Atomically Dispersed Bimetallic FeNi Catalysts as Highly Efficient Bifunctional Catalysts for Reversible Oxygen Evolution and Oxygen Reduction Reactions
Atomically Dispersed Bimetallic FeNi Catalysts as Highly Efficient Bifunctional Catalysts for Reversible Oxygen Evolution and Oxygen Reduction Reactions
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DOI：
10.1002/celc.201900483
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发表时间：
2019-07-01
期刊：
影响因子：
4
通讯作者：
Jiang, San Ping
中科院分区：
文献类型：
--
作者：
Cheng, Yi;He, Shuai;Jiang, San Ping
采用改进的一锅合成方法，制备了负载2-7 wt %不同Fe: Ni比的n掺杂碳纳米管上的双金属原子分散FeNi催化剂，作为金属空气电池可逆氧还原反应（ORR）和析氧反应（OER）的高活性、稳定的双功能催化剂。与原子分散的单一Fe和Ni催化剂相比，双金属FeNi催化剂在可逆OER和ORR方面表现出出色的性能，实现了0.81 V的低电位隙（δ E）， OER电流密度为10 mA cm(-2)， ORR电流密度为3 mA cm（-2）。与最先进的Pt/C和Pt/C+Ir/C电极相比，FeNi电极在可逆OER和ORR方面也表现出更好的稳定性。这种高性能可能是由于Ni原子的引入显著增强了OER活性，形成了OER的桥接FeNi双金属双原子活性位点。本研究为开发高活性双金属原子催化剂为基础的金属-空气电池双功能电催化剂提供了新的平台。本研究证明的改进的一锅合成方法也适用于其他碳纳米管或石墨烯上的原子分散催化剂。
Bimetallic atomically dispersed FeNi catalysts anchored on N-doped carbon nanotube with catalyst loading of 2-7 wt % with different Fe : Ni ratio have been developed as highly active and stable bifunctional catalyst for reversible oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) for metal air batteries via a modified one-pot synthesis method. Compared with atomically dispersed single Fe and Ni catalysts, the bimetallic FeNi catalysts exhibit outstanding performance for reversible OER and ORR, achieving a low potential gap (Delta E) of 0.81 V to deliver an OER current density of 10 mA cm(-2) and an ORR current density of 3 mA cm(-2). The FeNi electrodes also show a much better stability in the cyclic tests, compared to that of the state-of-the-art Pt/C and Pt/C+Ir/C electrodes for reversible OER and ORR. The high performance is likely due to the significantly enhanced OER activity contributed by the introduction of Ni atoms, forming bridged FeNi bimetallic dual atom active sites for OER. This study provides a new platform for the development of highly active bimetallic atomic catalysts based bifunctional electrocatalysts for metal-air batteries. The modified one-pot synthesis methods demonstrated in this study can also be applicable to other atomically dispersed catalysts on CNTs or graphenes.