Diethylenetriamine (DETA)-assisted anchoring of Co₃O₄nanorods on carbon nanotubes as efficient electrocatalysts for the oxygen evolution reaction

Abstract

A Co 3 O 4 nanorod-multiwalled carbon nanotube hybrid (Co 3 O 4 @MWCNT) has been fabricated as a highly efficient electrocatalyst for water oxidation in alkaline electrolytes. The well-defined Co 3 O 4 nanorods were successfully anchored onto mildly oxidized MWCNTs with the assistance of diethylenetriamine (DETA) following a simple route. The as-prepared hybrid possesses a promising BET specific surface area of about 252 m 2 g À1 and shows excellent electrocatalytic activity towards oxygen evolution reactions (OERs) with an onset potential of about 0.47 V vs. Ag/AgCl and an overpotential of 309 mV to achieve a current density of 10 mA cm À2 in 1.0 mol L À1 KOH. In addition, the Co 3 O 4 @MWCNT catalyst exhibits prominent stability during long-term electrolysis of water. We attribute the enhanced performance to a synergic effect between MWCNTs and Co 3 O 4 nanorods by gaining insight into the electrochemical properties of the Co 3 O 4 @MWCNT hybrid. This work offers a useful way to synthesize one-dimensional (1D) metal oxides combined with 1D carbon materials for wide applications in energy storage and conversion.

Cost-Effective and Facile Preparation of Fe2O3 Nanoparticles Decorated N-Doped Mesoporous Carbon Materials: Transforming Mulberry Leaf into a Highly Active Electrocatalyst for Oxygen Reduction Reactions

“…As Figure 3B shows, the D and G bands are existent in all of the prepared catalysts, the I D /I G ratio was calculated to be 1.08 for Fe 2 O 3 /N-PCs-800, 1.60 for Fe 2 O 3 /N-PCs-850, and 1.32 for Fe 2 O 3 /N-PCs-900. Such enormous defects are associated with the incorporation of heteroatoms into the sp 2 -carbon structure, which are anticipated to result in the boosting of ORR activity [43,44].…”

Transition‐Metal (Co, Ni, and Fe)‐Based Electrocatalysts for the Water Oxidation Reaction

“…For the latter ones, transition‐metal oxides/hydroxides and their derivatives are the subject of intense research. Compared to molecular catalysts, these heterogeneous catalysts possess many advantages, such as relatively low cost, low toxicity, great flexibility in terms of structure and morphology, and long‐term corrosion resistance in alkaline solution . In the past few decades, extensive research on Co‐/Ni‐/Fe‐based materials has been reported to improve their performance, and promising results have been shown.…”

Anchoring H3PW12O40 on aminopropylsilanized spinel‐type cobalt oxide (Co3O4‐SiPrNH2/H3PW12O40): A novel nanohybrid adsorbent for removing cationic organic dye pollutants from aqueous solutions

“…Spinel‐type cobalt oxide (Co 3 O 4 ) is a transition metal oxide with high thermal and chemical stability, low solubility, as well as interesting electronic, magnetic and catalytic properties . Due to these excellent characteristics such as its resistance to severe acidic and basic conditions, it can be applied as an appropriate support for immobilizing POMs.…”