期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 6, 期 1, 页码 93-98出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.7b03580
关键词
Carbon nanotubes; Pt nanowires; Electrocatalyst; Oxygen reduction reaction; Fuel cells
资金
- Natural Sciences and Engineering Research Council of Canada (NSERC)
Development of highly durable electrocatalysts for oxygen reduction reaction (ORR) is critical for proton exchange membrane fuel cells. Herein, we report the synthesis, characterization, and electrochemical performance of 1D sulfur-doped carbon nanotubes (S-CNT) supported 1D Pt nanowires (PtNW/ S-CNT). PtNW/S-CNT synthesized by a modified solvothermal method possesses a unique web-like 3D architecture that is beneficial for oxygen reduction. We demonstrate that PtNW/SCNT exhibits impressive activity retention under potential cycling between 0.05 and 1.5 V vs RHE over 3000 cycles. The reductions in electrochemically active surface area (ECSA, 7% loss) and mass activity (19% loss) of PtNW/S-CNT after accelerated durability testing (ADT) are found to be much lower than the dramatic losses observed with commercial Pt/C (>99% loss in ECSA and mass activity) under identical conditions. The PtNVV/S-CNT catalyst also shows very high specific activity (1.61 mA cm(-2)) in comparison to Pt/C (0.24 mA cm(-2)).
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