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

Abstract

Tartaric acid emerges as an ecofriendly organic for the biogenic preparation of micro- and nano-structured materials. For those synthesis mainly dictated by the coordination chemistry, questions remain open about the...

Boosting H2 Production from a BiVO4 Photoelectrochemical Biomass Fuel Cell by the Construction of a Bridge for Charge and Energy Transfer

“…As a typical biomass, C 4 H 6 O 6 contains rich carboxyl and hydroxyl, which is an important factor for its strong complexing and reduction ability. [28,39] To study the roles of these two functional groups in enhancing the PEC performance of the BVO photoanode, the organics that only contain hydroxyl or carboxyl groups, i.e., glycerol ( solution. These results indicate that the organic fuels containing a single hydroxyl or carboxyl functional group in the electrolyte cannot maximize the PEC performance of the BVO photoanode, and the coexistence of hydroxyl and carboxyl groups in biomass is important for guaranteeing the high PEC performance of the BVO photoanode.…”

Probing Oxygen-to-Hydrogen Peroxide Electro-Conversion at Electrocatalysts Derived from Polyaniline

“…The next question is whether all these active sites are in favor of a better hydrogen peroxide production by selective O 2 reduction. It is known that the selectivity toward hydrogen peroxide production requires O 2 molecules to be perpendicularly adsorbed by a single oxygen atom on the catalytic surface (a parallel adsorption will trigger the oxygen-oxygen bond cleavage), which can be achieved by tuning the inter-distance between active sites and the heterogeneity of the catalytic surface [ 9 , 33 , 34 , 35 ]. In the following, we will briefly explain the basics of the used electroanalytical method to track the depth of the ORR on-line.…”

“…The quantitative analysis by bulk electrolysis and UV-vis assays were described in Ref. [ 9 ]. Typically, the two compartments of a H-type cell were separated by a hydroxide anion exchange membrane and each contained 60 mL of 1 M KOH at room temperature (22 ± 2 °C).…”

“…Each solution was treated with an equivalent excess of H 2 SO 4 (at 0.34 mol per L to generate H 2 O 2 species: HO 2 − (aq) + H + (aq) → H 2 O 2 , pKa = 11.75) and potassium titanium (IV) oxalate (at 50 g per L to form a colored indicator with H 2 O 2 ). After preliminary tests in a full spectrum configuration (300–900 nm), the absorbance of the yellow pertitanic acid complex between hydrogen peroxide and potassium titanium oxalate was measured at 390 nm [ 9 , 26 , 27 , 28 , 29 ] in the kinetic configuration.…”

“…The photocatalysis that provides the required energy for the direct method by the solar power is contingent on climatic conditions, so it may not be the sole answer. The electrocatalytic [ 3 , 6 , 7 , 8 , 9 , 10 ] (or even photoelectrocatalytic [ 11 , 12 ]) pathway, the so-called Power-to-X approach, is thus seen as a promising option where electrical energy from any source (ideally renewable) would allow the intelligent and elegant production of hydrogen peroxide from naturally available reactants, either by the partial oxidation of water (2H 2 O → H 2 O 2 + 2H + + 2e − ) or the partial reduction of atmospheric oxygen (O 2 + 2H + + 2e − → H 2 O 2 ). For that, we need highly selective electrocatalysts to circumvent the four-electron pathway that reduces the faradaic efficiency (portion of the used electrical energy to make a targeted electron transfer reaction).…”