Cross-Linked CoMoO4/rGO Nanosheets as Oxygen Reduction Catalyst

Abstract

Development of inexpensive and robust electrocatalysts towards oxygen reduction reaction (ORR) is crucial for the cost-affordable manufacturing of metal-air batteries and fuel cells. Here we show that cross-linked CoMoO 4 nanosheets and reduced graphene oxide (CoMoO 4 /rGO) can be integrated in a hybrid material under one-pot hydrothermal conditions, yielding a composite material with promising catalytic activity for oxygen reduction reaction (ORR). Cyclic voltammetry (CV) and linear sweep voltammetry (LSV) were used to investigate the efficiency of the fabricated CoMoO 4 /rGO catalyst towards ORR in alkaline conditions. The CoMoO 4 /rGO composite revealed the main reduction peak and onset potential centered at 0.78 and 0.89 V (vs. RHE), respectively. This study shows that the CoMoO 4 /rGO composite is a highly promising catalyst for the ORR under alkaline conditions, and potential noble metal replacement cathode in fuel cells and metal-air batteries.

Synthesis of Graphite Oxide/Cobalt Molybdenum Oxide Hybrid Nanosheets for Enhanced Electrochemical Performance in Supercapacitors and the Oxygen Evolution Reaction

“…[10] The specific capacitance of CoMoO 4 /graphene composites was reported to be~395 F/g at 1 mV/s. [13] NiCo 2 O 4 @CoMoO 4 /NF hetero-structured materials are reported as bi-functional electrocatalyst in water splitting reactions for OER and HER. Due to low cost and high intrinsic activities of cobaltÀ molybdenum bimetallic oxides, they are also considered as promising electrocatalysts in water splitting reactions for OER.…”

“…[12] CoMoO 4 /rGO nanocomposites were also reported as ORR electrocatalysts. [13] NiCo 2 O 4 @CoMoO 4 /NF hetero-structured materials are reported as bi-functional electrocatalyst in water splitting reactions for OER and HER. [14] Moreover, WO 3 /α-Fe 2 O 3 hetero-structures have shown potential applications in photoelectrochemical water oxidation reactions.…”

Synthesis of molybdates Zn1-xCoxMoO4 (0 ≤ x ≤ 1), by decomposition of the precursors developed by the glycine-nitrate process (GNP), and their characterization

“…According to the literature, MoOn polyhedrons, MoO 4 tetrahedrons and MoO 6 octahedrons give Raman strong bands. Generally, Raman bands corresponding to the symmetrical stretching (u1) and asymmetrical stretching (u 3 ) modes were observed in the 700-1000 cm-1 region, whereas th ose corresponding to the symmetrical modes ( u2) and asynunetrical modes ( u 4 ) were observed in the 50-520 cm-1 region [23][24][25]. For the Zno_7Coo.sMoO 4 composition, the most intense Raman vibrations were observed al 955 and 933 cm-', they correspond to the symmetrical stretching modes (u 1 ) of the MoO 4 tetrahedron [26].…”

Evaluation of a ZnO–NiO/rGO hybrid electrocatalyst for enhanced oxygen reduction reaction (ORR) applications

“…23 Based on their availability in nature and affordable cost, TMOs such as zinc, cobalt, iron, tin, nickel, manganese, and chromium oxide have been employed as alternative materials. [24][25][26] Many researchers have analyzed TMO-based GO composites such as ZnOÁrGO, 27 NiCoMnO 2 /N-rGO, 28 Cu 0.31 NiO 0.69 /rGO, 29 TiO 2 /rGO, 30 Ni-CeO 2 /rGO, 31 CoMoO 4 /rGO, 32 and CuO-NiO/ rGO 33 as electrocatalysts in ORR applications. As a result, the starting potential and current density of the composite materials increased due to the synergistic effect of TMO incorporation with rGO.…”