Oxygen‐Deficient Ti_0.9Nb_0.1O_2‐x as an Efficient Anodic Catalyst Support for PEM Water Electrolyzer

Abstract

Herein, the low cost and efficient oxygen‐deficient Ti0.9Nb0.1O2‐x as support of IrO2 (noted as IrO2/TNO) anode catalyst for the PEM water electrolyzer is synthesized and then characterized using a series of techniques. Oxygen vacancies are introduced by hydrogenation treatment. The IrO2/TNO sample after hydrogenation (noted as IrO2/TNO−Hx, x corresponds to the hydrogenation temperature) exhibits enhanced electronic conductivity and increased surface active sites relative to that of the pristine IrO2/TNO sample. A single cell is assembled by IrO2/TNO−Hx as anode catalyst, commercial Pt/C as cathode catalytic and Nafion 117 membrane as electrolyte. At a low loading mass of IrO2, the IrO2/TNO−H750 sample shows the optimum oxygen evolution reaction (OER) activity (1.832 V at 1 A ⋅ cm−2), which is superior to that of unsupported IrO2 (1.858 eV at 1 A ⋅ cm−2), and remains stable for 100 h operating at a current density of 1 A cm−2. This work provides a rational design strategy for developing low cost and efficient anode catalysts support.

Enhanced Electrocatalytic Performance of IrOx by Employing F‐Doped TiO2 as Support towards Acidic Oxygen Evolution Reaction

“…In addition, EIS curves of the IrO x /F‐TiO 2 ‐based cell before and after the stability test were shown in Figure 4d. R Ω is the overall ohmic resistance of the cell, [24] the values before and after the stability test are 0.081 and 0.098 Ω, respectively. As a small fraction of overall components in the cell, the change of R Ω value for the F‐TiO 2 support is bound to be much smaller than 17 mΩ, again indicating its stable feature.…”

Essentials of High Performance Water Electrolyzers – From Catalyst Layer Materials to Electrode Engineering

“…The electrical conductivity of the support is an important metric toward low Ir-loading catalyst layers. Doping TiO 2 with a foreign element such as Nb, [107,108] V, [109] and W [110] can increase its electrical conductivity. Zhao et al [110] reported a promising performance of 38 wt% Ir nanoparticles loaded on W x Ti 1−x O 2 catalyst.…”

Supported Iridium‐based Oxygen Evolution Reaction Electrocatalysts ‐ Recent Developments

“…Therefore, the same approach as for tin‐oxide was applied and various dopings of the titanium dioxide were studied. [ 162 , 163 , 164 , 173 , 174 , 175 , 176 ] Doped TiO 2 support has already been studied for PEMFC application and porous and conductive materials could be obtained. [ 177 , 178 , 179 , 180 , 181 ] Following the promising results from Chen et al.…”