Jianbo Zhang,Kun Lei,Ji Cheng,Lingqing Luo,Xiaojun Liu,Jinghua Li
This study focused on preparing sea urchin palladium-copper nanospines (PdCuAu NAs) using a one-step reduction method. PdCuAu NAs is a highly branched nanomaterial composed of nanospines, and its unique structure and trimetallic composition give it excellent Fenton catalytic activity and photothermal properties. The characterization of PdCuAu NAs was carried out using SEM, XPS , and UV-Vis techniques. Under near-infrared light, PdCuAu NAs were quickly heated to 50 ℃. Compared to traditional photocatalysts , PdCuAu NAs showed better Fenton catalytic activity in the degradation of organic dyes such as MB. Furthermore, it exhibited good photothermal stability and reusability after multiple thermal cycles and repeated use. Thus, the results showed that PdCuAu NAs had a good degradation effect on organic wastewater.
The design of highly branched Pd-based nanostructures is very important for various electrocatalytic applications. Herein, we report a very simple one-step method for direct fabrication of tri-metallic PdCuAu nanothorn assemblies (PdCuAu NAs) in aqueous solution. The obtained unique PdCuAu NAs with a well-defined shape are highly branched and self-supported nanostructures assembled from staggered nanothorns as building blocks, and exhibit superior catalytic activity, durability and methanol-tolerant ability for the oxygen reduction reaction, benefiting from their branched structure and tri-metallic compositions. In comparison with traditional routes, the newly developed one-step fabrication method without the need for any seed, multi-step procedure and organic solvent is very feasible for the fabrication of branched multi-metallic Pd-based catalysts with designed compositions.
Metallic Pd is widely recognized as an efficient electrocatalyst for the formic acid oxidation reaction (FAOR), which unfortunately suffers from poor durability owing to Pd dissolution and CO poisoning. The present work describes an effective method to enhance Pd durability by alloying with Cu and Au. Cu could provide surface OH at low potentials to remove poisonous CO for improved CO resistance. Au, the most inert metal, was added to reduce Pd and Cu dissolution. Moreover, alloying with Cu and Au could also modulate the electronic structure of Pd which is just profitable for the FAOR. The constructed PdCuAu with a nanoporous structure exhibits a specific activity of 14.9 mA cm–2 and a Pd mass activity of 6012 A g–1, which is ∼15 times and ∼14 times higher than those of commercial Pd/C. While these two electrocatalysts were used as fuel cell anodes, the maximum power density of the PdCuAu anode (Pd loading 10 μg cm–2) is 93.2 mW cm–2 and the value of the Pd/C anode (Pd loading 1.2 mg cm–2) is 60.3 mW cm–2. The power efficiency of Pd has been notably increased by 185 times in this home-made nanoporous PdCuAu ternary alloy electrocatalyst.
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