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Updated: Jun 23, 2026

Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
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Electrocatalytic Hydrogenation of Pyrazine by Cu0.95Co2.05O4: Kinetics, Mechanism, and Performance
Xin Zheng1, Siyi Chen2, Hanyu Li1
1Electric Power Research Institute, Yunnan Power Grid Co., Ltd, Kunming, China.
Abstract:
Hydrogen storage remains a key challenge for hydrogen utilization. Liquid organic hydrogen carriers (LOHCs) are promising, but their practical application is limited by the harsh conditions of conventional thermal catalysis. Electrochemical hydrogenation offers a mild and safe alternative. Herein, nickel foam (NF), Co3O4/NF, Cu2O/NF, and Cu0.95Co2.05O4/NF are evaluated as electrocatalysts for pyrazine hydrogenation to piperazine. Cu0.95Co2.05O4/NF exhibited superior performance, achieving a current density of -56.3 mA cm- 2 at -0.2 V (vs. RHE). After 2 h, pyrazine conversion reached 99.8% with 96.1% piperazine selectivity, retaining 79.7% after 10 cycles. Mechanistic studies suggest Co sites generate active H* via the Volmer step, which migrates to Cu sites for pyrazine hydrogenation. The Cu-Co synergy enhances both H* formation and substrate adsorption. This process eliminates the need for external H2, improving system safety and demonstrating its potential for efficient LOHC hydrogenation.
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