Tunable compositions of Pd<sub>100−x</sub>Cu<sub>x</sub> catalysts towards the electrooxidation of ethanol and ethylene glycol

Babu, Sreejith P.; Elumalai, Perumal

doi:10.1039/c7nj02737k

Cited by 13 publications

(3 citation statements)

References 52 publications

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“…As observed in Figure d, the I f / I b of Pd–Bi 2 Te 3 -1/C is calculated to be about 2.76, which is much higher than those of Bi 2 Te 3 /C (1.51) and Pd/C (1.55), confirming the higher electrocatalytic activity of the Pd–Bi 2 Te 3 -1/C catalyst. More importantly, the electrocatalytic EGOR activity of Pd–Bi 2 Te 3 is also much better than those of the recently reported Pd-based electrocatalysts (Figure e). − In order to evaluate the reaction kinetics of the EGOR based on different electrodes, the Tafel plots of different electrocatalysts are also achieved. As shown in Figure a, Pd–Bi 2 Te 3 -1/C showed a Tafel slope of 138.4 mV dec –1 , which was smaller than those of Bi 2 Te 3 /C (325.0 mV dec –1 ) and Pd/C (196.5 mV dec –1 ), suggesting better reaction kinetics based on the Pd–Bi 2 Te 3 -1/C electrocatalyst.…”

Section: Resultsmentioning

confidence: 84%

Engineering Heterostructured Pd–Bi₂Te₃ Doughnut/Pd Hollow Nanospheres for Ethylene Glycol Electrooxidation

Huang

Zhao

et al. 2022

Inorg. Chem.

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The electrooxidation of ethylene glycol (EG) is of vital significance for the conversion from biomass energy into electrical energy via direct fuel cells. However, the EG oxidation reaction (EGOR) suffers from poor efficiency due to the limitation of high-performance electrocatalysts for cleaving the C–C bonds. Herein, this limitation is successfully addressed by fabricating the doughnut-shaped Pd–Bi2Te3 heterostructured catalyst. Notably, the heterojunction Pd–Bi2Te3 nanocatalyst has been demonstrated to be highly active toward the EGOR with superb activity and durability, in which a mass activity as high as 2420.8 mA mg–1 is achieved in alkaline media, being 1.7 times higher than that of the commercial Pd/C catalyst. Upon combination of experimental results with mechanism studies, it is indicated that the remarkable EGOR performance is attributed to the enlarged active areas that stemmed from the doughnut-like structure, as well as the strong synergistic effect from Pd–Bi2Te3 and Pd. More importantly, the highly electroactive Pd–Bi2Te3 can accelerate charge transfer and boost the oxidation of CO-like intermediates, which are conducive to the enhancement in electrochemical stability.

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Section: Resultsmentioning

confidence: 84%

Engineering Heterostructured Pd–Bi₂Te₃ Doughnut/Pd Hollow Nanospheres for Ethylene Glycol Electrooxidation

Huang

Zhao

et al. 2022

Inorg. Chem.

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“…Typically observed redox peaks are analogous to reported Pd based materials . The transformation of PdO to Pd peak is taking account for the determination of ECSA (m 2 g −1 ) with the following equation

true ECSA = normalQ / (0.405 / [Pd])

…”

Section: Resultsmentioning

confidence: 99%

“…Likewise, polyhydric alcohols such as ethylene glycol (EG) and glycerol are also blossoming now a day as fuel. EG has a high boiling point, much less volatile and having high theoretical energy density (5.87 kW h L −1 ) than methanol . So, the usage of EG during electrochemical oxidation may provide certain compensations like low fuel cross‐over property and high‐power density as well …”

Section: Introductionmentioning

confidence: 99%

Palladium/Copper Nanoalloy Supported on Carbon Nanotubes for the Electrooxidation of Methanol and Ethylene Glycol

et al. 2019

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Herein, we demonstrate the ultrasonic‐assisted synthesis of Palladium/Copper nanoalloy supported on carbon nanotubes (PdCu/CNT) towards the electro‐oxidation of methanol and ethylene glycol using Triton X‐100 as a stabilizer. Structural and morphological analysis manifests the formation of PdCu nanoalloy on the surface of CNTs. For the electrochemical comparison, PdCu on Vulcan carbon (PdCu/VC) also synthesized in the same procedure and characterized thoroughly. The electrochemical evaluations of the PdCu/CNT reveal the better mass activity of 1021.6 mA mg[pd]−1 which is 1.6‐fold higher than PdCu/VC and 5.9 times advanced than commercial Pd/C catalysts towards methanol electrooxidation. Also, for electrooxidation of ethylene glycol, the mass activity of the PdCu/CNT is more of about 1219.8 mA mg[pd]−1 which is around 1.7 times enhanced than PdCu/VC and 4.1 times improved than commercial Pd/C catalysts. Furthermore, sonochemically prepared PdCu/CNT provides improved stability up to 3600s in both methanol and ethylene glycol oxidation reactions. The accredited activity enhancement due to its unique construction of zero‐dimensional structured PdCu nanoalloy with one‐dimensional CNTs and modified electronic effect of Pd on it.

