Xinyu Huo,Jinxing Gu,Baomin Luo,Fengyun Su,Yezhen Zhang,Dan Zhang,Ruili Shi,Bingxuan Qiao,Yixin Wang
Direct ethanol fuel cells (DEFCs) have received widespread attention due to their simple construction, low operating temperature, high conversion efficiency, high energy density, and being free of pollution. The sluggish kinetics, low C 1 pathway selectivity, and poor resistance to CO poisoning, however, remain great challenges for their development. In this work, porous PtBiTe nanoplates (PtBiTe NPs) with an average lateral size of 309.5 nm and an average thickness of 14.6 nm were facilely synthesized in aqueous solution at room temperature by using Bi 2 Te 3 nanoplate templates. The twodimensional porous structure exposes a large number of Pt active sites and has excellent structural stability. The introduction of Bi and Te modifies the electronic structure of Pt, weakens the energy barrier of the potential-determining step of the C 1 pathway, reduces the energy barrier of CO oxidation, and decreases the number of oxidized Pt atoms. PtBiTe NPs show excellent activity and stability, high C 1 pathway selectivity, and robust resistance to CO poisoning toward ethanol oxidation reaction in alkaline electrolyte, much superior to the commercial Pt/C catalysts.
Promoting C─C bond cleavage of ethanol to achieve a complete 12-electron pathway (C1 pathway) for ethanol oxidation reaction (EOR) is crucial for the development of highly efficient direct ethanol fuel cells. In this study, a highly porous ultrathin PdSn nanomesh (NM) with high proportion of low-coordinated edge and step sites is developed for alkaline EOR. The PdSn NM/C catalyst exhibited superior specific activity of 21.9 ± 0.9 mA cm −2 Pd with a significantly enhanced Faradaic efficiency of C1 pathway to CO 2 . In situ attenuated total reflection surface enhanced infrared absorption spectroscopy measurements demonstrated the significant enhancement of C1 selectivity on PdSn NM/C. Theoretical calculations further revealed the pivotal role of low-coordinated edge and step sites in effectively lowering the activation energy barrier for C─C bond cleavage of CH 3 CO*. This work provides a strategy for the rational design of highly efficient EOR electrocatalysts through low-coordinated site engineering.
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