ZIF-Co3O4@ZIF-Derived Urchin-Like Hierarchically Porous Carbon as Efficient Bifunctional Oxygen Electrocatalysts

IF 2.5 4区 化学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Lingling Zhang, Xia Wang, Chong Gong, Weiyan Sun, Zihan Lu
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Abstract

Co3O4 nanoparticles were sandwiched into interlayers between ZIF-8 and ZIF-67 to form ZIF-Co3O4@ZIF precursors. Pyrolysis of ZIF-Co3O4@ZIF yielded an urchin-like hierarchically porous carbon (Co@CNT/NC), the thorns of which were carbon nanotubes embedded Co nanoparticles. With large specific surface area and hierarchically porous structure, as-prepared Co@CNT/NC exhibited excellent bifunctional oxygen electrocatalytic performances. It has good ORR performance with E1/2 of 0.85 V, which exceeds the Pt/C half-wave potential (E1/2=0.83 V). In addition, Co@CNT/NC has an OER performance close to that of RuO2. To further demonstrate the effect of Co modifying on the properties, the samples were subjected to acid washing treatment. Co-based nanoparticles were proved to After acid washing, there was obvious loss of Co particles in Co@CNT/NC, resulting in poor oxygen electrocatalysis. So, the pyrolysis products of ZIF-8-Co3O4@ZIF-67 retained large specific surface area and porous structure can be retained, and on the other hand, the carbon tube structure and original polyhedron framework. Besides, existence of Co nanoparticle@carbon nanotube provided more active sites and improved the ORR and OER performances.

Abstract Image

Abstract Image

ZIF-Co3O4@ZIF 衍生的海胆状分层多孔碳作为高效双功能氧电催化剂。
Co3O4 纳米粒子被夹在 ZIF-8 和 ZIF-67 之间的夹层中,形成 ZIF-Co3O4@ZIF 前体。热解 ZIF-Co3O4@ZIF 得到了海胆状分层多孔碳(Co@CNT/NC),其刺是嵌入 Co 纳米粒子的碳纳米管。制备的 Co@CNT/NC 具有较大的比表面积和分层多孔结构,表现出优异的双功能氧电催化性能。它具有良好的 ORR 性能,E1/2 为 0.85 V,超过了 Pt/C 半波电位(E1/2=0.83 V)。此外,Co@CNT/NC 的 OER 性能接近 RuO2。为了进一步证明 Co 修饰对性能的影响,对样品进行了酸洗处理。结果表明,酸洗后,Co@CNT/NC 中的 Co 颗粒明显减少,导致氧电催化性能变差。因此,ZIF-8-Co3O4@ZIF-67 的热解产物一方面保留了较大的比表面积和多孔结构,另一方面保留了碳管结构和原有的多面体框架。此外,Co 纳米粒子@碳纳米管的存在提供了更多的活性位点,提高了 ORR 和 OER 性能。
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来源期刊
ChemistryOpen
ChemistryOpen CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
4.80
自引率
4.30%
发文量
143
审稿时长
1 months
期刊介绍: ChemistryOpen is a multidisciplinary, gold-road open-access, international forum for the publication of outstanding Reviews, Full Papers, and Communications from all areas of chemistry and related fields. It is co-owned by 16 continental European Chemical Societies, who have banded together in the alliance called ChemPubSoc Europe for the purpose of publishing high-quality journals in the field of chemistry and its border disciplines. As some of the governments of the countries represented in ChemPubSoc Europe have strongly recommended that the research conducted with their funding is freely accessible for all readers (Open Access), ChemPubSoc Europe was concerned that no journal for which the ethical standards were monitored by a chemical society was available for such papers. ChemistryOpen fills this gap.
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