1. Department of Materials Science and Engineering, Norwegian University of Science and Technology, NTNU, Trondheim NO-7491, Norway
2. SINTEF Energy Research, Trondheim NO-7465, Norway
3. Department of Energy and Process Engineering, Norwegian University of Science and Technology, Trondheim NO-7491, Norway
4. Department of Materials Science and Engineering, Norwegian University of Science and Technology, NTNU, Trondheim N-7491, Norway