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    특별초청 세미나

    미래를 창조하는 포스텍 화학공학과

    High Throughput Study of Alloy Surface Science and Catalysis

    일자
    2017.7.13 (목) 5:00PM
    연사
    Andrew J. Gellman
    소속
    Carnegie Mellon University
    Abstract
     
    One of the key challenges to systematic study of the composition dependence of the properties of multicomponent alloys is the need for experimental methods and simulation strategies that span multi-dimensional composition spaces comprehensively.  We have addressed the experimental challenge by developing methods for preparation, characterization and property measurement on Composition Spread Alloy Films (CSAFs) (Figure 1, left).  These are thin alloy films deposited with lateral composition gradients such that an entire ternary composition space can be represented in a 1 cm2 thin film; AxByC1-x-y, x = 0 ® 1, y = 0 ® 1-x.  By using a suite of spatially resolved analytical tools the alloy’s physical characteristics (bulk composition, surface composition, electronic structure, phase, etc.) and its functional properties (catalytic activity, corrosion resistance, thermal conductivity, etc.) can be mapped across composition space (x, y).  The presentation will cover some of the methods and then illustrate their application to catalysis on AgxPd1-x alloys and corrosion passivation of AlxFeyNi1-x-y alloys. 
    Our studies of across alloy composition space have focused on correlating the electronic properties of alloys (d-band energies) with the barriers to elementary reaction steps extracted from reaction kinetics data.  Using H2-D2 exchange on AgxPd1-x alloys we have measured the activation barrier to dissociative adsorption of H2, , across alloy composition space and correlated this to the d-band energy.  This experimentally, tests the validity of the scaling relationships derived from electronic structure methods.
    Our study of AlxFeyNi1-x-y corrosion in dry and humid air maps the critical aluminum concentration at which these alloys are passivated against corrosion across alloy compositions, .  In addition, this study maps the regions in which the various mechanisms of alloy passivation and corrosion are active (Figure 1, right).  This yields by far the most comprehensive understanding of the influence of alloy composition on corrosion behavior yet obtained.