Preparation and electrocatalytic characteristics of the Pt-based anode catalysts for ethanol oxidation in acid and alkaline media

Tran, Lien Thi; Nguyen, Quang Minh; Nguyen, Minh Dang; Le, Hong Ngan Thi; Nguyen, Thao Thi; Vu, Thu Ha Thi

doi:10.1016/j.ijhydene.2018.09.049

Cited by 25 publications

(15 citation statements)

References 50 publications

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“…However, breaking the ethanol C-C bond is not easy and, consequently, the CO 2 formation is low, and the incomplete reaction leads to the poisoning CO [1,[3][4][5][6] To improve the performance of alcohol fuel cells, it is necessary to use efficient anodic catalysts. Among them, Pt has shown good results in the acid medium [3][4][5][6][7], but it is a noble metal, its cost is high, and its sources of production are scarce. In addition, Pt-based catalysts are easily poisoned by CO, which decreases its efficiency and leads to undesirable intermediates [3,5].…”

Section: Introductionmentioning

confidence: 99%

Development of palladium catalysts modified by ruthenium and molybdenum as anode in direct ethanol fuel cell

Filho

Cruz

Pedicini

et al. 2021

Mater Renew Sustain Energy

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Physical and electrochemical properties of Pd catalysts combined with Ru and Mo on carbon support were investigated. To this end, Pd, Pd1.3Ru1.0, Pd3.2Ru1.3Mo1.0 and Pd1.5Ru0.8Mo1.0 were synthesized on Carbon Vulcan XC72 support by the method of thermal decomposition of polymeric precursors and then physically and electrochemically characterized. The highest reaction yields are obtained for Pd3.2Ru1.3Mo1.0/C and Pd1.5Ru0.8Mo1.0/C and, as demonstrated by thermal analysis, they also show the smallest metal/carbon ratio compared the other catalysts. XRD (X-ray Diffraction) and Raman analyses show the presence of PdO and RuO2 for the Pd/C and the Pd1.3Ru1.0/C catalysts, respectively, a fact not observed for the Pd3.2Ru1.3 Mo1.0 /C and the Pd1.5Ru0.8Mo1.0/C catalysts. The catalytic activities were tested for the ethanol oxidation in alkaline medium. Cyclic voltammetry (CV) shows Pd1.3Ru1.0/C exhibiting the highest peak of current density, followed by Pd3.2Ru1.3Mo1.0/C, Pd1.5Ru0.8Mo1.0/C and Pd/C. From, chronoamperometry (CA), it is possible to observe the lowest rate of poisoning for the Pd1.3Ru1.0/C, followed by Pd3.2Ru1.3Mo1.0/C, Pd1.5Ru0.8Mo1.0/C and Pd/C. These results suggested that catalytic activity of the binary and the ternary catalysts are improved in comparison with Pd/C. The presence of RuO2 activated the bifunctional mechanism and improved the catalytic activity in the Pd1.3Ru1.0/C catalyst. The addition of Mo in the catalysts enhanced the catalytic activity by the intrinsic mechanism, suggesting a synergistic effect between metals. In summary, we suggest that it is possible to synthesize ternary PdRuMo catalysts supported on Carbon Vulcan XC72, resulting in materials with lower poisoning rates and lower costs than Pd/C. Graphic abstract

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Section: Introductionmentioning

confidence: 99%

Development of palladium catalysts modified by ruthenium and molybdenum as anode in direct ethanol fuel cell

Filho

Cruz

Pedicini

et al. 2021

Mater Renew Sustain Energy

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“…Accordingly, considerable attention has been devoted to anode catalyst development and structure engineering perspectives to develop the catalyst that possesses high electrocatalytic activity and stability with the merits of low cost. There is no doubt that platinum (Pt) has been considered as an efficient electrocatalyst for ethanol oxidation reaction but the use of platinum is quite limited due to its high cost, the paucity of noble metals, and loss of activity through poisoning by reactive intermediates [11][12][13][14][15]. Hence, to solve these problems, various Pt-based bimetallic alloys (PtRu, PtPd, and PtSn) have been used to enhance the catalytic activity and reduce the cost; on the other hand, these Pt-based bimetallic electrocatalysts seriously suffer from heavy aggregation [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Electrooxidation behavior of ethanol toward carbon microbead-encapsulated ZnO particles derived from coffee waste

