2D Nanoporous Fe-N/C Nanosheets as Highly Efficient Non-Platinum Electrocatalysts for Oxygen Reduction Reaction in Zn-Air Battery.
2D Nanoporous Fe-N/C Nanosheets as Highly Efficient Non-Platinum Electrocatalysts for Oxygen Reduction Reaction in Zn-Air Battery.
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DOI：
10.1002/smll.201601887
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发表时间：
2016-11
期刊：
影响因子：
13.3
通讯作者：
Z. Yang;Ling Lin;A. Xu
中科院分区：
文献类型：
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作者：
Z. Yang;Ling Lin;A. Xu
制造可以与铂的效率相当或超过铂的效率的非贵金属氧还原反应（ORR）催化剂是一个持续的挑战。以1，4-二（1H-1，3，7，8-四氮杂环戊二烯并（1）菲-2-基）苯（btcpb）为配体，通过热解制备了一种新型的铁配合物前驱体，制备了一种高活性的非铂自支撑Fe-N/C催化剂。在700 °C下热解的最佳催化剂（Fe-N/C-700）显示出最佳的ORR活性，在0.1 M KOH中相对于可逆氢电极（RHE）的半波电位（E1/2）为840 mV，这比商业Pt/C（E1/2：835 mV vs RHE）更正。此外，Fe-N/C-700催化剂在0.1mHClO4中也表现出高的ORR活性，其起始电位和E1/2与Pt/C催化剂相当。值得注意的是，与Pt/C相比，Fe-N/C-700催化剂显示出上级的耐久性（在8000次循环后，对于E1/2，在0.1mKOH中损失9.8mV，在0.1mHClO4中损失23.6mV）和更好的甲醇耐受性。此外，Fe-N/C-700催化剂可用于制备锌-空气电池空气电极，其比容量在5 mA cm-2时为727 mAlg-1，连续运行110 h后电压损失可忽略不计。
It is an ongoing challenge to fabricate nonprecious oxygen reduction reaction (ORR) catalysts that can be comparable to or exceed the efficiency of platinum. A highly active non-platinum self-supporting Fe-N/C catalyst has been developed through the pyrolysis of a new type of precursor of iron coordination complex, in which 1,4-bis(1H-1,3,7,8-tetraazacyclopenta(1)phenanthren-2-yl)benzene (btcpb) functions as a ligand complexing Fe(II) ions. The optimal catalyst pyrolyzed at 700 °C (Fe-N/C-700) shows the best ORR activity with a half-wave potential (E1/2 ) of 840 mV versus reversible hydrogen electrode (RHE) in 0.1 m KOH, which is more positive than that of commercial Pt/C (E1/2 : 835 mV vs RHE). Additionally, the Fe-N/C-700 catalyst also exhibits high ORR activity in 0.1 m HClO4 with the onset potential and E1/2 comparable to those of the Pt/C catalyst. Notably, the Fe-N/C-700 catalyst displays superior durability (9.8 mV loss in 0.1 m KOH and 23.6 mV loss in 0.1 m HClO4 for E1/2 after 8000 cycles) and better tolerance to methanol than Pt/C. Furthermore, the Fe-N/C-700 catalyst can be used for fabricating the air electrode in Zn-air battery with a specific capacity of 727 mA hg-1 at 5 mA cm-2 and a negligible voltage loss after continuous operation for 110 h.