DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Facile Synthesis of Rhodium‐Based Nanocrystals in a Metastable Phase and Evaluation of Their Thermal and Catalytic Properties

Journal Article · · Small Methods
ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1];  [3]; ORCiD logo [3]; ORCiD logo [4]
  1. School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta GA 30332 USA
  2. School of Materials Science and Engineering Georgia Institute of Technology Atlanta GA 30332 USA
  3. Center for Nanophase Materials Science Oak Ridge National Laboratory Oak Ridge TN 37831 USA
  4. School of Chemistry and Biochemistry Georgia Institute of Technology Atlanta GA 30332 USA, The Wallace H. Coulter Department of Biomedical Engineering Georgia Institute of Technology and Emory University Atlanta GA 30332 USA

Abstract Controlling the polymorphism of metal nanocrystals is a promising strategy for enhancing properties and discovering new phenomena. However, previous studies on Rh nanocrystals have focused on their thermodynamically stable face‐centered‐cubic (fcc) phase. Herein, a facile synthesis of Rh‐based nanocrystals featuring the metastable hexagonal close‐packed (hcp) phase is reported by using Ru seeds in their native hcp phase to template the deposition of Rh atoms. The success of such phase‐controlled synthesis relies on the templating effect promoted by the small lattice mismatch between Ru and Rh and the slow dropwise titration of the precursor at an elevated temperature, ensuring the layer‐by‐layer growth mode and thus the formation of a conformal hcp‐Rh shell. Faster injection rate of Rh(III) precursor leads to the formation of a rough Rh shell in the conventional fcc phase due to accelerated reaction kinetics. Considering both thermodynamic and kinetic aspects of this system, the hcp‐Rh phase is favored when the low surface energy from smooth overlayers balances the high bulk energy of the metastable phase, achieved through tight control of reaction rates and deposition patterns. These Ru hcp @Rh hcp core–shell nanocrystals demonstrate thermal stability up to 400 °C, while exhibiting higher catalytic activity toward ethanol oxidation reaction compared to Ru hcp @Rh fcc counterparts.

Sponsoring Organization:
USDOE
OSTI ID:
2473170
Journal Information:
Small Methods, Journal Name: Small Methods Journal Issue: 3 Vol. 9; ISSN 2366-9608
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

References (54)

