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High-Performance Oxygen Reduction Electrocatalysis Enabled by 3D PdNi Nanocorals with Hierarchical Porosity

Liu, ZY (Liu, Zhenyuan)[ 1 ] ; Yang, XY (Yang, Xiaoyu)[ 1 ] ; Cui, LR (Cui, Lirui)[ 2 ] ; Shi, ZP (Shi, Zhaoping)[ 1 ] ; Lu, BQ (Lu, Bingqing)[ 1 ] ; Guo, XM (Guo, Xiaomeng)[ 1 ] ; Zhang, JB (Zhang, Jubing)[ 1 ] ; Xu, L (Xu, Lin)[ 1 ]*（徐林）; Tang, YW (Tang, Yawen)[ 1 ] ; Xiang, Y (Xiang, Yan)[ 2 ]*

[ 1 ] Nanjing Normal Univ, Jiangsu Key Lab New Power Batteries, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Sch Chem & Mat Sci, Nanjing 210023, Jiangsu, Peoples R China

[ 2 ] Beihang Univ, Sch Space & Environm, Beijing Key Lab Bioinspired Energy Devices, Beijing 100191, Peoples R China

PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION，201805,35, 5 ?特刊: SI

Cost-effective electrocatalysts for the oxygen reduction reaction (ORR) play pivotal roles in energy conversion and storage processes. Designing a 3D networked bimetallic nanostructure with hierarchical porosity represents a reliable and effective strategy for the advancement of electrocatalysts with greatly improved activity and stability. However, it still remains a tremendous challenge in fabricating such fantastic nanostructure via a feasible and economical approach. Herein, a facile cyanogel-bridged synthetic strategy is demonstrated to fabricate PdNi 3D nanocorals with hierarchical porosity. The elaborate integration of electronic and geometric effects endows the as-fabricated PdNi 3D nanocorals with substantially enhanced activity and durability toward the ORR, as compared with the monometallic counterparts (pure Ni and Pd), PdNi nanoparticles, and commercial Pd black catalyst. More importantly, even after 5000 cycles of accelerated durability tests, the PdNi nanocorals can still maintain well in the catalytic activities, composition, and architectural features. It is believed that the as-synthesized PdNi nanocorals may hold great promise in practical fuel cells and industrial applications. Furthermore, due to its simplicity and scale-up production capability, the present cyanogel-bridged synthetic strategy provides an attractive method for achieving other bi/trimetallic nanoalloys with both structural and compositional advantages for diverse electrochemical applications and beyond.

文章鏈接：

https://onlinelibrary.wiley.com/doi/abs/10.1002/ppsc.201700366