Spent tea leaves templated synthesis of highly active and durable cobalt-based trifunctional versatile electrocatalysts for hydrogen and oxygen evolution and oxygen reduction reactions

Imam, Muhammad A.; Santiago, Alain R. Puente; Rodrı́guez, Alejandro; Alvarado-Tenorio, Bonifacio; Bernal, Ricardo A.; Luque, Rafael; Noveron, Juan C.

doi:10.1039/d0gc02155e

Cited by 42 publications

(35 citation statements)

References 59 publications

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“…[39] When the impregnated plant leaves are pyrolyzed under an inert atmosphere, carbonization of the biomass takes place and results in transition metal nanoparticles supported on heteroelement substituted carbon materials. [40][41][42] On the downside, due to the reductive properties of carbon under heat treatment, this approach often leads to highly reduced transition metalbased nanoparticles. Thus, it is challenging to obtain transition metal species with higher oxidation states because thermal oxidation of the nanoparticles under air can combust the carbon support.…”

Section: Introductionmentioning

confidence: 99%

Large‐Scale Production of Carbon‐Supported Cobalt‐Based Functional Nanoparticles for Oxygen Evolution Reaction

2021

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A series of Co-based nanoparticles supported on activated carbon was synthesized by using waste tea leaves as a template as well as a sustainable carbon source. The crystal structure of the Co particles was adjusted by post-treatments with H 2 O 2 , ethanol vapor, and H 2 , which result in Co 3 O 4 , CoO, and metallic Co phases, respectively. After these different treatments, the composite materials consist of small Co-based nanoparticles with an average crystallite size of 6-14 nm supported on activated carbon with apparent specific surface areas up to 1065 m 2 g À 1 . Correlations between the structure of the materials and their activity for the oxygen evolution reaction (OER) were established, whereby the post-treatment with ethanol vapor was found to yield the most effective electrocatalyst. The material shows good stability at 10 mA cm À 2 over 10 h and reaches a mass activity of 2.9 A mg Co À 1 , which is even higher than pristine ordered mesoporous Co 3 O 4 . The superior electrocatalytic performance is ascribed to a high dispersion of Cobased nanoparticles and the conductivity of the activated carbon that facilitate the charge transport.

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Section: Introductionmentioning

confidence: 99%

Large‐Scale Production of Carbon‐Supported Cobalt‐Based Functional Nanoparticles for Oxygen Evolution Reaction

2021

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“…Presently, wastewater treatment technologies for organic removal have been reported, from basic to advanced levels, such as adsorption, oxidation, catalysis, photocatalysis, advanced oxidation process, electrochemical oxidation and filtration, membrane bioreactor, anaerobic digestion, etc. [4][5][6] However, the cost and technical considerations, especially in operational and maintenance, present a drawback in their application. In addition, more attention has been given to the technologies which provide green by-products, such as methane gas, fertilizer, electricity, water, etc.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Power Generation and Organic Removal in Double Anode Chamber Designed Dual-Chamber Microbial Fuel Cell (DAC-DCMFC)

Samudro

Imai

Hung

2021

Water

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One of the important factors in enhancing the performance of microbial fuel cells (MFCs) is reactor design and configuration. Therefore, this study was conducted to evaluate the regressors and their operating parameters affecting the double anode chamber–designed dual-chamber microbial fuel cell (DAC-DCMFC) performance. Its primary design consists of two anode chamber compartments equipped with a separator and cathode chamber. The DAC-DCMFCs were parallelly operated over 8 days (60 days after the acclimation period). They were intermittently pump-fed with the different organic loading rates (OLRs), using chemically enriched sucrose as artificial wastewater. The applied OLRs were adjusted at low, medium, and high ranges from 0.4 kg.m−3.d−1 to 2.5 kg.m−3.d−1. The reactor types were type 1 and type 2 with different cathode materials. The pH, temperature, oxidation-reduction potential (ORP), optical density 600 (OD600), chemical oxygen demand (COD), and total organic carbon (TOC) were measured, using standard analytical instruments. In general, the power production achieved a maximum of 866 ± 44 mW/m2, with a volumetric power density of 5.15 ± 0.26 W/m3 and coulombic efficiency of 84%. Two-stage COD and TOC removal at medium OLR achieved a range of 60–80%. Medium OLR is the recommended level to enhance power production and organic removal in DAC-DCMFC. The separated anode chambers into two parts in a dual anode chamber microbial fuel cell adjusted by various organic loadings expressed a preferable comprehension in the integrated MFCs for wastewater treatment.

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“…To develop new classes of green, sustainable, and low-cost carbon-based catalysts, new approaches have emerged [27]. Some strategies have been proposed using biomass or waste-derived materials for both the production of green and sustainable carbonaceous materials with high surface area and for the enhancement of dispersion and exposure of the catalytic sites [28]. Metal-and N-doped carbons have demonstrated to be excellent electrocatalysts [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Mechanochemically Synthetized PAN-Based Co-N-Doped Carbon Materials as Electrocatalyst for Oxygen Evolution Reaction

et al. 2021

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We report a new class of polyacrylonitrile (PAN)-based Co-N-doped carbon materials that can act as suitable catalyst for oxygen evolution reactions (OER). Different Co loadings were mechanochemically added into post-consumed PAN fibers. Subsequently, the samples were treated at 300 °C under air (PAN-A) or nitrogen (PAN-N) atmosphere to promote simultaneously the Co3O4 species and PAN cyclization. The resulting electrocatalysts were fully characterized and analyzed by X-ray diffraction (XRD) and photoelectron spectroscopy (XPS), transmission (TEM) and scanning electron (SEM) microscopies, as well as nitrogen porosimetry. The catalytic performance of the Co-N-doped carbon nanomaterials were tested for OER in alkaline environments. Cobalt-doped PAN-A samples showed worse OER electrocatalytic performance than their homologous PAN-N ones. The PAN-N/3% Co catalyst exhibited the lowest OER overpotential (460 mV) among all the Co-N-doped carbon nanocomposites, reaching 10 mA/cm2. This work provides in-depth insights on the electrocatalytic performance of metal-doped carbon nanomaterials for OER.

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Spent tea leaves templated synthesis of highly active and durable cobalt-based trifunctional versatile electrocatalysts for hydrogen and oxygen evolution and oxygen reduction reactions

Abstract: The rational design of high-performance trifunctional catalysts for oxygen reduction, oxygen and hydrogen evolution reactions is of vital importance for the implementation of green energy conversion technologies. Herein, trifunctional electrocatalysts...

Cited by 42 publications

References 59 publications

Large‐Scale Production of Carbon‐Supported Cobalt‐Based Functional Nanoparticles for Oxygen Evolution Reaction

Large‐Scale Production of Carbon‐Supported Cobalt‐Based Functional Nanoparticles for Oxygen Evolution Reaction

Enhancement of Power Generation and Organic Removal in Double Anode Chamber Designed Dual-Chamber Microbial Fuel Cell (DAC-DCMFC)

Mechanochemically Synthetized PAN-Based Co-N-Doped Carbon Materials as Electrocatalyst for Oxygen Evolution Reaction

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