Preparation and Electrocatalytic Performance of Three-Dimensional Porous Structure PbO₂Electrodes Using Oxygen Bubble as Dynamic Templates

Abstract

The three-dimensional porous structure PbO 2 electrodes (3D-PbO 2 ) were successfully prepared in the lead nitrate solution by potentiostatically electrodeposition methods using oxygen bubbles as dynamic template. The morphology and structure of 3D-PbO 2 electrodes were investigated by scanning electronic microscopy (SEM) and X-ray diffraction (XRD). Compared with the traditional PbO 2 electrodes (Flat-PbO 2 ), 3D-PbO 2 electrodes possess the three-dimensional porous structure and finer grain size. The electrochemical properties of 3D-PbO 2 electrodes were investigated by linear sweep voltammetry (LSV), cyclic voltammetry (CV) and electrochemical impedance spectrum (EIS). The 3D-PbO 2 electrodes show larger electrochemical active surface area, lower charge transfer resistance and higher oxygen evolution overpotential than Flat-PbO 2 electrodes. In the electrocatalytic degradation process of malachite green, the degradation rate constant of 3D-PbO 2 electrodes (0.05189 min −1 ) was 5.8 times than that of Flat-PbO 2 electrodes (0.00889 min −1 ).

Programmable Exposure of Pt Active Facets for Efficient Oxygen Reduction

“…Motivated by the DHBT-directed synthesis of macroporous metal PFs,w ep ropose an ew concept of using oxygen (O 2 )b ubbles as gaseous templates to fabricate nanoporous metal PFs,w hich could be achieved through controlling oxygen evolution reaction (OER) during electrochemical anodization process.T he rationale behind this concept stems from the fact that the O 2 bubbles generated by OER are tiny and can be better controlled, which is due to the sluggish four-electron transfer kinetics and large overpotential as compared to the H 2 bubbles used in DHBT-directed synthesis. [16] Hence,w es uggest that the metal PFs with uniformly distributed nanoporous structure can be obtained with the help of the easily-controlled dynamic oxygen-bubble template (DOBT).…”

Fabrication and Enhanced Electrocatalytic Activity of Three-Dimensional Sphere-Stacking PbO2Coatings Based on TiO2Nanotube Arrays Substrate for the Electrochemical Oxidation of Organic Pollutants

“…The reason is that the three-dimensional porous structure changes the preferred orientation of PbO 2 . 29 Further investigating the XRD patterns, by comparison with curve c and curve b, it can be seen distinctly that 3D-sphere PbO 2 diffraction peaks broadened, indicating their weak intensities. According to the literature, 30 the half width of the diffraction peaks increase and the intensity of these peaks decrease, which implies the reduced crystalline size.…”

“…7 that the semicircle diameter for 3D-sphere PbO 2 electrode was smaller than that of flat-PbO 2 electrode, which suggested a faster charge-transfer of 3D-sphere PbO 2 electrode in process of degradation. 29 To further analyze the interfacial details of the two electrodes, the equivalent circuit model (insert in Fig. 7) was applied in the simulation of EIS data.…”

Fabrication and characterization of titanium‐based lead dioxide electrode by electrochemical deposition with Ti4O7 particles

“…Further improvement is consequently required to promote the electrode performance. At present, alternative modification methods reported prevalently include surface modification, introduction of intermediate layer (Jia et al, 2019), selection of new preparation methods (Elaissaoui et al, 2019), matrix modification (Liu et al, 2018;Yao, Huang, Yang, Li, & Ren, 2018;Yingwu, Xin, Naichuan, Haishu, & Haoren, 2017), etc. Surface modification, using metal ions (Hao, Dan, Qian, Honghui, & Wei, 2014), F ions, surfactants (Hao et al, 2016;Xiaoyue, Feng, Yinan, Yawen, & Limin, 2018), and particles (Xie et al, 2017), is relatively more investigated among such many modification methods.…”