The carbon dots anchored Ag and Pd bimetallic as highly active and stable catalysts toward oxygen reduction reaction

IF 3.5 3区 材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Science Pub Date : 2024-12-21 DOI:10.1007/s10853-024-10457-2
Siyu Chu, Min Sun, Liping Kang, Xiaowen Guo, Haiyan Wang, Bin Li, Zijiong Li
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Abstract

Although carbon-based catalysts show great potential in oxygen reduction reaction (ORR), it is still a challenge to increase their catalytic efficacy while reducing the amount of precious metals such as platinum and palladium. In this research, a palladium–silver bimetallic catalyst (Pd–Ag/CD) was flexibly synthesized through the in-situ self-reduction of palladium chloride and silver nitrate by carbon dots (CD). This novel catalyst displayed remarkable activity for the ORR, with peak potential, onset potential, and half-wave potential recorded at 0.89 V, 1.004 V, and 0.88 V, respectively. The exceptional performance of Pd–Ag/CD is attributed to the synergistic adjustment of the d-band by the palladium and silver metals, which optimizes the adsorption of oxygen and boosts the reaction's overall activity. Additionally, the slight negative shift of 12 mV in the half-wave potential after 5000 cycles indicates the catalyst's excellent durability. The findings of this study offer valuable theoretical insights for the development of carbon nanomaterial-based catalytic systems.

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碳点锚定银、钯双金属作为氧还原反应的高活性稳定催化剂
虽然碳基催化剂在氧还原反应(ORR)中显示出巨大的潜力,但如何在提高其催化效能的同时减少铂、钯等贵金属的用量,仍然是一个挑战。本研究通过碳点(CD)原位自还原氯化钯和硝酸银,灵活地合成了钯银双金属催化剂(Pd-Ag /CD)。该催化剂的峰值电位、起始电位和半波电位分别为0.89 V、1.004 V和0.88 V。Pd-Ag /CD的优异性能归因于钯和银金属对d带的协同调节,从而优化了对氧的吸附,提高了反应的整体活性。此外,在5000次循环后,半波电位的轻微负移为12 mV,表明催化剂具有优异的耐久性。本研究结果为碳纳米材料催化体系的发展提供了有价值的理论见解。
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阿拉丁
PdCl2
阿拉丁
AgNO3
来源期刊
Journal of Materials Science
Journal of Materials Science 工程技术-材料科学:综合
CiteScore
7.90
自引率
4.40%
发文量
1297
审稿时长
2.4 months
期刊介绍: The Journal of Materials Science publishes reviews, full-length papers, and short Communications recording original research results on, or techniques for studying the relationship between structure, properties, and uses of materials. The subjects are seen from international and interdisciplinary perspectives covering areas including metals, ceramics, glasses, polymers, electrical materials, composite materials, fibers, nanostructured materials, nanocomposites, and biological and biomedical materials. The Journal of Materials Science is now firmly established as the leading source of primary communication for scientists investigating the structure and properties of all engineering materials.
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