Tang J, Meng HM, Ji MY. Energy-saving electrolytic γ-MnO
2 generation: non-noble metal electrocatalyst gas diffusion electrode as cathode in acid solution.
RSC Adv 2019;
9:24816-24821. [PMID:
35528644 PMCID:
PMC9069914 DOI:
10.1039/c9ra02993a]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Accepted: 08/03/2019] [Indexed: 11/21/2022] Open
Abstract
γ-MnO2, which is commercially used as an electrode material in batteries, is produced using large amounts of energy and leads to the production of high pollution as a secondary product. Ideally, this material should be fabricated by energy efficient, non-polluting methods at a reasonable cost. This study reports the green fabrication of γ-MnO2 into a gas diffusion electrode with Pt-free catalysts in acid solution. Cobalt oxide nanoparticles were deposited on few-layer graphene sheets produced via a simple sintering and ultrasonic mixing method, leading to the fabrication of cobalt oxide/few-layer graphene. Co3O4 nanoparticles are irregularly shaped and uniformly distributed on the surface of the few-layer graphene sheets. Characterization was conducted by X-ray diffraction, X-ray photoelectron spectroscopy, and field emission scanning electron microscopy. Electrochemical characterization revealed the performance of cobalt oxide/few-layer graphene gas diffusion electrode in an electrolyte of 120 g L−1 manganese sulfate + 30 g L−1 sulfuric acid at 100 A m−2 at 80 °C. The cobalt oxide/few-layer graphene gas diffusion electrode exhibited a lower cell voltage of 0.9 V and higher electric energy savings of approximately 50% compared with traditional cathodes (copper and carbon).
Co3O4/FLG was used as a nanocatalyst to catalyze the ORR in the electrodeposition of MnO2. The proposed Co3O4/FLG nanocomposite GDE exhibited a high activity of 0.9 V at a current density of 100 A m−2.![]()
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