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Cu,N‐Codoped Carbon Nanodisks with Biomimic Stomata‐Like Interconnected Hierarchical Porous Topology as Efficient Electrocatalyst for Oxygen Reduction Reaction
Author(s) -
Wang Tao,
Yang Rui,
Shi Naien,
Yang Jing,
Yan Hongyu,
Wang Junyi,
Ding Zhen,
Huang Wei,
Luo Qing,
Lin Yue,
Gao Jian,
Han Min
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201902410
Subject(s) - electrocatalyst , carbonization , catalysis , materials science , chemical engineering , metal organic framework , electrochemistry , methanol , nanostructure , reversible hydrogen electrode , carbon fibers , nanotechnology , porosity , topology (electrical circuits) , electrode , chemistry , organic chemistry , working electrode , scanning electron microscope , adsorption , composite material , mathematics , combinatorics , composite number , engineering
Metal,N‐codoped carbon (M‐N‐C) nanostructures are promising electrocatalysts toward oxygen reduction reaction (ORR) or other gas‐involved energy electrocatalysis. Further creating pores into M‐N‐C nanostructures can increase their surface area, fully expose the active sites, and improve mass transfer and electrocatalytic efficiency. Nonetheless, it remains a challenge to fabricate M‐N‐C nanomaterials with both well‐defined morphology and hierarchical porous structures. Herein, high‐quality 2D Cu‐N‐C nanodisks (NDs) with biomimic stomata‐like interconnected hierarchical porous topology are synthesized via carbonization of Cu‐tetrapyridylporphyrin (TPyP)‐metal–organic frameworks (MOFs) precursors and followed by etching the carbonization product (Cu@Cu‐N‐C) along with re‐annealing treatment. Such hierarchical porous Cu‐N‐C NDs possess high specific surface area (293 m 2 g −1 ) and more exposed Cu single‐atom sites, different from their counterparts (Cu@Cu‐N‐C) and pure N‐C control catalysts. Electrochemical tests in alkaline media reveal that they can efficiently catalyze ORR with a half‐wave potential of 0.85 V (vs reversible hydrogen electrode), comparable to Pt/C and outperforming Cu@Cu‐N‐C, N‐C, Cu‐TPyP‐MOFs, and most other reported M‐N‐C catalysts. Moreover, their stability and methanol‐tolerant capability exceed Pt/C. This work may shed some light on optimizing 2D M‐N‐C nanostructures through bio‐inspired pore structure engineering, and accelerate their applications in fuel cells, artificial photosynthesis, or other advanced technological fields.