Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS<sub>2</sub>-Based Hydrogen Evolution Reaction Electrocatalyst
One of the methods to improve the performance of a heterogeneous electrocatalyst is the dispersion of a catalytic material on a suitable substrate. In this study, femtosecond laser ablation was used to prepare very rough but also ordered copper surfaces consisting of vertical, parallel ridges. Then,...
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2022-05-01
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| author | Ramūnas Levinas Asta Grigucevičienė Tadas Kubilius Aidas Matijošius Loreta Tamašauskaitė-Tamašiūnaitė Henrikas Cesiulis Eugenijus Norkus |
| author_facet | Ramūnas Levinas Asta Grigucevičienė Tadas Kubilius Aidas Matijošius Loreta Tamašauskaitė-Tamašiūnaitė Henrikas Cesiulis Eugenijus Norkus |
| author_sort | Ramūnas Levinas |
| collection | DOAJ |
| description | One of the methods to improve the performance of a heterogeneous electrocatalyst is the dispersion of a catalytic material on a suitable substrate. In this study, femtosecond laser ablation was used to prepare very rough but also ordered copper surfaces consisting of vertical, parallel ridges. Then, a molybdenum sulfide coating was electrochemically deposited onto these surfaces. It was observed by profilometry that the average roughness of the surface after coating with MoS<sub>2</sub> had decreased, but the developed surface area still remained significantly larger than the projected surface area. The electrodes were then used as an electrocatalyst for the hydrogen evolution reaction in acidic media. These were highly efficient, reaching 10 mA cm<sup>−2</sup> of HER current at a −181 mV overpotential and a Tafel slope of ~39 mV dec<sup>−1</sup>. Additionally, scanning electrochemical microscopy was used to observe whether hydrogen evolution would preferentially occur in certain spots, for example, on the peaks, but the obtained results suggest that the entire surface is active. Finally, the electrochemical impedance spectroscopy data showed the difference in the double-layer capacitance between the ablated and non-ablated surfaces (up to five times larger) as well as the parameters that describe the improved catalytic activity of fs-Cu/MoS<sub>2</sub> electrodes. |
| first_indexed | 2024-03-10T01:08:11Z |
| format | Article |
| id | doaj.art-4303dcb6c48b48d1a007da161026c11b |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T01:08:11Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-4303dcb6c48b48d1a007da161026c11b2023-11-23T14:22:27ZengMDPI AGMaterials1996-19442022-05-011511392610.3390/ma15113926Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS<sub>2</sub>-Based Hydrogen Evolution Reaction ElectrocatalystRamūnas Levinas0Asta Grigucevičienė1Tadas Kubilius2Aidas Matijošius3Loreta Tamašauskaitė-Tamašiūnaitė4Henrikas Cesiulis5Eugenijus Norkus6State Research Institute Center for Physical Sciences and Technology (FTMC), Saulėtekio Ave. 3, LT-10257 Vilnius, LithuaniaState Research Institute Center for Physical Sciences and Technology (FTMC), Saulėtekio Ave. 3, LT-10257 Vilnius, LithuaniaHydrogen Solutions Ltd., Partizanų Str. 61-806, LT-49282 Kaunas, LithuaniaLaser Research Center, Vilnius University, Saulėtekio Ave. 10, LT-10223 Vilnius, LithuaniaState Research Institute Center for Physical Sciences and Technology (FTMC), Saulėtekio Ave. 3, LT-10257 Vilnius, LithuaniaFaculty of Chemistry and Geosciences, Vilnius University, Naugarduko Str. 24, LT-03225 Vilnius, LithuaniaState Research Institute Center for Physical Sciences and Technology (FTMC), Saulėtekio Ave. 3, LT-10257 Vilnius, LithuaniaOne of the methods to improve the performance of a heterogeneous electrocatalyst is the dispersion of a catalytic material on a suitable substrate. In this study, femtosecond laser ablation was used to prepare very rough but also ordered copper surfaces consisting of vertical, parallel ridges. Then, a molybdenum sulfide coating was electrochemically deposited onto these surfaces. It was observed by profilometry that the average roughness of the surface after coating with MoS<sub>2</sub> had decreased, but the developed surface area still remained significantly larger than the projected surface area. The electrodes were then used as an electrocatalyst for the hydrogen evolution reaction in acidic media. These were highly efficient, reaching 10 mA cm<sup>−2</sup> of HER current at a −181 mV overpotential and a Tafel slope of ~39 mV dec<sup>−1</sup>. Additionally, scanning electrochemical microscopy was used to observe whether hydrogen evolution would preferentially occur in certain spots, for example, on the peaks, but the obtained results suggest that the entire surface is active. Finally, the electrochemical impedance spectroscopy data showed the difference in the double-layer capacitance between the ablated and non-ablated surfaces (up to five times larger) as well as the parameters that describe the improved catalytic activity of fs-Cu/MoS<sub>2</sub> electrodes.https://www.mdpi.com/1996-1944/15/11/3926femtosecond laserhydrogen evolutionelectrocatalysismolybdenum sulfidescanning electrochemical microscopyelectrochemical impedance spectroscopy |
| spellingShingle | Ramūnas Levinas Asta Grigucevičienė Tadas Kubilius Aidas Matijošius Loreta Tamašauskaitė-Tamašiūnaitė Henrikas Cesiulis Eugenijus Norkus Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS<sub>2</sub>-Based Hydrogen Evolution Reaction Electrocatalyst Materials femtosecond laser hydrogen evolution electrocatalysis molybdenum sulfide scanning electrochemical microscopy electrochemical impedance spectroscopy |
| title | Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS<sub>2</sub>-Based Hydrogen Evolution Reaction Electrocatalyst |
| title_full | Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS<sub>2</sub>-Based Hydrogen Evolution Reaction Electrocatalyst |
| title_fullStr | Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS<sub>2</sub>-Based Hydrogen Evolution Reaction Electrocatalyst |
| title_full_unstemmed | Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS<sub>2</sub>-Based Hydrogen Evolution Reaction Electrocatalyst |
| title_short | Femtosecond Laser-Ablated Copper Surface as a Substrate for a MoS<sub>2</sub>-Based Hydrogen Evolution Reaction Electrocatalyst |
| title_sort | femtosecond laser ablated copper surface as a substrate for a mos sub 2 sub based hydrogen evolution reaction electrocatalyst |
| topic | femtosecond laser hydrogen evolution electrocatalysis molybdenum sulfide scanning electrochemical microscopy electrochemical impedance spectroscopy |
| url | https://www.mdpi.com/1996-1944/15/11/3926 |
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