Experimental study demonstrates enhanced oxygen reduction performance in alkaline and acidic electrolytes, highlighting a scalable design for zinc-air batteries.
The development of cost-effective oxygen reduction reaction (ORR) catalysts is of great importance and urgency for green energy technologies. Herein, the uniform Co nanoparticles encapsulated in two-dimensional (2D) nitrogen-doped graphitic-carbon nanosheets (Co@N–C) were synthesized by a one-step solvent-free, template-free, and scalable green pyrolysis strategy. Originating from the mutually reinforcing effect between Co nanoparticles and N–C active sites in the stable 2D porous conductive nanosheet structure, the optimized Co@N–C-700 obviously accelerates the catalytic performance for the ORR under both alkaline and acidic conditions. Especially, it showed good performance compared to 20wt% Pt/C-JM in terms of higher half-wave potential (E1/2 = 0.86 V), larger current density (JL = 6.1 mA·cm–2), and better stability, as well as stronger resistance to methanol crossover. In addition, the 2D Co@N–C-700 still exhibits superior operation performance to commercial Pt/C in a hybrid Zn–air battery test.
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Chen et al. (2024) studied this question.
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