Bimetallic Bi and Ni doped LTA zeolite as synergy electrocatalyst towards high concentration of methanol oxidation reaction

One of the important factors determining the expansion of the application domain of direct methanol fuel cell (DMFC) is its energy density. The bismuth-nickel doped LTA zeolite was as-synthesized in hydrothermal condition and applied into the electrochemistry catalysis of methanol oxidation reaction (MOR) with high performance in the methanol concen-tration ranging from 0.5 M to 35 M without observed catalyst poisoning. A trace amount of Bi and Ni atoms are highly dispersed on the opening window of the zeolitic surface by the electrochemical rearrangement process. The surface of the LTA structure zeolite is a good carrier for the metal cations with Na cations which could be replaced in hydrothermal crystalline process while the inner direct pores provide a channel for CO gas to escape and prevent catalyst poisoning in electrochemistry progress. Through the comparative study with the Bi doped LTA, Ni doped LTA and the commercial Pt/C catalyst, the Bi and Ni doped LTA reveals higher performance in monatomic catalytic efficiency and electrochemical stability. And through the mutual interaction of diatomic, the doped zeolite material highly improves the energy density of methanol fuel cells and reduces the cost of the cells con-cerning the absence of noble metals.(c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

The bismuth-nickel doped LTA zeolite shows high performance as a catalyst for the methanol oxidation reaction, with no observed catalyst poisoning in a wide range of methanol concentrations. Bi and Ni atoms are dispersed on the zeolitic surface, providing a good carrier for metal cations and preventing catalyst poisoning. The doped zeolite significantly improves the energy density of methanol fuel cells and reduces the cost by enhancing monatomic catalytic efficiency and electrochemical stability.