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The development of low-cost bi-functional electrocatalysts with efficient oxygen evolution reaction （OER） and oxygen reduction reaction （ORR） is crucial in energy conversion and storage technologies. In this study， biomass-derived porous carbon and ZIF-67 are combined as excellent bi-functional electrocatalysts through ball milling and high-temperature pyrolysis. The effect of different pyrolysis time on the catalytic performance is investigated. It is found that the formation of Co-N-C catalyst with pyrolysis time of 3 h produces more defects，and the specific surface area is as high as 1210.01 m2·g-1. The rich microporous and mesoporous structure provides more channels for the transmission of electrolyte. In the ORR performance test，the half-wave potential can reach 0.81 V，second only to 0.85 V of the commercial Pt/C catalyst. The OER performance is 1.73 V at a current density of 10 mA·cm-2，which is better than 1.79 V of the commercial IrO2 catalyst. Further theoretical studies show that the defect-rich Co-N-C catalyst can effectively reduce the reaction barrier，and the synergistic effect of Co and N atoms promotes the ORR reaction.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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