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US 2024/0131501 A1Published application
Nanofiber electrocatalyst
AssigneeUchicago Argonne, LLC
InventorsDi-Jia Liu, Lina Chong
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Abstract
A nanofibrous catalyst for in the electrolyzer and methods of making the catalyst. The catalysts are composed of highly porous transition metal carbonitrides, metal oxides or perovskites derived from the metal-organic frameworks and integrated into a 3D porous nano-network electrode architecture. The catalysts are low-cost, highly active toward OER, with excellent conductivity yet resistant to the oxidation under high potential operable under both acidic and alkaline environments.
Claims16
A nanofiber catalyst comprising:
- a transition metal oxide fibrous material comprising a plurality of pores, wherein:
- the transition metal oxide fibrous material has metal oxide framework (MOF) morphology filled by metal oxide particles, the transition metal oxide fibrous material being a bimetallic or trimetallic transition metal oxide;
- and
- the transition metal oxide particles are connected by interconnected metal oxide structure to form nanofibrous network;
- wherein the catalyst has a specific surface area of 100-1000 m2/gram.
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A method comprising:
- forming a mixture of metal organic framework crystals suspended in a polymer solution;
- electrospinning the metal organic framework crystals and polymer mixture, forming porous and interconnected nanofibers having metal organic framework crystals uniformly dispersed;
- and
- subjecting the metal organic framework containing porous nanofiber to sequential thermolysis, forming catalytic nanofibers with uniformly distributed catalytic sites;
- wherein the thermolysis comprises a first thermal conversion at a temperature between 250° C. and 500° C. under an oxidizing environment for a first period of time of 30 minutes to 10 hours to form metal oxide.
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Dependencies are inferred from the claim text.