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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 enhanced 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 poor durability. Here, we report OER catalysts of NiFe nanoparticles encapsulated by nitrogen–doped graphitized carbon shells derived from bimetallic metal–organic frameworks (MOFs) precursors. The optimal OER catalyst shows excellent activity (360 mV overpotential at 10 mA cm–2GEO) and durability (no obvious degradation after 20 000 cycles). The electron-donation from Fe and tuned electronic structure of metal cores by Ni are revealed to be primary contributors to the enhanced OER activity. We further demonstrated that the structure and morphology of encapsulating carbon shells, which are the key factors influencing the durability, are facilely controlled by chemical state of precursors. Severe metal particle growth probably caused by oxidation of carbon shells and encapsulated nanoparticles is believed to the main mechanism for activity degradation in these catalysts.

Authors:
; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Fuel Cell Technologies (FCTO); USDOE Office of Science - Office of Biological and Environmental Research; National Natural Science Foundation of China (NNSFC); China Scholarship Council
OSTI Identifier:
1393456
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nano Energy; Journal Volume: 39; Journal Issue: C
Country of Publication:
United States
Language:
English
Subject:
electrocatalysis; encapsulated nanoparticles; graphitized carbon shell; metal-organic frameworks; oxygen evolution reaction

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_1393456,
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 enhanced 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 poor durability. Here, we report OER catalysts of NiFe nanoparticles encapsulated by nitrogen–doped graphitized carbon shells derived from bimetallic metal–organic frameworks (MOFs) precursors. The optimal OER catalyst shows excellent activity (360 mV overpotential at 10 mA cm–2GEO) and durability (no obvious degradation after 20 000 cycles). The electron-donation from Fe and tuned electronic structure of metal cores by Ni are revealed to be primary contributors to the enhanced OER activity. We further demonstrated that the structure and morphology of encapsulating carbon shells, which are the key factors influencing the durability, are facilely controlled by chemical state of precursors. Severe metal particle growth probably caused by oxidation of carbon shells and encapsulated nanoparticles is believed to the main mechanism for activity degradation in these catalysts.},
doi = {10.1016/j.nanoen.2017.07.006},
journal = {Nano Energy},
number = C,
volume = 39,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 2017},
month = {Fri Sep 01 00:00:00 EDT 2017}
}