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Mkhohlakali A, Fuku X, Seo MH, Modibedi M, Khotseng L, Mathe M. Electro-Design of Bimetallic PdTe Electrocatalyst for Ethanol Oxidation: Combined Experimental Approach and Ab Initio Density Functional Theory (DFT)-Based Study. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3607. [PMID: 36296796 PMCID: PMC9610566 DOI: 10.3390/nano12203607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 10/10/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
An alternative electrosynthesis of PdTe, using the electrochemical atomic layer deposition (E-ALD) method, is reported. The cyclic voltammetry technique was used to analyze Au substrate in copper (Cu2+), and a tellurous (Te4+) solution was used to identify UPDs and set the E-ALD cycle program. Results obtained using atomic force microscopy (AFM) and scanning electron microscopy (SEM) techniques reveal the nanometer-sized flat morphology of the systems, indicating the epitaxial characteristics of Pd and PdTe nanofilms. The effect of the Pd:Te ratio on the crystalline structure, electronic properties, and magnetic properties was investigated using a combination of density functional theory (DFT) and X-ray diffraction techniques. Te-containing electrocatalysts showed improved peak current response and negative onset potential toward ethanol oxidation (5 mA; -0.49 V) than Pd (2.0 mA; -0.3 V). Moreover, DFT ab initio calculation results obtained when the effect of Te content on oxygen adsorption was studied revealed that the d-band center shifted relative to the Fermi level: -1.83 eV, -1.98 eV, and -2.14 eV for Pd, Pd3Te, and Pd3Te2, respectively. The results signify the weakening of the CO-like species and the improvement in the PdTe catalytic activity. Thus, the electronic and geometric effects are the descriptors of Pd3Te2 activity. The results suggest that Pd2Te2 is a potential candidate electrocatalyst that can be used for the fabrication of ethanol fuel cells.
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Affiliation(s)
- Andile Mkhohlakali
- Analytical Chemistry Division, Mintek, 200 Malibongwe Drive, Randburg 2194, South Africa
- Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville,
Cape Town 7535, South Africa
| | - Xolile Fuku
- Institute of Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Florida Science Campus, Roodepoort 1710, South Africa
| | - Min Ho Seo
- Department of Nanotechnology Engineering, Pukyong National University, 45 Yongso-ro, Nam-gu, Busan 48547, Korea
| | - Mmalewane Modibedi
- Council for Scientific and Industrial Research (CSIR), Energy Center, Pretoria 0012, South Africa
| | - Lindiwe Khotseng
- Department of Chemistry, University of the Western Cape, Private Bag X17, Bellville,
Cape Town 7535, South Africa
| | - Mkhulu Mathe
- Department of Chemistry, ICES, CSET, University of South Africa, Florida Science Campus, Roodepoort 1710, South Africa
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Zhu X, Hu Z, Huang M, Zhao Y, Qu J, Hu S. Au nanowires with high aspect ratio and atomic shell of Pt-Ru alloy for enhanced methanol oxidation reaction. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2020.11.071] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Mkhohlakali AC, Fuku X, Modibedi RM, Khotseng LE, Mathe MK. Electroformation of Pd‐modified Thin Film Electrocatalysts Using E‐ALD Technique. ELECTROANAL 2021. [DOI: 10.1002/elan.202100040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- A. C. Mkhohlakali
- Smart Places Energy Centre Council for Scientific and Industrial Research (CSIR) Pretoria 0012 South Africa
- Department of Chemistry University of the Western Cape, Bellville Cape Town South Africa
| | - X. Fuku
- Smart Places Energy Centre Council for Scientific and Industrial Research (CSIR) Pretoria 0012 South Africa
| | - R. M. Modibedi
- Smart Places Energy Centre Council for Scientific and Industrial Research (CSIR) Pretoria 0012 South Africa
| | - L. E. Khotseng
- Department of Chemistry University of the Western Cape, Bellville Cape Town South Africa
| | - M. K. Mathe
- Smart Places Energy Centre Council for Scientific and Industrial Research (CSIR) Pretoria 0012 South Africa
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Probing the Surface of Noble Metals Electrochemically by Underpotential Deposition of Transition Metals. SURFACES 2019. [DOI: 10.3390/surfaces2020020] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The advances in material science have led to the development of novel and various materials as nanoparticles or thin films. Underpotential deposition (upd) of transition metals appears to be a very sensitive method for probing the surfaces of noble metals, which is a parameter that has an important effect on the activity in heterogeneous catalysis. Underpotential deposition as a surface characterization tool permits researchers to precisely determine the crystallographic orientations of nanoparticles or the real surface area of various surfaces. Among all the work dealing with upd, this review focuses specifically on the main upd systems used to probe surfaces of noble metals in electrocatalysis, from poly‒ and single-crystalline surfaces to nanoparticles. Cuupd is reported as a tool to determine the active surface area of gold‒ and platinum‒based bimetallic electrode materials. Pbupd is the most used system to assess the crystallographic orientations on nanoparticles’ surface. In the case of platinum, Bi and Ge adsorptions are singled out for probing (1 1 1) and (1 0 0) facets, respectively.
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Hu J, Li H, Gan QM, Li YJ. Three-dimensional porous Au nanocoral structure decorated with Pt submonolayer via galvanic displacement of copper adatoms for electrooxidation of formic acid. RUSS J ELECTROCHEM+ 2016. [DOI: 10.1134/s1023193516040054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zhang L, Chen Q, Jiang Z, Xie Z, Zheng L. Cu2+ underpotential-deposition assisted synthesis of Au and Au–Pd alloy nanocrystals with systematic shape evolution. CrystEngComm 2015. [DOI: 10.1039/c5ce00766f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With the assistance of Cu2+ underpotential deposition on the Au surface, Au and Au–Pd nanocrystals with systematic shape evolution were successfully synthesized.
