用于高效的氧还原反应MoF衍生的Co-N-C复合材料
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摘要
金属有机框架化合物及其衍生物具有优越的电性能,因为有望替代贵金属而受到广泛的关注。本文通过简单的方法制备Co-N-C复合材料,即在MOFs生长中引入Co2+,然后将其前驱体进行煅烧。Co-N-C复合材料表现出较大的比表面积和高活性点,在0. 1 KOH条件下,电化学分析Co-N-C复合材料半波电位0. 71 V。另外,Co-N-C材料在碱性环境表现出优良的稳定性和抗甲醇中毒。
Metal-organic frameworks( MOFs) and MOF-derived materials have recently attracted considerable interest as alternatives to noble-metal electrocatalysts. Herein,Co-N-C composite with a well-defned morphology is facilely prepared by introducing Co2 +during the growth of MOF,followed by pyrolysis in this paper. The obtained Co-N-C composite with high active sites and large surface area. Electrochemical analysis shows that half-wave potential for ORR on the Co-N-C electrode was 0. 71 V in 0. 1 KOH alkaline medium. In addition,it also has excellent durability and methanol resistance ability in alkaline solutions.
Metal-organic frameworks( MOFs) and MOF-derived materials have recently attracted considerable interest as alternatives to noble-metal electrocatalysts. Herein,Co-N-C composite with a well-defned morphology is facilely prepared by introducing Co2 +during the growth of MOF,followed by pyrolysis in this paper. The obtained Co-N-C composite with high active sites and large surface area. Electrochemical analysis shows that half-wave potential for ORR on the Co-N-C electrode was 0. 71 V in 0. 1 KOH alkaline medium. In addition,it also has excellent durability and methanol resistance ability in alkaline solutions.
引文
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[3] Bharti A,Cheruvally G. Influence of various carbon nano-forms as supports for Pt catalyst on proton exchange membrane fuel cell performance[J]. Journal of Power Sources,2017,360:196-205.
[4] Debe M K. Electrocatalyst approaches and challenges for automotive fuel cells[J]. Nature,2012,486(7401):43.
[5] Hu C,Dai L. Carbon-Based Metal-Free Catalysts for Electrocatalysis beyond the ORR[J]. Angewandte Chemie International Edition,2016,55(39):11736-11758.
[6] Wu G,Zelenay P. Nanostructured nonprecious metal catalysts for oxygen reduction reaction[J]. Accounts of chemical research,2013,46(8):1878-1889.
[7] Zhu Q L,Xu Q. Metal-organic framework composites[J]. Chemical Society Reviews,2014,43(16):5468-5512.
[8] Zhou M,Wang H L,Guo S,et al. Towards high-efficiency nanoelectrocatalysts for oxygen reduction through engineering advanced carbon nanomaterials[J]. Chemical Society R16,45(5):1273-1307.
[9] You B,Jiang N,Sheng M,et al. High-performance overall water splitting electrocatalysts derived from cobalt-based metal-organic frameworks[J]. Chemistry of Materials,2015,27(22):7636-7642.
[10] Zhou W,Lu J,Zhou K,et al. CoSe2nanoparticles embedded defective carbon nanotubes derived from MOFs as efficient electrocatalyst for hydrogen evolution reaction[J]. Nano Energy,2016,28,143-150.
[11] Tang J,Salunkhe R R,Liu J,et al. Thermal conversion of core-shell metal-organic frameworks:a new method for selectively functionalized nanoporous hybrid carbon[J]. Journal of the American Chemical Society,2015,137(4):1572-1580.
[12] Wu J,Zheng X,Jin C,et al. Ternary doping of phosphorus,nitrogen,and sulfur into porous carbon for enhancing electrocatalytic oxygen reduction[J]. Carbon,2015,92:327-338.
[13] Kim J G,Park M S,Hwang S M,et al. Zr4+Doping in Li4Ti5O12Anode for Lithium-Ion Batteries:Open Li+Diffusion Paths through Structural Imperfection[J]. ChemSusChem,2014,7(5):1451-1457.
[14] Liu J,Zhu D,Guo C,et al. Design Strategies toward Advanced MOF-Derived Electrocatalysts for Energy-Conversion Reactions[J]. Advanced Energy Materials,2017,7(23):1700518.
[15] Li X,Jiang Q,Dou S et al. ZIF-67-derived Co-NC@CoP-NC nanopolyhedra as an efficient bifunctional oxygen electrocatalyst[J]. Journal of Materials Chemistry A,2016,4(41):15836-15840.
[16] Jing H,Song X,Ren,S,et al. ZIF-67 derived nanostructures of Co/CoO and Co@N-doped graphitic carbon as counter electrode for highly efficient dye-sensitized solar cells. Electrochimica Acta,2016,213,252-259.
[17] Ai K,Li Z,Cui X. Scalable preparation of sized-controlled Co-N-C electrocatalyst for efficient oxygen reduction reaction[J]. Journal of Power Sources,2017,368,46-56.
[18] Zhong H,Luo Y,He S. et al. Electrocatalytic Cobalt Nanoparticles Interacting with Nitrogen-Doped Carbon Nanotube in Situ Generated from a Metal-Organic Framework for the Oxygen Reduction Reaction[J]. ACS applied materials&interfaces,2017,9(3):2541-2549.
[19] Zhao R,Xia W,Lin C,et al. A pore-expansion strategy to synthesize hierarchically porous carbon derived from metal-organic framework for enhanced oxygen reduction[J]. Carbon,114,284-290.
[20] Aijaz A,Masa J,Rsler C,et al. Co@Co3O4encapsulated in carbon nanotube-grafted nitrogen-doped carbon polyhedra as an advanced bifunctional oxygen electrode[J]. Angewandte Angewandte Chemie International Edition,2016,55(12):4087-4091.
[21] Yusran Y,Xu D,Fang Q,et al. MOF-derived Co@NC nanocatalyst for catalytic reduction of 4-nitrophenol to 4-aminophenol[J]. Microporous and Mesoporous Materials,2017,241:346-354.