Investigating hydrogen storage behavior of CuMnO₂glass-ceramic material

Abstract

SUMMARY Crednerite glass‐ceramic material (CuMnO2) has been investigated for the first time as a hydrogen storage candidate. The average gravimetric capacity is about 16 g H2/kg and about 50 g H2/kg of CuMnO2 at 473 and 573 K respectively under a pressure up to 20 bars. The hydrogen adsorbed capacity (weight percent) of CuMnO2 increased with increasing temperature. The material doesn't release hydrogen during desorption cycle revealing storage of hydrogen in the prepared material. X‐ray diffraction patterns reveal a structure corresponding to Cu2O, CuMnO2, and traces of CuO and SiO2 phases. X‐ray diffraction patterns exhibit a reduction of copper ions to copper metal beside cristobalite and traces from manganese oxide phase after exposing to H2 at 80 and 573 K. This reduction of Cu ions into Cu metal may explain the irreversibility of hydrogen adsorption process. Thermal stability detected by differential scanning calorimetry and thermal gravimetric analysis shows decomposition temperature up to ~473 K followed by gain of weight till 1173 K then another decomposition till 1273 K. Copyright © 2013 John Wiley & Sons, Ltd.

Oxygen storage capacity and thermal stability of the CuMnO2–CeO2 composite system

“…In the search for better OSMs, crednerite CuMnO 2 as an alternative phase to delafossite-type CuMO 2 seems to have great potential due to its changeable valence and low-temperature for oxygen uptake/release, 15,18 and its wide applications, such as a hydrogen photo-evolution catalyst, 19 a three-way catalyst for the removal of exhaust gases (e.g., CO, NO x ), 15 and hydrogen storage. 20 As reported by several research groups, crednerite CuMnO 2 exhibits a monoclinic structure at room temperature, which consists of edge-shared MnO 6 octahedra and two-coordinated Cu + cations at the interlayer sites, as represented in Fig. 1.…”

Effects of crystallization and microstructure on the dc electrical conductivity in the system xCuO–(70−x) MnO–30SiO2

“…This is clearly seen in the present investigation; e.g. the columnar shapes leads to increasing in the activation energy of the glass-ceramic systems as in 10 ---------- …”

“…It is due to the Jahn-Teller distortion of the Mn 3+ ( 1 g 3 2g e t ) cation lifts the e g orbitals degeneracy leading to a distorted monoclinic structure (C2/m) at room temperature. CuMnO 2 shows three dimensional antiferromagnetic spin ordering at low temperatures [8][9][10].…”

Relationship between morphological and physical properties in nanostructured CuMnO2

“…In the last few decades, there has been a renewed interest in the research on the CuMnO 2 material due to its an exceedingly rich spectrum of potential applications. As a p-type semiconductor [5][6][7], electrode material [8], CuMnO 2 has also been examined regarding photocatalytic activities for hydrogen production or hydrogen storage [9][10][11], oxygen storage [12,13], energy storage [14,15] as well as in the context of multiferroic peculiarities [16]. Remarkably, by the use of a hydrothermal method, nanoparticles with diameters of 50 -100 nm [6], or nanowires [15], can be obtained.…”