# US 2024/0200211 A1 · Electrode catalyst composite containing 2d transition metal chalcogenide material for water electrolysis and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2024/0200211 A1 - Document ID: US20240200211A1 - Status: Published application - Kind: A1 - Application number: 18/539,661 - Filed: 2023-12-14 - Published: 2024-06-20 - Earliest claimed: 2022-12-15 - Assignees: Research & Business Foundation Sungkyunkwan University - Applicants: Research & Business Foundation Sungkyunkwan University - Inventors: Jung Kyu KIM; Min Cheol KIM; Won SO; Jae Kyum KIM; Ho Seok PARK - Web page: https://patentgrep.com/patent/US20240200211A1 ## CPC - C25B 11/065: Carbon - C25B 1/04: by electrolysis of water - C25B 11/057: consisting of a single element or compound - C25B 11/075: consisting of a single catalytic element or catalytic compound - C25B 11/091: consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds - Y02E 60/36: Hydrogen production from non-carbon containing sources, e.g. by water electrolysis - C25B: ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR (anodic or cathodic protection C23F13/00; single-crystal growth C30B) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract An embodiment of the present invention provides an electrocatalyst composite including a 2D transition metal chalcogenide material for water electrolysis and a method for manufacturing the same. According to one embodiment of the present invention, the electrocatalyst composite for water electrolysis is manufactured by hetero-junctioning 2D nickel cobalt sulfide (NiCo2S4) and 2D rhenium sulfide (ReS2) to allow for high activity and application over a broad pH range during water electrolysis. ## Claims ### Claim 1 An electrocatalyst composite for water electrolysis, the composite comprising: a carbon substrate; a first transition metal chalcogenide layer comprising 2-dimensional first transition metal chalcogenide nanoparticles, positioned on the carbon substrate; and a second transition metal chalcogenide layer comprising 2-dimensional second transition metal chalcogenide nanoparticles, positioned on the first transition metal chalcogenide layer, wherein the first and second transition metal chalcogenide layers are hetero-junctioned. ### Claim 2 (depends on 1) The composite of claim 1, wherein the first and second transition metal chalcogenide layers are hetero-junctioned to allow electron transfer from the first transition metal chalcogenide layer to the second transition metal chalcogenide layer. ### Claim 3 (depends on 1) The composite of claim 1, wherein the first transition metal chalcogenide layer comprises a metal sulfide comprising one or more metals selected from the group consisting of nickel, cobalt, calcium, magnesium, manganese, iron, copper, zinc, lithium, and aluminum, and sulfur. ### Claim 4 (depends on 1) The composite of claim 1, wherein the second transition metal chalcogenide layer comprises molybdenum sulfide, tungsten sulfide, molybdenum selenide, tungsten selenide, molybdenum telluride, manganese selenide, hafnium sulfide, iridium sulfide, niobium sulfide, niobium selenide, tantalum sulfide, tantalum selenide, titanium sulfide, titanium selenide, zirconium sulfide, rhenium selenide, or rhenium telluride. ### Claim 5 (depends on 1) The composite of claim 1, being used as electrode catalyst for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). ### Claim 6 (depends on 1) The composite of claim 1, exhibiting catalytic activity in a solution with a pH range of 1 to 14. ### Claim 7 (depends on 1) The composite of claim 1, wherein the carbon substrate comprises one or more selected from the group consisting of carbon cloth, carbon fiber paper, carbon foam, and carbon paper. ### Claim 8 (depends on 1) The composite of claim 1, wherein the first transition metal chalcogenide layer has a thickness of 20 nm to 50 nm. ### Claim 9 (depends on 1) The composite of claim 1, wherein the second transition metal chalcogenide layer has a thickness of 5 nm to 30 nm. ### Claim 10 (depends on 1) A method of manufacturing the electrocatalyst composite for water electrolysis of claim 1, the method comprising: forming a first transition metal layer on a carbon substrate; forming a first transition metal chalcogenide layer by performing a sulfidation reaction on the first transition metal layer; and forming a second transition metal chalcogenide layer by performing hydrothermal synthesis on the first transition metal chalcogenide layer. ### Claim 11 (depends on 10) The method of claim 10, wherein the first transition metal layer comprises a layered double hydroxide (LDH) nanosheet comprising one or more selected from the group consisting of nickel, cobalt, calcium, magnesium, manganese, iron, copper, zinc, lithium, and aluminum. ### Claim 12 (depends on 10) The method of claim 10, wherein the first transition metal chalcogenide layer comprises a metal sulfide comprising one or more metals selected from the group consisting of nickel, cobalt, calcium, magnesium, manganese, iron, copper, zinc, lithium, and aluminum, and sulfur. ### Claim 13 (depends on 10) The method of claim 10, wherein the second transition metal chalcogenide layer comprises one or more selected form the group consisting of 2-dimensional rhenium disulfide, molybdenum sulfide, tungsten sulfide, molybdenum selenide, tungsten selenide, molybdenum telluride, manganese selenide, hafnium sulfide, iridium sulfide, niobium sulfide, niobium selenide, tantalum sulfide, tantalum selenide, titanium sulfide, titanium selenide, zirconium sulfide, rhenium selenide, and rhenium telluride.