Edge Defect Engineering of Nitrogen-Doped Carbon for Oxygen Electrocatalysts in Zn-Air Batteries

Wang, Qichen1,3; Lei, Yongpeng2,4; Zhu, Yinggang6; Wang, Hong4,7; Feng, Junzong5; Ma, Guangying4; Wang, Yingde5; Li, Youji8; Nan, Bo6; Feng, Qingguo9,10,11; Lu, Zhouguang6; Yu, Hao1

2018-09-05

10.1021/acsami.8b07863

ACS Applied Materials & Interfaces   影响因子和分区

1944-8244

1944-8252

Metal-free bifunctional oxygen electrocatalysts are extremely critical to the advanced energy conversion devices, such as high energy metal air batteries. Effective tuning of edge defects and electronic density on carbon materials via simple methods is especially attractive. In this work, a facile alkali activation method has been proposed to prepare carbon with large specific surface area and optimized porosity. In addition, subsequent nitrogen-doping leads to high pyridinic-N and graphitic-N contents and abundant edge defects, further enhancing electrochemical activities. Theoretical modeling via first-principles calculations has been conducted to correlate the electrocatalytic fundamental chemical structure of N doping and edge defect engineering. The metal-free product (NKCNPs-900) shows a high half-wave potential of 0.79 V (ORR). Furthermore, the assembled Zn-air batteries display excellent performance among carbon-based metal-free oxygen electrocatalysts, such as large peak power density up to 131.4 mW cm(-2), energy density as high as 889.0 W h kg(-1) at 4.5 mA cm(-2), and remarkable discharge-charge cycles up to 575 times. Preliminarily, the rechargeable nonaqueous Li-air batteries were also investigated. Therefore, our work provides a low-cost, metal-free, and high-performance bifunctional carbon-based electrocatalyst for metal-air batteries.

metal-free nitrogen-doped carbon edge defects bifunctional oxygen electrocatalysts Zn-air batteries

SCI ; EI

英语

通讯

NSFC[11627901]

Science & Technology - Other Topics ; Materials Science

Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary

WOS:000444355700025

AMER CHEMICAL SOC

20183505763323

Calculations ; Carbon ; Doping (additives) ; Electrocatalysts ; Electrolysis ; Energy conversion ; Metals ; Nitrogen ; Oxygen

Energy Conversion Issues:525.5 ; Electrochemistry:801.4.1 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Mathematics:921

Web of Science

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Wang, Qichen,Lei, Yongpeng,Zhu, Yinggang,et al. Edge Defect Engineering of Nitrogen-Doped Carbon for Oxygen Electrocatalysts in Zn-Air Batteries[J]. ACS Applied Materials & Interfaces,2018,10(35):29448-29456.

Wang, Qichen.,Lei, Yongpeng.,Zhu, Yinggang.,Wang, Hong.,Feng, Junzong.,...&Yu, Hao.(2018).Edge Defect Engineering of Nitrogen-Doped Carbon for Oxygen Electrocatalysts in Zn-Air Batteries.ACS Applied Materials & Interfaces,10(35),29448-29456.

Wang, Qichen,et al."Edge Defect Engineering of Nitrogen-Doped Carbon for Oxygen Electrocatalysts in Zn-Air Batteries".ACS Applied Materials & Interfaces 10.35(2018):29448-29456.