02525nas a2200289   4500008004100000245010200041210006900143260000900212300001400221490000600235520159000241653001701831653001401848653001401862653002101876653002101897653001901918653001501937653002701952100002201979700001902001700002302020700001802043700002202061700002002083856013202103       2024                        eng d00aDurable and stable bifunctional Co3O4-based nanocatalyst for oxygen reduction/evolution reactions0 aDurable and stable bifunctional Co3O4based nanocatalyst for oxyg  cFEB   a3620-36300 v73 a<p>
	The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are recognized as the core reaction processes in regenerative energy storage and conversion systems. The design of cost-effective and high-performance bifunctional ORR/OER electrocatalysts (ECs) is very important for their substantial commercialization. Herein, sponge-like Co3O4 nanoparticles anchored on carbon (Sp-Co3O4/C) are successfully fabricated by a facile two-step solvothermal strategy for ORR/OER in an alkaline electrolyte. The Sp-Co3O4/C EC exhibits promising bifunctional ORR/OER activity with ORR onset potential (E onset = 0.88 V vs RHE), half-wave potential (E (1/2) = 0.75 V), limiting current density (j = -6.60 mA cm(-2)), OER onset potential (E-onset = 1.26 V), and OER overpotential for 10% energy conversion (eta(10) = 0.38 V) in 0.1 M KOH. It demonstrates a significantly lower reversibility index (Delta E = E- j10 - E 1/2 = 0.86 V), comparable to standard Pt/C and RuO2 ECs. The superior ORR/OER performances of Sp-Co3O4/C EC can be ascribed to the synergistic contribution of a high electrochemically active surface area (48.33 m(2) g(-1)), BET surface area (131 m(2) g(-1)), the rich interfacial structure of the crystal facets (111), (220), and (311), and the abundant oxygen vacancies in the sponge-like morphology. Besides the methanol tolerance, accelerated durability and chronoamperometric test established excellent durability and stability in the electrocatalytic operation. This work offers insight into the development of high-performance ORR/OER ECs. [GRAPHICS]</p>
10abifunctional10afuel cell10ainterface10aoxygen evolution10aoxygen reduction10aOxygen vacancy10aSp-Co3O4/C10asponge-like morphology1 aChutia, Bhugendra1 aChetry, Rashmi1 aRao, Komateedi, N.1 aSingh, Nittan1 aSudarsanam, Putla1 aBharali, Pankaj  uhttps://library.ncl.res.in/content/durable-and-stable-bifunctional-co3o4-based-nanocatalyst-oxygen-reductionevolution-reactions