Atomic Layer Deposition of NiO on Self‐Supported Co₃O₄ Nanoneedle Array for Electrocatalytic Methanol Oxidation Reaction

Abstract

Developing efficient transition metal oxide catalysts is still challenging for direct methanol fuel cells. Herein, an atomic layer deposition method to prepare NiO on a self-supported Co 3 O 4 nanoneedle array grown on a porous nickel foam substrate (NiO-Co 3 O 4 NA@NF) as the electrode for the methanol oxidation reaction (MOR) is reported. The synergistic effect between the NiO and Co 3 O 4 components as well as the specific 3D nanoarray structure can endow the prepared NiO-Co 3 O 4 NA@NF with a very promising MOR catalytic activity. As a result, the NiO-Co 3 O 4 NA@NF catalyst shows a low onset potential (1.27 V vs reversible hydrogen electrode [RHE]), a high current density (173 mA cm À2 @1.524 V vs RHE), and good stability in MOR. This work demonstrates the feasibility of the atomic layer deposition strategy in fabricating complex oxides-based highperformance electrocatalysts.

Research progress of Co-based spinel oxide materials for direct methanol fuel cells

“…In addition to these metal-doped Co 3 O 4 , related theories have been proposed in reports of mixing with other materials such as CeO 2 , 65 NiO, 66,67 carbon dots (CDs), 68 and NiCo 2 O 4 . 69 Cheng et al 66 reported their experimental exploration (Fig.…”

“…In addition to these metal-doped Co 3 O 4 , related theories have been proposed in reports of mixing with other materials such as CeO 2 , 65 NiO, 66,67 carbon dots (CDs), 68 and NiCo 2 O 4 . 69 Cheng et al 66 reported their experimental exploration (Fig. 8 The morphology and structure of spinels also have an important influence on the catalytic activity of the material, and various forms of micro/nano-structured materials have been designed.…”

Review and Development of Anode Electrocatalyst Carriers for Direct Methanol Fuel Cell

“…Direct contact of the active components reduces the reaction's activation energy, and the kinetics of catalytic methanol oxidation is considerably increased. [ 168 ] Ni foams have considerable bulk and charge transport benefits as self‐supporting catalyst carriers, but their sensitivity to breakdown at high temperatures restricts their use. As a result, its alteration or surface modification is critical and warrants more investigation.…”

Enhanced Methanol Electrooxidation Performance Based on Pt Cluster‐Decorated CuCoO2 on Carbon

“…Furthermore, Co-based oxides have been proved to have promotion effect on catalyzing performance. [16,17,[50][51][52][53] Shahrokhian et al synthesized a Pd-NiCoO x /C catalyst and proved that Pd-NiCoO x /C catalyst had better electrochemical activity and stability than Pd-NiO catalyst. [54] Zhang et al investigated a Pd/ Co@CoO-rGO catalyst, which showed better activity and stability than the commercial Pd/C, the commercial Pt/C, Pd/ rGO and Pd/Ni@NiO-rGO catalysts.…”

“…As a result, researches about delafossite oxides towards electrocatalytic reactions such as oxygen reduction reaction, [48] oxygen evolution reaction [47,49] and hydrogen evolution reaction [47] have attracted extensive research interest. Furthermore, Co‐based oxides have been proved to have promotion effect on catalyzing performance [16,17,50–53] . Shahrokhian et al.…”