Wan Xian-Kai, Samjeské Gabor, Matsui Hirosuke, Chen Chaoqi, Muratsugu Satoshi, Tada Mizuki
Research Center for Materials Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8602, Japan.
Dalton Trans. 2021 May 25;50(20):6811-6822. doi: 10.1039/d1dt00647a.
Ultrafine bimetallic Pt-Ni nanoparticles, which catalyze the oxygen reduction reaction (ORR) efficiently, were successfully prepared in hollow porous carbon spheres (HPCSs) under the assistance of organic molecules. 2,2'-Dipyridylamine (dpa) was found to be most effective in preparing homogeneous small Pt-Ni nanoparticles (2.0 ± 0.4 nm) without the phase separation of Pt and Ni during synthesis, and the assistance of the organic molecules was investigated for the alloy nanoparticle formation. The Pt-Ni nanoparticle/HPCS catalyst synthesized in the presence of dpa exhibited remarkable electrochemical performance in the ORR showing a high mass activity of 3.25 ± 0.14 A mg-1Pt at 0.9 VRHE (13.5-fold higher relative to a commercial Pt/C catalyst), a large electrochemical surface area of 105 ± 8 m2 g-1Pt, and high durability. After 60 000 cycles of accelerated durability testing, the mass activity was still 12.3 times higher than that of the commercial Pt/C catalyst.
在有机分子的辅助下，成功地在中空多孔碳球（HPCSs）中制备了能有效催化氧还原反应（ORR）的超细双金属Pt-Ni纳米颗粒。发现2,2'-联吡啶胺（dpa）在制备均匀的小Pt-Ni纳米颗粒（2.0±0.4 nm）时最有效，合成过程中Pt和Ni无相分离，并研究了有机分子对合金纳米颗粒形成的辅助作用。在dpa存在下合成的Pt-Ni纳米颗粒/HPCS催化剂在ORR中表现出卓越的电化学性能，在0.9 VRHE时具有3.25±0.14 A mg-1Pt的高质量活性（相对于商业Pt/C催化剂高13.5倍）、105±8 m2 g-1Pt的大电化学表面积以及高耐久性。经过60000次加速耐久性测试后，质量活性仍比商业Pt/C催化剂高12.3倍。
