4965
Views
21
Crossref
20
WoS
20
Scopus
0
CSCD
It is challenging and desirable to construct Pt-based nanocomposites with oxygen storage function as efficient oxygen reduction reaction (ORR) catalysts for practical proton exchange membrane fuel cells (PEMFCs). Herein, we achieve novel porous nanocomposites of PtCu3 nanoalloys-embedded in the PWOx matrix (PtCu3@PWOx), which has an oxygen container feature. The PtCu3@PWOx/C exhibits an ultrahigh mass activity (MA) of 3.94 A·mgPt−1 for ORR, which is 26.3 times as high as the commercial Pt/C and the highest value ever reported for PtCu-based binary system. Theoretical calculations reveal that the compressive strain and d-band center downshift of Pt intrinsically contribute to the excellent ORR performance. In H2-air PEMFCs at room temperature, furthermore, the PtCu3@PWOx/C delivers a high power density (218.6 mW·cm−2), much superior to commercial Pt/C (131.6 mW·cm−2). In H2-O2 PEMFCs, PtCu3@PWOx/C outputs a maximum power density of 420.1 mW·cm−2. This work provides an effective idea for designing oxygen-storing ORR catalysts used for practical room-temperature H2-air fuel cells.
This work was supported by the National Natural Science Foundation of China (No. 21571038), Foundation of Guizhou Province (No. 2019-5666), Education Department of Guizhou Province (No. 2021312), State Key Laboratory of Coal Mine Disaster Dynamics and Control (Chongqing University, No. 2011DA105287-ZR202101), State Key Laboratory of Physical Chemistry of Solid Surfaces (Xiamen University, No. 202009), and the Open Fund of the Key Lab of Organic Optoelectronics & Molecular Engineering (Tsinghua University). We gratefully acknowledge Analytical and Testing Center of Chongqing University.