Shape‐Controlled Synthesis of Colloidal Metal Nanocrystals by Replicating the Surface Atomic Structure on the Seed journal April 2018
Facile Synthesis of Palladium‐Based Nanocrystals with Different Crystal Phases and a Comparison of Their Catalytic Properties journal October 2021
Homogeneous Metastable Hexagonal Phase Iridium Enhances Hydrogen Evolution Catalysis journal February 2023
Electrochemical Synthesis of Tetrahexahedral Rhodium Nanocrystals with Extraordinarily High Surface Energy and High Electrocatalytic Activity journal April 2014
Seed-Mediated Growth of Colloidal Metal Nanocrystals journal December 2016
Size and Shape Control of Metal Nanoparticles for Reaction Selectivity in Catalysis journal August 2012
2D/0D hierarchical heterostructures prepared via facet‐selective epitaxial growth of triangular Rh nanoplates on 2H‐Pd nanoparticles journal August 2022
Shape-controlled syntheses of rhodium nanocrystals for the enhancement of their catalytic properties journal January 2015
Crystal phase engineering of electrocatalysts for energy conversions journal July 2022
Electrocatalytic activity of ordered intermetallic PtSb for methanol electro-oxidation journal January 2006
Interstitial carbon atoms enhance both selectivity and activity of rhodium catalysts toward C-C cleavage in direct ethanol fuel cells journal August 2023
Recent Progress on Monoelemental Nanomaterials with Unconventional Crystal Phases journal March 2023
Template Synthesis of Noble Metal Nanocrystals with Unusual Crystal Structures and Their Catalytic Applications journal November 2016
Solvent-Mediated Shape Tuning of Well-Defined Rhodium Nanocrystals for Efficient Electrochemical Water Splitting journal May 2017
Facile Synthesis of Ru-Based Octahedral Nanocages with Ultrathin Walls in a Face-Centered Cubic Structure journal October 2017
Crystal-Phase Engineering in Heterogeneous Catalysis journal December 2023
Bimetallic Nanocrystals: Syntheses, Properties, and Applications journal July 2016
Surface and Interface Control in Nanoparticle Catalysis journal October 2019
Compensation between Surface Energy and hcp/fcc Phase Energy of Late Transition Metals from First-Principles Calculations journal April 2020
Phase-Controlled Deposition of Ru on Pd Nanocrystal Templates: Effects of Particle Shape and Size journal January 2023
Phase-Controlled Synthesis of Ru Nanocrystals via Template-Directed Growth: Surface Energy versus Bulk Energy journal April 2022
Ru Nanoframes with an fcc Structure and Enhanced Catalytic Properties journal March 2016
Synthesis and Characterization of Ru Cubic Nanocages with a Face-Centered Cubic Structure by Templating with Pd Nanocubes journal August 2016
Potential-Dependent Selectivity of Ethanol Complete Oxidation on Rh Electrode in Alkaline Media: A Synergistic Study of Electrochemical ATR-SEIRAS and IRAS journal March 2019
Symmetrical Exsolution of Rh Nanoparticles in Solid Oxide Cells for Efficient Syngas Production from Greenhouse Gases journal December 2019
Ruthenium Nanoframes in the Face-Centered Cubic Phase: Facile Synthesis and Their Enhanced Catalytic Performance journal May 2019
Tutorial on Powder X-ray Diffraction for Characterizing Nanoscale Materials journal July 2019
Discovery of Face-Centered-Cubic Ruthenium Nanoparticles: Facile Size-Controlled Synthesis Using the Chemical Reduction Method journal April 2013
Comprehensive Mechanism and Structure-Sensitivity of Ethanol Oxidation on Platinum: New Transition-State Searching Method for Resolving the Complex Reaction Network journal August 2008
Anisotropic Growth of One-Dimensional Silver Rod−Needle and Plate−Belt Heteronanostructures Induced by Twins and hcp Phase journal July 2009
Selective Epitaxial Growth of Rh Nanorods on 2H/fcc Heterophase Au Nanosheets to Form 1D/2D Rh–Au Heterostructures for Highly Efficient Hydrogen Evolution journal March 2021
Kinetically Controlled Synthesis of Rhodium Nanocrystals with Different Shapes and a Comparison Study of Their Thermal and Catalytic Properties journal April 2021
Elucidating the Role of Reduction Kinetics in the Phase-Controlled Growth on Preformed Nanocrystal Seeds: A Case Study of Ru journal March 2024
Formation of Hexagonal-Close Packed (HCP) Rhodium as a Size Effect journal January 2017
Dynamic Behavior of Rh Species in Rh/Al 2 O 3 Model Catalyst during Three-Way Catalytic Reaction: An Operando X-ray Absorption Spectroscopy Study journal December 2017
Cyclic Penta-Twinned Rhodium Nanobranches as Superior Catalysts for Ethanol Electro-oxidation journal August 2018
Ru Octahedral Nanocrystals with a Face-Centered Cubic Structure, {111} Facets, Thermal Stability up to 400 °C, and Enhanced Catalytic Activity journal April 2019
Controlling the Morphology of Rhodium Nanocrystals by Manipulating the Growth Kinetics with a Syringe Pump journal February 2011
Synthesis of hexagonal close-packed gold nanostructures journal April 2011
Ultrathin rhodium nanosheets journal January 2014
Surface modification-induced phase transformation of hexagonal close-packed gold square sheets journal March 2015
Stabilization of 4H hexagonal phase in gold nanoribbons journal July 2015
Crystal phase-based epitaxial growth of hybrid noble metal nanostructures on 4H/fcc Au nanowires journal March 2018
Phase engineering of nanomaterials journal April 2020
Crystal-phase and surface-structure engineering of ruthenium nanocrystals journal March 2020
Novel electrochemical fingerprinting methods for the precise determination of Pt shell coverage on Ru core nanoparticles journal January 2014
Preparation of Rh/C and its high electro-catalytic activity for ethanol oxidation in alkaline media journal January 2015
Ru nanodendrites composed of ultrathin fcc/hcp nanoblades for the hydrogen evolution reaction in alkaline solutions journal January 2018
Phase-controlled synthesis of Ni nanocrystals with high catalytic activity in 4-nitrophenol reduction journal January 2020
On the role of surface diffusion in determining the shape or morphology of noble-metal nanocrystals journal April 2013
Achieving complete electrooxidation of ethanol by single atomic Rh decoration of Pt nanocubes journal March 2022
The nature of the structural phase transition from the hexagonal (4H) phase to the cubic (3C) phase of silver journal March 2014
The possibility of ferromagnetic BCC ruthenium journal February 1995
About the Use of Rhodium Nanoparticles in Hydrogenation and Hydroformylation Reactions journal February 2013