α(β)-PbO₂ doped with Co₃O₄ and CNT porous composite materials with enhanced electrocatalytic activity for zinc electrowinning

Abstract

3D-Ti/PbO2–Co3O4–CNTs composite electrode was fabricated through galvanostatic electrodepositon, which shows outstanding electrocatalytic activity to OER in harsh media (50 g L−1 Zn2+ + 150 g L−1 H2SO4).

Micro-area investigation on electrochemical performance improvement with Co and Mn doping in PbO2 electrode materials

“…Ag/AgCl/3 mol L À1 KCl serves as the reference electrode; Pt wire serves as an auxiliary electrode. 10 mmol L À1 K 3 [Fe(CN) 6 ] solution was used as the redox medium, 0.1 mol L À1 KCl solution was used as the supporting electrolyte, and the probe voltage was 0.05 V vs. Ag/AgCl to control the probe tip reaction, as shown in reaction 1 to reduce K 3 (1)…”

“…Despite the virtues mentioned above, there is huge room for improvement in terms of the electrochemical reactivity of the PbO 2 electrode. Researchers have modied and rened PbO 2 electrodes by inserting ions, 1,2 doping with active and inert particles, 3,4 and changing the structure of PbO 2 . [5][6][7] As a result, the electrochemical reactivity of the PbO 2 electrode is enhanced and the application range of the PbO 2 electrode is expanded.…”

PbO2 modified with TiO2-NTs composite materials with enhanced OER electrocatalytic activity for Zn electrowinning

“…Titanium-based coating insoluble anode possesses stable dimensions, high corrosion resistance and long service life, which have attracted attention from research 11 and it has been widely used in hydrometallurgy, electrolytic wastewater, chloralkali industry and other elds. [12][13][14][15] PbO 2 is one of the best options for active coatings due to its low price, high conductivity and excellent corrosion resistance in acid solution. [16][17][18] However, its shortcoming, such as poor adhesion, large interface resistance and low electrocatalytic activity cannot be ignored.…”

“…19,20 To our best knowledge, Sn, Sb oxide, a-PbO 2 and other conductive layers can usually serve as intermediate layers to prolong service life and enhance OER performance. 13,20,21 Besides, the active PbO 2 coating doped with foreign elements or active particles, such as Bi, 22 Ag, 11 RE, 18 SiO 2 , 23 ZrO 2 , 24 Co 3 O 4 , 14 MnO 2 , 25 and carbon nanotubes(CNTs) 22 can increase its electrocatalytic activity and corrosion resistance.…”