期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 4, 页码 2862-2869出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00205
关键词
metal cation; PtCu nanoframes; spiny nanothorns; oxygen reduction reaction; methanol oxidation reaction
资金
- Science and Technology Major Project of Guangxi [Gui Ke AA18118046]
- National Key R&D Program of China [2016YFD0500706]
- National Natural Science Foundation of China [21778020]
- Sci-tech Innovation Foundation of Huazhong Agriculture University [2662017PY042, 2662018PY024]
Metal cation is an emerging type of morphology controlling agency in nanoscience, but has rarely been used in fabrication of hollow structures. Herein, with the addition of Ni2+ ion, PtCu alloy octahedral nanoframes (PtCu AONFs) with plenty of spiny nanothorns on the apexes are synthesized via one-step hydrothermal reaction. Ni2+ ion plays a pivotal role in forming hollow structures because it facilitates the diffusion of Cu atoms in the replacement reaction between initially formed Cu templates and PtCl62-. The as-prepared PtCu AONFs show a superior electrocatalytical activity and durability toward oxygen reduction reaction (ORR) with a mass activity (MA) and specific activity (SA) of 0.28 A/mg(pt) and 0.50 mA/cm(2) at 0.90 V vs reversible hydrogen electrode (RHE), which are 2.8- and 2.6-fold times that of commercial Pt/C (0.10 A/mg(pt) and 0.19 mA/cm(2)). In addition, the electrocatalytical oxidation property of PtCu AONFs toward methanol also better than that of commercial Pt/C. This study offers a new strategy for synthesizing hollow electrocatalysts with enhanced properties.
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