Enhancing Electrochemical Activity

Xu, L., Ding, Y., Chen, C., Zhao, L., Rimkus, C., Joesten, R. and Suib, S.L. (2008) 3D flowerlike a-nickel hydroxide with enhanced electrochemical activity synthesized by microwave-assisted hydrothermal method. Chemistry of Materials, 20, 308-316. 

The first example addresses ruthenium-modified platinum electrodes, vsdiich show an enhanced electrochemical activity for the oxidation of H2/CO gas mixtures as compared with pure platinum [4, 5]. This makes them interesting electrocatalysts for low-temperature fuel cell applications. Here we discuss the mesoscopic structure of... 

Several strategies to increase the production of electron shuttles have been developed to improve the MFC performance in the model exoeleetrogens. For Shewanella species, flavins (riboflavin and flavin mononucleotide) are the most well-known self-secreted electron shuttles. Using deletion mutants lacking various Mtr-associated proteins, the significance of the Mtr extracellular respiratory pathway for the reduction of flavins has been demonstrated. The decaheme cytochromes found on the outer surface of the cell (MtrC and OmcA) are required for the majority of Mtr-associated proteins activity. Weakly acidic pH resulted in poor performance of the MFC and low riboflavin concentrations in the bacterial cultures, while enhanced electrochemical activity of riboflavin was reported at alkaline pH. The increase of riboflavin biosynthesis by Shewanella at the alkaline condition underlies the improvement in the electricity output in MFCs. ... 

Thus prepared layers have been further modified to develop electrocatalysts and sensors. Polypyridyl ruthenium-oxo complexes are of particular interest as efficient oxidants for a wide variety of organic molecules, including aromatic hydrocarbons, olefins, alcohols, and ketones. One such electrocatalyst was prepared by first electrografting bipyridine at an applied positive potential followed by treating the modified surface with [Ru tl2(DMSO)(terpyridine)] and then CFjSOjH/HjO [104]. Enhanced electrochemical activity has also been observed for the reduction of oxygen at anthraquinone-modified GC electrodes in 0.1 M KOH solution [105,... 

Sato, K., Abe, H., Misono, T., Murata, K., Fukui, T. Naito, M. Enhanced electrochemical activity and long-term stability of Ni YSZ anode derived from NiO-YSZ interdispersed composite particles. J. Europ. Ceramic Soc. 29 (2009), pp. 1119-1124. 

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