Ghouri

Elsaid

Abdel‐Wahab

et al. 2020

J Mater Sci: Mater Electron

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Carbon microbead-encapsulated ZnO (CM-ZnO) particles have been synthesized from the spent coffee ground (SCG) by chemical activation with ZnCl 2 followed by calcination at 700 ℃ in N 2 environment. Interestingly, ZnCl 2 can act as an activating agent as well as a precursor for ZnO particles. The structure of the core and shell of the CM-ZnO was investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. Moreover, X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) studies confirmed the presence of the encapsulated ZnO particles. The Brunauer-Emmett-Teller (BET) and Barrett-Joyner-Halenda (BJH) plots showed a well-developed porous structure with a specific surface area of 210 m 2 /g, average pore volume of 1.12 cm 3 /g, and an average pore radius of 31.7 Å. The electrooxidation behavior of ethanol toward the synthesized CM-ZnO was then studied using cyclic voltammetry (CV) technique. For comparison, two types of modified electrodes were prepared: the first one with the non-activated SCG and the second one with the CM-ZnO. The electrochemical measurements of the prepared CM-ZnO demonstrated higher electrocatalytic activity with a current density of ~ 35 mA/cm 2 at 0.4 V vs. Ag/AgCl for ethanol electrooxidation in an alkaline medium. The electrochemical measurements specified that the presence of ZnO particles and the high surface area of the activated sample have a significant influence on electrooxidation activity. Therefore, the introduced CM-ZnO particles could be an alternative and effective non-precious electrocatalyst for ethanol electrooxidation.

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“…Specifically, PASGN.N catalysts presented the superior activity in electrooxidation of ethanol in the alkaline medium when the current density was more than 16000 mA•mg −1 Pd , which is the best results reported in this study. is value is higher than activity of Pd-based catalyst with different promoter [20,36] or activity of Pt-base catalyst [37] with the same promoter. Another result in this particle is that the electrochemical stability of PASGN.N catalyst was relatively good: after 500 scanning cycles, the current density diminished 32% compared with the highest peak current density of the 15 th cycle.…”

Section: Resultsmentioning

confidence: 80%

Enhancing Activity of Pd-Based/rGO Catalysts by Al-Si-Na Addition in Ethanol Electrooxidation in Alkaline Medium

Nguyen

Tran

Nguyen

et al. 2019

Journal of Chemistry

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The article presents modified Pd-based catalysts supported on reduced graphene oxide (rGO), used in the electrooxidation reaction of ethanol in alkaline medium. When NaBH4 reducing agent was used, the random presence of Na was found out. According to this result, Na was used as a promoter of Pd-based catalyst. Consequently, the Al-Si-Na addition not only assisted active phase Pd nanoparticles to disperse homogenously on graphene surport, but also contributed to increase catalytic activity in the reaction. This value, 16138 mA·mg−1Pd, is about 1.5 times higer than that of the catalyst modified by Al-Si. Moreover, the stability of the catalyst is enhanced more. The electrochemical stability of PASGN.N catalyst was relatively good: after 500 scanning cycles, the current density diminished 32% compared with the highest peak current density of the 15th cycle, which was chosen as a reference. These significant improvement results in electrooxidation of ethanol have opened up the high potential application of these catalysts in direct-ethanol fuel cell.

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Preparation and electrocatalytic characteristics of the Pt-based anode catalysts for ethanol oxidation in acid and alkaline media

Cited by 25 publications

References 50 publications

Development of palladium catalysts modified by ruthenium and molybdenum as anode in direct ethanol fuel cell

Development of palladium catalysts modified by ruthenium and molybdenum as anode in direct ethanol fuel cell

Electrooxidation behavior of ethanol toward carbon microbead-encapsulated ZnO particles derived from coffee waste

Enhancing Activity of Pd-Based/rGO Catalysts by Al-Si-Na Addition in Ethanol Electrooxidation in Alkaline Medium

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