Combinatorial high-throughput optical screening of high performance Pd alloy cathode for hybrid Li-air battery

Fluorophore Metal-Organic Complexes: High-Throughput Optical Screening for Aprotic Electrochemical Systems

Combinatorial optical screening of aprotic electrocatalysts has not yet been achieved primarily due to H⁺-associated mechanisms of fluorophore modulation. We have overcome this problem by using fluorophore metal-organic complexes. In particular, eosin Y and quinine can be coordinated with various metallic cations (e.g., Li⁺, Na⁺, Mg²⁺, Zn²⁺, and Al³⁺) in aprotic solvents, triggering changes in their fluorescent properties. These interactions have been used in a reliable screening method to determine oxygen reduction/evolution reaction activities of 100 Mn-based binary catalysts for the aprotic Li-air battery.

Exploring experimental fitness landscapes for chemical synthesis and property optimization

The topology of experimental fitness landscapes for chemical optimization objectives is assessed through svr-based HDMR modeling.

Screening of Novel Li-Air Battery Catalyst Materials by a Thin Film Combinatorial Materials Approach

A combinatorial synthesis and high-throughput screening process was developed for the investigation of potential oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts for use as Li-air battery cathode materials. Libraries of discrete ternary metal alloy compositions were deposited via thin-film sputtering. The samples were electrochemically tested in parallel using cyclic voltammetry in O2-saturated KOH electrolyte. Compositions were ranked by ORR and OER onset potentials with respect to an internal Pt reference. Results from the Pt-Mn-Co, Cr-Mn-Co, Pd-Mn-Co, and Pd-Mn-Ru systems are reported. Many alloy compositions showed marked improvement in catalytic activity compared to pure Pt. Among the systems considered, Pt12Mn44Co44, Pd43Co57 and Pd36Mn28Ru36 in particular exhibited lower overpotentials for oxygen reactions, which occur at the cathode in Li-air batteries.

Co3O4-based binder-free cathodes for lithium–oxygen batteries with improved cycling stability

A novel binder-free electrode for lithium–oxygen batteries has been prepared by electrodepositing a Co₃O₄ layer onto a pretreated TiO₂ fiber mesh formed on nickel foam by an electrospinning method.