Silver oxide, basic-strength

Tetraalkylammonium salts, e.g. R4N I , are known, on treatment with moist silver oxide, AgOH, to yield basic solutions comparable in strength with the mineral alkalis. This is readily understandable for the base so obtained, R4N eOH, is bound to be completely ionised as there is no possibility, as with tertiary amines, etc.,... 

Basic Strength of Silver Oxide. Collect on a filter the silver oxide precipitate obtained in (6) of the last experiment. Wash it thoroughly with hot water. Put part of the moist residue on a piece of red litmus paper and note that the paper is turned blue. Pour 2 cc. of water over the rest of the brown... 

The brown silver oxide must combine with water to form the hydroxide when it dissolves because of the tests for Ag+ and OH-ions that are obtained in the solution. Silver oxide is thus shown to be appreciably soluble and markedly basic. As would be expected of salts of such a base, we find that silver nitrate and silver sulphate are not hydrolyzed. Silver oxide is exceptional for a heavy metal oxide in displaying so marked a basic strength. 

Further studies of various MPc (M = Fe, Co, Ni, and Mn) on Ag/C in RDE and AEMFCs indicate that the benefits of MPc molecules for enhanced ORR activity on Ag/C catalysts depend not only on their interactions with the Ag surface but also their bonding strength with the OH species [42]. The basic CV curves obtained on the Ag/C and various MPc-modified Ag/C catalysts are shown in Fig. 15.24. The peak currents on the FePc Ag/C, MnPc Ag/C, and CoPc Ag/C catalysts were significantly higher than those on the NiPc Ag/C or Ag/C catalysts, which implies that there may be more active sites available for oxidization on the silver nanoparticles when the silver surface was modified with MnPc, FePc, or CoPc molecules. The anodic peaks of silver on the NiPc(S> Ag/C catalyst were very similar to those observed on the Ag/C catalyst Based on the enhancement of the Ag anode peak currents, the interaction strength between the silver nanoparticles and the MPc molecules was found to follow this trend FePc/Ag > MnPc/Ag > CoPc/Ag >> NiPc/Ag, which seems to agree reasonably with the DFT calculation results listed in Table 15.2 [48]. 

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