Electrocatalytic Activity of Fe/N/C Catalyst for the Oxygen Reduction Reaction in Alkaline Electrolyte

doi:10.6023/A12070389

Acta Chimica Sinica ›› 2012, Vol. 70 ›› Issue (22): 2342-2346.DOI: 10.6023/A12070389 Previous Articles Next Articles

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碱性介质中Fe/N/C催化剂的氧气还原反应催化性能研究

郑龙珍, 陶堃, 熊乐艳, 叶丹, 韩奎, 纪忆

华东交通大学化学化工系南昌 330013

投稿日期:2012-07-24 发布日期:2012-10-23
通讯作者: 郑龙珍 E-mail:zhenglongzhen@tsinghua.org.cn
基金资助:
项目受国家自然科学基金(Nos. 20965003, 21163007, 21165009, 21210102011)资助.

Electrocatalytic Activity of Fe/N/C Catalyst for the Oxygen Reduction Reaction in Alkaline Electrolyte

Zheng Longzhen, Tao Kun, Xiong Leyan, Ye Dan, Han Kui, Ji Yi

Department of Chemistry, East China Jiao Tong University, Jiang Xi, Nan Chang 330013

Received:2012-07-24 Published:2012-10-23
Supported by:
Project supported by the National Natural Science Foundation of China (Nos. 20965003, 21163007, 21165009, 21210102011).

Fuel cells have been recognized as one of the most promising power sources due to their high efficiency and low emissions. However, the high cost and scarcity of traditional Pt-based catalyst limit their commercialization. More intensive research have been focused on the development of non-noble-metal catalysts in order to replace Pt for catalyzing oxygen reduction reaction (ORR). Recently, it was reported that the Fe/N/C catalyst have high activity toward ORR. Chemical vapor deposition (CVD) is the most common method for the preparation of the Fe/N/C catalyst. However, the cost of CVD method is much higher. Here we report a facile method for the preparation of Fe/N/C catalyst for ORR in alkaline electrolyte. The catalyst is prepared by using graphene oxide as carbon support, and K₃Fe(CN)₆ as both nitrogen and iron sources. The precursors are then treated thermally at 800 ℃ under nitrogen atmosphere. In the process of heat treatment, the functional groups of graphene oxide are decomposed to form active center. Simultaneous doping of N and Fe can be realized by the interaction between graphene oxide and K₃Fe(CN)₆. The non-noble-metal catalyst is further characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). It shows that N and Fe elements are successively doped into the graphene substrate. In the catalyst, N elements exist mainly in the forms of pyridine N, pyrrole N and graphite N. Fe(Ⅱ) and Fe(Ⅲ) are coordinated with pyridine N to form Fe-N_x structure. The electrocatalytic activity of catalyst is evaluated by cyclic voltammetry (CV) and rotating disk electrode (RDE) experiments. The Fe/N/C catalyst shows high electrocatalytic activity toward ORR in an alkaline solution with an onset potential of -0.15 V vs. Ag/AgCl reference electrode. CVs of consecutive sweep for 2000 cycles are conducted to study the stability of the catalyst. The Fe/N/C catalyst exhibits excellent stability and methanol-tolerant ability.

Key words: fuel cells, oxygen reduction reaction, non-noble-metal catalyst, electrocatalysis

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Zheng Longzhen, Tao Kun, Xiong Leyan, Ye Dan, Han Kui, Ji Yi. Electrocatalytic Activity of Fe/N/C Catalyst for the Oxygen Reduction Reaction in Alkaline Electrolyte[J]. Acta Chimica Sinica, 2012, 70(22): 2342-2346.

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碱性介质中Fe/N/C催化剂的氧气还原反应催化性能研究

Electrocatalytic Activity of Fe/N/C Catalyst for the Oxygen Reduction Reaction in Alkaline Electrolyte

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