Synthesis and Characteristics of Platinum Black

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platinum black is an electrochemically synthesized form of platinum metal. It has many unique properties which make it a useful material for applications in catalysis and microelectronic fabrication.

In contrast to bright platinum, the specific surface area of black platinum is much higher. This high surface area could be valuable for applications in catalysis such as the HER.

Moreover, platinum black is able to adsorb gas and can be used in catalysis. It also possesses excellent chemical stability and a low oxidation potential.

Synthesis of platinum black Using Aqueous Media

To synthesize platinum black in aqueous media, we adapted a method of Kohlrausch, who pioneered the electrochemical preparation of platinum black on platinum electrodes in 1897. In this method, a mixture of 0.1 g PtCl4 and 0.002 g Pb(CH3COO)2 in 10 mL water was used as an electrolytic bath.

Redox Stability of Black Platinum Threads

To study the electrochemical stability of the platinum-black coated threads, a K3[Fe(CN)6] redox probe was used at different scan rates. Typical cyclic voltammograms are shown in Fig. 3. In the range of 0.02-0.1 V/s, the current peak (Ip) and square root of the scan rate (CV) were found to be a good predictor of the stability of the threads.

The optimum loadings of ionomers for carbon-supported platinum catalyst and platinum black catalyst were 30 and 11 wt.%, respectively. The lower optimum binder loading for the platinum black catalyst was probably due to its higher density, compared to carbon-supported platinum catalyst.

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