Citation: Yingbin Huang, Min Zhang, Peng Liu, Faliang Cheng, Lishi Wang. Co₃O₄ supported on N, P-doped carbon as a bifunctional electrocatalyst for oxygen reduction and evolution reactions[J]. Chinese Journal of Catalysis, ;2016, 37(8): 1249-1256. doi: 10.1016/S1872-2067(16)62462-2 shu

Co₃O₄ supported on N, P-doped carbon as a bifunctional electrocatalyst for oxygen reduction and evolution reactions

a. Guangdong Engineering and Technology Research Center for Advanced Nanomaterials, Dongguan University of Technology, Dongguan 523808, Guangdong, China;
b. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China

Received Date: 21 January 2016
Revised Date: 3 May 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21375016, 20475022 and 21505019).

Noble metals, such as platinum, ruthenium and iridium-group metals, are often used as oxygen reduction or evolution reaction (ORR/OER) electrocatalysts. To reduce the cost and provide an application of bifunctional catalysis, in this work, cobalt oxide supported on nitrogen and phosphorus co-doped carbon (Co₃O₄/NPC) was fabricated and examined as a bifunctional electrocatalyst for OER and ORR. To prepare Co₃O₄/NPC, NPC was pyrolyzed from melamine and phytic acid supported on carbon, followed by the solvothermal synthesis of Co₃O₄ on NPC. Linear sweep voltammetry was used to evaluate the activity for OER and ORR. For OER, Co₃O₄/NPC showed an onset potential of 0.54 V (versus the saturated calomel electrode) and a current density of 21.95 mA/cm² at 0.80 V, which was better than both Co₃O₄/C and NPC. The high activity of Co₃O₄/NPC was attributed to a synergistic effect of the N, P co-dopants and Co₃O₄. For ORR, Co₃O₄/NPC exhibited an activity close to commercial Pt/C in terms of the diffusion limited current density (-4.49 vs -4.76 mA/cm² at -0.80 V), and Co₃O₄ played the key role for the catalysis. Chronoamperometry (current versus time) was used to evaluate the stability, which showed that Co₃O₄/NPC maintained 46% current after the chronoamperometry test for OER and 95% current for ORR. Overall, Co₃O₄/NPC exhibited high activity and improved stability for both OER and ORR.
- Cathode catalyst,
- Oxygen reduction reaction,
- Oxygen evolution reaction,
- Doped carbon,
- Cobalt
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Co₃O₄ supported on N, P-doped carbon as a bifunctional electrocatalyst for oxygen reduction and evolution reactions