Disordered Manganese Oxide Nano-powder Prepared by Low-temperature Synthesis Followed by Acid Treatment

Disordered manganese oxide, prepared by low-temperature synthesis followed by acid treatment is introduced. Aggregated nano-powder of disordered manganese oxide was obtained in this method. The disordered manganese oxide is suitable starting material for the preparation of efficient adsorbents for the removal of harmful metals from the environment

Sensoring hydrogen gas concentration using electrolyte made of proton conductive manganese dioxide

Hydrogen gas promises to be a major clean fuel in the near future. Thus, sensors that can measure the concentrations of hydrogen gas over a wide dynamic range (e.g., 1–99.9%) are in demand for the production, storage, and utilization of hydrogen gas. However, it is difficult to directly measure hydrogen gas concentrations greater than 10% using conventional sensor [1], [2], [3], [4], [5], [6], [7], [8], [9], [10] and [11]. We report a simple sensor using an electrolyte made of proton conductive manganese dioxide that enables in situ measurements of hydrogen gas concentration over a wide range of 0.1–99.9% at room temperature

Extracting Tritium from Water Using a Protonic Manganese Oxide Spinel

<div><p>Extracting tritium of parts-per-trillion-levels from water at room temperature was provided using a protonic manganese oxide with a spinel crystal structure under weakly acidic conditions. Indeed, using 0.48 g of the protonic manganese oxide powder led to the removal of 1.75 × 10⁵ Bq of tritium in 20 min at room temperature from a test water (100 mL) that contained a tritium concentration of 5.6 × 10⁶ Bq/L (i.e., 15.6 ng/L). The extraction capability of tritium significantly depended on the crystal structure of manganese oxides and the proton content in the spinel crystal structure.</p></div

Organic–inorganic hybrid titanophosphite proton conductive membranes with graded monomer conversion

Further advances in polymer electrolyte fuel cells require membranes that can operate at intermediate temperatures between 100 and 150 °C. In this study, we report a unique organic–inorganic hybrid titanophosphite membrane possessing high proton conductivity at such intermediate temperatures. The membrane was prepared to have a graded monomer conversion from its surface to its inner parts, by ultraviolet light (UV) absorption of titanate during UV-initiated photopolymerization. The surface of the membrane was completely polymerized to be water durable, whereas its inner parts were weakly polymerized, thus allowing VPA to function as a proton donor. This gives proton conductivities that are as high as 6.3 × 10[− 4] S cm[− 1] at 130 °C under a dry atmosphere