It is of great significance to explore efficient and low-cost bifunctional electrocatalysts for oxygen reduction (ORR) and oxygen evolution (OER) reactions.Co/Co9S8 nanoparticles were anchored to N and S double-doped 3D carbon matrix (NSG/CNTs) by combination of one-pot hydrothermal method and pyrolysis.The results shown that the doped carbon matrix not only played important role in the electrochemical performance of the original metal compound,but also inhibited the aggregation of the original metal compound in the formation process.The electrochemical tests showed that Co/Co9S8@NSG/CNTs not only showed good ORR performance with a half-wave potential of 81.4mV,which was comparable to the commercial Pt/C catalyst (20wt%),but also showed excellent stability.The prepared catalyst also showed good electrocatalytic activity of OER,which was similar to that of commercial RuO2.Therefore,Co/Co9S8@NSG/CNTs was good bifunctional catalyst,and had wide application prospect in the field of metal-air batteries.
[1] Chen W,Li T,Hu Q,et al.Hierarchical CoS2@C hollow microspheres constructed by nanosheets with superior lithium storage[J].Journal of Power Sources,2015,286:159-165.
[2] Fang W,Bai Z,Yu X,et al.Pollen-derived porous carbon decorated with cobalt/iron sulfide hybrids as cathode catalysts for flexible all-solid-state rechargeable Zn-air batteries[J].Nanoscale,2020,12(21):11746-11758.
[3] Fang W,Dai P,Hu H,et al.Fe0.96S/Co8FeS8 nanoparticles co-embedded in porous N,S codoped carbon with enhanced bifunctional electrocatalystic activities for all-solid-state Zn-air batteries[J].Applied Surface Science,2020,505:144212.
[4] Fang W,Hu H,Jiang T,et al.N- and S-doped porous carbon decorated with in-situ synthesized Co-Ni bimetallic sulfides particles:a cathode catalyst of rechargeable Zn-air batteries[J].Carbon,2019,146:476-485.
[5] Li L,Song L,Guo H,et al.N-doped porous carbon nanosheets decorated with graphitized carbon layer encapsulated Co9S8 nanoparticles:an efficient bifunctional electrocatalyst for the OER and ORR[J].Nanoscale,2019,11(3):901-907.
[6] Chen B,Li R,Ma G,et al.Cobalt sulfide/N,S codoped porous carbon core-shell nanocomposites as superior bifunctional electrocatalysts for oxygen reduction and evolution reactions[J].Nanoscale,2015,7(48):20674-20684.
[7] Ma X X,Dai X H,He X Q.Co9S8-modified N,S,and P ternary-doped 3D graphene aerogels as a high-performance electrocatalyst for both the oxygen reduction reaction and oxygen evolution reaction[J].ACS Sustainable Chemistry & Engineering,2017,5(11):9848-9857.
[8] Zhang P,Bin D,Wei J S,et al.Efficient oxygen electrocatalyst for Zn-air batteries:carbon dots and Co9S8 nanoparticles in a N,S-codoped carbon matrix[J].ACS Applied Materials & Interfaces,2019,11(15):14085-14094.
[9] Wang N,Li L,Zhao D,et al.Graphene composites with cobalt sulfide:efficient trifunctional electrocatalysts for oxygen reversible catalysis and hydrogen production in the same electrolyte[J].Small,2017,13(33):1701025.
[10] Zhang H,Niu F,Li S,et al.Thin metal organic layer derived Co/Co9S8/N,S co-doped carbon nanosheets synthesized by the space confinement effect of montmorillonite for oxygen electrocatalysis[J].New Journal of Chemistry,2020,44(22):9522-9529.
[11] Sun X,Gong Q,Liang Y,et al.Exploiting a high-performance “double-carbon” structure Co9S8/GN bifunctional catalysts for rechargeable Zn-air batteries[J].ACS Applied Materials & Interfaces,2020,12(34):38202-38210.
[12] Tian W W,Ren J T,Lv X W,et al.In situ sulfidation for controllable heterointerface of cobalt oxides-cobalt sulfides on 3D porous carbon realizing efficient rechargeable liquid-/solid-state Zn-air batteries[J].ACS Sustainable Chemistry & Engineering,2020,9(1):510-520.
[13] Wang J,Liu H,Liu Y,et al.Sulfur bridges between Co9S8 nanoparticles and carbon nanotubes enabling robust oxygen electrocatalysis[J].Carbon,2019,144:259-268.
[14] Wang T,Wu L,Xu X,et al.An efficient Co3S4/CoP hybrid catalyst for electrocatalytic hydrogen evolution[J].Scientific Reports,2017,7(1):1-9.
[15] He K,Xie J,Li M,et al.In situ one-pot fabrication of g-C3N4 nanosheets/NiS cocatalyst heterojunction with intimate interfaces for efficient visible light photocatalytic H2 generation[J].Applied Surface Science,2018,430:208-217.
[16] Li C,Guo Y,Yang F,et al.One-pot-solid preparation of novel three-dimensional FexS1-x/g-C3N4 heterostructures for efficient photocatalytic mixed-pollutants removal[J].Ceramics International,2020,46(14):22683-22691.
[17] Li Z,Ma Y,Hu X,et al.Enhanced photocatalytic H2 production over dual-cocatalyst-modified g-C3N4 heterojunctions[J].Chinese Journal of Catalysis,2019,40(3):434-445.
[18] Lin X,Du S,Li C,et al.Consciously constructing the robust NiS/g-C3N4 hybrids for enhanced photocatalytic hydrogen evolution[J].Catalysis Letters,2020,150(7):1898-1908.
[19] Liu L,Xu X,Si Z,et al.Noble metal-free NiS/P-S codoped g-C3N4 photocatalysts with strong visible light absorbance and enhanced H2 evolution activity[J].Catalysis Communications,2018,106:55-59.
[20] Lu L,Xu X,An K,et al.Coordination polymer derived NiS@g-C3N4 composite photocatalyst for sulfur vacancy and photothermal effect synergistic enhanced H2 production[J].ACS Sustainable Chemistry & Engineering,2018,6(9):11869-11876.
基金资助
国家自然科学基金青年基金(21706019);山西省自然科学基金青年基金项目(201901D211226);山西省高等学校科技创新项目(2019L0525);山西省留学基金委资助科研项目(2021-120)
PDF
