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Gaudin LF, Funston AM, Bentley CL. Drop-cast gold nanoparticles are not always electrocatalytically active for the borohydride oxidation reaction. Chem Sci 2024; 15:7243-7258. [PMID: 38756820 PMCID: PMC11095372 DOI: 10.1039/d4sc00676c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Accepted: 04/11/2024] [Indexed: 05/18/2024] Open
Abstract
The next-generation of energy devices rely on advanced catalytic materials, especially electrocatalytic nanoparticles (NPs), to achieve the performance and cost required to reshape the energy landscape towards a more sustainable and cleaner future. It has become imperative to maximize the performance of the catalyst, both through improvement of the intrinsic activity of the NP, and by ensuring all particles are performing at the level of their capability. This requires not just a structure-function understanding of the catalytic material, but also an understanding of how the catalyst performance is impacted by its environment (substrate, ligand, etc.). The intrinsic activity and environment of catalytic particles on a support may differ wildly by particle, thus it is essential to build this understanding from a single-entity perspective. To achieve this herein, scanning electrochemical cell microscopy (SECCM) has been used, which is a droplet-based scanning probe technique which can encapsulate single NPs, and apply a voltage to the nanoparticle whilst measuring its resulting current. Using SECCM, single AuNPs have been encapsulated, and their activity for the borohydride oxidation reaction (BOR) is measured. A total of 268 BOR-active locations were probed (178 single particles) and a series of statistical analyses were performed in order to make the following discoveries: (1) a certain percentage of AuNPs display no BOR activity in the SECCM experiment (67.4% of single NPs), (2) visibly-similar particles display wildly varied BOR activities which cannot be explained by particle size, (3) the impact of cluster size (#NP at a single location) on a selection of diagnostic electrochemical parameters can be easily probed with SECCM, (4) exploratory statistical correlation between these parameters can be meaningfully performed with SECCM, and (5) outlying "abnormal" NP responses can be probed on a particle-by-particle basis. Each one of these findings is its own worthwhile study, yet this has been achieved with a single SECCM scan. It is hoped that this research will spur electrochemists and materials scientists to delve deeper into their substantial datasets in order to enhance the structure-function understanding, to bring about the next generation of high-performance electrocatalysts.
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Affiliation(s)
- Lachlan F Gaudin
- School of Chemistry, Monash University Clayton 3800 VIC Australia
| | - Alison M Funston
- School of Chemistry, Monash University Clayton 3800 VIC Australia
- ARC Centre of Excellence in Exciton Science, Monash University Clayton 3800 VIC Australia
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Vu MT, Ngan Nguyen TT, Hung TQ, Pham-Truong TN, Osial M, Decorse P, Nguyen TT, Piro B, Thu VT. Insights into Structural Behaviors of Thiolated and Aminated Reduced Graphene Oxide Supports to Understand Their Effect on MOR Efficiency. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:13897-13907. [PMID: 37738086 DOI: 10.1021/acs.langmuir.3c01446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/23/2023]
Abstract
It is essential to develop novel catalysts with high catalytic activity, strong durability, and good stability for further application in methanol fuel cells. In this work, we present for the first time the effect of the chemical functional groups (thiol and amine) with different electron affinity in reduced graphene oxide supports on the morphology and catalytic activity of platinum nanoparticles for the methanol oxidation reaction. Hydroxyl groups on graphene oxide were initially brominated and then transformed to the desired functional groups. The good dispersion of metal nanoparticles over functionalized carbon substrates (particle size less than 5 nm) with good durability, even at a limited functionalization degree (less than 7%) has been demonstrated by morphological and structural studies. The durability of the catalysts was much improved via strong coordination between the metal and nitrogen or sulfur atoms. Impressively, the catalytic activity of platinum nanoparticles on aminated reduced graphene oxide was found to be much better than that on thiolated graphene oxide despite the weaker affinity between amine and noble metals. These findings support further developing new graphene derivatives with the desired functionalization for electronics and energy applications..
