Significantly improved and synergistic effect of Pt–ZnO–Bi2O3 ternary hetero-junctions toward anode-catalytic oxidation of methanol in alkali

Synthesis of Different Pt‐ZnO Binary Composites for Synergistic Photo‐Electrocatalytic Oxidation of Methanol in Alkali

“…The PXRD along with their Rietveld refined patterns of synthesized catalysts is done (as per our previous work [30] ) and exhibited in Figure 1.…”

“…Numerous CV cycles were executed in the potential range of À 0.9 V to + 0.6 V with scan rate range 1 mVs À 1 to 300 mVs À 1 . [30,40,41] The 30 W LED bulb (wavelength > 400 nm) of intensity ca 90 x 100 lx (measured by digital lux meter, LX-101 A) was exploited as the light source in every part of photo-electrochemical measurements. The electrochemical performance of as synthesized electrode-materials depends upon the electrochemical active specific surface area (ECSA)s of platinum in different PZ binary composites.…”

“…The ECSA of synthesized electrodes were determined by computing the coulombic charge associated with oxygen desorption by measuring the charge of reduction of PtO after rectifying the double-layer charging effect in the region between À 0.21 V to À 0.65 V vs SCE from cyclic voltammogram (CV) of each test electrode dissolved in 0.5 M NaOH solution (Figure 4a) at scan rate 50 mVs À 1 . [30,33] The following equation is used:…”

“…Figure 5a times greater than PZ01 electrode suggesting the more efficient interfacial charge transfer in the photo illuminated process. [34] The equilibrium potential of oxidation of CH 3 OH to CO 3 2À by regarding pH effect and potential shift between SCE and NHE in 1 M NaOH, E e value is calculated and set as À 1.0986 V. [30,47] The tafel plots of all synthesized electrodes in absence and presence of light are shown in Figures S4a and b. Tafel slope, intercept and equilibrium exchange current density of all prepared PZ composites are encapsulated in Table S3.…”

“…It shows that the retention tenures at 3.34, 3.82, 4.93, 6.67 and 9.92 min correspond to oxalic acid, methyl formate, formaldehyde, carbonate and formate respectively were detected as MOR products. [30,47,53] To confirm the formation of above compounds HPLC of blank solutions were carried out. The retention time around 10.33, 6.62, 4.30, 3.89 and 3.38 min in the profiles correspond to the standard substance (as identified from the peaks of known pure compounds) of HCOONa, Na 2 CO 3 , HCHO, HCOOCH 3 and C 2 H 2 O 4 respectively as illustrated in Figure S5.…”