ZnO As an Active and Selective Catalyst for Electrochemical Water Oxidation to Hydrogen Peroxide

Abstract

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Efficient H2O2 Production via H2O Oxidation on an Anode Modified with Sb‐Containing Mixed Metal Oxides

“…In previous works, the number of electrocatalysts for the efficient generation of H 2 O 2 from H 2 O was limited. In particular, catalysts reportedly able to suppress O 2 production via the four‐electron oxidation of H 2 O include BiVO 4 , CaSnO 3 , [17 ] and ZnO . On the other hand, only one electrocatalyst has been reported to suppress H 2 O 2 decomposition: Al 2 O 3 .…”

“…Based on these results, we were able to prove the potential of performing FTO electrode with mixed metal oxide modification as an approach to realizing the efficient production of H 2 O 2 from H 2 O. However, in an electrolyte containing bicarbonate ion, the BiVO 4 layer on the FTO electrode included stability problems, and, what is worse, the alternative mixed metal oxide materials to BiVO 4 were very limited …”

Prospects of Value‐Added Chemicals and Hydrogen via Electrolysis

“…Similarly, recent studies report that tailoring surface facets has a beneficial impact on the water electrooxidation performance of ZnO‐based electrocatalysts . Herein, synthesized ZnO nanoparticles showed a low overpotential of 0.04 V at a current density of 0.1 mA cm −2 .…”

Industrial feasibility of anodic hydrogen peroxide production through photoelectrochemical water splitting: a techno-economic analysis

“…23 In recent years, the interest in electrochemical H 2 O 2 formation has been rekindled, where selective water oxidation has been reported both by theory and experiments. 18,[24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] For example, MnO x was demonstrated to work as an anode for selective water oxidation to H 2 O 2 . 31 Although further material development is still required, in more recent studies metal oxides such as WO 3 and BiVO 4 seem to be excellent electrode materials, providing high selectivities for selective water oxidation to H 2 O 2 at reasonable overpotentials (roughly 200 and 350 mV respectively).…”

“…63% up to 98% at additional potentials of 1.5 and 1.9 V vs. RHE respectively under (simulated) solar illumination. 29 Moreover, Gd:BiVO 4 , 38 surface phosphate-treated Mo:BiVO 4 , 39 ZnO, 40 CaSnO 3 41 germanium porphyrins 42 and aluminum porphyrins 43 have been shown recently to be interesting materials for selective water oxidation to H 2 O 2 as well. Lastly the inclusion of a protective layer such as mesoporous and amorphous Al 2 O 3 could prevent anodic H 2 O 2 degradation to O 2 , thus enhancing selectivity.…”