Platinum nanocube catalysts for methanol and ethanol electrooxidation

Shape-controlled synthesis of Pt-Ir nanocubes with preferential (100) orientation and their unusual enhanced electrocatalytic activities

“…This is the typical feature of (100)-oriented Pt. Similar voltammetric results have been widely reported for Pt NPs with (100) preferential orientation in the literature [19,23]. The Pt-Ir nanocubes also show a anodic current peak at about −0.45 V (MSE) originated from the hydrogen desorption on Pt (100), which is similar to the pure Pt nanocubes.…”

“…All the CVs exhibit typical potential regions for hydrogen adsorption and desorption, the double layer potential region, and the surface oxide formation and reduction [62]. The hydrogen desorption peaks at about −0.57 V (MSE) and −0.45 V (MSE) in the anodic part are caused by the desorption of weakly and strongly-bound hydrogen species, respectively [19,23,62]. It is interesting to note that the hydrogen desorption profiles are different between the cubic Pt, Pt-Ir NPs and polycrystalline Pt-Ir NPs since H-adsorption/desorption is sensitive to the crystallographic structure of the surface [63].…”

“…As a result, great efforts have been devoted to synthesize Pt NPs with controlled shape to tailor their properties such as reactivity and selectivity [11][12][13][14][15]. For example, cubic Pt NPs exposing (100) surfaces have been found to benefit a wide variety of catalytic reactions [17][18][19][20][21][22][23][24]. Solla-Gullón et al [21,22,24] reported that the ammonia electro-oxidation is an extremely structure sensitive reaction (it takes place almost exclusively on Pt (100) sites) and thus the cubic Pt (100) NPs are much more active than polycrystalline Pt or Pt (111) NPs.…”

“…In addition, it has been reported that the Pt nanocube catalyst with the edge of stepped (100) faces favored the breakage of CH 3 OH and CH 3 CH 2 OH compared with polycrystalline Pt nanocatalyst. The Pt nanocube catalyst showed lower onset potential and higher current density compared with the polycrystalline Pt nanocatalyst [23]. Shape-controlled synthesis of Pt nanocubes, which are enclosed by (100) surfaces, has therefore received great attention as high-performance electrocatalysts [16,25,26].…”

Novel platinum–palladium bimetallic nanoparticles synthesized by Dioscorea bulbifera: anticancer and antioxidant activities

“…Pt nanocubes and nano-octahedra are recently reported to exhibit efficient catalytic activity for methanol and ethanol electro-oxidation, and also in hydrogen adsorption, desorption, ethylene hydrogenation, benzene hydrogenation, and p-nitrophenol hydrogenation, as well as for electrocatalytic applications. [11][12][13][14] Pt compound, cisplatin (cis-diaminedichloroplatinum) is a well known anticancer agent although it has high possibilities of treatment associated side effects. 15 Similarly, another such noble metal, Pd is also well known for its catalytic properties in carbon-carbon and carbon-heteroatom coupling reactions.…”