Low-Cost and Scalable Electrodes for Anodic Production of Hydrogen Peroxide Via 2e- Water Oxidation
At a Glance
Section titled āAt a Glanceā| Metadata | Details |
|---|---|
| Publication Date | 2023-12-22 |
| Journal | ECS Meeting Abstracts |
| Authors | Dhananjai Pangotra, Luciana Vieira, Arne Roth |
| Institutions | Fraunhofer Institute for Interfacial Engineering and Biotechnology |
Abstract
Section titled āAbstractāHydrogen peroxide (H 2 O 2 ) is a crucial chemical that is widely utilized in various industrial processes. The conventional anthraquinone process for H 2 O 2 production has limitations in terms of energy consumption, high costs, and waste generation [1]. An alternative, greener and more sustainable approach is the electrochemical production of H 2 O 2 from oxygen and water using renewable energy. Our research group has been extensively investigating the two electron (2e - ) water oxidation reaction (WOR) for production of H 2 O 2 using various electrode materials, including metal oxides, commercial carbon materials, and boron-doped diamond (BDD) [2, 3]. We also investigated the role of carbonate ions (HCO 3 - and CO 3 2- ) in the process of water oxidation to H 2 O 2 . The enhancing effect e of CO 3 2- ions on anodic H 2 O 2 production was studied in a continuous flow reactor, where the optimal flow rate, process configuration and cell design, and chemical stabilizer were determined. Among other parameters, chemical composition and pH regime of the electrolyte were found to be crucial. Recently, we explored the use of graphite bipolar plates (BPP) as a low-cost alternative to BDD electrodes for anodic H 2 O 2 generation [4]. Three different commercial BPPs with varying fluoropolymer content were examined, and a correlation was found between fluoropolymer content and H 2 O 2 generation. In that study we found that a BPP sample with high fluoropolymer content resulted in a stable H 2 O 2 production for up to 100 hours at a current density of 200 mA cm -2 , with a constant faradaic efficiency of 40%. The results demonstrate that low-cost commercial carbon electrode materials can selectively oxidize water to H 2 O 2 , enabling economically viable technical applications of anodic H 2 O 2 production. References [1] S.C. Perry, D. Pangotra, L. Vieira, L.-I. Csepei, V. Sieber, L. Wang, C. Ponce de LeĆ³n, F.C. Walsh, Electrochemical synthesis of hydrogen peroxide from water and oxygen, Nature Reviews Chemistry, 3 (2019) 442-458. [2] D. Pangotra, L.-I. Csepei, A. Roth, C. Ponce de LeĆ³n, V. Sieber, L. Vieira, Anodic production of hydrogen peroxide using commercial carbon materials, Applied Catalysis B: Environmental, 303 (2022) 120848. [3] D. Pangotra, L.-I. Csepei, A. Roth, V. Sieber, L. Vieira, Anodic generation of hydrogen peroxide in continuous flow, Green Chemistry, 24 (2022) 7931-7940. [4] D. Pangotra, A. Roth, V. Sieber, L. Vieira, Electrochemical Water Oxidation to Hydrogen Peroxide on Bipolar Plates, ACS Sustainable Chemistry & Engineering, 11 (2023) 2680-2685.