Capacity doping

Polyacene is classified as a material which does not belong to either soft or hard carbons [84], It is also made by heat-treatment of phenol resin. As the heat-treatment temperature is lower than about 1000 °C, polyacene contains hydrogen and oxygen atoms. It has a conjugated plane into which lithium ions are doped. It was reported that the discharge capacity of polyacene is more than 1000 mAhg. However, there are no practical lithium-ion batteries using polyacene. 

In the first three cycles, the capacity of the alanate is high for both materials, the titanium metal-doped and the nitride-doped material. However, after 15 cycles the hydrogen capacity decreases significantly below 4% for the titanium metal-doped sample, whereas for the nitride-doped sample the capacity remains high at about 5% hydrogen. 

For zirconia-doped ceria it was shown that redox cycling can enhance the oxygen storage capacity, see F. Fally, V. Perrichon, H. Vidal, J. Kaspar, G. Blanco, J. M. Pintado, S. Bernal, G. Colon, M. Daturi, J.C. Lavalley, Catalysis Today, 59, 373 (2000). 

Figure 3 shows changes of the ESR and capacity during cycling. High stability of conductive carbon, represented by Boron-doped refined graphite (2939APH RG) in this critical test conditions was observed. 

Figure 5. Comparison of the reversible and irreversible capacities of the original and ground B-doped carbon from WUT.

Commercial and non-commercial carbons were tested for their applicability as anode of lithium-ion battery. It was found that Superior Graphite Co s materials are characterized both by high reversible capacities and low irreversible capacities and thus can be regarded as good candidates for practical full cells. Cylindrical AA-size Li-ion cells manufactured using laboratory techniques on the basis of SL-20 anode had initial capacities over 500 mAh (volumetric energy density ca. 240 Wh/dm3). Boron-doped carbon... 

The shape of the isotherms of nitrogen ad/desorption (type IV, IUPAC) for SBA-15 and its replicas indicates the presence of mesopores and a small fraction of micropores. The isotherms for all the N-doped replicas of SBA-15 (Fig. la) are of the shape similar to that of the isotherm for a typical CMK-3 material [4]. The mesopores are also similarly large (ca. 4 nm, Fig. lc). However, the sorption capacities differ notably, being 1.1 and 1.40-1.76 cm3/g for CMK-3 and CMK-3N, respectively. 

The BET surface areas are quite large 1635 and 2021 m2/g for CMK-3N1.25 and CMK-N2.00, respectively. The Fe-modified SBA-15 of a lower sorption capacity gives a replica with a higher sorption capacity. Sorption capacities of the N-doped CMK-3 carbons are higher than those of the CMK-3 ones made from sucrose, which results from an increase in the wall thickness of SBA-15 after insertion of Fe (Fig. la). 

Increasing the operating temperature of a physisorption storage system will require going beyond current carbon and MOF nanostructures. A possible strategy is to enhance the sorption capacity of carbon nanostructures by doping them with certain metals, which... 

We shall report hereafter three examples of measurement of heat capacity the first (of a crystal) with a negligible addendum the second (of a polymer) with a heavy addendum the third is the measurement of the carrier specific heat of a heavily doped semiconductor. 

Figure 12.4 shows an example of experimental set up for a classical measurement of heat capacity the sample is glued onto a thin Si support slab. The thermometer is a doped silicon chip and the heater is made by a ( 60 nm thick) gold deposition pattern. Electrical wiring to the connect terminals are of superconductor (NbTi). The thermal conductance to the thermal bath (i.e. mixing chamber of a dilution refrigerator) is made with thin nylon thread. The Si slab, the thermometer and the heater represent the addendum whose heat... 

Here we will report measurements on the heat capacity of two NTD Ge 34B wafers, one non-metallized (only doped and annealed) and the other metallized (by B+ implantation and Au deposition). The comparison of data obtained from the non-metallized NTD Ge wafer and from the wafer with electrical contacts revealed an excess heat capacity, which can be attributed to the implantation process with B ions [44],... 

Fig. 12.16. Heat capacity per unit volume of the two neutron transmutation doped (NTD) Ge wafers.

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