Topic
Platinum
About: Platinum is a research topic. Over the lifetime, 49675 publications have been published within this topic receiving 1150035 citations. The topic is also known as: Pt & element 78.
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TL;DR: In this paper, the steady-state current response as a function of both rotation rate and [H2O2 was studied at pH 7.26 for the [H 2O2] range 0-80 mM and for rotation rates 630-10,000 rp.m.
243 citations
TL;DR: In this article, a single-atom platinum immobilized NiO/Ni heterostructure (PtSA-NiO//Ni) was developed as an alkaline hydrogen evolution catalyst.
Abstract: Single-atom catalysts provide an effective approach to reduce the amount of precious metals meanwhile maintain their catalytic activity. However, the sluggish activity of the catalysts for alkaline water dissociation has hampered advances in highly efficient hydrogen production. Herein, we develop a single-atom platinum immobilized NiO/Ni heterostructure (PtSA-NiO/Ni) as an alkaline hydrogen evolution catalyst. It is found that Pt single atom coupled with NiO/Ni heterostructure enables the tunable binding abilities of hydroxyl ions (OH*) and hydrogen (H*), which efficiently tailors the water dissociation energy and promotes the H* conversion for accelerating alkaline hydrogen evolution reaction. A further enhancement is achieved by constructing PtSA-NiO/Ni nanosheets on Ag nanowires to form a hierarchical three-dimensional morphology. Consequently, the fabricated PtSA-NiO/Ni catalyst displays high alkaline hydrogen evolution performances with a quite high mass activity of 20.6 A mg−1 for Pt at the overpotential of 100 mV, significantly outperforming the reported catalysts. While H2 evolution from water may represent a renewable energy source, there is a strong need to improve catalytic efficiencies while maximizing materials utilization. Here, authors examine single-atom Pt on nickel-based heterostructures as highly active electrocatalysts for alkaline H2 evolution.
243 citations
TL;DR: A series of four catalysts with 5, 10, 20, and 30 weight percent of Pt on carbon has been prepared and incorporated into Teflon-bonded electrodes The mean Pt crystallite sizes, as determined by chemisorption, were less than 1, 11, 14 and 41 nm as mentioned in this paper.
Abstract: A series of four catalysts with 5, 10, 20, and 30 weight percent of Pt on carbon has been prepared and incorporated into Teflon‐bonded electrodes The mean Pt crystallite sizes, as determined by chemisorption, were less than 1, 11, 14, and 41 nm Also, a Teflon‐bonded Pt‐black electrocatalyst with a Pt crystallite size of 12 nm was prepared These electrodes were used for the cathodic reduction of dioxygen in at 298 K The turnover frequency decreased by a factor of 20 with decreasing particle size Since surface area per weight of metal increases as particle size decreases, the optimum Pt crystallite diameter is about 3 nm
242 citations
TL;DR: In this paper, the ideality factors were obtained to be n∼1.10 and 1.24 eV for the Pd/GaN diode, respectively.
Abstract: Platinum (Pt) and palladium (Pd) Schottky diodes on n‐type GaN grown by metalorganic chemical vapor deposition were achieved and investigated. Aluminum was used for ohmic contacts. Barrier heights were determined to be as high as ΦB=1.13 eV by the current–voltage (I–V) method and ΦB=1.27 eV by the capacitance–voltage (C–V) method for the Pt/GaN diode, and ΦB=1.11 eV, ΦB=0.96 eV, and ΦB=1.24 eV by I–V, activation energy (I–V–T), and C–V methods for the Pd/GaN diode, respectively. The ideality factors were obtained to be n∼1.10.
242 citations
TL;DR: In this paper, the authors deduced the reaction mechanism for hydrogen molecule oxidation on platinum electrocatalysts in acid solutions by comparing kinetic rate parameters obtained electrochemically, to those obtained in the gas phase from H 2 -D 2 exchange.
242 citations