Micro-electrochemical studies were made of H storage materials by using a micro-electrode technique. A C-fibre filament was placed in contact with single particles of the alloys, in 1M KOH solution, by using a micromanipulator. In this way, cyclic voltammetric, potential step experiments and  in situ  X-ray diffraction experiments could be carried out. The current responses were recorded as a function of time were analyzed by using a spherical diffusion model. The room-temperature diffusivity was 1.1 x 10-9 cm2/s.T.Nishina, H.Ura, I.Uchida: Journal of the Electrochemical Society, 1997, 144[4], 1273-8

Table 201

Diffusion of Co in Ni-Ge Alloys

 

Ge

Temperature (K)

D (cm2/s)

0.008

1333

2.17 x 10-11

0.023

1333

2.59 x 10-11

0.034

1333

3.16 x 10-11

0.036

1333

3.67 x 10-11

0.048

1333

4.76 x 10-11

0.079

1333

8.18 x 10-11

0.008

1380

5.91 x 10-11

0.023

1380

7.61 x 10-11

0.042

1380

1.16 x 10-10

0.066

1389

1.43 x 10-10

0.079

1380

2.00 x 10-10

0.008

1418

1.20 x 10-10

0.023

1418

1.37 x 10-10

0.034

1418

1.51 x 10-10

0.048

1418

1.98 x 10-10

0.066

1418

2.41 x 10-10

0.080

1418

3.05 x 10-10

0.009

1471

2.34 x 10-10

0.023

1471

2.64 x 10-10

0.034

1471

2.76 x 10-10

0.048

1471

3.20 x 10-10

0.055

1471

3.60 x 10-10

0.077

1471

4.50 x 10-10