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31.
32.
Tomoki Yabutani Geoffrey I. N. Waterhouse Dongxiao Sun-Waterhouse James B. Metson Akiko Iinuma Le Thi Xuan Thuy Yohei Yamada Toshio Takayanagi Junko Motonaka 《Mikrochimica acta》2014,181(15-16):1871-1878
This study describes the facile synthesis of platinum nanoparticle-containing porous carbons (Pt/C) by carbonization of freeze-dried agarose gels containing potassium tetrachloroplatinate under a nitrogen atmosphere at 800 °C. By adjusting the ratio between agarose and platinate in the freeze-dried gels, the Pt content in the final Pt/C products could be systematically varied from 0–10 wt.%. Transmission electron microscopy, inductively coupled plasma atomic emission spectrometry, X-ray photoelectron spectroscopy, Raman spectroscopy, and nitrogen physisorption measurements revealed that the Pt/C materials obtained by this method possess high surface areas (350–500 m2 g?1), narrow Pt nanoparticle size distributions (6 ± 3 nm) and nanocrystalline graphite –like carbon character. By immobilization of glucose oxidase on the surface of a 4 wt.% Pt/C electrocatalyst prepared by this route, a very sensitive amperometric glucose biosensor was obtained (response time <2 min, sensitivity 1.9 mA M?1; and a linear response with glucose concentration up to 10 mM). The simplicity and versatility of the described synthetic method suggests its application to the preparation of carbon supported noble metal catalysts including palladium/C and gold/C. Figure
This study describes the facile synthesis of platinum nanoparticle-containing porous carbons (Pt/C) by carbonization of freeze-dried agarose gels containing potassium tetrachloroplatinate. The Pt/C materials exhibited excellent electrocatalytic activities, as demonstrated by their successful integration into amperometric glucose biosensor 相似文献
33.
Yulin Wang Run Shi Lu Shang Geoffrey I. N. Waterhouse Jiaqi Zhao Qinghua Zhang Lin Gu Tierui Zhang 《Angewandte Chemie (International ed. in English)》2020,59(31):13057-13062
Carbon‐supported NiII single‐atom catalysts with a tetradentate Ni‐N2O2 coordination formed by a Schiff base ligand‐mediated pyrolysis strategy are presented. A NiII complex of the Schiff base ligand (R,R)‐(?)‐N,N′‐bis(3,5‐di‐tert‐butylsalicylidene)‐1,2‐cyclohexanediamine was adsorbed onto a carbon black support, followed by pyrolysis of the modified carbon material at 300 °C in Ar. The Ni‐N2O2/C catalyst showed excellent performance for the electrocatalytic reduction of O2 to H2O2 through a two‐electron transfer process in alkaline conditions, with a H2O2 selectivity of 96 %. At a current density of 70 mA cm?2, a H2O2 production rate of 5.9 mol gcat.?1 h?1 was achieved using a three‐phase flow cell, with good catalyst stability maintained over 8 h of testing. The Ni‐N2O2/C catalyst could electrocatalytically reduce O2 in air to H2O2 at a high current density, still affording a high H2O2 selectivity (>90 %). A precise Ni‐N2O2 coordination was key to the performance. 相似文献
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36.
Thiolate‐Mediated Photoinduced Synthesis of Ultrafine Ag2S Quantum Dots from Silver Nanoparticles 下载免费PDF全文
Yitao Cao Dr. Wei Geng Run Shi Dr. Lu Shang Prof. Geoffrey I. N. Waterhouse Prof. Limin Liu Prof. Li‐Zhu Wu Prof. Chen‐Ho Tung Prof. Yadong Yin Prof. Tierui Zhang 《Angewandte Chemie (International ed. in English)》2016,55(48):14952-14957
Photoinduced syntheses offer significant advantages over conventional thermal strategies, including improved control over reaction kinetics and low synthesis temperatures, affording nanoparticles with nontrivial and thermodynamically unstable structures. However, the photoinduced syntheses of non‐metallic nanocrystalline products (such as metal sulfides) have not yet been reported. Herein, we demonstrate the first photoinduced synthesis of ultrafine (sub‐2 nm) Ag2S quantum dots (QDs) from Ag nanoparticles at 10 °C. By thorough investigation of the mechanism for the transformation, a fundamental link was established between the intrinsic structures of the molecular intermediates and the final Ag2S products. Our results confirm the viability of low‐temperature photochemical approaches in metal sulfide synthesis, and demonstrate a new rule which could be followed in it. 相似文献
37.
