Synergistic Effect of Ta₂O₅/F-C Composites for Effective Electrosynthesis of Hydrogen Peroxide from O₂ Reduction

【摘要】 The electrosynthesis of H₂O₂ as an environmentally friendly green process has attracted great attention due to the importance of H₂O₂ in industry and human lives.In this work,a new strategy was proposed to improve the electrical conductivity and H₂O₂ selectivity of transition metal oxides catalysts.F-C（F doped carbon）was coupled with Ta₂O₅ by calcining polyvinylidene fluoride（PVDF） as the carbon source using one step method.The Ta₂O₅/F-C composite catalysts show an excellent H₂O₂ selectivity of more than 80% as well as high reactivity at2.52 mA/cm²,which is greatly enhanced compared to the counterparts of F-C（selectivity of 59%） and Ta₂O₅-800（current density of 0.85 mA/cm²） in 0.1 M KOH solution.The onset potential for H₂O₂ production on Ta₂O₅/F-C composites is 0.78 V in 0.1 M KOH,which indicates a negligible overpotential.In addition,H₂O₂ selectivity of the catalyst can be stabilized at more than 80% after 10 hours of electrolysis in alkaline electrolyte.The high performance due to the introduction of F-C increases the conductivity of Ta₂O₅ and the synergistic effect between F-C and Ta₂O₅.This work proposed an efficient synergistic effect among F-doped C and Ta₂O₅ for H₂O₂ production.更多还原

【Abstract】 The electrosynthesis of H₂O₂ as an environmentally friendly green process has attracted great attention due to the importance of H₂O₂ in industry and human lives.In this work,a new strategy was proposed to improve the electrical conductivity and H₂O₂ selectivity of transition metal oxides catalysts.F-C（F doped carbon）was coupled with Ta₂O₅ by calcining polyvinylidene fluoride（PVDF） as the carbon source using one step method.The Ta₂O₅/F-C composite catalysts show an excellent H₂O₂ selectivity of more than 80% as well as high reactivity at2.52 mA/cm²,which is greatly enhanced compared to the counterparts of F-C（selectivity of 59%） and Ta₂O₅-800（current density of 0.85 mA/cm²） in 0.1 M KOH solution.The onset potential for H₂O₂ production on Ta₂O₅/F-C composites is 0.78 V in 0.1 M KOH,which indicates a negligible overpotential.In addition,H₂O₂ selectivity of the catalyst can be stabilized at more than 80% after 10 hours of electrolysis in alkaline electrolyte.The high performance due to the introduction of F-C increases the conductivity of Ta₂O₅ and the synergistic effect between F-C and Ta₂O₅.This work proposed an efficient synergistic effect among F-doped C and Ta₂O₅ for H₂O₂ production.更多还原