Back to Search
Start Over
Ligand-regulated Ni-based coordination compounds to promote self-reconstruction for improved oxygen evolution reaction.
- Source :
- Journal of Materials Chemistry A; 8/7/2024, Vol. 12 Issue 29, p18294-18303, 10p
- Publication Year :
- 2024
-
Abstract
- Ni-based coordination compounds, during the oxygen evolution reaction (OER), self-reconstruct to produce NiOOH, which are the real active sites. Thus, encouraging the self-reconstruction of pre-catalysts to generate more NiOOH species has emerged as an effective strategy for enhancing the activity. In this research, we utilized three coordination compounds, Ni(N(CN)<subscript>2</subscript>)<subscript>2</subscript>, Ni(NCN), and Ni(HNCN)<subscript>2</subscript>, to examine the effect of three distinct ligands (–N(CN)<subscript>2</subscript>–, –HNCN–, and –NCN–) on the local electronic structure of coordinated Ni, aiming to promote the degree of self-reconstruction during the OER. XPS studies and in situ Raman spectroscopy revealed a significant relationship between the electron-donating properties of coordinated Ni and the self-reconstruction abilities of the pre-catalysts. Notably, Ni coordinated with –N(CN)<subscript>2</subscript>– exhibits a high tendency to donate electrons, leading to facile reconstruction of Ni(N(CN)<subscript>2</subscript>)<subscript>2</subscript> into Ni(OOH)–(N(CN)<subscript>2</subscript>). As a result, Ni(OOH)–(N(CN)<subscript>2</subscript>) displays high OER activity (264 mV @ 10 mA cm<superscript>−2</superscript> and Tafel slope of 40.80 mV dec<superscript>−1</superscript>) in comparison to Ni(OOH)–(NCN) (290 mV @ 10 mA cm<superscript>−2</superscript> and Tafel slope of 55.63 mV dec<superscript>−1</superscript>) and Ni(OOH)–(HNCN) (307 mV @ 10 mA cm<superscript>−2</superscript> and Tafel slope of 77.70 mV dec<superscript>−1</superscript>). These findings offer new perspectives on designing and developing innovative catalysts to enhance OER efficiency. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 12
- Issue :
- 29
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 178594601
- Full Text :
- https://doi.org/10.1039/d4ta03086a