The construction of good extensible rank-1 lattices 总被引:1,自引:0,他引:1
Josef Dick Friedrich Pillichshammer Benjamin J. Waterhouse. 《Mathematics of Computation》2008,77(264):2345-2373
It has been shown by Hickernell and Niederreiter that there exist generating vectors for integration lattices which yield small integration errors for for all integers . This paper provides algorithms for the construction of generating vectors which are finitely extensible for for all integers . The proofs which show that our algorithms yield good extensible rank-1 lattices are based on a sieve principle. Particularly fast algorithms are obtained by using the fast component-by-component construction of Nuyens and Cools. Analogous results are presented for generating vectors with small weighted star discrepancy.
38.
Yulin Wang Dr. Run Shi Dr. Lu Shang Prof. Geoffrey I. N. Waterhouse Jiaqi Zhao Prof. Qinghua Zhang Prof. Lin Gu Prof. Tierui Zhang 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(31):13157-13162
Carbon-supported NiII single-atom catalysts with a tetradentate Ni-N2O2 coordination formed by a Schiff base ligand-mediated pyrolysis strategy are presented. A NiII complex of the Schiff base ligand (R,R)-(−)-N,N′-bis(3,5-di-tert-butylsalicylidene)-1,2-cyclohexanediamine was adsorbed onto a carbon black support, followed by pyrolysis of the modified carbon material at 300 °C in Ar. The Ni-N2O2/C catalyst showed excellent performance for the electrocatalytic reduction of O2 to H2O2 through a two-electron transfer process in alkaline conditions, with a H2O2 selectivity of 96 %. At a current density of 70 mA cm−2, a H2O2 production rate of 5.9 mol gcat.−1 h−1 was achieved using a three-phase flow cell, with good catalyst stability maintained over 8 h of testing. The Ni-N2O2/C catalyst could electrocatalytically reduce O2 in air to H2O2 at a high current density, still affording a high H2O2 selectivity (>90 %). A precise Ni-N2O2 coordination was key to the performance. 相似文献
39.
Alexander W. Chassy Douglas O. Adams V. Felipe Laurie Andrew L. Waterhouse 《Analytica chimica acta》2012
Phenolic compounds in Vitis vinifera contribute important flavor, functionality, and health qualities to both table and wine grapes. The plant phenolic metabolic pathway has been well characterized, however many important questions remain regarding the influence of environmental conditions on pathway regulation. As a diagnostic for this pathway's regulation, we present a technique to incorporate a stable-isotopic tracer, l-phenyl-13C6-alanine (Phe13), into grape berries in situ and the accompanying high throughput analytical method based on LC–DAD–MS/MS to quantify and track the label into phenylalanine metabolites. Clusters of V. vinifera cv. Cabernet Sauvignon, either near the onset of ripening or 4 weeks later, were exposed to Phe13 in the vineyard. Phe13 was present in berries 9 days afterwards as well as labeled flavonols and anthocyanins, all of which possessed a molecular ion shift of 6 amu. However, nearly all the label was found in anthocyanins, indicating tight regulation of phenolic biosynthesis at this stage of maturity. This method provides a framework for examining the regulation of phenolic metabolism at different stages of maturity or under different environmental conditions. Additionally, this technique could serve as a tool to further probe the metabolism/catabolism of grape phenolics. 相似文献
40.
William C. Waterhouse 《Linear and Multilinear Algebra》2013,61(1-4):141-145
Take a similarity class of n × n matrices over a field K Let pi ,(λ) m(i) be the elementary divisors Li , = K [λ]/(pi ). Under conjugation by SL(n, K), the class splits into subclasses corresponding to the elements of K×/Π(NL i ×) m(i). 相似文献