In situ electrosynthesis of hydrogen peroxide with an improved gas diffusion cathode by rolling carbon black and PTFE
In situ electrosynthesis of hydrogen peroxide with an improved gas diffusion cathode by rolling carbon black and PTFE
复制标题
通过滚动炭黑和 PTFE 使用改进的气体扩散阴极原位电合成过氧化氢
DOI：
10.1039/c5ra09636g
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发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Dong, Xiaoqing
中科院分区：
文献类型：
--
作者：
Luo, Haijian;Li, Chaolin;Dong, Xiaoqing
采用炭黑和聚四氟乙烯作为导电催化剂层，构建了一种结构简单的气体扩散电极（GDE），以提高过氧化氢的生产效率。采用Box-Behnken设计（BBD）和响应面法来评估三个主要独立参数（pH、电流密度和空气流速）对H2O2浓度的单独和交互影响。方差分析（ANOVA）显示具有较高的决定值系数。最佳操作条件为pH值4.0，电流密度52 mA cm(-2)，空气流速55 mL min（-1）。在该模型确定的最优条件下，预测的H2O2浓度为309.85 mM，表明不使用贵金属和其他化学促进剂的改进GDE是一种有潜力的原位电合成H2O2的方法。结果还表明，电流密度、空气流速及其相互作用对H2O2浓度有显著影响，而初始pH的变化对H2O2浓度无明显影响。实验表明，电流密度对电解过程中的分解反应有直接影响。
A simply structured gas diffusion electrode (GDE) was constructed by rolling carbon black and PTFE as a conductive catalyst layer to enhance the producibility of hydrogen peroxide. A Box-Behnken design (BBD) coupled with response surface methodology was employed to assess the individual and interactive effects of the three main independent parameters (pH, current density and air flow rate) on the H2O2 concentration. Analysis of variance (ANOVA) showed a high coefficient of determination value. Optimal operating conditions were a pH value of 4.0, current density of 52 mA cm(-2), and an air flow rate of 55 mL min(-1). The predicted H2O2 concentration under the optimal conditions determined by the proposed model was 309.85 mM, demonstrating the improved GDE without using noble metals and other chemical promoters is a potential method for in situ electrosynthesis of H2O2. Results also revealed that the current density, air flow rate, and their interaction effect had a significant effect on the H2O2 concentration, whereas changes to the initial pH had no apparent effect. Experiments showed that current density has a direct effect on the decomposition reaction in the electrolytic process.