Cobalt-based composite films on electrochemically activated carbon cloth as high performance overall water splitting electrodes

Kordek, Karolina; Yin, Huajie; Rutkowski, Piotr; Zhao, Huijun

doi:10.1016/j.ijhydene.2018.02.095

Cited by 36 publications

(14 citation statements)

References 47 publications

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“…[50] The enhanced hydrophilicity of Cu-doped Co(OH) 2 nanosheets made ionic species more accessible to the active sites. [51,52] Thus, OH À ions had a higher diffusion capacity on Cu-doped Co(OH) 2 nanosheets. The uptake of OH À ions can form more intermediates for urea dissociation.…”

Section: Resultsmentioning

confidence: 97%

“…The partially distorted cobalt surroundings caused by Cu dopant can reduce the adsorption energy of water, thermodynamically facilitated the adsorption of water molecules to the active sites [50] . The enhanced hydrophilicity of Cu‐doped Co(OH) 2 nanosheets made ionic species more accessible to the active sites [51,52] . Thus, OH − ions had a higher diffusion capacity on Cu‐doped Co(OH) 2 nanosheets.…”

Section: Resultsmentioning

confidence: 99%

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Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Wang

Zhang

et al. 2021

ChemElectroChem

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Urea electrolysis supplies a great potential in energy-saving hydrogen generation accompanied by simultaneous ureacontaining wastewater remediation. Herein, the Co(OH) 2 nanosheets arrays doped by different amount of Cu 2 + ions were prepared via a one-step solution-phase method for ureaassisted electrolytic hydrogen generation. The Cu integration can regulate electronic structure, activate Co active sites at low potential, and optimize the charge transfer properties and adsorption states of the catalyst. Moreover, the partially distorted cobalt surroundings caused by Cu dopant in the catalyst is conductive to favor the adsorption of urea and water molecules to the active sites. The optimal Cu 6.2% -Co(OH) 2 nanosheets array exhibited superior urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) performances. Assembling an overall urea electrolyzer using two Cu 6.2% -Co(OH) 2 electrodes gave rise to very small voltages of 1.389 V for 10 mA cm À 2 and 1.781 V for a high current density of 500 mA cm À 2 with remarkable operational stability. The Cu 2 + ions doping strategy can be extended to a series of Ni-based compounds with adjustable electronic structures for boosting the activities of UOR and HER.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Wang

Zhang

et al. 2021

ChemElectroChem

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“…The activation process was carried out in the two-electrode system in the aqueous solution of 0.1 M (NH 4 ) 2 SO 4 and 2 M NH 4 OH using carbon cloth as the anode and carbon rod as the cathode (a DC voltage of 10 V, 2 min). After the activation, the carbon cloth was thoroughly washed with water [ 94 ]. Another activation method of carbon cloth included mild chemical oxidation of raw carbon cloth pieces in an aqueous solution of 98% H 2 SO 4 and 70% HNO 3 acids at 70 °C for 24 h. After washing with copious amounts of water and drying, the carbon cloth pieces were transferred to a muffle furnace and calcined at 500 °C for 2 h under an air atmosphere [ 95 ].…”

Section: Synthesis Of Carbon-based Nanocompositesmentioning

confidence: 99%

Carbon-Based Composites as Electrocatalysts for Oxygen Evolution Reaction in Alkaline Media

et al. 2021

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This review paper presents the most recent research progress on carbon-based composite electrocatalysts for the oxygen evolution reaction (OER), which are of interest for application in low temperature water electrolyzers for hydrogen production. The reviewed materials are primarily investigated as active and stable replacements aimed at lowering the cost of the metal electrocatalysts in liquid alkaline electrolyzers as well as potential electrocatalysts for an emerging technology like alkaline exchange membrane (AEM) electrolyzers. Low temperature electrolyzer technologies are first briefly introduced and the challenges thereof are presented. The non-carbon electrocatalysts are briefly overviewed, with an emphasis on the modes of action of different active phases. The main part of the review focuses on the role of carbon–metal compound active phase interfaces with an emphasis on the synergistic and additive effects. The procedures of carbon oxidative pretreatment and an overview of metal-free carbon catalysts for OER are presented. Then, the successful synthesis protocols of composite materials are presented with a discussion on the specific catalytic activity of carbon composites with metal hydroxides/oxyhydroxides/oxides, chalcogenides, nitrides and phosphides. Finally, a summary and outlook on carbon-based composites for low temperature water electrolysis are presented.

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“…Both types of research achieve greater than 90 % COD removal and have a lower energy demand. Carbon cloth is a cheap, flexible, and highly conductive textile, which can also be used to construct a stable three-dimensional (3D) flexible electrode [45][46][47].…”

Section: Anode Cathode Configurationmentioning

confidence: 99%

Microbial Fuel Cell Membrane Bioreactor in Wastewater Treatment, Electricity Generation and Fouling Mitigation

et al. 2020

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Membrane bioreactors (MBR) have gained much attention due to their ability to achieve higher treatment efficiency. However, high external energy consumption in aeration for membrane fouling mitigation has been limiting their application. Microbial fuel cells (MFC) can ideally extract energy from wastewater in the form of electricity and reduce membrane fouling. Thus, the use of MFC‐MBR is rapidly expanding. However, the MFC‐MBR design and operation is not fully mature and further research is needed to optimize the process efficiency and enhance the applicability. This review gives an overview of recent studies on the performances of MFC‐MBR systems, regarding the design and configuration of the integrated system, irrespective of whether optimization was done or not in the operating system.

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Cobalt-based composite films on electrochemically activated carbon cloth as high performance overall water splitting electrodes

Cited by 36 publications

References 47 publications

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Carbon-Based Composites as Electrocatalysts for Oxygen Evolution Reaction in Alkaline Media

Microbial Fuel Cell Membrane Bioreactor in Wastewater Treatment, Electricity Generation and Fouling Mitigation

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Cobalt-based composite films on electrochemically activated carbon cloth as high performance overall water splitting electrodes

Cited by 36 publications

References 47 publications

Co(OH)2 Nanosheets Array Doped by Cu2+ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Co(OH)2 Nanosheets Array Doped by Cu2+ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Carbon-Based Composites as Electrocatalysts for Oxygen Evolution Reaction in Alkaline Media

Microbial Fuel Cell Membrane Bioreactor in Wastewater Treatment, Electricity Generation and Fouling Mitigation

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Product

Resources

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Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation