Composite Pt/(SnO2/C) and PtSnNi/C Catalysts for Oxygen Reduction and Alcohol Electrooxidation Reactions

Russian Journal of Electrochemistry - The electrodeposition of tin and tin-nickel on a highly dispersed carbon material is used to obtain composite supports. These composite supports were used in...     

The study of the pyrolysis products of Ni (II) and Pd (II) chelate complexes as catalysts for the oxygen electroreduction reaction

Journal of Solid State Electrochemistry - Nitrogen-doped carbon materials were prepared by the pyrolysis of carbon black Vulcan XC-72 impregnated with nitrogen-containing Pd (II) and Ni (II)...     

Maps preserving zeros of matrix polynomials

We study non-linear maps on the set of n × n matrices over a field, which preserve the zeros of a fixed homogeneous multilinear polynomial. This solves Kaplansky-Watkins problem from 1976 about the structure of such transformations. Published in Russian in Doklady Akademii Nauk, 2009, Vol. 427, No. 3, pp. 300–302. Presented by Academician A.T. Fomenko December 8, 2008 The article was translated by the authors.     

On linear operators preserving the set of positive polynomials

Following the classical approach of Pólya-Schur theory [13] we initiate in this paper the study of linear operators acting on and preserving either the set of positive univariate polynomials or similar sets of non-negative and elliptic polynomials. To Vladimir Igorevich Arnold with admiration     

New matrix partial order based on spectrally orthogonal matrix decomposition

We investigate partial orders on the set of complex square matrices and introduce a new order relation based on spectrally orthogonal matrix decompositions. We also establish the relation of this concept with the known orders.     

Frobenius and Dieudonné theorems over semirings

We obtain semiring versions of classical theorems by Frobenius and Dieudonné on determinant, singularity, and non-singularity preservers.     

The relationship between activity and stability of deposited platinum-carbon electrocatalysts

The operation-mode stability and the catalytic activity in electrode reactions are the most important properties of electrocatalysts that determine the possibility of using them in fuel cells. The negative linear correlations between stability and catalytic activity of a series of Pt/C and Pt–Cu/C materials in the oxygen electroreduction reaction are revealed and studied. A method of selecting electrocatalysts with the optimal combination of activity and stability is proposed. The Cu@Pt/C catalysts containing bimetallic nanoparticles with the core–shell architecture which demonstrate the anomalously high combination of activity and stability are synthesized.     

Methanol Electrooxidation on PtM/C (M = Ni,Co) and Pt/(SnO2/C) Catalysts

Russian Journal of Electrochemistry - We investigate the activity of bimetallic PtM/C (M = Ni, Co) catalysts with different microstructures and platinum catalysts supported on a nanostructured...