3D Nitrogen-Doped Graphene Encapsulated Metallic Nickel-Iron Alloy Nanoparticles for Efficient Bifunctional Oxygen Electrocatalysis.,Chemistry - A European Journal

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3D Nitrogen-Doped Graphene Encapsulated Metallic Nickel-Iron Alloy Nanoparticles for Efficient Bifunctional Oxygen Electrocatalysis.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-01-05 , DOI: 10.1002/chem.201904722
Zhaoyang Wang ₁ , Xiaobin Liao ₁ , Zifeng Lin ₁ , Fuzhi Huang ₁ , Yalong Jiang ₁ , Kwadwo Asare Owusu ₁ , Lin Xu ₁ , Ziang Liu ₁ , Jiantao Li ₁ , Yan Zhao ₁ , Yi-Bing Cheng _{1,

2} , Liqiang Mai ₁

Affiliation

It is extremely desirable to explore high-efficient, affordable and robust oxygen electrocatalysts toward rechargeable Zn-air batteries (ZABs). A 3D porous nitrogen-doped graphene encapsulated metallic Ni3 Fe alloy nanoparticles aerogel (Ni3 Fe-GA1 ) was constructed through a facile hydrothermal assembly and calcination process. Benefiting from 3D porous configuration with great accessibility, high electrical conductivity, abundant active sites, optimal nitrogen content and strong electronic interactions at the Ni3 Fe/N-doped graphene heterointerface, the obtained aerogel showed outstanding catalytic performance toward the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR). Specifically, it exhibited an overpotential of 239 mV to attain 10 mA cm-2 for OER, simultaneously providing a positive onset potential of 0.93 V within a half-wave potential of 0.8 V for ORR. Accordingly, when employed in the aqueous ZABs, Ni3 Fe-GA1 achieved higher power density and superior reversibility than Pt/C-IrO2 catalyst, making it a potential candidate for rechargeable ZABs.

中文翻译：

用于高效双功能氧电催化的 3D 氮掺杂石墨烯封装的金属镍铁合金纳米粒子。

探索用于可充电锌空气电池 (ZABs) 的高效、经济和耐用的氧电催化剂是非常可取的。通过简便的水热组装和煅烧工艺构建了一种 3D 多孔氮掺杂石墨烯封装的金属 Ni3 Fe 合金纳米粒子气凝胶 (Ni3 Fe-GA1)。得益于 3D 多孔结构，在 Ni3 Fe/N 掺杂的石墨烯异质界面上具有良好的可及性、高导电性、丰富的活性位点、最佳的氮含量和强电子相互作用，所获得的气凝胶对析氧反应 (OER) 表现出优异的催化性能和氧还原反应（ORR）。具体来说，它表现出 239 mV 的过电位来达到 10 mA cm-2 的 OER，同时提供 0 的正起始电位。在 ORR 的 0.8 V 半波电位内为 93 V。因此，当用于水性 ZAB 时，Ni3 Fe-GA1 比 Pt/C-IrO2 催化剂具有更高的功率密度和优异的可逆性，使其成为可充电 ZAB 的潜在候选者。

更新日期：2020-02-19

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