Microstructural origin of selective water oxidation to hydrogen peroxide at low overpotentials: a study on Mn-alloyed TiO₂

Abstract

One key objective in electrocatalysis is to design selective catalysts, particularly in cases where the desired products require thermodynamically unfavorable pathways. Electrochemical synthesis of hydrogen peroxide (H2O2) via the two-electron...

Multicolor Bipolar Modulation of Titanium–Chromium Oxide Electrochromic Coatings

“…The first peak at ∼1.5 Å radial distance was located at the same peak position as our previous report for ALDgrown (Ti,Mn)O x , both cases corresponding to the Ti−O distance, while the second peak (at ∼2.6 Å) corresponded to the Ti−Ti distance, indicating the (Ti,Cr)O x film also contain TiO 2 nanocrystals. 35 The XAFS results were consistent with the GIXRD pattern and AFM characterizations. These results combined suggest that there was minimal long-range ordering for the ALD (Ti,Cr)O x coating, but it contains TiO 2 and CrO x nanocrystals (short-range ordering).…”

“…The modulation of optical absorption was found to be mainly due to the change in the electronic structure of (Ti,Cr)O x , which will be further discussed in Section 3.8. 35 3. anode material in an aqueous solution. As displayed in Figure 3a, when the electrode potential was held around 0.5 V vs Ag/ AgCl, the color was light yellow with 76.4% transmittance at 545 nm (Figure 3b).…”

Effect of doping TiO2 with Mn for electrocatalytic oxidation in acid and alkaline electrolytes

“…27 In particular, various manganese (Mn)-doped TiO 2 structures have been synthesized for a wide range of catalytic applications, such as nanosheets, 28 nanopowders, 29,30 nanoparticles, [31][32][33] and thin films 34 as photocatalysts, nanospheres for electrochemical N 2 reduction, 35 nanoparticles for electrochemical O 2 reduction, 36 and thin films for water oxidation. 37 Herein, we study the effect Mn atoms have on the activity and selectivity of TiO 2 for different electrochemical oxidation pathways in 0.5 M H 2 SO 4 and 2 M KHCO 3 electrolytes. We synthesized Mn-doped TiO 2 (Mn:TiO 2 ) thin films via a simple and rapid sol-gel method and verified the nature of Mn through X-ray Absorption Spectroscopy (XAS).…”

Invention as a Complement to High School Chemistry

“…The inquiry led students to read Hu’s paper titled “Membrane-Less Photoelectrochemical Devices for H 2 O 2 Production” . They learned an electrochemical cell with an uncoated titanium cathode and a titanium anode coated with Hu’s manganese-alloyed titanium oxide (Ti,Mn)­Ox catalyst , could quickly produce H 2 O 2 at a low voltage on both the anode and cathode according to the following reactions: Reading Hu’s paper empowered them to envision a POU water bottle using a version of Hu’s electrochemical cell with a small portable solar panel to provide the required power. A POU approach is “the most promising intervention strategy for producing immediate health benefits in the most vulnerable rural populations” .…”

“…The inquiry led students to read Hu's paper titled "Membrane-Less Photoelectrochemical Devices for H 2 O 2 Production". 10 They learned an electrochemical cell with an uncoated titanium cathode and a titanium anode coated with Hu's manganesealloyed titanium oxide (Ti,Mn)Ox catalyst 11,12 could quickly produce H 2 O 2 at a low voltage on both the anode and cathode according to the following reactions:…”