| 摘要 |
1,209,753. Accumulator charge control electrode with organic catalysts. ROBERT BOSCH G.m.b.H. 27 Oct., 1967 [28 Oct., 1966], No. 48907/67. Heading H1B. In a gastight electrical accumulator operating on an oxygen cycle (i.e. having excess capacity in the negative electrode when charging), a porous control electrode responsive to oxygen contains as active component an organic catalyst, a reduced form of which is oxidized in situ by oxygen to an electrochemically reducible form, and carbon to render the electrode conductive. Organic catalysts described include condensates of aldehydes with quinoneforming dihydric phenols, or with certain dyestuffs, e.g. triphenylmethane or phthalein series vat dyes, or with a phenol in the presence of such dyes, and also metal phthalocyanines and metal porphyrins. In examples electrodes are prepared (i) from acetylene black and graphite, mixed with hydroquinone, phenol, pphenolsulphonic acid, water and formalin then with a fume silica and petrol, the mixture being moulded and cured; and (ii) from cobalt phthalocyanine precipitated from H 2 SO 4 by water into the pores of a carbon filter. The current and potential arising between these electrodes, partly immersed in the electrolyte of a lead-acid battery, and the negative electrode is observed during charging. Preferably the external switching circuit is adjusted to prevent the current from the negative pole of the cell to the control electrode from exceeding 1 mA. when the potential difference is below 400 mV. |
