Self-supported porous Cobalt Oxide Nanowires with enhanced Electrocatalytic performance toward Oxygen evolution reaction

Xia, Han; Peng, Zhen; Lv, Cuncai; Zhao, Yaoxing; Hao, Jinhui; Huang, Zhipeng

doi:10.1007/s12039-016-1192-z

Cited by 10 publications

(5 citation statements)

References 36 publications

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“…These results indicated the formation of Cu0.92Co2.08O4, CuO, and Cu2O through the electrodeposition and heat treatment [37]. The Co oxide structure is more stable than Co hydroxide for OER [35,36]. Thus, TEM and XPS analyses were performed to enable the precise structural analysis and chemical states of oxide species in the electrodes annealed at 250 • C, respectively.…”

Section: Resultsmentioning

confidence: 98%

“…However, after annealing at 300 • C or above, the surface morphology became particle-like because of the structural breaking and aggregation of the nanosheets (Figure 3d). The XRD patterns (Figure 4) The Co oxide structure is more stable than Co hydroxide for OER [35,36]. Thus, TEM and XPS analyses were performed to enable the precise structural analysis and chemical states of oxide species in the electrodes annealed at 250 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The Co oxide structure is more stable than Co hydroxide for OER [ 35 , 36 ]. Thus, TEM and XPS analyses were performed to enable the precise structural analysis and chemical states of oxide species in the electrodes annealed at 250 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

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

et al. 2021

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“…In 2016, Xia et al pioneered the self-supported porous cobalt oxide (Co 3 O 4 ) nanowires on carbon fiber paper (CFP) through the dual-step hydrothermal-annealing method. [316] Herein, the vertically allocated nanowire array of active components that are cultivated directly on current collectors has harnessed a tight coupling effect, thereby constructing a short electron migration route and improving electron transport and electrolyte diffusion. [317] In the meantime, the 3D nanowire array remarkably boosted the escape of as-formed gas from the electrode surface and bestowed a stable and rapid current increment.…”

Section: Self-supported Electrocatalysts For Oermentioning

confidence: 99%

Self‐Supported Earth‐Abundant Carbon‐Based Substrates in Electrocatalysis Landscape: Unleashing the Potentials Toward Paving the Way for Water Splitting and Alcohol Oxidation

Yap,

Loh,

et al. 2023

Advanced Energy Materials

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In the vast realm of scientific inquiry, the pursuit of hydrogen fuel production through electrochemical water splitting offers a promising gateway to green energy generation, alleviating the challenges posed by resource scarcity. However, conventional water splitting encounters hurdles like low efficiency and the sluggish oxygen evolution reaction (OER), which prompt searchers to seek for alternative oxidation process. Significant strides are made in conventional electrocatalytic research employing polymeric binders, resulting in commendable catalytic activity and minimal electron migration resistance. Yet, a pivotal breakthrough in this rapidly evolving field lies in the innovative conception of carbon‐based self‐supported electrocatalysts, heralding a promising trajectory ahead. This review delves into the essential electro‐activity parameters to establish the property‐activity nexus, emphasizing the benefits of self‐supported carbon‐based electrodes. Noteworthy advancements are demonstrated in electrochemical hydrogen evolution reaction (HER), OER, overall water splitting (OWS), and bifunctional HER and alcohol oxidation reaction (AOR), driven by a diverse range of self‐supported electrocatalysts. These include structure‐dependent materials such as metal oxides, hydroxides/oxyhydroxides, phosphides, sulfides, selenides, nitrides, and carbides, each meticulously tailored with nuanced modifications that shape their distinctive attributes. This field also acknowledges its challenges and opportunities, providing guidance for potential research directions and inspiring interdisciplinary collaboration among scientists.

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“…Hence, the electrodeposition method has been introduced as an attractive and tunable technique for the fabrication of nano structure materials in energyrelated applications. Regarding the importance of the morphology of the electrocatalyst in its performance [21][22][23][24][25][26][27], a variety of electrodeposited cobalt morphologies such as nanosheet, nanoparticles, nanoflakes, etc, have also been investigated [28][29][30][31][32][33][34]. In flakelike struc tures, the geometrical parameters of the nanoflakes (their diameter, thickness, and aspect ratio) as well as the nanoflake density on the surface are definitely determinant factors in their final performance.…”

Section: Introductionmentioning

confidence: 99%

Engineered cost-effective growth of Co-based nanoflakes as a sustainable water oxidation electrocatalyst

Pourreza

Naseri

2017

J. Phys. D: Appl. Phys.

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Developing low-cost, scalable and reproducible synthesis methods for water oxidation reaction (WOR) catalysts is highly desirable and also challenging in energy, environmental and industrial applications. In this context, electrochemical deposition is known as an easy and cost-effective technique in nanomaterial growth. Herein, cobalt-based nanoflakes were grown on a flexible and commercially available steel mesh substrate by electrodeposition approach with a crystalline structure as a mixture of oxide, hydroxide and oxyhydroxide phases. For the first time, the correlation between electrodeposition parameters, time and current density, and morphological characteristics of the grown nanoflakes (density and aspect ratio based on SEM results) has been derived. According to a comprehensive study of the flakes’ electrocatalytic performance in WOR, the optimized sample fabricated with a moderate electrodeposition current density (7 mA cm−2) and duration time (2000 s) revealed the highest density (7.6 × 108 cm−2) and aspect ratio (7.1) as well as the lowest values for overpotential (OP = 324 mV) and charge transfer resistance (14 Ω). This designed array of Co-based nanoflakes also showed the lowest value of overpotential for bare cobalt-based WOR electrocatalysts reported yet. High and low values for deposition current density and/or deposition time had a negative effect on the sample surface, leaving some areas without any flakes or with incomplete and inefficient formation of nanoflakes with low densities and aspect ratios. A similar effect was observed for annealed samples in the range of 200–400 °C. Based on recorded overpotentials and extracted surface morphological parameters, a linear and logarithmic behavior in overpotential–flake density dependency was proposed for current density and time controlled systems, respectively.

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Self-supported porous Cobalt Oxide Nanowires with enhanced Electrocatalytic performance toward Oxygen evolution reaction

Cited by 10 publications

References 36 publications

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

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

Self‐Supported Earth‐Abundant Carbon‐Based Substrates in Electrocatalysis Landscape: Unleashing the Potentials Toward Paving the Way for Water Splitting and Alcohol Oxidation

Engineered cost-effective growth of Co-based nanoflakes as a sustainable water oxidation electrocatalyst

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