at 1 A g^-1) and excellent stability.

Key words: Graphitic carbon, Graphene, Metal oxides, Supercapacitor, Porous carbon

Yin Liu, Cuili Xiang, Hailiang Chu, Shujun Qiu, Jennifer McLeod, Zhe She, Fen Xu, Lixian Sun, Yongjin Zou. Binary Co-Ni oxide nanoparticle-loaded hierarchical graphitic porous carbon for high-performance supercapacitors[J]. J. Mater. Sci. Technol., 2020, 37: 135-142.

Figures/Tables 10

Fig. 1. Schematic of the preparation of GCS-C/Co-Ni-B-O.

Fig. 2. SEM images of (a) GCS-C and (b) GCS-C/Co-Ni-B-O; (c), (d) TEM images of GCS-C/Co-Ni-B-O; (e) HRTEM of GCS-C/Co-Ni-B-O; and (f) SAED of GCS-C/Co-Ni-B-O.

Fig. 3. EDX maps of GCS-C/Co-Ni-B-O.

Fig. 4. FTIR spectrum and XRD patterns of CS-C, CS-C/Co-Ni-B-O, and GCS-C/Co-Ni-B-O.

Fig. 5. Raman spectra of CS-C, CS-C/Co-Ni-B-O, and GCS-C/Co-Ni-B-O.

Fig. 6. (a) N2 adsorption-desorption isotherms and (b) pore distribution of GCS-C/Co-Ni-B-O, CS-C/Co-Ni-B-O, and CS-C.

Fig. 7. (a) XPS of GCS-C/Co-Ni-B-O and high resolution XPS of (b) Co2p, (c) Ni2p, and (f) C1?s.

Fig. 8. (a) CV curves of GCS-C/Co-Ni-B-O, CS-C/Co-Ni-B-O, and CS-C at a scan rate of 5?mV s-1; (b) CV curves of GCS-C/Co-Ni-B-O at different scan rates; (c) GCD curves of GCS-C/Co-Ni-B-O, CS-C/Co-Ni-B-O, and CS-C at a current density of 1 A g-1; (d) GCD curves of GCS-C/Co-Ni-B-O at different current densities.

Fig. 9. (a) CV curves of GCS-C/Co-Ni-B-O and rGO at 5?mV s-1; (b) GCD curves of GCS-C/Co-Ni-B-O//rGO asymmetric cell at different current densities.

Fig. 10. (a) Ragone plots of the GCS-C/Co-Ni-B-O//rGO ASC; (b) Cycling stability of GCS-C/Co-Ni-B-O//rGO ASC at 1 A g-1; (c) Nyquist plots of the GCS-C/Co-Ni-B-O//rGO asymmetric cell before and after the cycles.

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