Lattice oxygen of PbO₂ induces crystal facet dependent electrochemical ozone production

Abstract

The on-site production of ozone via electrochemical water electrolysis has attracted increasing interest because of its security and efficiency. However, the underlying mechanisms of the facet effect and lattice oxygen...

Porous Pb-Doped ZnO Nanobelts with Enriched Oxygen Vacancies: Preparation and Their Chemiresistive Sensing Performance

“…The two peaks at about 138.71 eV and 143.45 eV, of which the peak area ratio was approximately 4:3, were observed and assigned as Pb 4f 7/2 and Pb 4f 5/2 orbitals, respectively [23]. It exactly matches the previous report, concerning other possible valence states, such as PbO 2 and Pb 3 O 4 [24][25][26]. Meanwhile, the peak located here at about 139.56 eV is recognized as Zn 3s, presenting a high intensity because of the large atomic ratio between the Zn and Pb elements [27].…”

Lattice Oxygen of PbO2 (101) Consuming and Refilling via Electrochemical Ozone Production and H2O Dissociation

“…For the OER process, the reaction was mostly adopted to follow the four-step proton-couple electron-transfer mechanism, which was also termed the “adsorbate evolution mechanism” (AEM). In the AEM process, the reaction intermediates, including OH*, OOH*, H­(OH)­O*, H 2 O*, and O 2 *, are suggested to originate from H 2 O. − Recently, the lattice oxygen oxidation-mediated mechanism (LOM) for OER has been proposed, whereby the surface lattice oxygen acts as the active species and participated in the formation of O 2 . − Mefford and co-workers presented a series of cobaltite perovskites by substituting the Sr 2+ into La 1– x Sr x CoO 3−δ , therefore modifying the Co–O bond covalency and oxygen vacancy concentrations. The catalyst exhibited a high reactivity for the OER process, and lattice oxygen atoms were proved to participate in the reaction by ab initio modeling.…”

Tuning electrochemical water oxidation towards ozone evolution with heterojunction anode architectures

“…Briey, the oxidative deprotonation of the adsorbed H 2 O sequentially generates OH* (eqn (8)) and O* (eqn (9)), which undergoes dimerization to form O 2 * (eqn (10)). The O 2 * intermediate further combines with O* to liberate O 3 (eqn (11)), which competes with the desorption of O 2 * (OER).…”

“…To determine the minimum potential for the initial water discharge to OH* (eqn (8)) and O* (eqn ( 9)), theoretical phase diagrams of the DG for the WOR intermediates were constructed as functions of the applied potential (Fig. S18 †).…”

“…4 The electrochemical ozone evolution reaction (OZER) via the 6e-WOR exhibits several advantages over the traditional cold corona discharge (CCD) method, which is the current best method for O 3 generation, with respect to (i) no necessity of pure O 2 gas and a high voltage, (ii) simple equipment, and (iii) a high O 3 concentration achieved in the aqueous phase. 5 To date, boron-doped diamonds (BDDs), 6 PbO 2 , 7,8 and Ni-Sbdoped SnO 2 (NSS) 3,9 have been explored as OZER anodes. However, their low current efficiencies (CEs) limit practical deployment.…”