Three-Dimensional Honeycomb-Like Cu0.81Co2.19O4 Nanosheet Arrays Supported by Ni Foam and Their High Efficiency as Oxygen Evolution Electrodes

Choi, Woosung; Jang, Myeong Je; Park, Yoo Sei; Lee, Kyu Hwan; Lee, Joo Yul; Seo, Min‐Ho; Choi, Sung Mook

doi:10.1021/acsami.8b12478

Cited by 47 publications

(24 citation statements)

References 31 publications

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“…), while the high-cost and insufficient durability impede their largescale application [5][6][7]. Consequently, numerous efforts have been devoted to the development of low-cost and high-efficiency catalysts for precious-metal-based materials alternatives, including metal-free two-dimensional (2D) nanomaterials, such as h-BN, g-C 3 N 4 , and MXenes [8], transition metal oxides/chalcogenides/ nitrides/phosphides [9][10][11][12][13], and nitrogen-coordinated transition metal carbon (TM-N x -C) materials. Among them, TM-N x -C materials containing isolated single-atom active sites of N coordinated on carbon supports have been considered as one of the most promising candidates, owing to their high catalytic activity, the maximum atomic utilization, unique quantum size effects, and tunable electronic structure [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Coordination environments tune the activity of oxygen catalysis on single atom catalysts: A computational study

Xiao

Liu

et al. 2021

Nano Res.

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Designing highly efficient bifunctional electrocatalysts for oxygen reduction and evolution reaction (ORR/OER) is extremely important for developing regenerative fuel cells and metal-air batteries. Single-atom catalysts (SACs) have gained considerable attention in recent years because of their maximum atom utilization efficiency and tunable coordination environments. Herein, through density functional theory (DFT) calculations, we systematically explored the ORR/OER performances of nitrogencoordinated transition metal carbon materials (TM-N x -C (TM = Mn, Fe, Co, Ni, Cu, Pd, and Pt; x = 3, 4)) through tailoring the coordination environment. Our results demonstrate that compared to conventional tetra-coordinated (TM-N 4 -C) catalysts, the asymmetric tri-coordinated (TM-N 3 -C) catalysts exhibit stronger adsorption capacity of catalytic intermediates. Among them, Ni-N 3 -C possesses optimal adsorption energy and the lowest overpotential of 0.29 and 0.28 V for ORR and OER, respectively, making it a highly efficient bifunctional catalyst for oxygen catalysis. Furthermore, we find this enhanced effect stems from the additional orbital interaction between newly uncoordinated d-orbitals and p-orbitals of oxygenated species, which is evidently testified via the change of d-band center and integral crystal orbital Hamilton population (ICOHP). This work not only provides a potential bifunctional oxygen catalyst, but also enriches the knowledge of coordination engineering for tailoring the activity of SACs, which may pave the way to design and discover more promising bifunctional electrocatalysts for oxygen catalysis.

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Section: Introductionmentioning

confidence: 99%

Coordination environments tune the activity of oxygen catalysis on single atom catalysts: A computational study

Xiao

Liu

et al. 2021

Nano Res.

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“…Previous studies were conducted on Cu x Co 2-x O 4 (CCO) catalysts, which have higher conductivities as a result of the Cu doping of Co 3 O 4 . In addition, various approaches such as chemical deposition, hydrothermal methods, and electrodeposition have been used to improve the surface morphology and electrochemical and crystallographic properties of the CCO catalyst [22,23].…”

Section: Introductionmentioning

confidence: 99%

Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

et al. 2021

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Developing high performance, highly stable, and low-cost electrodes for the oxygen evolution reaction (OER) is challenging in water electrolysis technology. However, Ir- and Ru-based OER catalysts with high OER efficiency are difficult to commercialize as precious metal-based catalysts. Therefore, the study of OER catalysts, which are replaced by non-precious metals and have high activity and stability, are necessary. In this study, a copper–cobalt oxide nanosheet (CCO) electrode was synthesized by the electrodeposition of copper–cobalt hydroxide (CCOH) on Ni foam followed by annealing. The CCOH was annealed at various temperatures, and the structure changed to that of CCO at temperatures above 250 °C. In addition, it was observed that the nanosheets agglomerated when annealed at 300 °C. The CCO electrode annealed at 250 °C had a high surface area and efficient electron conduction pathways as a result of the direct growth on the Ni foam. Thus, the prepared CCO electrode exhibited enhanced OER activity (1.6 V at 261 mA/cm2) compared to those of CCOH (1.6 V at 144 mA/cm2), Co3O4 (1.6 V at 39 mA/cm2), and commercial IrO2 (1.6 V at 14 mA/cm2) electrodes. The optimized catalyst also showed high activity and stability under high pH conditions, demonstrating its potential as a low cost, highly efficient OER electrode material.

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“…The OER involves four electron-proton coupled reactions, and requires the use of a relatively higher amount of energy (higher overpotential) compared to the hydrogen evolution reaction (HER), which is a typical two electron-transfer reaction (Suen et al, 2017;Jang et al, 2020). To overcome these limitations, studies have been conducted with the aim to develop electrocatalysts to ensure the efficiency of the OER (Choi et al, 2018). Ir or Ru based catalysts demonstrate excellent catalytic properties with respect to the OER; however, because they are noble metals, they tend to be more expensive and scarce (Guo et al, 2019;Park et al, 2020a).…”

Section: Introductionmentioning

confidence: 99%

Electrodeposition of High-Surface-Area IrO2 Films on Ti Felt as an Efficient Catalyst for the Oxygen Evolution Reaction

et al. 2020

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Under acidic conditions, IrO 2 exhibits high catalytic activity with respect to the oxygen evolution reaction (OER). However, the practical application of Ir-based catalysts is significantly limited owing to their high cost in addition to the scarcity of the metal. Therefore, it is necessary to improve the efficiency of the utilization of such catalysts. In this study, IrO 2-coated Ti felt (IrO 2 /Ti) electrodes were prepared as high-efficiency catalysts for the OER under acidic conditions. By controlling the surface roughness of the Ti substrate via wet etching, the optimum Ti substrate surface area for application in the IrO 2 /Ti electrode was determined. Additionally, the IrO 2 film that was electrodeposited on the 30 min etched Ti felt had a large surface area and a uniform morphology. Furthermore, there were no micro-cracks and the electrode obtained (IrO 2 /Ti-30) exhibited superior catalytic performance with respect to the OER, with a mass activity of 362.3 A g −1 Ir at a potential of 2.0 V (vs. RHE) despite the low Ir loading (0.2 mg cm −2). Therefore, this proposed strategy for the development of IrO 2 /Ti electrodes with substrate surface control via wet etching has potential for application in the improvement of the efficiency of catalyst utilization with respect to the OER.

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Three-Dimensional Honeycomb-Like Cu_0.81Co_2.19O₄ Nanosheet Arrays Supported by Ni Foam and Their High Efficiency as Oxygen Evolution Electrodes

Cited by 47 publications

References 31 publications

Coordination environments tune the activity of oxygen catalysis on single atom catalysts: A computational study

Coordination environments tune the activity of oxygen catalysis on single atom catalysts: A computational study

Effects of Annealing Temperature on the Oxygen Evolution Reaction Activity of Copper–Cobalt Oxide Nanosheets

Electrodeposition of High-Surface-Area IrO2 Films on Ti Felt as an Efficient Catalyst for the Oxygen Evolution Reaction

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