结构有序化金属间Pt_(3)Co纳米线用于强化电催化氧还原反应  

Preparation of Structurally Ordered Intermetallic Pt_(3)Co Nanowire and Its Electrocatalytic Performance for Oxygen Reduction Reaction

作　　者：吴啟帆 陈子浩 张海清 苏轶坤[1] Wu Qifan;Chen Zihao;Zhang Haiqing;Su Yikun(College of Materials Science and Engineering,Shenzhen University,Shenzhen 518000,China)

机构地区：[1]深圳大学材料学院,广东深圳518000

出　　处：《稀有金属材料与工程》2021年第1期138-144,共7页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51742165)。

摘　　要：为了达到精准合成材料,且最大程度地使用铂的目的,本研究使用多孔氧化铝模板(AAO)进行恒电位沉积,在一定浓度的溶液中合成Pt_(3)Co一维合金纳米线。随后,合金纳米线在真空环境下进行高温退火,分别在400和650℃转变为无序相和有序相Pt_(3)Co纳米线并通过结构表征证明其已实现有序化转变。合金催化剂在AAO模板内退火,有效地防止了其在高温环境中产生团聚。通过磷酸和铬酸的溶解,合金纳米线从AAO中释放,并用于电催化氧还原反应测试。正如预期一样,与无序Pt_(3)Co纳米线和商业Pt/C颗粒相比,有序Pt_(3)Co纳米线表现出更好的半波电位和质量活性,证实了有序Pt_(3)Co纳米线在元素分布和晶格结构上的优势。此外,有序和无序Pt_(3)Co纳米线在经过5000次耐久性循环测试后,仍然比Pt/C颗粒具有更强的稳定性。由此可以看出,有序Pt_(3)Co纳米线作为一种可接受的,具有潜在商业价值的催化材料,成为未来燃料电池催化剂的备选材料。In order to achieve accurate synthesis of materials,and to achieve the maximum utilization of platinum,anodic aluminum oxide(AAO)template was used to synthesize bimetallic one-dimensional Pt_(3)Co nanowires in a certain concentration of solution.Results show that the alloy nanowires undergo a high-temperature phase transition in the template under vacuum,which effectively prevented the material agglomeration.The disordered and ordered Pt_(3)Co nanowires are obtained by phase transition annealing at 400 and 650℃,respectively and confirmed by structural characterizations for order phase transition.As expected,compared to disordered Pt_(3)Co,ordered Pt_(3)Co exhibits better mass activity and half-wave potential,confirming the advantages of ordered bimetal alloy nanowires in composition and structure.After the accelerated durability cycle tests,the ordered and disordered Pt_(3)Co nanowires are still more stable than Pt/C particles,indicating the advantage of one-dimensional nanowires.The ordered Pt_(3)Co,as an acceptable catalytic material with potential commercial value,has become alternative materials for future fuel cell catalysts.

关 键 词：催化剂 Pt_(3)Co纳米线 氧还原反应 晶体结构 

分 类 号：O643[理学—物理化学]