Composition Engineered Electrocatalysts for Water Splitting and Metal-ion batteries

Abstract: Water electrolysis, fuel cells, and metal-air batteries all require efficient and cheap electrocatalysts that can significantly lower the reaction overpotentials. Defects due to doping or alloy are pivotal to tailoring the electrocatalytic activities of the electrode materials. In this talk, I will discuss the effect of composition engineering and doping of electrocatalysts in their performance in water splitting and meal-ion batteries. First, we show dual anion doping, or metal-anion co-doping in alloy compounds can simultaneously modulate key parameters in water dissociation and hydrogen adsorption energies, leading to evident enhancement in both hydrogen and oxygen evolution reaction activities. Second, local configurations in the basal plane of MoS2 due to atomic doping have triggered the intrinsic HER activity. Finally, some applications in high-power and durable zinc-air batteries will also be presented. Keywords: Water splitting, hydrogen generation reaction, electrocatalysts, metal-ion batteries, defect chemistry. Citation of Video Article Vid. Proc. Adv. Mater., Volume 2, Article ID 210180 (2021) Full Video Article www.proceedings.iaamonline.org/article/vpoam-2021-0180 0:00 Introduction 0:07 Our Research on Electrocatalysis 1:51 Electrochemical water splitting 5:12 HER in Acidic solution 5:42 HER in alkaline solution 8:10 Co/Ni Alloy as electrocatalysts 8:45 Metal-nonmetal dual doping in COP 10:33 Composition optimization 13:26 Intrinsic surface area effect 15:03 Post HER characterization 17:08 Fluorine - one stone two birds 21:20 Confirmation of dual defects 22:25 Enhanced HER in neutral electrolyte 23:56 Activation of Mos, basal plane 25:42 Local configuration in Mos, basal plane 34:38 Acknowledgement