Designing molybdenum disulfide/nickel silicide@sodalite zeolite structure as a high performance core-shell catalyst for methanol oxidation. (5th May 2023)

• Record Type: Journal Article
• Authors: Jiang, Yuying; Zhou, Xibin; E, Yifeng; Wei, Pengyan; Chen, Peng; Li, Li; Li, Zhuozhe; Krenzel, Thomas F.; Qian, Kun
• Is Part Of: International journal of hydrogen energy. Volume 48:Number 39(2023)
• Page Start: 14717
• Page End: 14729
• Publication Date: 2023-05-05
• Subjects: Direct methanol fuel cell -- Sodalite -- Nanocomposite catalyst -- NiSi nanoparticles -- Clean energy; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2023.01.011
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: The design and synthesis of novel electrode catalysts is an applicable strategy to improve the performance of direct methanol fuel cells (DMFCs). The catalyst is composed of molybdenum disulfide as the shell and nickel silicide-doped sodalite (MoS2 /NiSi@SOD) as the core. A series of characterization results indicate that NiSi is highly dispersed in the nanosized SOD cage on the surface of the SOD zeolite at the crystal faces of (011), (102), and (201). A thin conductive protective cover is formed by MoS2 on the surface of the zeolite. By the cyclic voltammetry (CV), the catalyst performs a maximum current density of 46.9 mA cm −2 (1250.1 A gNi −1 ) with 10 M methanol while no remarkable catalyst poisoning and catalyst deactivation are observed. It is revealed that MoS2 /NiSi@SOD under high catalysis activity protects the Ni from the drain in the alkaline electrolyte, leading to a broad application prospect as a noble-metals-free DMFC catalyst. Graphical abstract: The MoS2 /NiSi@SOD composite material reveals high performance in MOR with an efficiency of 46.9 mA cm −2 and 1250.1 A g −1 in 10 M methanol. The novel electrochemical catalyst is composed of the NiSi NPs doped SOD structure nanocages as the core and the MoS2 nano wafer as the shell and is as-synthesized under hydrothermal condition through a self-assembly process in a one-pot reaction. During the crystallization of the zeolite, the NiSi nanocrystals are generated and restricted in the nanosized SOD cages. And the MoS2 shell near the zeolitic surface enhances the electronic transport efficiency and protects the NiSi NPs from the drain in the electrolyte during the electrocatalytic progress. The catalyst is characterized by high performance and low production cost, being a good candidate to replace noble metal catalysts in applications. Image 1 Highlights: The MoS2 /NiSi@SOD catalyst has been synthesized in hydrothermal conditions. NiSi nanoparticles are highly dispersed and located in the pore of the SOD zeolite. The low-cost catalyst plays high performance in MOR without obvious catalyst poisoning and deactivation.