期刊
SCIENCE ADVANCES
卷 7, 期 30, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abe9083
关键词
-
资金
- KIST Institutional Program [2E30380, 2E31181]
- Global Frontier R&D Program on Center for Multiscale Energy System - Nation Research Foundation under the Ministry of Science, ICT, and Future Planning, Korea [2016M3A6A7945505]
- National Research Foundation (NRF) - Ministry of Science, ICT, and Future Planning [NRF2015M1A2A2056690]
- Global Frontier Hybrid Interface Materials (GFHIM) of the National Research Foundation of Korea (NRF) - Ministry of Science and ICT [2013M3A6B1078874]
- Saudi Aramco-KAIST CO2 Management Center
A three-dimensionally customized, multiscale Pt nanoarchitecture demonstrated superior performance and durability compared to commercial Pt/C materials in fuel cells. The study suggests that controlling the structure through precision engineering of reaction surfaces and mass transfer can lead to the design and fabrication of high-performance electrocatalysts.
Unsupported Pt electrocatalysts demonstrate excellent electrochemical stability when used in polymer electrolyte membrane fuel cells; however, their extreme thinness and low porosity result in insufficient surface area and high mass transfer resistance. Here, we introduce three-dimensionally (3D) customized, multiscale Pt nanoarchitectures (PtNAs) composed of dense and narrow (for sufficient active sites) and sparse (for improved mass transfer) nanoscale building blocks. The 3D-multiscale PtNA fabricated by ultrahigh-resolution nanotransfer printing exhibited excellent performance (45% enhanced maximum power density) and high durability (only 5% loss of surface area for 5000 cycles) compared to commercial Pt/C. We also theoretically elucidate the relationship between the 3D structures and cell performance using computational fluid dynamics. We expect that the structure-controlled 3D electrocatalysts will introduce a new pathway to design and fabricate high-performance electrocatalysts for fuel cells, as well as various electrochemical devices that require the precision engineering of reaction surfaces and mass transfer.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据