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Mohd Zafar Iqbal,Shahla Imteyaz,Chandan Ghanty,Santanu Sarkar 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.113 No.-
The current review discusses the recent advances in Ag-based electrocatalysts for electrocatalytic conversionof CO2 to CO. The comparable electrocatalytic activity, stability, and lower cost of the Ag-based catalystswith that of Au- and Pd-based catalysts make the former commercially more viable for theelectrochemical CO2 conversion to CO. The challenges associated with the electrochemical CO productionare discussed. The impacts of the surface composition, surface area, particle size, porosity, lattice edge,crystal plane, and the defects on the catalytic activity of the electrocatalyst are also reviewed. CO2 electrolysers,especially the membrane electrode assembly (MEA)-based electrolyser and its constituents, aredescribed. The infrastructure of the gas diffusion electrode (GDE) and development thereof was foundcritical for the microenvironment of the liquid–gas interface near the catalyst surface in a GDE-based systemto sustain a higher activity over a period of time still remains a challenge. Hence, pathways to cautiouslyproduce benchmark GDEs are discoursed. The role of different ion-exchange membranes and theassociated challenges are reviewed. In the end, perspectives on catalyst design and the electrochemicalCO2 reduction (eCO2R) to CO process are given to assist in further improving the electrocatalyticefficiency.
Erickson, Evan M.,Bouzaglo, Hana,Sclar, Hadar,Park, Kang-Joon,Lim, Byung-Beom,Schipper, Florian,Ghanty, Chandan,Grinblat, Judith,Markovsky, Boris,Sun, Yang-Kook,Aurbach, Doron The Electrochemical Society 2016 Journal of the Electrochemical Society Vol.163 No.7
<P>In this work, nickel-rich, layered-structure LiNi0.65Co0.08Mn0.27O2 cathode materials were synthesized and compared with materials of the same overall composition, but with a concentration gradient throughout the particles: the Ni concentration is higher at the center of the particles and lower at surface, while the opposite is true for the Mn concentration. The co-precipitation synthesis parameters were optimized, with two different annealing protocols for the final products and the effect of chelating agent concentration during synthesis examined. The gradientmaterials provided superior capacity and rate capability than their respective non-gradient-materials, at normal operating potentials and temperatures, e.g. 30 degrees C up to 4.3 V vs. Li. The reasons for the improved discharge capacity of the gradient materials were explored through impedance spectroscopy and post-mortem characterization. The gradient structure evolution was examined via TEM and electron diffraction measurements of particle cross-sections. Prolonged cycling, even at elevated temperatures, did not change the initial concentration profiles determined by the synthesis. Additionally, long-term cycling experiments of the second-generation material electrodes vs. graphite electrodes in full cells were performed in order to explore the practical advantage of these novel materials. (C) 2016 The Electrochemical Society. All rights reserved.</P>