Polyaniline nanosheet derived B/N co-doped carbon nanosheets as efficient metal-free catalysts for oxygen reduction reaction

Polyaniline nanosheet derived B/N co-doped carbon nanosheets as efficient metal-free catalysts for oxygen reduction reaction
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聚苯胺纳米片衍生的B/N共掺杂碳纳米片作为氧还原反应的高效无金属催化剂

DOI:
10.1039/c4ta00814f
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发表时间:
2014-05
影响因子:
11.9
通讯作者:
Xinliang Feng
Xinliang Feng
中科院分区:
材料科学2区
文献类型:
--
作者:
Xiaodong Zhuang;Yuezeng Su;Fan Zhang;Xinliang Feng

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成功制备了一种新型的B/N共掺杂多孔碳纳米片,其杂原子掺杂量较高。以氨基功能化氧化石墨烯(GO)为模板,苯胺、3-氨基苯硼酸和间苯二胺氧化聚合,制备了GO基硼酸功能化聚苯胺纳米片(GO-CBP)。高温处理后,得到了石墨烯基B/N共掺杂碳纳米片(G-CBP),其具有典型的二维形貌,厚度约为20 nm。在1000 °C下CO2活化后,所获得的多孔碳纳米片(G-CBP-a)具有约17 nm的厚度和363 m2 g-1的高比表面积。受益于其高表面积、独特的2D片状纳米结构和高杂原子掺杂含量(5.4%B B和5.3%N),G-CBP-a在碱性条件下对氧还原反应表现出优异的电化学性能(0.1 M KOH),具有低半波电位(G-CBP-a为−0.27 V,Pt/C为−0.18 V),主要的四电子转移机制(在−0.45 V时n = 3.78),出色的甲醇耐受性和耐久性(运行20 000 s后电流降低10% ),以及高扩散限制电流密度(JL = −4.5 mA cm−2)。
A novel B/N co-doped porous carbon nanosheet with a high heteroatom doping content has been successfully prepared. Using amino-functionalized graphene oxide (GO) as the template, oxidation polymerization of aniline, 3-aminophenylboronic acid, and m-phenylenediamine generates GO-based polyaniline nanosheets functionalized with boronic acid (GO-CBP). After high-temperature treatment, graphene-based B/N co-doped carbon nanosheets (G-CBP) are obtained, which show a typical 2D morphology with a thickness of ∼20 nm. After CO2 activation at 1000 °C, the obtained porous carbon nanosheets (G-CBP-a) have a thickness of ∼17 nm and a high specific surface area of 363 m2 g−1. Benefiting from its high surface area, unique 2D sheet nanostructure, and high heteroatom-doping contents (5.4% B and 5.3% N), G-CBP-a exhibits excellent electrochemical performance for the oxygen reduction reaction under alkaline conditions (0.1 M KOH), with a low half-wave potential (−0.27 V for G-CBP-a versus −0.18 V for Pt/C), a dominant four-electron transfer mechanism (n = 3.78 at −0.45 V), and excellent methanol tolerance and durability (10% current decrease after 20 000 s operation), as well as a high diffusion-limiting current density (JL = −4.5 mA cm−2).
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