US 12,435,432 B2
Bismuth-based modified electrode, manufacturing method thereof and use thereof
Chia-yu Lin, Tainan (TW); Chia-sheng Su, Tainan (TW); Chia-hui Yen, Tainan (TW); Shih-ching Huang, Tainan (TW); and Wei-hsin Lu, Tainan (TW)
Assigned to National Cheng Kung University, Tainan (TW)
Filed by NATIONAL CHENG KUNG UNIVERSITY, Tainan (TW)
Filed on Sep. 22, 2022, as Appl. No. 17/934,541.
Claims priority of application No. 111125035 (TW), filed on Jul. 4, 2022.
Prior Publication US 2024/0003025 A1, Jan. 4, 2024
Int. Cl. C25B 11/00 (2021.01); C23C 18/16 (2006.01); C23C 28/00 (2006.01); C25B 3/09 (2021.01); C25B 3/29 (2021.01); C25B 11/052 (2021.01); C25B 11/061 (2021.01); C25B 11/091 (2021.01); C25D 11/00 (2006.01)
CPC C25B 11/091 (2021.01) [C23C 18/1637 (2013.01); C23C 18/1646 (2013.01); C23C 28/00 (2013.01); C25B 3/09 (2021.01); C25B 3/295 (2021.01); C25B 11/052 (2021.01); C25B 11/061 (2021.01); C25D 11/00 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of manufacturing a bismuth-based modified electrode, comprising a step of:
immersing a copper substrate in an aqueous solution for 1 to 20 minutes to obtain the bismuth-based modified electrode;
wherein the aqueous solution comprises a bismuth solution and KI solution, and a concentration of the KI solution ranges from 0.4 M to 3.0 M, and the bismuth solution comprises bismuth nitrate, bismuth carbonate, bismuth acetate, or bismuth citrate, and a concentration of the bismuth nitrate, a concentration of the bismuth carbonate, a concentration of the bismuth acetate, and a concentration of the bismuth citrate range from 20 mM to 40 mM, respectively,
wherein the aqueous solution further comprises an oxidizing agent and the oxidizing agent comprises p-benzoquinone with a concentration between 0.5 mM and 50 mM, hydrogen peroxide with a concentration between 1 mM and 10 mM, or 2,2′-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) diammonium salt with a concentration between 1 mM and 10 mM; and
immersing the copper substrate in an electrolyte with a concentration of 0.1 M and a pH between 7.0 and 9.2, and performing an electrochemical reduction at an applied potential between −0.5 V and −1.75 V vs. NHE for 30 minutes to 2 hours,
wherein the electrolyte is selected from the group consisting of phosphate solution, borate solution, and carbonate solution.