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Affiliation(s)
- Minh Thu Vu
- Vietnam Academy of Science and Technology (VAST), University of Science and Technology of Hanoi (USTH), 18 Hoang Quoc Viet, Cau Giay, Hanoi 10000, Vietnam
| | - Thi Thanh Ngan Nguyen
- Vietnam Academy of Science and Technology (VAST), University of Science and Technology of Hanoi (USTH), 18 Hoang Quoc Viet, Cau Giay, Hanoi 10000, Vietnam
| | - Tran Quang Hung
- Vietnam Academy of Science and Technology (VAST), Institute of Chemistry (IOC), 18 Hoang Quoc Viet, Cau Giay, Hanoi 10000, Vietnam
| | | | - Magdalena Osial
- Polish Academy of Sciences, Institute of Fundamental Technological Research, Pawińskiego 5B, Warsaw 02-106, Poland
| | - Philippe Decorse
- Université Paris Cité, ITODYS, CNRS, UMR 7086, 15 rue J.-A. de Baïf, Paris F-75013, France
| | - Thi Thom Nguyen
- Vietnam Academy of Science and Technology (VAST), Institute of Tropical Technology (ITT), 18 Hoang Quoc Viet, Cau Giay, Hanoi 10000, Vietnam
| | - Benoit Piro
- Université Paris Cité, ITODYS, CNRS, UMR 7086, 15 rue J.-A. de Baïf, Paris F-75013, France
| | - Vu Thi Thu
- Vietnam Academy of Science and Technology (VAST), University of Science and Technology of Hanoi (USTH), 18 Hoang Quoc Viet, Cau Giay, Hanoi 10000, Vietnam
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Linh ND, Huyen NTT, Dang NH, Piro B, Thi Thu V. Electrochemical interface based on polydopamine and gold nanoparticles/reduced graphene oxide for impedimetric detection of lung cancer cells †. RSC Adv 2023; 13:10082-10089. [PMID: 37006357 PMCID: PMC10052696 DOI: 10.1039/d3ra00793f] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 03/21/2023] [Indexed: 03/31/2023] Open
Abstract
The use of non-invasive approaches for monitoring therapy processes in cancer patients at late stages is truly needed. In this work, we aim to develop an electrochemical interface based on polydopamine combined with gold nanoparticles and reduced graphene oxide for impedimetric detection of lung cancer cells. Gold nanoparticles (around 75 nm) were dispersed onto reduced graphene oxide material pre-electrodeposited onto disposable fluorine doped tin oxide electrodes. The coordination between gold and carbonaceous material has somehow improved the mechanical stability of this electrochemical interface. Polydopamine was later introduced onto modified electrodes via self-polymerization of dopamine in an alkaline solution. The result has demonstrated the good adhesion and biocompatibility of polydopamine towards A-549 lung cancer cells. The presence of the two conductive materials (gold nanoparticles and reduced graphene oxide) has led to a six-times decrease in charge transfer resistance of polydopamine film. Finally, the as-prepared electrochemical interface was employed for impedimetric detection of A-549 cells. The detection limit was estimated to be only 2 cells per mL. These findings have proved the possibilities to use advanced electrochemical interfaces for point-of-care applications. Non-invasive approaches for monitoring therapy processes in cancer patients at late stages is truly needed.![]()
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Affiliation(s)
- Nguyen Dieu Linh
- University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST)18 Hoang Quoc Viet, Cau GiayHanoiVietnam
| | - Nguyen Thi Trang Huyen
- University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST)18 Hoang Quoc Viet, Cau GiayHanoiVietnam
| | - Nguyen Hai Dang
- University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST)18 Hoang Quoc Viet, Cau GiayHanoiVietnam
| | - Benoit Piro
- Université Paris Cité, ITODYS, CNRSUMR 7086, 15 Rue J.-A. de BaïfParisF-75013 France
| | - Vu Thi Thu
- University of Science and Technology of Hanoi (USTH), Vietnam Academy of Science and Technology (VAST)18 Hoang Quoc Viet, Cau GiayHanoiVietnam
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Singh R, Singh M. Highly selective and specific monitoring of pollutants using dual template imprinted MIP sensor. J Electroanal Chem (Lausanne) 2022. [DOI: 10.1016/j.jelechem.2022.116939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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