Multifunctional electrocatalysts derived from conducting polymer and metal organic framework complexes

Author(s)

Khalid, Mohd. ^{[1, 2]} ; Honorato, Ana M. B. ^[2] ; Varela, Hamilton ^[1] ; Dai, Liming ^[2]

Affiliation

^[1] Univ Sao Paulo, Inst Chem Sao Carlos, POB 780, BR-13560970 Sao Carlos, SP - Brazil

^[2] Case Western Reserve Univ, Ctr Adv Sci & Engn Carbon Case4carbon, Dept Macromol Sci & Engn, 10900 Euclid Ave, Cleveland, OH 44106 - USA

• Document type: Journal article
• Source: NANO ENERGY; v. 45, p. 127-135, MAR 2018.
• Web of Science Citations: 47

Abstract

High cost, scarcity, and detrimental environmental effect of the noble-metal based catalysts have prompted the seek of less expensive, more benign, and earth abundant substitutes for energy conversion and storage. Here, we demonstrate a novel multifunctional electrocatalyst constructed by pyrolysis of the complex of polyaniline (PANI) and metal organic framework {[}Co-based MOF; zeolitic imidazolate framework (ZIF-67)]. The resultant PANI/ZIF-67 complex unveiled excellent electrocatalytic activities towards oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER) in alkaline medium. It was found that the catalytic activities of the PANI/ZIF-67 complex towards ORR, OER and HER could be tuned by simple changing the weight ratio of PANI to the MOF. Further, we tested the material as an air electrode for a primary zinc-air battery, demonstrating an open-circuit potential of 1.42 V and a peak power density of similar to 45 mW cm(-2) both are superior to those of its counterpart of the Pt/C air-electrode. The excellent multifunctional catalytic activities of the PANI/ZIF-67 are mainly attributed to the synergistic combination of cobalt nanoparticles, Co3O4, and nitrogen doped carbon from the PANI/ZIF-67 complex after pyrolysis. (AU)

• FAPESP's process: 12/24152-1 - Complex kinetics in electrochemical systems: mechanisms, stoichiometric network analysis and numerical simulations
• Grantee: Hamilton Brandão Varela de Albuquerque
• Support type: Scholarships abroad - Research
• FAPESP's process: 17/00433-5 - Design and synthesis of multifunctional metal-free electrocatalyst onto carbon fiber yarns for oxygen reduction, and oxygen and hydrogen evolution reactions
• Grantee: Mohmmad Khalid
• Support type: Scholarships in Brazil - Post-Doctorate
• FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
• Grantee: Edson Antonio Ticianelli
• Support type: Research Projects - Thematic Grants