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Interfacial Engineering of MoS 2 @CoS 2 Heterostructure Electrocatalysts for Effective pH-Universal Hydrogen Evolution Reaction.
- Source :
-
Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2024 May 21; Vol. 40 (20), pp. 10518-10525. Date of Electronic Publication: 2024 May 08. - Publication Year :
- 2024
-
Abstract
- The practical utilization of the hydrogen evolution reaction (HER) necessitates the creation of electrocatalysts that are both efficient and abundant in earth elements, capable of operating effectively within a wide pH range. However, this objective continues to present itself as an arduous obstacle. In this research, we propose the incorporation of sulfur vacancies in a novel heterojunction formed by MoS <subscript>2</subscript> @CoS <subscript>2</subscript> , designed to exhibit remarkable catalytic performances. This efficacy is attributed to the advantageous combination of the low work function and space charge zone at the interface between MoS <subscript>2</subscript> and CoS <subscript>2</subscript> in the heterojunction. The MoS <subscript>2</subscript> @CoS <subscript>2</subscript> heterojunction manifests outstanding hydrogen evolution activity over an extensive pH range. Remarkably, achieving a current density of 10 mA cm <superscript>-2</superscript> in aqueous solutions 1.0 M KOH, 0.5 M H <subscript>2</subscript> SO <subscript>4</subscript> , and 1.0 M phosphate-buffered saline (PBS), respectively, requires only an overpotential of 48, 62, and 164 mV. The Tafel slopes for each case are 43, 32, and 62 mV dec <superscript>-1</superscript> , respectively. In this study, the synergistic effect of MoS <subscript>2</subscript> and CoS <subscript>2</subscript> is conducive to electron transfer, making the MoS <subscript>2</subscript> @CoS <subscript>2</subscript> heterojunction show excellent electrocatalytic performance. The synergistic effects arising from the heterojunction and sulfur vacancy not only contribute to the observed catalytic prowess but also provide a valuable model and reference for the exploration of other efficient electrocatalysts. This research marks a significant stride toward overcoming the challenges associated with developing electrocatalysts for practical hydrogen evolution applications.
Details
- Language :
- English
- ISSN :
- 1520-5827
- Volume :
- 40
- Issue :
- 20
- Database :
- MEDLINE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Publication Type :
- Academic Journal
- Accession number :
- 38719232
- Full Text :
- https://doi.org/10.1021/acs.langmuir.4c00121