Yellatur Chandra Sekhar, Padmasale Raghavendra, T Maiyalagan, Loka Subramanyam Sarma
Nanoelectrochemistry Laboratory, Department of Chemistry, Yogi Vemana University, Kadapa-516 005, Andhra Pradesh, India.
Department of Chemistry, Rajiv Gandhi University of Knowledge Technologies (RGUKT)-AP, IIIT Campus, ONGOLE-516 216, Andhra Pradesh, India.
Nanotechnology. 2022 May 25;33(33). doi: 10.1088/1361-6528/ac6df7.
Development of electrocatalysts with extended homogeneity and improved metal-support interactions is of urgent scientific need in the context of electrochemical energy applications. Herein, bimetallic Pt-Pd nanoparticles with good homogeneity are fabricated using a convenient solution phase chemical reduction method onto a reduced graphene oxide (rGO) support. X-ray diffraction studies revealed that Pt-Pd/rGO possesses the crystallite size of 3.1 nm. The efficacies of Pt-Pd/rGO catalyst (20 wt% Pt + 10 wt% Pd on rGO support, Pt:Pd atomic ratio = 1:1) towards ethanol electrooxidation reaction (EOR) are evaluated in acidic conditions by cyclic voltammetry using catalyst-coated glassy carbon electrode as a working electrode. With the better dispersion on rGO support the Pt-Pd/rGO nancomposite catalyst exhibit highest mass specific activity (0.358 mA/µg-Pt) which is observed to be 1.9 times of similarly synthesized 20 wt% Pt/rGO (0.189 mA/µg-Pt) and 2.5 times of commercial 20 wt% Pt/C (0.142 mA/µg-Pt), respectively. Apart from the observed improved EOR activity, the Pt-Pd/rGO catalyst exhibited better stability than Pt/rGO and Pt/C catalysts. Strong synergy offered by Pt, Pd and rGO support could contribute to the observed higher EOR activity of Pt-Pd/rGO.
在电化学能源应用领域，开发具有更高均匀性和更强金属-载体相互作用的电催化剂是一项迫切的科学需求。在此，采用简便的溶液相化学还原法，在还原氧化石墨烯（rGO）载体上制备了具有良好均匀性的双金属Pt-Pd纳米颗粒。X射线衍射研究表明，Pt-Pd/rGO的微晶尺寸为3.1 nm。以涂覆有催化剂的玻碳电极作为工作电极，通过循环伏安法在酸性条件下评估了Pt-Pd/rGO催化剂（rGO载体上20 wt% Pt + 10 wt% Pd，Pt:Pd原子比 = 1:1）对乙醇电氧化反应（EOR）的催化效果。由于在rGO载体上具有更好的分散性，Pt-Pd/rGO纳米复合催化剂表现出最高的质量比活性（0.358 mA/µg-Pt），分别是类似合成的20 wt% Pt/rGO（0.189 mA/µg-Pt）的1.9倍和商业20 wt% Pt/C（0.142 mA/µg-Pt）的2.5倍。除了观察到的EOR活性提高外，Pt-Pd/rGO催化剂还表现出比Pt/rGO和Pt/C催化剂更好的稳定性。Pt、Pd和rGO载体之间强大的协同作用可能是Pt-Pd/rGO具有更高EOR活性的原因。
