Synthesis of hydrogen peroxide in microbial fuel cell

Abstract

BACKGROUND: Hydrogen peroxide (H 2 O 2 ) is an important chemical product, and this study investigated its synthesis at the cathode of a microbial fuel cell (MFC) system using spectrographically pure graphite (SPG) rods as cathode electrode.

Manganese–polypyrrole–carbon nanotube, a new oxygen reduction catalyst for air-cathode microbial fuel cells

“…Electrons migrate through the external circuit to cathode where electron acceptors get reduced by accepting electrons, and meanwhile protons migrate in the internal circuit across the separator to complete a whole circuit [1]. The unique property of MFC shows great promise in harvesting energy from waste material [2], bioremediation for pollutant control [3,4], desalination for fresh water generation [5,6], chemical production [7,8] and also application as sensing systems [9]. Nevertheless, there still remain many challenges such as improving the power output, scaling up, and lowering the capital cost [10].…”

Prussian blue/graphene-modified electrode used as a novel oxygen reduction cathode in microbial fuel cell

“…Oxygen molecule is the most suitable electron acceptor because of its low-cost, high oxidation potential, availability, sustainability, and green product to environment [1,13]. Depending on the electrode material and its surface properties as well as the solution pH, oxygen can be catalytically reduced to hydrogen peroxide or water [13][14][15]. In order to obtain more electric energy, the 4-electron reduction process of oxygen producing H 2 O is perfect.…”

“…But ferricyanide should be regularly replenished for its depletion and diffusion to anode chamber through proton-exchange membrane, which are of potential toxicity to environment and degradation of the MFC performance. Oxygen molecule is the most suitable electron acceptor because of its low-cost, high oxidation potential, availability, sustainability, and green product to environment [1,13]. Depending on the electrode material and its surface properties as well as the solution pH, oxygen can be catalytically reduced to hydrogen peroxide or water [13][14][15].…”

Desenvolvimento e avaliação de eletrodos de difusão gasosa (EDG) para geração de H2O2 in situ e sua aplicação na degradação do corante reativo azul 19

“…8 O sinergismo dos processos anódicos 9 com a produção catódica in situ de espécies oxidantes como, por exemplo, o peróxido de hidrogênio, pode permitir ainda a utilização da reação de Fenton para controle de diversos tipos de contaminações. [10][11][12][13] O peróxido de hidrogênio pode ser obtido por diversas técnicas, como síntese química em fase gasosa ou em fase aquosa catalisada, [14][15][16][17][18][19] porém se observam diversas limitações nesses processos, como a necessidade de remoção do catalisador utilizado. Diante dessas limitações, as técnicas eletroquímicas se mostram versáteis na geração de H 2 O 2 , diminuindo ou evitando a formação de subprodutos diante do sobrepotencial aplicado e utilizando, quando necessário, catalisadores imobilizados na estrutura dos eletrodos, não sendo necessária a remoção do catalisador do meio reacional.…”