Synthesis of low-cost Co-Sn-Pd/rGO catalysts via ultrasonic irradiation and their electrocatalytic activities toward oxygen reduction reaction,The Canadian Journal of Chemical Engineering

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Synthesis of low-cost Co-Sn-Pd/rGO catalysts via ultrasonic irradiation and their electrocatalytic activities toward oxygen reduction reaction
The Canadian Journal of Chemical Engineering ( IF 1.6 ) Pub Date : 2021-03-08 , DOI: 10.1002/cjce.24101
Huihua Wang ₁ , Lin Li ₁ , Shizhan Sheng ₁ , Channa Wang ₁ , Tianpeng Qu ₁ , Dong Hou ₁ , Deyong Wang ₁ , Minqi Sheng ₁

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Reduced graphene supported Co-Sn-Pd nanoparticle catalysts(Co_0.2Sn_xPd_y/rGO, x + y = 0.4) were successfully synthesized by reducing the trace amounts of ions (Pd²⁺, Sn²⁺, and Co²⁺) in the presence of reduced graphene via an ultrasonic irradiation method. Characterization of the Co_0.2Sn_xPd_y/rGO catalysts by X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicates that the Co_0.2Sn_0.2Pd_0.2/rGO catalyst with a mean diameter of ~3.8 nm is close to a single-phase solid solution. X-ray photoelectron spectroscopy (XPS) shows the binding energy of metallic Pd shifts to a higher angle in the Co_0.2Sn_xPd_y/rGO (x + y = 0.4) catalysts, indicating a shift of Pd electronic centre upon alloying with Co and Sn. Conventionally, ternary Co-Sn-Pd/rGO catalysts show greater oxygen reduction reaction (ORR) activities and durability than binary Pd-Co/rGO catalyst and 20 wt% Pt/C catalyst even at a very low Pd content. Among of the synthetic catalysts, the Co_0.2Sn_0.2Pd_0.2/rGO catalyst exhibits the best ORR activity (E_1/2 = 0.91 V, k = −57 mV · dec⁻¹) and dominates a 4-electron pathway in the ORR process (n = 3.95 ± 0.09, H₂O₂<4%). Also, the Co_0.2Sn_xPd_y/rGO (x + y = 0.4) catalysts display a remarkable advantage of high methanol tolerance compared to that of the commercial 20 wt% Pt/C catalyst, which make them potential candidates for direct methanol fuel cells.

中文翻译：

超声辐照合成低成本Co-Sn-Pd/rGO催化剂及其对氧还原反应的电催化活性

通过还原微量离子（Pd ²⁺、Sn ²⁺和Co ²⁺），成功合成了还原石墨烯负载的Co-Sn-Pd纳米颗粒催化剂（Co _0.2 Sn _x Pd _y /rGO, x + y = 0.4）在通过超声波辐照方法还原石墨烯的情况下。通过 X 射线衍射 (XRD) 和透射电子显微镜 (TEM) 表征Co _0.2 Sn _x Pd _y_{/rGO 催化剂表明 Co 0.2} Sn _0.2 Pd _0.2平均直径约为 3.8 nm 的 /rGO 催化剂接近于单相固溶体。X 射线光电子能谱 (XPS) 显示金属 Pd 的结合能在 Co _0.2 Sn _x Pd _y /rGO ( x + y = 0.4) 催化剂中向更高的角度移动，表明与 Co 合金化后 Pd 电子中心发生移动和锡。传统上，即使在非常低的 Pd 含量下，三元 Co-Sn - Pd/rGO 催化剂也显示出比二元 Pd-Co/rGO 催化剂和 20 wt% Pt/C 催化剂更高的氧还原反应 (ORR) 活性和耐久性。在合成催化剂中，Co _0.2 Sn _0.2 Pd _0.2/rGO催化剂表现出最佳的ORR活性（E _1/2 = 0.91 V, k = -57 mV · dec ^-1）并在ORR过程中主导4电子途径（n = 3.95 ± 0.09, H ₂ O ₂ < 4%）。此外，与商用 20 wt% Pt/C 催化剂相比，Co _0.2 Sn _x Pd _y /rGO ( x + y = 0.4) 催化剂显示出高甲醇耐受性的显着优势，这使其成为直接甲醇燃料的潜在候选者细胞。

更新日期：2021-03-08

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