Co/Co9S8 nanoparticles coupled with N,S-doped graphene-based mixed-dimensional heterostructures as bifunctional electrocatalysts for the overall oxygen electrode

被引:16
作者
Wang, Zhi-Da [1 ]
Bai, Cheng-Kun [2 ]
Chen, Xin-Yu [3 ]
Wang, Bing-Di [1 ]
Lu, Guo-Long [1 ]
Sun, Hang [1 ]
Liu, Zhen-Ning [1 ]
Huang, Hui [2 ]
Liang, Song [1 ]
Zang, Hong-Ying [3 ]
机构
[1] Jilin Univ, Coll Biol & Agr Engn, Minist Educ, Key Lab Bion Engn, Changchun 130022, Jilin, Peoples R China
[2] Jilin Univ, Coll Food Sci & Engn, Changchun 130062, Jilin, Peoples R China
[3] Northeast Normal Univ, Minist Educ, Fac Chem, Key Lab Polyoxometalate Sci, Changchun 130024, Jilin, Peoples R China
基金
中国国家自然科学基金;
关键词
METAL-ORGANIC FRAMEWORKS; CO-DOPED GRAPHENE; EFFICIENT ELECTROCATALYST; REDUCTION REACTION; SOLID-STATE; EVOLUTION; CARBON; MICROSPHERES; PERFORMANCE; NANOSHEETS;
D O I
10.1039/c9qi00796b
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The design and preparation of highly efficient and durable electrocatalysts for the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) is essential due to their applications in many green energy conversion devices, such as fuel cells and rechargeable metal-air batteries. Herein, we report a Co/Co9S8 composite catalyst, which is coupled with reduced graphene oxide (rGO) and multi-walled carbon nanotubes (MWCNTs) via a combined hydrothermal reaction with a calcination method. Benefiting from the unique porous scaffold structures and synergistic interactions between rGO/MWCNT and Co/Co9S8, the electrocatalyst (Co/Co9S8/rGO/MWCNT-800) exhibits high electrochemical activity for the ORR, showing a four-electron oxygen reduction pathway with an onset potential of 0.946 V (vs. RHE) in alkaline medium. Meanwhile, the electrocatalyst shows high electrochemical stability, excellent selectivity and methanol tolerance over the commercial Pt/C. It also exhibits good overall oxygen electrode activity (Delta E = E-OER,E- 10-E-ORR,E- 1/2 of 890 mV). The present work highlights a potential general strategy for developing carbon-based transition metal sulfide nanocomposites as cathodes with better performance in the ORR/OER.
引用
收藏
页码:2558 / 2565
页数:8
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