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S-Doped Ni(OH)2 nano-electrocatalyst confined in semiconductor zeolite with enhanced oxygen evolution activity.
- Source :
- Journal of Materials Chemistry A; 6/14/2020, Vol. 8 Issue 22, p11255-11260, 6p
- Publication Year :
- 2020
-
Abstract
- Low-cost Ni(OH)<subscript>2</subscript>-based nanomaterials with various structures and morphologies are promising catalysts for efficient oxygen evolution reactions (OERs). However, homogenous Ni(OH)<subscript>2</subscript> nanomaterials with abundant active sites suffer from low conductivity and easy aggregation, resulting in low catalytic activity and stability. Here, we report a new synthetic method capable of generating abundant and confined S-doped β-Ni(OH)<subscript>2</subscript> nanoparticles (NPs) (3–5 nm) within a 3D semiconductor substrate, metal-chalcogenide semiconductor zeolite (CSZ). This method operates via sequential fluoride-assisted cationic stripping and in situ Ni(OH)<subscript>2</subscript> generation and is demonstrated here as an effective method to synthesize Ni<superscript>2+</superscript>-containing CSZ that are known to defy direct synthesis. The resulting composite (denoted Ni(OH)<subscript>2</subscript> NPs@CSZ) exhibited excellent OER performance with a very low overpotential of only 212 mV at a current density of 10 mA cm<superscript>−2</superscript> in O<subscript>2</subscript>-saturated 1 M KOH solution, and low Tafel slope of 64.2 mV dec<superscript>−1</superscript>, which is superior to that of benchmark IrO<subscript>2</subscript>. DFT calculations indicate that the interaction between the embedded Ni(OH)<subscript>2</subscript> NPs and the dopant, S<superscript>2−</superscript>, from the host CSZ played a crucial role in improving OER performance. This work provides a new path for developing high-performance Ni(OH)<subscript>2</subscript>-based OER catalysts and may also serve as a general approach for loading large amounts of other catalytically active NPs into semiconducting open frameworks to further optimize electrocatalytic performance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 8
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 143698521
- Full Text :
- https://doi.org/10.1039/d0ta00547a