期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 613, 期 -, 页码 733-746出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.12.191
关键词
Mechanical grinding; Carbon nanotube assembly; Co nanoparticles; Bifunctional electrocatalyst; Nitrogen-doped graphene
资金
- National Natural Science Foundation of China [U1703251, U1810113]
- Shaanxi Provincial Innovation Capability Support Program [2019TD-021]
- Shaanxi Natural Science Foundation-Shaanxi Coal Joint Fund Cultivation Project [2019JLP-12]
- Key Research and Development Plan of Shaanxi Province [2017ZDCXL-GY-10-01-02]
This study presents a facile operation protocol for preparing efficient and durable catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). The constructed three-dimensional carbon nanotube assembly exhibits excellent performance and durability.
The exploration and preparation of inexpensive, high-performance and stable catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of significant imperativeness, yet is still on the way. In this study, a facile operation protocol is presented for constructing an exquisite threedimensional coral reef-like carbon nanotube assembly bridged with N-doped graphene (assigned as 3D CNTAs-NG, which represented carbonization products at 900 degrees C) as highly efficient and durable ORR/ OER electrocatalysts. It does not require the introduction of reductive atmosphere. In this tactic, the dicyanamide ligand on the Co-MOF not only was instrumental in the introduction of nitrogen but also acted as the inducer of carbon nanotubes (CNTs) to lock the metallic Co in graphitic carbon layers. Graphene oxide (GO) is chosen as a matrix to pin the CNTs and ensure the uniform distribution of CNTs. The obtained CNTAs-NG structure possesses 3D open porous texture, abundant defects, desired nitrogen bonding type and high specific surface area, providing them with excellent ORR and OER properties. As such, the optimized 3D CNTAs-NG sample shows high onset potential (E-onset = 0.97 V vs. RHE) and half-wave potential (E-1/2 = 0.85 V vs. RHE) for ORR and overpotential of 340 mV at 10 mA.cm(-2) for OER. Meanwhile, the prepared optimum catalyst exhibited outstanding durability for ORR and OER in alkaline solutions. This work may pave significant concepts for the synthesis of highly active bifunctional electrocatalysts with intriguing architectures and compositions. (C) 2022 Elsevier Inc. All rights reserved.
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