Developing Advanced Oxygen Electrocatalysts for Zinc-Air Batteries: from Morphology Control to Atom-Level Electronic Structure Manipulation
Xia Wang
Department of Chemistry and Food Chemistry, TU Dresden

Sept. 30, 2021, 1 p.m.
https://tinyurl.com/nanoSeminar-GA


Oxygen electrocatalysts for OER and ORR are of great significance to determine the charge/discharge kinetics and energy efficiency of zinc-air batteries (ZABs). As a result, extensive research has been devoted to explore novel electrocatalysts and improve their activity for high performance ZABs. In my PhD topics, I developed a confined growth method for synthesizing porous N-doped cobalt oxide nanoarrays on carbon cloth (NP-Co3O4/CC). This method can effectively confine the growth of cobalt oxides, producing ultrafine Co3O4 nanocrystals with abundant exposed surface-active sites. Simultaneously, the Co- N bonds in Co-ZIF are introduced into cobalt oxide lattices, unprecedentedly realizing the low-temperature N doping of cobalt oxides (200 oC). As a result, the as-fabricated NP-Co3O4/CC-based ZABs manifest excellent performance with a very low voltage gap, ultralong cycle life, and an extremely large peak power density. Furthermore, I have developed the first BP-based metal-free bifunctional oxygen electrocatalyst by covalently bonding BP with graphitic carbon nitride (denoted BP-CN-c). The BP-CN-c catalyst presents a high OER and ORR activity. DFT calculations corroborated the vital role of interfacial P-N bonds in regulating the electron redistribution at the heterointerfaces and thus further enhance the OOH* chemisorption capability and chemical stability. Therefore, BP- CN-c based ZAB reached a high peak power density. I also developed a Zr-based single atom catalyst (Zr-N-C) for ORR because of the unique configuration and maximum atom utilization efficiency of SACs. The Zr-N-C displays a halfwave potential of 0.91V and excellent long-term durability of 92% retention after 130 h continuous operation. The Zr-N-C delivered a record high power density of 324 mW cm−2.

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Developing Advanced Oxygen Electrocatalysts for Zinc-Air Batteries: from Morphology Control to Atom-Level Electronic Structure Manipulation
Xia Wang
Department of Chemistry and Food Chemistry, TU Dresden

Sept. 30, 2021, 1 p.m.
https://tinyurl.com/nanoSeminar-GA


Oxygen electrocatalysts for OER and ORR are of great significance to determine the charge/discharge kinetics and energy efficiency of zinc-air batteries (ZABs). As a result, extensive research has been devoted to explore novel electrocatalysts and improve their activity for high performance ZABs. In my PhD topics, I developed a confined growth method for synthesizing porous N-doped cobalt oxide nanoarrays on carbon cloth (NP-Co3O4/CC). This method can effectively confine the growth of cobalt oxides, producing ultrafine Co3O4 nanocrystals with abundant exposed surface-active sites. Simultaneously, the Co- N bonds in Co-ZIF are introduced into cobalt oxide lattices, unprecedentedly realizing the low-temperature N doping of cobalt oxides (200 oC). As a result, the as-fabricated NP-Co3O4/CC-based ZABs manifest excellent performance with a very low voltage gap, ultralong cycle life, and an extremely large peak power density. Furthermore, I have developed the first BP-based metal-free bifunctional oxygen electrocatalyst by covalently bonding BP with graphitic carbon nitride (denoted BP-CN-c). The BP-CN-c catalyst presents a high OER and ORR activity. DFT calculations corroborated the vital role of interfacial P-N bonds in regulating the electron redistribution at the heterointerfaces and thus further enhance the OOH* chemisorption capability and chemical stability. Therefore, BP- CN-c based ZAB reached a high peak power density. I also developed a Zr-based single atom catalyst (Zr-N-C) for ORR because of the unique configuration and maximum atom utilization efficiency of SACs. The Zr-N-C displays a halfwave potential of 0.91V and excellent long-term durability of 92% retention after 130 h continuous operation. The Zr-N-C delivered a record high power density of 324 mW cm−2.

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