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Confining Chainmail‐Bearing Ni Nanoparticles in N‐doped Carbon Nanotubes for Robust and Efficient Electroreduction of CO 2
Author(s) -
Niu Yongjian,
Zhang Chunhua,
Wang Yuanyuan,
Fang Dong,
Zhang Linlin,
Wang Cheng
Publication year - 2021
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.202002596
Subject(s) - carbon nanotube , materials science , calcination , faraday efficiency , catalysis , chemical engineering , nickel , electrochemistry , nanotechnology , nanoparticle , metallurgy , chemistry , electrode , organic chemistry , engineering
It still remains challenging to simultaneously achieve high stability, selectivity, and activity in CO 2 reduction. Herein, a dual chainmail‐bearing nickel‐based catalyst (Ni@NC@NCNT) was fabricated via a solvothermal‐evaporation‐calcination approach. In situ encapsulated N‐doped carbon layers (NCs) and nanotubes (NCNTs) gave a dual protection to the metallic core. The confined space well maintained the local alkaline pH value and suppressed hydrogen evolution. Large surface area and abundant pyridinic N and Ni δ + sites ensured high CO 2 adsorption capacity and strength. Benefitting from these, it delivered a CO faradaic efficiency of 94.1 % and current density of 48.0 mA cm −2 at −0.75 and −1.10 V, respectively. Moreover, the performance remained unchanged after continuous electrolysis for 43 h, far exceeding Ni@NC with single chainmail, Ni@NC/NCNT with Ni@NC sitting on the walls of NCNT, bare NCNT and most state‐of‐the‐art catalysts, demonstrating structural superiority of Ni@NC@NCNT. This work sheds light on designing unique architectures to improve electrochemical performances.