TY  - JOUR
AU  - Chen, Rui
AU  - Shu, Tie
AU  - Zhao, Fengling
AU  - Li, Yongfei
AU  - Yang, Xiaotong
AU  - Li, Jingwei
AU  - Zhang, Daliang
AU  - Gan, Li-Yong
AU  - Yao, Ke Xin
AU  - Yuan, Qiang
PY  - 2022
TI  - PtCu3 nanoalloy@porous PWOx composites with oxygen container function as efficient ORR electrocatalysts advance the power density of room-temperature hydrogen-air fuel cells
JO  - Nano Research
SN  - 1998-0124
SP  - 9010
EP  - 9018
VL  - 15
IS  - 10
AB  - 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.
UR  - https://doi.org/10.1007/s12274-022-4577-y
DO  - 10.1007/s12274-022-4577-y