Electrogeneration of hydrogen peroxide in gas diffusion electrodes modified with tert-butyl-anthraquinone on carbon black support
Electrogeneration of hydrogen peroxide in gas diffusion electrodes modified with tert-butyl-anthraquinone on carbon black support
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DOI：
10.1016/j.carbon.2013.04.100
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发表时间：
2013-09-01
期刊：
影响因子：
10.9
通讯作者：
Lanza, Marcos R. V.
中科院分区：
文献类型：
--
作者：
Valim, Ricardo B.;Reis, Rafael M.;Lanza, Marcos R. V.
过氧化氢（H2 O2）是一种多用途的氧化剂，它是通过在有机介质中还原氧气而商业合成的。采用改性气体扩散电极（MGDE）的电化学技术为氧化剂的工业规模合成提供了一种可行的替代方案。添加1%（w/w）的叔丁基蒽醌（TBAQ）到以微孔层的形式沉积到旋转环盘电极的盘上的炭黑中产生环电流的增加，这与H2 O2的形成直接相关，并且与单独的炭黑的76.6%相比，H2 O2的产生效率为89.6%。没有显着的变化被检测到在催化剂的存在下转移的电子的数量，表明电化学/化学机制H2 O2的形成。用在炭黑上包含TBAQ的MGDE获得了H2 O2产生的类似改进。当电位为-1.0 V vs SCE时，以最快的速率（5.9 mg L-1 min（-1））和最低的能耗（6.0 kWh kg（-1））产生最高浓度的H2 O2（301 mg L-1）。得出的结论是，在H2 O2的电生成中，在炭黑载体上包括TBAQ的MGDE的应用提供了相当大的优势。(C)2013爱思唯尔有限公司保留所有权利。
Hydrogen peroxide (H2O2) is a versatile oxidizing agent that is synthesized commercially by the reduction of oxygen in organic medium. Electrochemical technology employing a modified gas diffusion electrode (MGDE) offers a viable alternative for the industrial-scale synthesis of the oxidant. Addition of 1% (w/w) of tert-butyl-anthraquinone (TBAQ) to carbon black deposited in the form of a microporous layer onto the disk of a rotating ring-disk electrode produced an increase in the ring current, which is directly related to H2O2 formation, and presented an efficiency of H2O2 generation of 89.6% compared with 76.6% for carbon black alone. No significant changes were detected in the number of electrons transferred in the presence of the catalyst suggesting an electrochemical/chemical mechanism for H2O2 formation. Analogous improvements in the generation of H2O2 were obtained with MGDEs comprising TBAQ on carbon black. The highest concentrations Of H2O2 (301 mg L-1) were produced at the fastest rate (5.9 mg L-1 min(-1)) with the lowest energy consumption (6.0 kWh kg(-1)) when a potential of -1.0 V vs SCE was applied to a MGDE containing 1.0% of TBAQ on carbon black. It is concluded that the application of MGDEs comprising TBAQ on carbon black support offers considerable advantages in the electrogeneration of H2O2. (C) 2013 Elsevier Ltd. All rights reserved.