Mass transport in nanoarray monolithic catalysts: An experimental-theory study

Electrocatalyst design for the conversion of energy molecules: electronic state modulation and mass transport regulation

“…109 Therefore, the study of mass transport kinetics is beneficial to the development of high-performance electrocatalysts. 104,110,111…”

“…[101][102][103] Effective mass transport represents rapid absorption and desorption step at active sites, which not only require suitable adsorption energy between reactants and various reaction intermediates, but also splendid mass transfer channels. [103][104][105] Although numerous methods have been employed to exploit efficient catalysts, it is still a rigorous challenge to develop a catalyst with efficient mass transfer capability. [106][107][108] Considering the restrictions of mass transport in heterogeneous electrocatalysis, we review the kinetic mechanism and optimization strategy of mass transport in the design of electrocatalysts.…”

“…Due to the presence of mass transport limitation, the electrode reaction frequently shows the kinetic characteristics of the mass transport step, instead of the reaction kinetic characteristics. 104,109 For example, the Tafel slope of HER catalyzed on some catalyst is B120 dec À1 in an acidic medium, reflecting mass transfer limitation rather than the reaction kinetic limitation as the Volmer step must occur under acidic conditions. 109 Therefore, the study of mass transport kinetics is beneficial to the development of high-performance electrocatalysts.…”

“…109 Therefore, the study of mass transport kinetics is beneficial to the development of high-performance electrocatalysts. 104,110,111 For electrocatalytic reactions, there are three main forms of mass transport between the electrolyte and catalyst layer: convection, diffusion and electromigration. 104,112 In the absence of external agitation, concentration gradient and temperature gradient are the main forces of convection and diffusion, while applied electric field causes electromigration of the dot particles.…”

Synergistic promotion of transition metal ion-exchange in TiO2 nanoarray-based monolithic catalysts for the selective catalytic reduction of NOx with NH3

“…8,[13][14][15][16] Meanwhile, SCR catalysts are usually supported on other materials, such as Al 2 O 3 , TiO 2 , carbon and ceramic monoliths, 17 etc., to achieve an optimal SCR performance. 18 Among these support materials, TiO 2 is less acidic and offers excellent dispersion of active components and SO 2 resistance; therefore, it has been widely used in NH 3 -SCR catalysts. 13,[19][20][21] Moreover, layered protonated titanates (LPTs, H 2 Ti 2 O 5 •H 2 O) are the precursors of TiO 2 and were reported as the ideal support materials due to their high surface area and abundant ion-exchangeable sites.…”