scispace - formally typeset
Search or ask a question
Topic

Noble metal

About: Noble metal is a research topic. Over the lifetime, 15113 publications have been published within this topic receiving 337947 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: A modular materials design leading to noble metal-free composite electrocatalysts, which combine high electrical conductivity, high OER and HER reactivity and high durability are reported, which will enable the development of multifunctional, mixed metal oxide composites as high-performance electroCatalysts for challenging energy conversion and storage reactions.
Abstract: Electrocatalytic water splitting into H2 and O2 is a key technology for carbon-neutral energy. Here, we report a modular materials design leading to noble metal-free composite electrocatalysts, which combine high electrical conductivity, high OER and HER reactivity and high durability. The scalable bottom-up fabrication allows the stable deposition of mixed metal oxide nanostructures with different functionalities on copper foam electrodes. The composite catalyst shows sustained OER and HER activity in 0.1 m aqueous KOH over prolonged periods (t>10 h) at low overpotentials (OER: ≈300 mV; HER: ≈100 mV) and high faradaic efficiencies (OER: ≈100 %, HER: ≈98 %). The new synthetic concept will enable the development of multifunctional, mixed metal oxide composites as high-performance electrocatalysts for challenging energy conversion and storage reactions.

154 citations

Journal ArticleDOI
TL;DR: In this article, three gas sensing hybrid nanostructures based on noble metal (Au, Pd and Pt) decorated octahedral SnO2 nanocrystals were specifically constructed.
Abstract: Surface modification with noble metals is considered as an effective strategy to enhance sensitivity and selectivity of metal oxide-based gas sensors. This enhancement with noble metal decoration is generally attributed to the formation of a heterogeneous interface between the noble metal and metal oxide. However, the sensitization mechanism of noble metals on the specific facets of the metal oxide support lacks a unified understanding. In this work, three gas sensing hybrid nanostructures based on noble metal (Au, Pd and Pt) decorated {221} faceted octahedral SnO2 nanocrystals were specifically constructed. Our results showed that, on these {221} specific facets of SnO2, Au exhibited a positive effect for enhancing the sensitivity and selectivity of SnO2 sensors, while Pd and Pt played the opposite roles. It is considered that the sensitization effects of noble metals are related to their surface chemical states and interaction with the metal oxide support. The methodology demonstrated in this work is beneficial to probing into the sensitization mechanisms of noble metals in semiconductor/metal hybrid sensors.

153 citations

Journal ArticleDOI
TL;DR: In this paper, a novel in-situ route was developed to load well-dispersed palladium (Pd) nanoparticles on the surface of hydroxyl-group-rich titania precursor.
Abstract: A novel in-situ route was developed to load well-dispersed palladium (Pd) nanoparticles on the surface of hydroxyl-group-rich titania precursor. Pd nanoparticles are formed by in-situ reduction of Pd(II) by Sn(II); the latter is linked to the surface of TiO2 precursors through inorganic grafting. The initial Pd nanoparticles then serve as seed for subsequent particle growth and allow us to systematically control the amount and size of the Pd nanoparticles by varying the amount of added PdCl2. The Pd nanoparticles, with no protection from ligands, are well-dispersed on the TiO2 precursor surface without aggregation even at a high Pd loading of 22.5 wt %. The method is also extended to introduce other noble metal nanoparticles including Au, Ag, Pt, and their bimetallic nanoparticles onto the TiO2 precursor surface. The as-obtained TiO2 precursor−Pd composite is a promising catalyst in nanocatalysis. As an example, the TiO2 precursor−Pd shows high catalytic activity for Suzuki cross-coupling reaction and can...

153 citations

Journal ArticleDOI
TL;DR: In this paper, multiwalled carbon nanotube (MWCNT) films have been fabricated by using plasmaenhanced chemical vapor deposition system onto Cr-Au patterned alumina substrates, provided with 3nm thick Fe growth catalyst, for NO2 and NH3 gas sensing applications, at sensor temperature in the range of 100-250°C.
Abstract: Multiwalled carbon nanotube (MWCNT) films have been fabricated by using plasma-enhanced chemical vapor deposition system onto Cr–Au patterned alumina substrates, provided with 3nm thick Fe growth catalyst, for NO2 and NH3 gas sensing applications, at sensor temperature in the range of 100–250°C. Nanoclusters of noble metal surface catalysts (Au and Pt) have been sputtered on the surface of MWCNTs to enhance the gas sensitivity with respect to unfunctionalized carbon nanotube films. It was found that the gas sensitivity of Pt- and Au-functionalized MWCNT gas sensors significantly improved by a factor up to an order of magnitude through a spillover effect for NH3 and NO2 gas detections, respectively. The metal-functionalized MWCNT sensors exhibit very high gas sensitivity, fast response, reversibility, good repeatability, and sub-ppm range detection limit with the sensing properties of the MWCNT films tailored by surface catalyst used to functionalize the MWCNT sensors.

153 citations

Journal ArticleDOI
TL;DR: In this review, achievements on non-noble metal catalysed carbonylative transformations have been summarized and discussed.
Abstract: Transition metal catalysts are formidable tools towards greener chemistry, allowing for low-waste, energy-efficient, and selective reactions. And transition metal-catalysed carbonylation procedures are powerful methodologies for producing carbonyl-containing compounds. The existing reviews/chapters/books are mainly focused on noble metal (Ru, Rh, Ir, Pd, Pt) catalysed carbonylation reactions. In this review, achievements on non-noble metal (Mn, Fe, Cu, Co, Ni) catalysed carbonylative transformations have been summarized and discussed.

153 citations


Network Information
Related Topics (5)
Oxide
213.4K papers, 3.6M citations
92% related
Nanoparticle
85.9K papers, 2.6M citations
92% related
Graphene
144.5K papers, 4.9M citations
91% related
Adsorption
226.4K papers, 5.9M citations
91% related
Carbon nanotube
109K papers, 3.6M citations
90% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023485
2022986
2021622
2020724
2019896
2018767