Tuning Ion Complexing To Rapidly Prepare Hollow Ag–Pt Nanowires with High Activity toward the Methanol Oxidization Reaction.

Liu, Fangyan; Qi, Peimei; Liang, Xiaoli; Chen, Wei; Li, Benxia; Zhang, Lijie; Yang, Yun; Huang, Shaoming

Hollow Pt‐based nanowires (NWs) have important applications in catalysis. Their preparation often involves a two‐step process in which M (M=Ag, Pd, Co, Ni) NWs are prepared and subsequently subjected to galvanic reaction in solution containing a Pt precursor. It is challenging to achieve a simple one‐step preparation, because the redox potential of PtIV/Pt or PtII/Pt to Pt is high, and therefore, Pt atoms always form first. This work demonstrates that an appropriate pH can decrease the redox potential of PtIV/Pt and allows the one‐step preparation of high‐quality hollow Pt–Ag NWs rapidly (10 min). Moreover, it is easy to realize large‐scale preparation with this method. The NW composition can be adjusted readily to optimize their performance in the electrocatalytic methanol oxidization reaction (MOR). Compared with commercial Pt/C, NWs with appropriate Ag/Pt ratios exhibit high stability, activity, and CO tolerance ability. Hollow nanowires: High‐quality hollow Pt–Ag nanowires with controlled compositions are rapidly (10 min) prepared by using a one‐step method at room temperature. Tuning the complexing environment of PtIV is the key factor to the successful preparation of Pt–Ag nanowires. Appropriate Ag/Pt ratios significantly can enhance their catalytic performance for the methanol oxidization reaction (see scheme).

OXIDATION of methanol; PLATINUM catalysts; NANOWIRES; CATALYTIC activity; PH effect; OXIDATION-reduction reaction

Chemistry - A European Journal, 2018, Vol 24, Issue 65, p17345

0947-6539

Academic Journal

10.1002/chem.201804250