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Biomass‐Derived 3D Carbon Aerogel with Carbon Shell‐Confined Binary Metallic Nanoparticles in CNTs as an Efficient Electrocatalyst for Microfluidic Direct Ethylene Glycol Fuel Cells

kumar

Manthiram

2019

Advanced Energy Materials

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as biological renewability, low toxicity, and easy storability. [5] Despite the recent improvements in DEGFCs, the technology is still hindered by the problems of conventional platinum (Pt) anode catalysts, such as surface poisoning, high cost, and scarcity. [6] Recently, palladium (Pd) nanostructures have emerged as a promising EG oxidation catalyst in alkaline media, eliminating the necessity of the Pt nanocatalyst for EG oxidation. [7] However, Pd nanocatalysts are prone to rapid deterioration under surface poisoning and instability. [8] The formation of bimetals with non-precious transition metals (PdM, M = Ni, Co, Fe, Cu, Mo, Sn, etc.) is an efficient strategy to improve the stability without sacrificing the catalytic activity. [9] The oxophilic nickel (Ni) is recognized as a naturally abundant metal with enhanced corrosion resistance. [10] The inclusion of Ni into the crystal lattice of Pd facilitates active sites for -OH adsorption (OH ads ) and weakens their interaction with reaction intermediates adsorbed onto the Pd surface. [10,11] In parallel, metal nanoparticles decorated on carbon supports have also been shown to improve EG oxidation via their high electrical conductivity and catalytic activity. [12] The 3D porous structure of carbon nanotubes (CNTs) could considerably control the aggregation or stacking of the adjacent subunits, facilitating a uniform distribution of metal nanoparticles and increasing the number of accessible reactive sites for catalytic surface reactions. [13] However, the conventional strategy used for the fabrication of metal nanoparticles anchored onto CNTs involves strenuous multistep procedures, and the acidification process involved distorts the interconnected conduction channels, which consequently limits the EG oxidation kinetics. [14] Hence, the development of catalytically active metal nanoparticles encased within the graphitic layers of CNTs is highly desirable. [15] The mass transfer capability and catalytic activity of carbon nanostructures could be further improved with the development of porosity and heteroatom doping into the carbon skeleton. [16] Recently, 3D carbon aerogels (CAs) have grasped prevailing research attention as free-standing electrodes for diverse energy applications owing to their large specific surface area, low density, interconnected fibrous structure, and rapid charge transport pathways. [17,18] In this context, Pd nanoparticles Flexible and 3D carbon aerogels (CAs) composed of carbon nanotubes (CNTs) with carbon shell-confined binary palladium-nickel (Pd x -Ni y ) nanocatalysts on carbon fibers (Pd x -Ni y /NSCNT/CA) have been developed through a facile chemical vapor deposition method. The 3D porous carbon network and the synergistic effect of carbon shell-confined bimetal nanoparticles of rationally constructed aerogels facilitate enhanced electrocatalytic and antipoisoning activities toward ethylene glycol (EG) oxidation reaction compared to the commercial Pt/C catalyst. With the 3D morphological features and direct growth of Pd-Ni bimet...

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Tunable compositions of Pd_100−xCu_x catalysts towards the electrooxidation of ethanol and ethylene glycol

Abstract: Tunable compositions of Pd100−xCux towards the electrooxidation of ethanol and ethylene glycol have been examined. The Pd70Cu30 exhibited the highest activity and stability.

Cited by 13 publications

References 52 publications

Engineering Heterostructured Pd–Bi₂Te₃ Doughnut/Pd Hollow Nanospheres for Ethylene Glycol Electrooxidation

Engineering Heterostructured Pd–Bi₂Te₃ Doughnut/Pd Hollow Nanospheres for Ethylene Glycol Electrooxidation

Palladium/Copper Nanoalloy Supported on Carbon Nanotubes for the Electrooxidation of Methanol and Ethylene Glycol

Biomass‐Derived 3D Carbon Aerogel with Carbon Shell‐Confined Binary Metallic Nanoparticles in CNTs as an Efficient Electrocatalyst for Microfluidic Direct Ethylene Glycol Fuel Cells

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Tunable compositions of Pd100−xCux catalysts towards the electrooxidation of ethanol and ethylene glycol

Abstract: Tunable compositions of Pd100−xCux towards the electrooxidation of ethanol and ethylene glycol have been examined. The Pd70Cu30 exhibited the highest activity and stability.

Cited by 13 publications

References 52 publications

Engineering Heterostructured Pd–Bi2Te3 Doughnut/Pd Hollow Nanospheres for Ethylene Glycol Electrooxidation

Engineering Heterostructured Pd–Bi2Te3 Doughnut/Pd Hollow Nanospheres for Ethylene Glycol Electrooxidation

Palladium/Copper Nanoalloy Supported on Carbon Nanotubes for the Electrooxidation of Methanol and Ethylene Glycol

Biomass‐Derived 3D Carbon Aerogel with Carbon Shell‐Confined Binary Metallic Nanoparticles in CNTs as an Efficient Electrocatalyst for Microfluidic Direct Ethylene Glycol Fuel Cells

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Tunable compositions of Pd_100−xCu_x catalysts towards the electrooxidation of ethanol and ethylene glycol

Engineering Heterostructured Pd–Bi₂Te₃ Doughnut/Pd Hollow Nanospheres for Ethylene Glycol Electrooxidation

Engineering Heterostructured Pd–Bi₂Te₃ Doughnut/Pd Hollow Nanospheres for Ethylene Glycol Electrooxidation