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Title: Nitrogen–doped graphitized carbon shell encapsulated NiFe nanoparticles: A highly durable oxygen evolution catalyst

Abstract

Oxygen evolution reaction (OER) plays a crucial role in various energy conversion devices such as water electrolyzers and metal–air batteries. Precious metal catalysts such as Ir, Ru and their oxides are usually used for enhancing reaction kinetics but are limited by their scarce resource. The challenges associated with alternative non–precious metal catalysts such as transition metal oxides and (oxy)hydroxides etc. are their low electronic conductivity and durability. Herein, we report a highly active (360 mV overpotential at 10 mA cm–2GEO) and durable (no degradation after 20000 cycles) OER catalyst derived from bimetallic metal–organic frameworks (MOFs) precursors. This catalyst consists of NiFe nanoparticles encapsulated by nitrogen–doped graphitized carbon shells. The electron-donation/deviation from Fe and tuned electronic structure of metal cores by Ni are revealed to be primary contributors to the enhanced OER activity, whereas N concentration contributes negligibly. We further demonstrated that the structure and morphology of encapsulating carbon shells, which are the key factors influencing the durability, are facilely controlled by the chemical state of precursors.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
1393733
Report Number(s):
PNNL-SA-124686
Journal ID: ISSN 2211-2855; 48877; HT0201000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nano Energy; Journal Volume: 39
Country of Publication:
United States
Language:
English
Subject:
Environmental Molecular Sciences Laboratory

Citation Formats

Du, Lei, Luo, Langli, Feng, Zhenxing, Engelhard, Mark, Xie, Xiaohong, Han, Binghong, Sun, Junming, Zhang, Jianghao, Yin, Geping, Wang, Chongmin, Wang, Yong, and Shao, Yuyan. Nitrogen–doped graphitized carbon shell encapsulated NiFe nanoparticles: A highly durable oxygen evolution catalyst. United States: N. p., 2017. Web. doi:10.1016/j.nanoen.2017.07.006.
Du, Lei, Luo, Langli, Feng, Zhenxing, Engelhard, Mark, Xie, Xiaohong, Han, Binghong, Sun, Junming, Zhang, Jianghao, Yin, Geping, Wang, Chongmin, Wang, Yong, & Shao, Yuyan. Nitrogen–doped graphitized carbon shell encapsulated NiFe nanoparticles: A highly durable oxygen evolution catalyst. United States. doi:10.1016/j.nanoen.2017.07.006.
Du, Lei, Luo, Langli, Feng, Zhenxing, Engelhard, Mark, Xie, Xiaohong, Han, Binghong, Sun, Junming, Zhang, Jianghao, Yin, Geping, Wang, Chongmin, Wang, Yong, and Shao, Yuyan. Fri . "Nitrogen–doped graphitized carbon shell encapsulated NiFe nanoparticles: A highly durable oxygen evolution catalyst". United States. doi:10.1016/j.nanoen.2017.07.006.
@article{osti_1393733,
title = {Nitrogen–doped graphitized carbon shell encapsulated NiFe nanoparticles: A highly durable oxygen evolution catalyst},
author = {Du, Lei and Luo, Langli and Feng, Zhenxing and Engelhard, Mark and Xie, Xiaohong and Han, Binghong and Sun, Junming and Zhang, Jianghao and Yin, Geping and Wang, Chongmin and Wang, Yong and Shao, Yuyan},
abstractNote = {Oxygen evolution reaction (OER) plays a crucial role in various energy conversion devices such as water electrolyzers and metal–air batteries. Precious metal catalysts such as Ir, Ru and their oxides are usually used for enhancing reaction kinetics but are limited by their scarce resource. The challenges associated with alternative non–precious metal catalysts such as transition metal oxides and (oxy)hydroxides etc. are their low electronic conductivity and durability. Herein, we report a highly active (360 mV overpotential at 10 mA cm–2GEO) and durable (no degradation after 20000 cycles) OER catalyst derived from bimetallic metal–organic frameworks (MOFs) precursors. This catalyst consists of NiFe nanoparticles encapsulated by nitrogen–doped graphitized carbon shells. The electron-donation/deviation from Fe and tuned electronic structure of metal cores by Ni are revealed to be primary contributors to the enhanced OER activity, whereas N concentration contributes negligibly. We further demonstrated that the structure and morphology of encapsulating carbon shells, which are the key factors influencing the durability, are facilely controlled by the chemical state of precursors.},
doi = {10.1016/j.nanoen.2017.07.006},
journal = {Nano Energy},
number = ,
volume = 39,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}