Modulation of metal/support interactions improves catalytic performance of Ni–Pt/CeO2 for hydrogen generation from hydrazine monohydrate

• Published in: International journal of hydrogen energy Vol. 50; pp. 1381 - 1390
• Main Authors: Qiu, Yu-Ping, Chen, Mu-Hua, Qin, Si-Huan, Yang, Zhi-Qing, Wang, Ping
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 02.01.2024
• Subjects: Chemical hydrogen storage; Hydrazine monohydrate; Hydrogen generation; Metal/support interaction; Stability of catalyst; Stability of catalyst; Hydrogen generation; Chemical hydrogen storage; Metal/support interaction; Hydrazine monohydrate
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2023.09.244

Controllable hydrogen generation through catalytic decomposition of hydrazine monohydrate (N2H4·H2O) holds promise for mobile and portable applications. However, the existing catalysts (such as Ni60Pt40/CeO2, CoPt/CeOx) often suffer from poor stability, and active site poisoning appears an important cause of deactivation. Here, we present a simple yet effective method to address this issue. By adding a Ce3+ salt during the precipitation-deposition process, we observed enhanced interactions between Ni–Pt alloy and CeO2 matrix, impacting the electronic structure and dispersion of Ni–Pt nanoparticles. Thus-obtained Ni4Pt/CeO2 catalyst exhibited an over two-fold increase in activity and an 80% retention after 10 cycles, outperforming conventional methods. The novel approach simultaneously improved activity and stability while maintaining a constant alloy composition. This catalyst demonstrated high activity, 100% H2 selectivity, and good stability in N2H4·H2O decomposition. Additionally, it enabled the construction of a high-capacity N2H4·H2O-based hydrogen generation system with rapid dynamic response. Integrating Ce3+ salt during the precipitation-deposition process in the fabrication of Ni–Pt/CeO2 catalysts yields enhanced metal-support interactions, which results in a marked improvement in both activity and stability for hydrogen production from hydrazine monohydrate when contrasted with conventional approaches. [Display omitted] •New approach for Ni–Pt/CeO2 catalysts towards N2H4·H2O decomposition is proposed.•Enhanced metal-support interactions using Ce3+ during precipitation-deposition.•New method improves both the intrinsic activity and Ni–Pt dispersion.•Thus-obtained Ni4Pt/CeO2 catalyst showed remarkable activity and high stability.