Nanostructured manganese oxide on carbon for water oxidation: New findings and challenges. (15th December 2022)

• Record Type: Journal Article
• Authors: Salimi, Saeideh; Zand, Zahra; Hołyńska, Małgorzata; Allakhverdiev, Suleyman I.; Najafpour, Mohammad Mahdi
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 97(2022)
• Page Start: 40943
• Page End: 40951
• Publication Date: 2022-12-15
• Subjects: Artificial photosynthesis -- Hydrogen -- Manganese oxide -- Mesoporous carbon -- Oxygen -- Water-oxidation reaction; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.09.179
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Water-oxidation reaction (WOR) is a sluggish reaction for hydrogen production through water splitting. Herein, Mn oxide/mesoporous carbon (MC) is introduced as an active WOR catalyst under neutral conditions. The composite was synthesized through the reaction of permanganate and MC using a simple and low-cost procedure and characterized by scanning electron microscopy, in situ visible spectroscopy, energy-dispersive spectroscopy, (high-resolution) transmission electron microscopy, and X-ray diffraction. Then, the WOR activity of this composite was investigated under neutral conditions. The experiment shows that nanosized Mn oxide/MC is a promising catalyst for water-splitting systems. The overpotentials for the onset (based on the Tafel plot) and 1.0 mA of WOR are 700 and 940 mV, respectively. Based on the LSV, the Tafel slope is 378.6 mV per decade. Graphical abstract: Water-oxidation activity of nanostructured manganese oxide on mesoporous carbon under neutral conditions is investigated. Image 1 Highlights: Hydrogen is promising to store sustainable energy sources. Mn oxides are highly attractive as catalysts for water-oxidation reaction (WOR). Nanosized Mn oxide/mesoporous carbon (MC) is introduced as a catalyst for WOR. MC backbone acts as a conductive current collector, and the MnOx acts as a WOR catalyst.