Hydrogen evolution electrode and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2023203675-A1
Application number	US-202218056527-A
Country	US
Kind code	A1
Filing date	Nov 17, 2022
Priority date	Dec 29, 2021
Publication date	Jun 29, 2023
Grant date	—

Abstract

The present disclosure provides a hydrogen evolution electrode and a preparation method thereof. The preparation method includes the following steps: providing an electrolyte including Co(NO3)2·6H2O with a Co(NO3)2 concentration of 0.005 mol L−1 to 0.015 mol L−1, MnCl2·4H2O with a MnCl2 concentration of 0.005 mol L−1 to 0.01 mol L−1, KCl with a concentration of 0.003 mol L−1 to 0.008 mol L−1, and CH3CSNH2 with a concentration of 0.04 mol L−1 to 0.06 mol L−1; adjusting the electrolyte to a pH value of 6 to 7; providing a cathode in the form of a substrate; and conducting electrolysis in a cyclic voltammetry mode, thereby preparing the electrode for hydrogen production by water electrolysis through electrochemical deposition of a Co9-xMnxS8 nanosheet catalyst on the cathode substrate, where 1≤X≤7.

First claim

1 . A preparation method of an electrode for hydrogen production by water electrolysis, comprising the following steps:
providing an electrolyte comprising Co(NO 3 ) 2 ·6H 2 O with a Co(NO 3 ) 2 concentration of 0.005 mol L −1 to 0.015 mol L −1 , MnCl 2 ·4H 2 O with a MnCl 2 concentration of 0.005 mol L −1 to 0.01 mol L −1 , KCl with a concentration of 0.003 mol L −1 to 0.008 mol L −1 , and CH 3 CSNH 2 with a concentration of 0.04 mol L −1 to 0.06 mol L −1 ; adjusting the electrolyte to a pH value of 6 to 7; providing a cathode in a substrate form; and conducting electrolysis in a cyclic voltammetry mode, thereby preparing the electrode for hydrogen production by water electrolysis through electrochemical deposition of a Co 9-x Mn x S 8 nanosheet catalyst on the cathode substrate, wherein 1≤X≤7.

2 . The preparation method according to claim 1 , wherein the electrolysis is conducted in the cyclic voltammetry mode by scanning at a potential window of −1 V vs RHE to 1 V vs RHE and a scan rate of 1 mV s −1 to 3 mV s −1 with 5 to 7 scan segments.

3 . The preparation method according to claim 1 , wherein the electrolysis is conducted with the electrolyte at a constant temperature of 20° C. to 30° C. for 30 min to 40 min.

4 . The preparation method according to claim 1 , further comprising providing an anode that is spaced from the cathode by 2 cm to 5 cm.

5 . The production method according to claim 1 , wherein a titanium substrate is provided as the cathode.

6 . The preparation method according to claim 1 , wherein a thickness of the Co 9-x Mn x S 8 nanosheet is adjusted by controlling a molar ratio of Co and Mn in the electrolyte.

7 . The preparation method according to claim 6 , wherein Co and Mn in the electrolyte have a molar ratio of 1:1, namely X is 4.5.

8 . An electrode for hydrogen production by water electrolysis, prepared by the preparation method according to claim 1 .

9 . The electrode for hydrogen production by water electrolysis according to claim 8 , wherein the electrolysis is conducted in the cyclic voltammetry mode by scanning at a potential window of −1 V vs RHE to 1 V vs RHE and a scan rate of 1 mV s −1 to 3 mV s −1 with 5 to 7 scan segments.

10 . The electrode for hydrogen production by water electrolysis according to claim 8 , wherein the electrolysis is conducted with the electrolyte at a constant temperature of 20° C. to 30° C. for 30 min to 40 min.

11 . The electrode for hydrogen production by water electrolysis according to claim 8 , further comprising providing an anode that is spaced from the cathode by 2 cm to 5 cm.

12 . The electrode for hydrogen production by water electrolysis according to claim 8 , wherein a titanium substrate is provided as the cathode.

13 . The electrode for hydrogen production by water electrolysis according to claim 8 , wherein a thickness of the Co 9-x Mn x S 8 nanosheet is adjusted by controlling a molar ratio of Co and Mn in the electrolyte.

14 . The electrode for hydrogen production by water electrolysis according to claim 13 , wherein Co and Mn in the electrolyte have a molar ratio of 1:1, namely X is 4.5.

Assignees

• Univ Chongqing

Inventors

• Zhang Yunhuai
• Gao Di
• Xiao Peng

Classifications

• C25D3/562

  containing more than 50% by weight of iron or nickel or cobalt · CPC title

• C25D5/60

  Electroplating characterised by the structure or texture of the layers · CPC title

• C25D5/18

  Electroplating using modulated, pulsed or reversing current · CPC title

• C25B11/063

  Valve metal, e.g. titanium · CPC title

• C25B1/04 Primary

  by electrolysis of water · CPC title