Substrate oxidation enhances the electrochemical production of hydrogen peroxide

Abstract

Graphical abstract

Employing speciation of metals to assess photo-assisted electrochemical efficiency for improving rainwater quality in Tehran, Iran

“…Their results indicated complete mineralization of these contaminants at pH 6 and pH 2 after 3 and 6 h, respectively. Also, Lim and Hoffmann (2019) represented the performance of graphite (Gr) cathode in removing bisphenol A. This electrode showed high electrochemical production of hydrogen peroxide (H 2 O 2 ) that had an important role in the oxidation process on the cathode.…”

“…So, it ensures the continuity of the reaction by consuming the hole and the photoelectron at the same time and suppressing their recombination via providing an electron donor and acceptor. It has the special features of low cost and environmental advantage (Zhou et al 2015;Qiu et al 2018;Lim and Hoffmann 2019). This process can transform the ionic species into their metallic solid form and precipitate them over the electrode surface, or convert them into less toxic dissolvable species (Bessegato et al 2015;Litter 2015;Sharififard et al 2018;Kim and Bae 2019;Changanaqui et al 2020).…”

Tartaric acid regulated the advanced synthesis of bismuth-based materials with tunable performance towards the electrocatalytic production of hydrogen peroxide

“…The samplings were firstly acidified toward pH 3.5, and the transformed H2O2 species (HO2 − (aq) + H + (aq) = H2O2, pKa = 11.75) were secondly quantified by UV-Vis assays using potassium titanium (IV) oxalate as a colored indicator. 40,[56][57][58] For that, the absorbance of the yellow pertitanic acid complex between hydrogen peroxide and potassium titanium oxalate was measured at λ = 390 nm on a JASCO V-570 UV-Vis-NIR spectrophotometer.…”

“…This control experiment confirms that the wavelength of λ = 390 nm resulting from the pertitanic acid complex between and potassium titanium oxalate can be utilized to selectively quantify any produced hydrogen peroxide as previously reported. 40,[56][57][58] Fig. 9d and Table 1s report the quantified hydrogen peroxide by the UV-Vis assays by two metrics.…”

“…For instance, photo-and electro-catalytic methods emerged in recent years as viable options to the high energy consumption anthraquinone process for the production of hydrogen peroxide, a chemical widely used in various industries. 16,[32][33][34][35][36][37][38][39][40][41] For electrocatalysts containing cost-effective non-noble metals, the alkaline medium is preferred to ensure chemical stability. Electrocatalytically, the two half-cell reactions and overall process describing the operation of an alkaline electrolyzer for the hydrogen peroxide production are resumed by Eqs.…”