Anqi Zhao,Mengyun Hu,Zhengying Wu,Yong Wang,Jie Li,Yukou Du
Precisely tuning the morphology of palladium-based alloys is an effective strategy for enhancing the catalytic activity in alcohol electrooxidation. However, methods for synthesizing well-defined nanowires are often not universally applicable and tend to be relatively complex. In this study, we developed a universal method to synthesize PdM nanowires (M = Sn, Pb, Sb, Bi) using a straightforward one-pot solvothermal co-reduction technique. The electronic properties of palladium can be modified through the doping of other elements. The bimetallic synergistic effect endows PdSn nanowires (PdSn NWs) with exceptional catalytic activity in both the ethylene glycol oxidation reaction (EGOR) and the ethanol oxidation reaction (EOR). Specifically, the mass activity of PdSn nanowires in the EGOR was measured at 7.56 A mgPd⁻¹, which is 3.86 times more than that of commercial Pd/C. In the EOR, the mass activity reached 6.43 A mgPd⁻¹, demonstrating an 8.14-fold enhancement over commercial Pd/C. Furthermore, PdSn nanowires also exhibited excellent stability during stability tests. This study provides significant insights into the development of nanowires catalysts with highly efficient alcohol electro-oxidation performance.
The preparation of platinum-free electrocatalysts with ideal oxygen reduction reaction (ORR) activity is of great significance for cost-effective fuel cells. Herein, we synthesize a series of Pd-based (PdFe, PdCo, PdNi, and Pd) nanowires (PdM NWs). Their diameters are about 10 nm. And the lengths are up to even micrometers. The mass activity of the series of Pd-based catalysts followed the descending order: PdNi NWs/C > commercial Pt/C > PdCo NWs/C > PdFe NWs/C > pure Pd NWs/C. The optimal half-wave (E 1/2 ) of PdNi NWs/C (839 mV) is positive shift 138 and 25 mV compared with pure Pd NWs/C (701 mV) and commercial Pt/C (814 mV), respectively. The mass activity (MA) of PdNi NWs/C only dropped 28% after 10,000 potential cycles between 0.6 and 1.1 V versus RHE in acid medium. This work provides a promising and reliable strategy to synthesize high performance Pd-based electrocatalyst, which is promising alternative to expensive Pt-based electrocatalysts for fuel cells. Graphical Abstract TOC: We prepared bimetallic PdNi nanowires, which ORR mass activity higher than pure Pd nanowires and commercial Pt/C in acidic medium.
Xinyu Gu,Huiyu Sun,Nannan Zhang,Jun Yu,Jie Li,Changqing Ye,Yukou Du
One-dimensional (1D) Pd-based nanowire materials, characterized by high aspect ratios and exposed high-index crystal surfaces, are widely developed in the field of direct fuel cells. However, their synthesis methods are often not universal and necessitate demanding conditions, including high temperatures and metal templates, leading to resource consumption. In this study, we present a simple and universal one-step method for synthesizing PdM (Sb, Ir, and Bi) nanowire networks (NNWs) at room temperature. Leveraging their structural advantages and the synergistic effects between bimetals, PdM NNWs demonstrate exceptional electrocatalytic performance, exhibiting higher mass and specific activities as well as enhanced durability compared to Pd/C for the ethylene glycol and glycerol oxidation reactions. Notably, PdSb NNWs excelled in electrochemical tests, achieving the highest mass activities of 7.55 and 5.59 A mg −1 for the ethylene glycol oxidation reaction (EGOR) and glycerol oxidation reaction (GOR), respectively. Additionally, due to the semi-metallic properties of Sb, which can flexibly modify the chemical environment of Pd, the PdSb NNWs exhibited superior antitoxicity and a significantly lower decay of current density across three consecutive chronoamperometry (CA) tests. This research advances the synthesis of palladium-based nanostructures, providing impetus for the design of highly efficient electrocatalysts in the realm of direct alcohol fuel cells.
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