Abstract
Sensoring properties of a hydrogen sensor that used electrolytes made of different crystal type manganese dioxides were compared. An electrolyte made of a manganese dioxide, which has a high purity of ramsdellite-type crystal structure, provided the best characteristics for the hydrogen sensor. To explain the sensor property, network model of oxygen-pairs to store protons with a weak covalent bond and to conduct protons along the network in the ideal crystal structure of ramsdellite manganese dioxide was proposed. The inter-atomic distance of those oxygen-pairs in the high purity of ramsdellite manganese dioxide was estimated between 2.57 and 2.60 Å using inelastic neutron scattering measurements. The property of the hydrogen sensor supported the unique proton conduction based on the network model.
| Original language | English |
|---|---|
| Pages (from-to) | 641-647 |
| Number of pages | 7 |
| Journal | Sensors and Actuators, B: Chemical |
| Volume | 183 |
| DOIs | |
| State | Published - 2013 |
Funding
We thank Y. Koyanaka for providing the lambda-MnO 2 sample. S. Shamoto and M. Tsujimoto gave helpful advices for the crystal analysis. The assistance in sample characterization from L. Jirik with HRMECS at IPNS in ANL is gratefully acknowledged. This work was partly supported by the Kurita Water & Environment Foundation , and MEXT/JSPS KAKENHI Grant No. 21560800 . Work at ORNL was supported by the DOE-BES and was managed by UT-Battelle, LLC, for DOE under Contract DE-AC05-00OR22725. Appendix A
| Funders | Funder number |
|---|---|
| DOE-BES | |
| MEXT/JSPS | 21560800 |
| UT-Battelle | |
| U.S. Department of Energy | DE-AC05-00OR22725 |
| Oak Ridge National Laboratory | |
| Kurita Water and Environment Foundation |
Keywords
- Hydrogen sensor
- Inelastic neutron scattering
- Manganese dioxide
- Proton conduction
- Surface proton
- Weak covalent bond