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CoNi nanoparticles anchored inside carbon nanotube networks by transient heating:Low loading and high activity for oxygen reduction and evolution

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Journal of Energy Chemistry 2021年第3期30卷 63-71页

作者： Chengfeng Zhu Wei Yang Jiangtao Di Sha Zeng Jian Qiao Xiaona Wang Bo Lv Qingwen Li Key Laboratory of Multifunctional nanomaterials and Smart Systems Advanced Materials Division.Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123JiangsuChina School of nano-Tech and nano-Bionics University of Science and Technology of ChinaHefei 230026AnhuiChina Division of nanomaterials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesNanchang 330200JiangxiChina School of Materials Science and Engineering and Key Laboratory of Aerospace Materials and Performance Ministry of EducationBeihang UniversityBeijing 100083China

Transitional metal alloy and compounds have been developed as the low cost and efficient bifunctional electrocatalysts for oxygen reduction reaction(ORR)and oxygen evolution reaction(OER).However,a high mass loading of these catalysts is commonly needed to achieve acceptable catalytic performance,which could cause such problems as battery weight gain,mass transport blocking,and catalyst *** report herein the preparation of fine CoNi nanoparticles(5-6 nm)anchored inside a nitrogendoped defective carbon nanotube network(CoNi@N-DCNT)by a transient Joule heating *** utilized as an electrocatalyst for oxygen reduction and evolution in alkaline media,the CoNi@N-DCNT film catalyst with a very low mass loading of 0.06 mg cm^(-2) showed excellent bifunctional catalytic *** ORR,the onset potential(Eonset)and the half-wave potential(E_(1/2))were 0.92 V versus reversible hydrogen electrode(***)and 0.83 V(***),*** OER,the potential at the current density(J)of 10 mA cm^(-2)(E_(10))was 1.53 V,resulting in an overpotential of 300 mV much lower than that of the commercial RuO_(2) catalyst(320 mV).The potential gap between E_(1/2) and E_(10) was as small as 0.7 *** the low mass loading,the mass activity at E_(10) reached at 123.2 A g^(-1),much larger than that of the RuO_(2) catalyst and literature results of transitional metal-based bifunctional ***,the CoNi@N-DCNT film catalyst showed very good long-term stability during the ORR and OER *** excellent bifunctional catalytic performance could be attributed to the synergistic effect of the bimetal alloy.

关键词： Transient Joule heating method Carbon nanotubes nano alloy Low loading Bifunctional catalyst

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