钴盐阴离子基团对Co-N-C催化剂电催化活性的影响

doi:10.11896/j.issn.1005-023X.2018.03.003

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Abstract

During the process of the aniline polymerization, bivalent cobalt salt with different anionic groups such as (C₂H₃O₂)₂^2-, Cl₂^2-, (NO₃)₂^2-, SO₄^2- and C₂O₄^2- were added into the solution and then different polyaniline cobalt (PANI-Co) coordination polymer were obtained. Finally, Co-N-C catalysts were prepared through pyrolysis of PANI-Co coordination polymer. The morphology, structure, chemical composition and chemical valence of the Co-N-C catalysts were characterized by scanning electron microscopy (SEM), X-ray spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectra (Raman). The electrocatalytic activity of Co-N-C catalysts were tested by electrochemical method. The results showed that the cobalt salt anionic groups had little impact on the morphology of Co-N-C catalysts, but had a great influence on the composition and surface chemistry of Co-N-C catalysts, carbon structure, degree of graphitization and the valence of Co. The cobalt salt anionic groups could affect the electrocatalytic activity of Co-N-C catalysts. The catalytic activities decreased as (C₂H₃O₂)₂^2-＞Cl₂^2-＞(NO₃)₂^2-＞SO₄^2-＞C₂O₄^2-. The Co-N-C catalysts prepared by cobalt salt containing (C₂H₃O₂)₂^2- and Cl₂^2- anions had higher ORR activity, which possibly due to the higher content of graphite nitrogen and pyridine nitrogen.

Key words： Co-N-C catalyst polyaniline cobalt salt anionic groups electrocatalytic activity

Published: 10 February 2018

CLC number:	O643.36
	TM911.48

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	Articles by authors
	Yimeng XIA
	Shuai WU
	Feng TAN
	Wei LI
	Qingmao WEI
	Chungang MIN
	Xikun YANG

Cite this article:

Yimeng XIA,Shuai WU,Feng TAN, et al. Effect of Anionic Groups of Cobalt Salt on the Electrocatalytic Activity of Co-N-C Catalysts[J]. Materials Reports, 2018, 32(3): 362-367.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.03.003 OR http://www.mater-rep.com/EN/Y2018/V32/I3/362

XRD patterns of different Co-N-C catalysts

The SEM images of different Co-N-C catalysts:(a)Co-N-C/C₄H₆CoO₄,(b)Co-N-C/CoCl₂,(c)Co-N-C/CoSO₄,(d)Co-N-C/Co(NO₃)₂,(e)Co-N-C/CoC₂O₄

XPS results of the surface element analysis of Co-N-C

The XPS spectra of N 1s region for different Co-N-C catalysts

The XPS spectra of Co 2p region for different Co-N-C catalysts

Raman spectra of different Co-N-C catalysts

CV curves of different Co-N-C catalysts

LSV curves of different Co-N-C catalysts

The different Co-N-C catalysts in O₂-saturated 0.5 mol/L H₂SO₄ solution at 1 500 r/min

The n value of ORR of different Co-N-C catalysts at 0.25 V electrode potential

LSV curves at different rotation speed and the corresponding K-L plots for Co-N-C/C₄H₆CoO₄in O₂-saturated 0.5 mol/L H₂SO₄

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