文献类型：期刊文献

英文题名：Molten salt synthesis of carbon-supported Pt-rare earth metal nanoalloy catalysts for oxygen reduction reaction

作者：Jiang, Yulin[1];Fu, Tao[2];Liu, Jiaxiang[3];Zhao, Jinbao[1,3];Li, Bing[2,4];Chen, Zhenjie[1]

机构：[1]Xiamen Univ, Collaborat Innovat Ctr Chem Energy Mat,Minist Edu, Engn Res Ctr Electrochem Technol,State Key Lab Ph, Coll Chem & Chem Engn,State Prov Joint Engn Lab P, Xiamen 361005, Peoples R China;[2]Longyan Univ, Coll Chem & Mat Sci, Fujian Prov Key Lab Clean Energy Mat, Longyan 364012, Peoples R China;[3]Xiamen Univ, Coll Energy, Xiamen 361005, Peoples R China;[4]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2022

卷号：12

期号：8

起止页码：4805

外文期刊名：RSC ADVANCES

收录：;EI(收录号：20220711650313);WOS:【SCI-EXPANDED(收录号:WOS:000753092800001)】；

基金：This work was supported by the Key Project of Science and Technology of Xiamen [grant number 3502Z20201013], the Research Launching Funds of Longyan University [grant number LB2018024], the Natural Science Foundation of Fujian Province, China [grant number 2021J05231], Opening Project of PCOSS, Xiamen University [grant number 201911] and the National Natural Science Foundation of China [grant number 22021001]. We acknowledge Tan Kah Kee Innovation Laboratory for the XPS measurements.

语种：英文

外文关键词：Binary alloys - Carbon - Electrocatalysts - Electrolytic reduction - Fused salts - Lithium compounds - Metal nanoparticles - Molar ratio - Oxygen - Particle size - Platinum - Potassium compounds - Rare earths - Synthesis (chemical)

摘要：The synthesis of nano-sized alloys of Pt and rare earth (RE) metal catalysts has been a huge challenge due to a significantly large standard reduction potential difference of Pt and RE metals and the high synthesis temperature. PtxY/C catalysts with an average particle size of around 21 nm, were synthesized by mixing K2PtCl4 with Y2O3 (a molar ratio of Pt : Y = 1 : 1) with a carbon support in a molten LiCl-CaH2 system by a one-step molten salt synthesis method at 600 degrees C. The synthesis processes of the PtxY/C alloys are proposed as follows: Pt nanoparticles were first obtained by the reaction of K2PtCl4 and CaH2 at 210 degrees C, then Y ions were preferentially reduced on the Pt nanoparticle surface by the reduction of CaH2, followed by PtxY alloy formation in the molten LiCl-CaH2 system at 600 degrees C. Molten LiCl provides a strong reducing environment and lowers the formation temperature of alloys. Pt2Gd/C and Pt2La/C were also obtained with Gd2O3 and La2O3 as the starting raw materials, respectively by using the same process. When investigated as an electrocatalyst for the oxygen reduction reaction (ORR), the half-wave potentials of PtxRE/Cs are all more positive than that of commercial Pt/C catalyst (e.g., 0.905 V for PtxY/C while 0.880 V for JM Pt/C), and the nano-sized PtxY/C alloy shows higher electrocatalytic activity toward the ORR and preferable catalytic durability with respect to JM Pt/C catalysts. This facile synthesis method provides an effective strategy for the preparation of Pt-RE based multicomponent nanoalloys, especially in large-scale production.