Ultra-rapid chemical synthesis of mesoporous Bi2O3 micro-sponge-balls for supercapattery applications

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

“…, ( 211), ( 220), ( 212), ( 410), ( 411), (203) planes, respectively. 8,[27][28][29] This set of results by PXRD fully supports the successful design of a synthesis methodology to engineer different types of micro-and nano-structured bismuth-based materials with different shape, composition and crystallinity. Those characteristics will undoubtedly be a powerful tool to control the electrocatalytic selectivity towards the oxygen reduction to hydrogen peroxide.…”

“…species. [27][28][29][30][70][71][72] It was reported that the pre-peak corresponds to a small fraction of Bi metal sites located near the bismuth-metal/micropore-solution interface while the main and the plateau are related to the oxidation of bismuth metal to bismuth (III). 70 During the reverse scan, the main cathodic peak corresponds to the reduction of the previously formed bismuth (III) to bismuth metal, which is considered to be composed of several steps and where the intermediate species BiO2 2− was used to explain to the presence of at least one cathodic peak.…”

“…10,11 Belonging to the semimetal group, the small overlap between the bottom of the conduction band and the top of the valence band provides interesting physicochemical and catalytic properties to bismuth. [12][13][14][15] For instance, bismuth-based composites gained a signification interest as active materials for the photo-/electrocatalytic synthesis of valuable chemicals (production of hydrogen peroxide, 16 ammonia 17 , formate 18,19 , hydrogen 15,20,21 ), the control of the catalytic selectivity, [22][23][24][25] the sensing, 26 and energy conversion [27][28][29][30] applications.…”

Facile Chemical Synthesis and Potential Supercapattery Energy Storage Application of Hydrangea-type Bi2MoO6

“…The EIS (Figure 3f) plot was more vertical in the high-frequency and low-frequency ranges, suggesting the presence of capacitive- and battery-type contributions. In short, from the Nyquist plot, the supercapattery nature of Bi 2 MoO 6 46 is corroborated. The 0.67 Ω semi-circular diameter in the higher frequency region, which is a charge-transfer resistance, was considerably smaller, revealing the existence of fast transfer of electrolyte ions across the electrolyte/electrode interface.…”

“…For Bi 2 MoO 6 , a single reduction peak (R1) with high current intensity could be due to the reduction of Bi 3+ to Bi 0 (−0.82 V), and, on the other hand, the two anodic peaks (O1 and O2) found at −0.48 and −0.30 V accounted for the oxidation of Bi 0 to Bi metal and the oxidation of Bi metal to Bi 3+ , respectively. The possible oxidation and reduction processes taking place during the redox reaction 40,46,47 could be as followsOxidation peaks at “O1” and “O2” were attributed to the presence of a minor amount of Bi metal situated at the Bi metal/electrolyte interface, and the oxidation peak O2 along with the voltage plateau indicated the oxidation of Bi metal to Bi(III) 48 as followsThe above equations support the occurrence of the quasi-Faradaic signature, where with an increase in scan rate the oxidation peak potential shifts to a more positive direction and the reduction peak potential to the negative direction. 43,49 Well-defined redox peaks in the CV profile are obtained only for Bi 2 O 3 , as it was found earlier that the molybdenum (Mo) element in Bi 2 MoO 6 cannot participate in redox reactions.…”