Catalysts for oxygen conversion play an important role in energy storage and conversion technologies such as metal-air batteries.Developing highly active stable,and low-cost catalysts is critical for further implement...Catalysts for oxygen conversion play an important role in energy storage and conversion technologies such as metal-air batteries.Developing highly active stable,and low-cost catalysts is critical for further implementation of the above technologies.Herein,an efficien oxygen electrocatalyst with Co_(2)P nanoparticles(NPs)coupling onto N,P-doped porous carbon nanosheets(Co_(2)P@NPAC)derived from cotton stalk is successfully designed and prepared via activation,hydrothermal treatment,and pyrolysis procedure.The excellent properties of electrical conductivity,mass transfer,and synergistic integration between Co_(2)P and N,P-doped carbon endow Co_(2)P@NPAC composite with superior oxygen reduction reaction/oxygen evolution reaction(ORR/OER)performance.Co_(2)P@NPAC catalyst achieves ORR activity with half-wave potential of 0.85 V and high OER activity with overpotential of 261 mV at 10 mA·cm^(-2).The flexible Zn-air batteries(ZABs)based on Co_(2)P@NPAC catalyst revea outstanding performances with a high open-circuit voltage(1.38 V),a peak power density of(75 mW·cm^(-2)),and a low charge-discharge voltage gap(0.74 V,~200 cycles)The flexible ZABs express the stable discharge-charge voltage gap at various bending states.This work provides interesting inspiration for the ingenious design of efficien carbon electrocatalysts from biomass with potential application of energy storage and conversion devices.展开更多
基金financially supported by Jiangsu Province Key Laboratory of Biomass Energy and Materials(No.JSBEM-S-202101)the Young Top Talent Program of Zhongyuan-Yingcai-Jihua(No.30602674)+1 种基金the Top-Notch Talent Program of Henan Agricultural University(No.30501034)the National Natural Science Foundation of China(Nos.31901272 and No.22279118)。
文摘Catalysts for oxygen conversion play an important role in energy storage and conversion technologies such as metal-air batteries.Developing highly active stable,and low-cost catalysts is critical for further implementation of the above technologies.Herein,an efficien oxygen electrocatalyst with Co_(2)P nanoparticles(NPs)coupling onto N,P-doped porous carbon nanosheets(Co_(2)P@NPAC)derived from cotton stalk is successfully designed and prepared via activation,hydrothermal treatment,and pyrolysis procedure.The excellent properties of electrical conductivity,mass transfer,and synergistic integration between Co_(2)P and N,P-doped carbon endow Co_(2)P@NPAC composite with superior oxygen reduction reaction/oxygen evolution reaction(ORR/OER)performance.Co_(2)P@NPAC catalyst achieves ORR activity with half-wave potential of 0.85 V and high OER activity with overpotential of 261 mV at 10 mA·cm^(-2).The flexible Zn-air batteries(ZABs)based on Co_(2)P@NPAC catalyst revea outstanding performances with a high open-circuit voltage(1.38 V),a peak power density of(75 mW·cm^(-2)),and a low charge-discharge voltage gap(0.74 V,~200 cycles)The flexible ZABs express the stable discharge-charge voltage gap at various bending states.This work provides interesting inspiration for the ingenious design of efficien carbon electrocatalysts from biomass with potential application of energy storage and conversion devices.
