Molecule-confined modification of graphitic C3N4 to design mesopore-dominated Fe-N-C hybrid electrocatalyst for oxygen reduction reaction

作者全名："Li, Zhaoxu; Luo, Xinyi; Luo, Meifang; Qin, Yuan; Guo, Chaozhong; Liu, Yao; Luo, Zhongli"

作者地址："[Li, Zhaoxu; Qin, Yuan; Guo, Chaozhong; Liu, Yao] Chongqing Univ Arts & Sci, Chongqing Key Lab Mat Surface & Interface Sci, Sch Mat Sci & Engn, Chongqing 02160, Peoples R China; [Li, Zhaoxu; Luo, Xinyi; Luo, Zhongli] Chongqing Med Univ, Coll Basic Med Sci, Chongqing 400044, Peoples R China; [Luo, Meifang] Wuhan Inst Technol, Sch Resources & Civil Engn, Wuhan 430070, Hubei, Peoples R China"

通信作者："Guo, CZ; Liu, Y (corresponding author), Chongqing Univ Arts & Sci, Chongqing Key Lab Mat Surface & Interface Sci, Sch Mat Sci & Engn, Chongqing 02160, Peoples R China.; Luo, ZL (corresponding author), Chongqing Med Univ, Coll Basic Med Sci, Chongqing 400044, Peoples R China."

来源：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

ESI学科分类：ENGINEERING

WOS号：WOS:000685345000012

JCR分区：Q1

影响因子：7.2

年份：2021

卷号：46

期号：59

开始页：30355

结束页：30365

文献类型：Article

关键词：Primary Zn-Air battery; Surface confinement; Mesopore-dominated structure; ORR electrocatalysis; Hemin

摘要："To design inexpensive carbon catalysts and enhance their oxygen reduction reaction (ORR) activity is critical for developing efficient energy-conversion systems. In this work, a novel Fe-N-C hybrid electrocatalyst with carbon nanolayers-encapsulated Fe3O4 nanoparticles is synthesized successfully by utilizing the molecular-level confinement of graphitic C3N4 structures via hemin biomaterial. Benefiting from the Fe-N structure prevalent on the carbon nanosheets and large mesopore-dominated specific surface area, the synthesized catalyst under optimized conditions shows excellent electrocatalytic performance for ORR with an E-ORR at 1.08 V versus reversible hydrogen electrode (RHE) and an E-1/2 at 0.87 V vs. RHE, and outstanding long-term stability, which is superior to commercial Pt/C catalysts (E-ORR at 1.04 V versus RHE and E-1/2 at 0.84 V versus RHE). Moreover, the low hydrogen peroxide yield (<11%) and average electron transfer number (similar to 3.8) indicate a four-electron ORR pathway. Besides, the maximum power density of the home-made Zn-air battery using the obtained catalyst is 97.6 mW cm(-2). This work provides a practical route for the synthesis of cheap and efficient ORR electrocatalysts in metal-air battery systems. (C) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved."

基金机构："National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [21805024, 31771101]; Basic Research and Frontier Exploration Project of Chongqing Municipality [cstc2018jcyjAX0461, cstc2015jcyjBX0072]; Scientific and Technological Research Program of Chongqing Municipal Education Commission [KJQN201901335]"

基金资助正文："This work was financially supported by the National Natural Science Foundation of China (Project No: 21805024, 31771101) , the Basic Research and Frontier Exploration Project of Chongqing Municipality (Project No: cstc2018jcyjAX0461, cstc2015jcyjBX0072) , and the Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJQN201901335) ."