Single‐Atom Fe‐Nx‐C as an Efficient Electrocatalyst for Zinc–Air Batteries,Advanced Functional Materials

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Single‐Atom Fe‐Nx‐C as an Efficient Electrocatalyst for Zinc–Air Batteries
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2019-02-04 , DOI: 10.1002/adfm.201808872
Junxing Han _{1,

2} , Xiaoyi Meng _{1,

2} , Liang Lu ₁ , Juanjuan Bian _{1,

2} , Zhipeng Li ₃ , Chunwen Sun _{1,

2,

4}

Affiliation

Highly efficient non‐noble metal electrocatalysts are vital for metal–air batteries and fuel cells. Herein, a noble‐metal–free single‐atom Fe‐N _x‐C electrocatalyst is synthesized by incorporating Fe‐Phen complexes into the nanocages in situ during the growth of ZIF‐8, followed by pyrolysis at 900 °C under inert atmosphere. Fe‐Phen species provide both Fe²⁺ and the organic ligand (Phen) simultaneously, which play significant roles in preparing single‐atom catalysts. The obtained Fe‐N_x‐C exhibits a half‐wave potential of 0.91 V for the oxygen reduction reaction, higher than that of commercial Pt/C (0.82 V). As a cathode catalyst for primary zinc–air batteries (ZABs), the battery shows excellent electrochemical performances in terms of the high open‐circuit voltage (OCV) of 1.51 V and a high power density of 96.4 mW cm⁻². The rechargeable ZAB with Fe‐N_x‐C catalyst and the alkaline electrolyte shows a remarkable cycling performance for 300 h with an initial round‐trip efficiency of 59.6%. Furthermore, the rechargeable all‐solid‐state ZABs with the Fe‐N_x‐C catalyst show high OCV of 1.49 V, long cycle life for 120 h, and foldability. The single‐atom Fe‐N_x‐C electrocatalyst may function as a promising catalyst for various metal–air batteries and fuel cells.

中文翻译：

单原子Fe-NxC作为锌空气电池的高效电催化剂

高效的非贵金属电催化剂对于金属-空气电池和燃料电池至关重要。在此，通过在ZIF-8的生长过程中将Fe-Phen配合物原位掺入纳米笼中，然后在惰性气氛下于900°C的温度下热解，来合成无贵金属的单原子Fe‐N _x ‐ C电催化剂。Fe-Phen物种同时提供Fe ²⁺和有机配体（Phen），它们在制备单原子催化剂中起着重要作用。获得的Fe‐N _x ‐C的氧还原反应半波电势为0.91 V，高于商用Pt / C的半波电势（0.82 V）。作为一次锌-空气电池（ZAB）的阴极催化剂，该电池在1.51 V的高开路电压（OCV）和96.4 mW cm ^-2的高功率密度方面表现出出色的电化学性能。带有Fe‐N _x ‐ C催化剂和碱性电解质的ZAB可充电电池在300小时内表现出出色的循环性能，初始往返效率为59.6％。此外，带有Fe‐N _x ‐ C催化剂的可充电全固态ZAB的OCV为1.49 V，循环寿命长达120 h，并且具有可折叠性。单原子Fe‐N _x‐C电催化剂可以用作各种金属空气电池和燃料电池的有前途的催化剂。

更新日期：2019-02-04

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