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Synthesis of Bimetallic Conductive 2D Metal–Organic Framework (Co x Ni y ‐CAT) and Its Mass Production: Enhanced Electrochemical Oxygen Reduction Activity
Author(s) -
Yoon Hajin,
Lee Sujeong,
Oh Sojin,
Park Heejun,
Choi Sora,
Oh Moonhyun
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.201805232
Subject(s) - bimetallic strip , catalysis , electrochemistry , chemistry , metal organic framework , context (archaeology) , metal , nanotechnology , chemical engineering , materials science , electrode , organic chemistry , adsorption , engineering , paleontology , biology
The development of new electrocatalysts for electrochemical oxygen reduction to replace expensive and rare platinum‐based catalysts is an important issue in energy storage and conversion research. In this context, conductive and porous metal–organic frameworks (MOFs) are considered promising materials for the oxygen reduction reaction (ORR) due to not only their high surface area and well‐developed pores but also versatile structural features and chemical compositions. Herein, the preparation of bimetallic conductive 2D MOFs (Co x Ni y ‐CATs) are reported for use as catalysts in the ORR. The ratio of the two metal ions (Co 2+ and Ni 2+ ) in the bimetallic Co x Ni y ‐CATs is rationally controlled to determine the optimal composition of Co x Ni y ‐CAT for efficient performance in the ORR. Indeed, bimetallic MOFs display enhanced ORR activity compared to their monometallic counterparts (Co‐CAT or Ni‐CAT). During the ORR, bimetallic Co x Ni y ‐CATs retain an advantageous characteristic of Co‐CAT in relation to its high diffusion‐limiting current density, as well as a key advantage of Ni‐CAT in relation to its high onset potential. Moreover, the ORR‐active bimetallic Co x Ni y ‐CAT with excellent ORR activity is prepared at a large scale via a convenient method using a ball‐mill reactor.