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Affiliation(s)
- Lei Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, and Collaborative Innovation Center of Chemistry for Energy Materials
- Xiamen University
- Xiamen 361005, China
| | - Qiaoli Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, and Collaborative Innovation Center of Chemistry for Energy Materials
- Xiamen University
- Xiamen 361005, China
| | - Zhiyuan Jiang
- Department of Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005, China
| | - Zhaoxiong Xie
- State Key Laboratory of Physical Chemistry of Solid Surfaces, and Collaborative Innovation Center of Chemistry for Energy Materials
- Xiamen University
- Xiamen 361005, China
| | - Lansun Zheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, and Collaborative Innovation Center of Chemistry for Energy Materials
- Xiamen University
- Xiamen 361005, China
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Prieto MJ, Tremiliosi-Filho G. Influence of Substrate Steps on the Catalytic Properties of Pt Layers: The Ethanol Electrooxidation Reaction. Chemphyschem 2014; 15:3864-70. [DOI: 10.1002/cphc.201402377] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 08/11/2014] [Indexed: 11/07/2022]
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Prieto MJ, Tremiliosi-Filho G. Surface restructuring of Pt films on Au stepped surfaces: effects on catalytic behaviour. Phys Chem Chem Phys 2013; 15:13184-9. [DOI: 10.1039/c3cp51513c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Simonov AN, Plyusnin PE, Shubin YV, Kvon RI, Korenev SV, Parmon VN. Hydrogen electrooxidation over palladium–gold alloy: Effect of pretreatment in ethylene on catalytic activity and CO tolerance. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.05.043] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Electrodeposited Pd Sub-Monolayers on Carbon-Supported Au Particles of Few Nanometers in Size: Electrocatalytic Activity for Hydrogen Oxidation and CO Tolerance Vs. Pd Coverage. Electrocatalysis (N Y) 2012. [DOI: 10.1007/s12678-012-0084-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Price SWT, Speed JD, Kannan P, Russell AE. Exploring the first steps in core-shell electrocatalyst preparation: in situ characterization of the underpotential deposition of Cu on supported Au nanoparticles. J Am Chem Soc 2011; 133:19448-58. [PMID: 22032178 PMCID: PMC3548434 DOI: 10.1021/ja206763e] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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The underpotential deposition (upd) of a Cu shell on a non-Pt nanoparticle core followed by galvanic displacement of the Cu template shell to form core–shell electrocatalyst materials is one means by which the Pt-based mass activity targets required for commercialization of PEM fuel cells may be reached. In situ EXAFS measurements were conducted at both the Au L3 and the Cu K absorption edges during deposition of Cu onto a carbon-supported Au electrocatalyst to study the initial stages of formation of such a core–shell electrocatalyst. The Au L3 EXAFS data obtained in 0.5 mol dm–3 H2SO4 show that the shape of the Au core is potential dependent, from a flattened to a round spherical shape as the Cu upd potential is approached. Following the addition of 2 mmol dm–3 Cu, the structure was also measured as a function of the applied potential. At +0.2 V vs Hg/Hg2SO4, the Cu2+ species was found to be a hydrated octahedron. As the potential was made more negative, single-crystal studies predict an ordered bilayer of sulfate anions and partially discharged Cu ions, followed by a complete/uniform layer of Cu atoms. In contrast, the model obtained by fitting the Au L3 and Cu K EXAFS data corresponds first to partially discharged Cu ions deposited at the defect sites in the outer shell of the Au nanoparticles at −0.42 V, followed by the growth of clusters of Cu atoms at −0.51 V. The absence of a uniform/complete Cu shell, even at the most negative potentials investigated, has implications for the structure, and the activity and/or stability, of the core–shell catalyst that would be subsequently formed following galvanic displacement of the Cu shell.
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Affiliation(s)
- Stephen W T Price
- School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom
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Beni V, Gelaw TK, O'Sullivan CK. Study of the combination of the deposition/stripping of sacrificial metal nano-structures and alkanethiol as a route for genosensor surface preparation. Electrochem commun 2011. [DOI: 10.1016/j.elecom.2011.01.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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Ruvinsky PS, Pronkin SN, Zaikovskii VI, Bernhardt P, Savinova ER. On the enhanced electrocatalytic activity of Pd overlayers on carbon-supported gold particles in hydrogen electrooxidation. Phys Chem Chem Phys 2008; 10:6665-76. [DOI: 10.1039/b803703e] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hernandez F, Baltruschat H. Hydrogen evolution and Cu UPD at stepped gold single crystals modified with Pd. J Solid State Electrochem 2007. [DOI: 10.1007/s10008-007-0308-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kuzume A, Herrero E, Feliu JM, Ahlberg E, Nichols RJ, Schiffrin DJ. Electrochemical reactivity in nanoscale domains: O2 reduction on a fullerene modified gold surface. Phys Chem Chem Phys 2005; 7:1293-9. [DOI: 10.1039/b417928p] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Oxygen reduction at electrochemically deposited crystallographically oriented Au(100)-like gold nanoparticles. Electrochem commun 2005. [DOI: 10.1016/j.elecom.2004.10.010] [Citation(s) in RCA: 130] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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