Day 3

What is the advantage of solid oxide fuel cell (SOFC) over proton exchange membrane fuel cell (PEM)?

• Temperature

• rapid start up

• fuel flexibility

• use of rare-earth elements

What is the typical thermoneutral potential for RSOFC?

• 0.8 V

• 1.29 V

• 1.47 V

• 1.6 V

WORLD RECORD in primary energy conversion efficiency of 74% to electricity using SOEC technology is reported by

• Elcogen

• Bloom

• Sulzer Hexsis

• Ceres power

Among the following rechargeable batteries, which one offers very high energy density.

• Lead acid battery

• Li-ion battery

• Li-air battery

• Li-sulfur battery

The decoupling of energy and power density is possible with

• all rechargeable energy storage and conversion devices

• fuel cells

• redox flow batteries

• not possible to decouple the energy and power

The main issues in Li-sulfur batteries is/are

• poor conductivity of sulfur

• dendrite growth of metallic growth

• polysulfide dissolution

• all the others

In which of the following structure types of ‘layered’ Na- transition metal oxides, the starting Na-content can be ~1 per formula unit?

• O3

• P2

• P3

• None of the above

In which of the following structure types of ‘layered’ Na- transition metal oxides, the Na-transport is relatively sluggish compared to the others?

• O3

• P2

• P3

• Na-transport kinetics in invariant with structure

In Li(Ni_xMn_yCo_z)O₂ (i.e., Li-NMC) based cathode materials, which of the cations is least likely to migrate to the Li-layer from the transition metal layer upon delithiation?

• Ni

• Mn

• Co

• None of the others can migrate

In a Zn-doped Li(Ni_xMn_yCo_z)O₂ (i.e., Li-NMC) structure, which of the cations is most likely to stably occupy the tetrahedral site of the Li-layer?

• Ni

• Mn

• Co

• Zn