High electrocatalytic activity and stability of PtAg supported on rutile TiO2 for methanol oxidation

Rutile Ti0.9Ir0.1O2‐Supported Low Pt Loading: An Efficient Electrocatalyst for Ethanol Electrochemical Oxidation in Acidic Media

“…[ 43,55–57 ] The as‐prepared rutile Ti 0.9 Ir 0.1 O 2 ‐supported low Pt‐loading electrocatalyst showed that the initial current density (≈12.16 mA cm −2 ) was higher than that of the conventional carbon‐supported Pt catalyst (≈11.39 mA cm −2 ) at the fixed potential of 0.7 V. In addition, the remaining current density of the rutile Ti 0.9 Ir 0.1 O 2 ‐supported low Pt‐loading catalyst was observed around 8.12 mA cm −2 , which was ≈2.77‐fold higher than that of the conventional Pt/C electrocatalyst (≈2.93 mA cm −2 ), suggesting that the as‐obtained 15.5 wt% Pt/rutile Ti 0.9 Ir 0.1 O 2 catalyst exhibited the greater electrocatalytic stability in comparison with the conventional Pt/C electrocatalyst after 3600 s test at the potential 0.7 V. Apart from the strong interaction of the catalytic platinum nanoparticles and the rutile Ti 0.9 Ir 0.1 O 2 nanosupport, the advantageous TiO 2 ‐based materials such as i) much greater corrosion resistance than carbon‐support under the electrochemical environment and ii) the abundant hydroxyl group on their surface could act as cocatalyst of noble metal catalysts based on a bifunctional mechanism, facilitating the intermediate carbonaceous species cover the surface of the Pt nanocatalyst. [ 15,47 ]…”

“…Titanium dioxide (TiO 2 ), including three main crystalline phases such as anatase, rutile, and brookite, has been sparked significant interest as potential promising support for Pt‐based electrocatalysts because of its superior durability under electrochemical media as well as the strong metal–support interaction, leading to improving the fuel cell performance. [ 11–14 ] Wu et al [ 15 ] explored the effect of rutile TiO 2 and anatase TiO 2 nanostructures on the methanol electrochemical oxidation of the TiO 2 ‐supported PtAg catalyst, indicating that the rutile TiO 2 structure is superior to anatase TiO 2 as nanosupport for the bimetallic PtAg nanoparticle toward methanol oxidation both in acidic and alkaline environments. However, the reported procedures with the further calcination at high temperature have been normally utilized to prepare the rutile TiO 2 nanostructures, resulting in the large particle size and thus the significantly decreased surface area, limiting the distribution of the catalytic Pt nanoparticles.…”

Effect of Anode Material on Electrochemical Oxidation of Low Molecular Weight Alcohols—A Review

“…Due to their low-cost, stable physical properties, large surface areas and good conductivity, carbon materials, such as reduced graphene oxide (rGO) [ 13 , 50 , 51 ], graphene nanosheets (GNS) [ 13 ], carbon nanotubes (CNTs) [ 13 , 50 ], multiwalled carbon nanotubes (MWCNTs) [ 13 , 52 , 53 , 54 ], functionalized mesoporous carbon [ 13 ], exfoliated graphite (EG) [ 55 , 56 ], pyrolytic graphite [ 54 ] and glassy carbon (GC) [ 57 , 58 , 59 ] are widely used as catalyst support materials for the electrooxidation of low molecular weight organic compounds, such as methanol, ethanol and propanol.…”

“…Reduced graphene oxide has a high surface area and good conductive properties and is characterized by the presence of oxygen-containing functionalities that help effectively disperse catalyst particles and reduces the risk of CO poisoning of the final material because of its hydrophilic nature [ 13 , 50 , 51 ].…”

“…In contrast to acidic media, the addition of Ru does not improve platinum catalyst properties towards MOR [ 83 ], but the presence of Ni significantly improves platinum catalyst performance [ 122 ]. Other metal dopants, such as gold [ 83 ] or silver [ 50 ], have been tested as platinum catalyst additives. In the case of gold, a synergic effect has been observed, leading to obtaining the same electrode activity of 75% Au and 25% Pt on carbon support as Pt/C has been reported [ 83 ].…”