Citation: LIU Shu-Hui, LEI Jie, WU Yuan, JIN Xiao-Yong, PENG Juan, NI Gang. Construction of Phenol/Oxygen Fuel Cell Based on Cobaltosic Oxide-Multi-Walled Carbon Nanotubes Nanocomposite-modified Electrode as Anode[J]. Chinese Journal of Analytical Chemistry, ;2019, 47(8): 1195-1204. doi: 10.19756/j.issn.0253-3820.181714 shu

Construction of Phenol/Oxygen Fuel Cell Based on Cobaltosic Oxide-Multi-Walled Carbon Nanotubes Nanocomposite-modified Electrode as Anode

State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan 750021, China

Received Date: 12 November 2018
Revised Date: 27 May 2019

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21765017, 21765016, 21567021), the National First-rate Discipline Construction Project of Ningxia, China (No. NXYLXK2017A04) and the Major Innovation Projects for Building First-class Universities in China's Western Region (No. ZKZD2017003).

Cobaltosic oxide (Co₃O₄) nanoparticles were synthesized by solvothermal method, which were applied to prepare Co₃O₄-MWCNTs nanocomposites multi-walled carbon nanotubes (MWCNTs) by ultrasonic assisted method. Then, glassy carbon electrode (GCE) was modified with the nanocomposites (Co₃O₄-MWCNTs/GCE) as anode for the preparation of phenol/O₂ fuel cell. The morphology of the prepared materials was characterized by scanning electron microscopy, transmission electron microscopy and X-ray powder diffraction. In addition, the cyclic voltammetric response characteristics of phenol on different electrodes (GCE, MWCNTs/GCE, Co₃O₄/GCE and Co₃O₄-MWCNTs/GCE) were investigated. The electrochemical response signals at different scan rates (20-120 mV/s) and different concentrations (60-300 mg/L) of phenol on Co₃O₄-MWCNTs modified electrodes were also investigated. The results of electrochemical test showed that Co₃O₄-MWCNTs nanocomposites had better electrocatalytic performance for the oxidization of phenol than that of simplex Co₃O₄ or MWCNTs. The platinum film was electrodeposited by cyclic voltammetry as a cathode oxygen reduction catalyst, and a platinum film-modified glassy carbon electrode (Pt/GCE) was obtained after 30 CV deposition cycles. A phenol/O₂ biofuel cell was thus constructed with Co₃O₄-MWCNTs/GCE as anode and Pt/GCE as cathode. The open circuit potential (OCP) of the fuel cell was 0.44 V and the maximal power density (Pmax) measured at 0.35 V was 0.27 mW/cm² when the phenol concentration was 500 mg/L, exhibiting good application potential.
- Cobaltosic oxide,
- Multi-walled carbon nanotubes,
- Nanocomposite,
- Phenol,
- Fuel cells
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