Yonis Fornazier Filho, Ana Caroliny Carvalho da Cruz, Rolando Pedicini, José Ricardo Cezar Salgado, Priscilla Paiva Luz, Josimar Ribeiro
{"title":"Development of palladium catalysts modified by ruthenium and molybdenum as anode in direct ethanol fuel cell","authors":"Yonis Fornazier Filho, Ana Caroliny Carvalho da Cruz, Rolando Pedicini, José Ricardo Cezar Salgado, Priscilla Paiva Luz, Josimar Ribeiro","doi":"10.1007/s40243-020-00187-1","DOIUrl":null,"url":null,"abstract":"<p>Physical and electrochemical properties of Pd catalysts combined with Ru and Mo on carbon support were investigated. To this end, Pd, Pd<sub>1.3</sub>Ru<sub>1.0</sub>, Pd<sub>3.2</sub>Ru<sub>1.3</sub>Mo<sub>1.0</sub> and Pd<sub>1.5</sub>Ru<sub>0.8</sub>Mo<sub>1.0</sub> 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 Pd<sub>3.2</sub>Ru<sub>1.3</sub>Mo<sub>1.0</sub>/C and Pd<sub>1.5</sub>Ru<sub>0.8</sub>Mo<sub>1.0</sub>/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 RuO<sub>2</sub> for the Pd/C and the Pd<sub>1.3</sub>Ru<sub>1.0</sub>/C catalysts, respectively, a fact not observed for the Pd<sub>3.2</sub>Ru<sub>1.3</sub> Mo<sub>1.0</sub> /C and the Pd<sub>1.5</sub>Ru<sub>0.8</sub>Mo<sub>1.0</sub>/C catalysts. The catalytic activities were tested for the ethanol oxidation in alkaline medium. Cyclic voltammetry (CV) shows Pd<sub>1.3</sub>Ru<sub>1.0</sub>/C exhibiting the highest peak of current density, followed by Pd<sub>3.2</sub>Ru<sub>1.3</sub>Mo<sub>1.0</sub>/C, Pd<sub>1.5</sub>Ru<sub>0.8</sub>Mo<sub>1.0</sub>/C and Pd/C. From, chronoamperometry (CA), it is possible to observe the lowest rate of poisoning for the Pd<sub>1.3</sub>Ru<sub>1.0</sub>/C, followed by Pd<sub>3.2</sub>Ru<sub>1.3</sub>Mo<sub>1.0</sub>/C, Pd<sub>1.5</sub>Ru<sub>0.8</sub>Mo<sub>1.0</sub>/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 RuO<sub>2</sub> activated the bifunctional mechanism and improved the catalytic activity in the Pd<sub>1.3</sub>Ru<sub>1.0</sub>/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.</p>","PeriodicalId":692,"journal":{"name":"Materials for Renewable and Sustainable Energy","volume":"10 1","pages":""},"PeriodicalIF":3.6000,"publicationDate":"2021-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1007/s40243-020-00187-1","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials for Renewable and Sustainable Energy","FirstCategoryId":"1085","ListUrlMain":"https://link.springer.com/article/10.1007/s40243-020-00187-1","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 5
Abstract
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.
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Energy is the single most valuable resource for human activity and the basis for all human progress. Materials play a key role in enabling technologies that can offer promising solutions to achieve renewable and sustainable energy pathways for the future.
Materials for Renewable and Sustainable Energy has been established to be the world''s foremost interdisciplinary forum for publication of research on all aspects of the study of materials for the deployment of renewable and sustainable energy technologies. The journal covers experimental and theoretical aspects of materials and prototype devices for sustainable energy conversion, storage, and saving, together with materials needed for renewable fuel production. It publishes reviews, original research articles, rapid communications, and perspectives. All manuscripts are peer-reviewed for scientific quality.
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1. MATERIALS for renewable energy storage and conversion: Batteries, Supercapacitors, Fuel cells, Hydrogen storage, and Photovoltaics and solar cells.
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