Self-grown layered double hydroxide nanosheets on bimetal-organic frameworks-derived N-doped CoOx carbon polyhedra for flexible all-solid-state rechargeable Zn-air batteries

被引：22

作者：

Hao, Yaxin ^{[1
]}

Kang, Yumao ^{[1
]}

Kang, Huichun ^{[1
]}

Xin, Hongyuan ^{[1
]}

Liu, Fangqing ^{[1
]}

Li, Lifang ^{[1
]}

Wang, Wei ^{[2
]}

Lei, Ziqiang ^{[1
]}

机构：

[1] Northwest Normal Univ, Coll Chem & Chem Engn, Key Lab Ecofunct Polymer Mat, Key Lab Polymer Mat Gansu Prov,Minist Educ, Lanzhou 730070, Peoples R China

[2] Lanzhou Jiaotong Univ, Sch Chem & Biol Engn, Lanzhou 730070, Peoples R China

来源：

JOURNAL OF POWER SOURCES | 2022年 / 524卷

基金：

中国国家自然科学基金;

关键词：

N-doping CoOx carbon polyhedra; NiFe LDH nanosheet; Metal-organic frameworks; Bifunctional catalysts; Zn-air battery; OXYGEN REDUCTION REACTION; BIFUNCTIONAL ELECTROCATALYSTS; EFFICIENT; CATALYSTS; ZIF-67; NANOPARTICLE; NANOCAGES; CLUSTERS;

D O I：

10.1016/j.jpowsour.2022.231076

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The synthesis of non-precious metal electrocatalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is essential for flexible rechargeable metal-air batteries. Herein, a novel LDH@N-CoOx@C bifunctional electrocatalyst was synthesized by a straightforward solution reaction, annealing process, and hydrothermal reaction. The material consisted of two-dimensional (2D) NiFe layered double hydroxide (LDH) nanosheets self-grown on N-doped CoOx carbon polyhedra derived from bimetal-organic frameworks. The outer LDH nanosheets effectively maintained the catalytic activity and long-term stability of the inner N-CoOx@C. The heterostructure formed by the LDH self-growth on N-CoOx@C and the strong electronic interaction between N-CoOx@C and LDH greatly promoted the OER and ORR activities. The LDH@N-CoOx@C exhibited a low overpotential of 273 mV at 10 mA cm(-2) for OER and a half-wave potential (E-1/2) close to the commercial Pt/C catalyst for ORR, demonstrating its excellent bifunctional catalytic performance. In addition, the LDH@N-CoOx@C catalyst showed a higher energy density and extraordinary stability in liquid Zn-air batteries (ZABs) compared with the commercial Pt/C + RuO2 catalyst, having good prospect in flexible all-solid-state ZABs.

引用

页数：11

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