In this study, the perovskite-type oxides Ba0.5Sr0.5Ni0.2Co0.6Fe0.2O3-δ (BSNCF) with different B-site transition metal elements were investigated as a new catalyst for methanol oxidation. They were prepared by the partial substitution of cobalt by nickel in Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) sample. Both materials prepared using a combined citrate/EDTA complexing method and their catalytic activitiesfor methanol oxidation were comparativelystudied using cyclic-voltammetry (CV) and chronoamperometry (CA)in alkaline media at room temperature.Structural, textural, morphological and redox properties of the synthesized solids were investigated by several physicochemical methods such as XRD, FTIR, LRS, SEM-EDX, BET and H2-TPR. The as-prepared materials were obtained with high purity and high crystallinity. The partial substitution of cobalt by nickel in BSCF perovskite changes the structure of the solid which pass from cubic structure to a mixture of cubic and hexagonal forms. This change is accompanied by an increase in BET surface area and a decrease in crystalline size. For the electro-catalysis measurements, results demonstrated that partially substituting of Co by Ni in BSCF structure enhance the electro-catalytical activity towards the oxidation of methanol under alkaline conditions, making it an electro-catalyst candidate for practical utilization in DMFCs.

中文翻译：

---

Ba0.5 Sr0.5 Nix Co0.8-x Fe0.2 O3-δ (x=0 and 0.2)钙钛矿作为碱性介质中甲醇氧化电催化剂的合成与表征

在这项研究中，研究了具有不同 B 位过渡金属元素的钙钛矿型氧化物 Ba0.5Sr0.5Ni0.2Co0.6Fe0.2O3-δ (BSNCF) 作为甲醇氧化的新催化剂。它们是通过在 Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) 样品中用镍部分取代钴来制备的。使用循环伏安法 (CV) 和计时电流法 (CA) 在室温碱性介质中比较研究了使用联合柠檬酸盐/EDTA 络合法制备的两种材料及其对甲醇氧化的催化活性。 合成固体的结构、质地、形态和氧化还原性质通过几种物理化学方法，如 XRD、FTIR、LRS、SEM-EDX、BET 和 H2-TPR 进行了研究。所制备的材料具有高纯度和高结晶度。在 BSCF 钙钛矿中，钴被镍部分取代，改变了固体的结构，从立方结构转变为立方和六方形式的混合物。这种变化伴随着 BET 表面积的增加和晶体尺寸的减小。对于电催化测量，结果表明，在 BSCF 结构中用 Ni 部分取代 Co 增强了碱性条件下对甲醇氧化的电催化活性，使其成为实际用于 DMFC 的电催化剂候选者。