Preparation and Properties of Oxygen Electrode Catalyst (Co, N)/C

doi:10.11901/1005.3093.2016.274

Chinese Journal of Materials Research

2017, Vol. 31

Issue (4): 267-273 DOI: 10.11901/1005.3093.2016.274

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Preparation and Properties of Oxygen Electrode Catalyst (Co, N)/C

Huihua WANG^1,², Bin GE¹, Lijuan SU¹, Tianpeng QU¹, Deyong WANG¹, Zhenhui KANG²(

)

1 Shagang School of Iron and Steel, Soochow University, Suzhou 215021,China
2 Institute of Functional Nano and Soft Materials (FUNSOM), Soochow University, Suzhou 215021,China;

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Huihua WANG, Bin GE, Lijuan SU, Tianpeng QU, Deyong WANG, Zhenhui KANG. Preparation and Properties of Oxygen Electrode Catalyst (Co, N)/C. Chinese Journal of Materials Research, 2017, 31(4): 267-273.

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Abstract

Nano-catalyst of (Co, N)/C has been successfully synthesized by solvothermal method using Co(Ac)₂, NH₃H₂O and nano-carbon powder as starting materials. The results show that the oxygen reduction reaction (ORR) activity of (Co, N)/C is better than that of single nitrogen-doped or cobalt-doped nano-carbon powder in terms of the onset potential (-0.08 V) and peak potential (-0.165 V), which is comparable to the commercial catalyst Pt-C. The electron-transferred number of (Co, N)/C for ORR is about 3.59, which is close to the first order reaction kinetics of ORR (n=4). The intermediate product of H₂O₂produced from the ORR takes up about 25%. The (Co, N)/C catalyst also exhibits better methanol durability and stability comparing to the commercial Pt-C (20% Pt). Bonds of N-(C)₂, C-N-C and Co-C are the main active units of the catalyst and Co₃O₄ nano-particles can cooperatively improve the ability of catalyst.

Key words: metal-air batteries (Co,N)/C nano catalyst ORR onset potential doping

Received: 20 May 2016

ZTFLH:

TM911

Fund: Supported by National Natural Science Foundation of China (Nos.51422207, 51604179 & 51674172) and Natural Science Foundation of Jiangsu Province (Nos.BK20140346 & BK20150334)

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	Huihua WANG
	Bin GE
	Lijuan SU
	Tianpeng QU
	Deyong WANG
	Zhenhui KANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.274 OR https://www.cjmr.org/EN/Y2017/V31/I4/267

Fig.1 TEM and HRTEM images of C dots and (Co, N)/C catalyst

Fig.2 CV and LSV analysis of Co and (or) N doped catalysts

Fig.3 Results for the rotating disk electrode (RDE) voltammograms of the (Co, N)/C at various rotation speeds (a) and the Koutecky-Levich plots of J ^-1 vs. ω ^-1/2of the (Co, N)/C at potentials of -0.7 V, -0.8 and -0.9 V (b)

Fig.4 Rotating ring-disk electrode (RRDE) linear sweep voltammogram (LSV) curves for Co/N/C with a rotation rate of 1600 rpm and H₂O₂ yields based on the RRDE data

Fig.5 (a) Cyclic voltammograms of (Co, N)/C catalyst in 0.1 mol/L KOH with or without 0.5 mol/L methanol and (b) current-time (i-t) curves of (Co, N)/C and Pt/C catalysts at -0.4 V in 0.1 mol/L KOH solution for 10 h

Fig.6 XPS and high resoulution analysis of (Co, N)/C catalysts

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