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Ultrathin ternary PtNiGa nanowires for enhanced oxygen reduction reaction
Chinese Chemical Letters ( IF 9.4 ) Pub Date : 2023-04-13 , DOI: 10.1016/j.cclet.2023.108445
Giday Fisseha , Yiping Hu , Yanan Yu , Shaojie Lu , Dongsheng Ma , Pei Nian , Zheng Wang , Qin Yue

Achieving high activity and durability for the oxygen reduction reaction (ORR) with an ultra-low amount of platinum is significant to promote the widespread application of proton exchange membrane fuel cells (PEMFCs). Here we report a new ultrathin (∼1 nm) ternary PtNiGa alloy nanowires (PtNiGa NWs) electrocatalyst, in which the presence of gallium (Ga) enhances the oxidation resistance of platinum (Pt) and nickel (Ni) and suppresses the dissolution of Ni. The mass and specific activities of PtNiGa NWs are about 11.2 and 7.6 times higher than those of commercial Pt/C catalysts for ORR. Moreover, the mass activity of PtNiGa/C NWs nanocatalyst decreased only by 12.8% and largely retained its electrochemical surface area (ECSA) after 10,000 potential cycles, compared with 38% loss of ECSA for commercial Pt/C catalyst. Therefore, this work provides a general guideline for preparing ternary alloy electrocatalysts and enhancing the activity and stability of the cathode ORR reaction of PEMFCs.



中文翻译:

用于增强氧还原反应的超薄三元 PtNiGa 纳米线

用超低用量的铂实现氧还原反应(ORR)的高活性和耐久性对于促进质子交换膜燃料电池(PEMFC)的广泛应用具有重要意义。在这里,我们报道了一种新型超薄(∼1 nm)三元PtNiGa合金纳米线(PtNiGa NWs)电催化剂,其中镓(Ga)的存在增强了铂(Pt)和镍(Ni)的抗氧化性并抑制了Ni的溶解。PtNiGa NWs 的质量和比活性分别比商用 Pt/C ORR 催化剂高约 11.2 和 7.6 倍。此外,PtNiGa/C NWs纳米催化剂的质量活性仅下降了12.8%,并且在10,000次电位循环后基本上保留了其电化学表面积(ECSA),而商用Pt/C催化剂的ECSA损失了38%。因此,这项工作为制备三元合金电催化剂和提高PEMFC阴极ORR反应的活性和稳定性提供了总体指导。

更新日期:2023-04-13
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