TY  - JOUR
AU  - Xiao, Qiangfeng
AU  - Cai, Mei
AU  - Balogh, Michael P.
AU  - Tessema, Misle M.
AU  - Lu, Yunfeng
PY  - 2012
TI  - Symmetric Growth of Pt Ultrathin Nanowires from Dumbbell Nuclei for Use as Oxygen Reduction Catalysts
JO  - Nano Research
SN  - 1998-0124
SP  - 145
EP  - 151
VL  - 5
IS  - 3
AB  - This work demonstrates the synthesis of Pt ultrathin nanowires assisted by chromium hexacarbonyl [Cr(CO)6]. The nanowires exhibit a uniform diameter of 2–3 nm. The length can reach up to several microns. It was found that Cr species produced dumbbell-like nuclei which play a pivotal role in the formation of the Pt nanowires. Such Pt nanowires can be tuned to nanocubes by simply decreasing the concentration of [Cr(CO)6]. Compared to a commercial Pt/C catalyst (45 wt%, Vulcan, Tanaka) and Pt black (fuel cell grade, Sigma), the synthesized Pt nanowires exhibit superior performance in electrocatalytic oxygen reduction with a specific activity of 0.368 mA/cm2, which was 2.7 and 1.8 times greater than that of Pt/C (0.138 mA/cm2) and Pt black (0.202 mA/cm2), respectively. The mass activity of Pt nanowires (0.088 mA/μg) is 2.3 times that of Pt black (0.038 mA/μg) and comparable to that of Pt/C (0.085 mA/μg).
UR  - https://doi.org/10.1007/s12274-012-0191-8
DO  - 10.1007/s12274-012-0191-8