Topic
Noble metal
About: Noble metal is a research topic. Over the lifetime, 15113 publications have been published within this topic receiving 337947 citations.
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TL;DR: It is demonstrated that a C-doped TiO2/C (C-TixOy/C) material derived from MIL-125(Ti) metal-organic framework can achieve a high Faradaic efficiency of 17.8%, which even surpass most of the established noble metal-based catalysts.
Abstract: The electrochemical conversion of N2 at ambient conditions using renewably generated electricity is an attractive approach for sustainable ammonia (NH3 ) production. Considering the chemical inertness of N2 , rational design of efficient and stable catalysts is required. Therefore, in this work, it is demonstrated that a C-doped TiO2 /C (C-Tix Oy /C) material derived from the metal-organic framework (MOF) MIL-125(Ti) can achieve a high Faradaic efficiency (FE) of 17.8 %, which even surpasses most of the established noble metal-based catalysts. On the basis of the experimental results and theoretical calculations, the remarkable properties of the catalysts can be attributed to the doping of carbon atoms into oxygen vacancies (OVs) and the formation of Ti-C bonds in C-Tix Oy . This binding motive is found to be energetically more favorable for N2 activation compared to the non-substituted OVs in TiO2 . This work elucidates that electrochemical N2 reduction reaction (NRR) performance can be largely improved by creating catalytically active centers through rational substitution of anions into metal oxides.
141 citations
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TL;DR: In this article, the synthesis, characterization, and catalytic performance of Pt supported on PTA encapsulated in a metal organic framework (MOF) are reported, where the highly dispersed Keggin units of PTA in NH 2 -MIL-101(Al), synthesized in one step, act as anchoring sites for the Pt precursor species.
141 citations
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TL;DR: Ruthenium catalysts (1-5 wt%) were prepared by exchange or impregnation of different supports: CeO 2, TiO 2, or ZrO 2 as discussed by the authors.
141 citations
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TL;DR: Combining tetra-n-butylammonium decatungstate (TBADT) and cobaloxime pyridine chloride (COPC) can catalytically dehydrogenate unactivated alkanes and alcohols under near-UV irradiation at room temperature with hydrogen as the sole by-product.
Abstract: The dehydrogenation of unactivated alkanes is an important transformation both in industrial and biological systems. Recent efforts towards this reaction have revolved around high temperature, organometallic C-H activation by noble metal catalysts that produce alkenes and hydrogen gas as the sole products. Conversely, natural desaturase systems proceed through stepwise hydrogen atom transfer at physiological temperature; however, these transformations require a terminal oxidant. Here we show combining tetra-n-butylammonium decatungstate (TBADT) and cobaloxime pyridine chloride (COPC) can catalytically dehydrogenate unactivated alkanes and alcohols under near-UV irradiation at room temperature with hydrogen as the sole by-product. This noble metal-free process follows a nature-inspired pathway of high- and low-energy hydrogen atom abstractions. The hydrogen evolution ability of cobaloximes is leveraged to render the system catalytic, with cooperative turnover numbers up to 48 and yields up to 83%. Our results demonstrate how cooperative base metal catalysis can achieve transformations previously restricted to precious metal catalysts.
141 citations
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TL;DR: In this article, an interfacial-bond-induced intermediate modulation was proposed to accelerate the hydrogen evolution reaction (HER) and oxygen evolution reaction by hybridizing a 2D nickel metal-organic framework (MOF) and Pt nanocrystals into a heterostructure.
141 citations