University of Saskatchewan

About: University of Saskatchewan is a education organization based out in Saskatoon, Saskatchewan, Canada. It is known for research contribution in the topics: Population & Health care. The organization has 25021 authors who have published 52579 publications receiving 1483049 citations. The organization is also known as: USask.

Single Atom Ruthenium-Doped CoP/CDs Nanosheets via Splicing of Carbon-Dots for Robust Hydrogen Production

Abstract: Ultrathin two-dimensional catalysts are attracting attention in the field of electrocatalytic hydrogen evolution. This work describe a composite material design in which CoP nanoparticles doped with Ru single-atom sites supported on carbon dots (CDs) single-layer nanosheets formed by splicing CDs (Ru CoP/CDs). Small CD fragments bore abundant functional groups, analogous to pieces of a jigsaw puzzle, and could provide a high density of binding sites to immobilize Ru CoP. The single-particle-thick nanosheets formed by splicing CDs acted as supports, which improved the conductivity of the electrocatalyst and the stability of the catalyst during operation. The Ru CoP/CDs formed from doping atomic Ru dispersed on CoP showed very high efficiency for the hydrogen evolution reaction (HER) over a wide pH range. The catalyst prepared under optimized conditions displayed outstanding stability and activity: the overpotential for the HER at a current density of 10 mA cm was as low as 51 and 49 mV under alkaline and acidic conditions, respectively. Density functional theory calculations showed that the substituted Ru single atoms lowered the proton-coupled electron transfer energy barrier and promoted H−H bond formation, thereby enhancing catalytic performance for the HER. The findings open a new avenue for developing carbon-based hybridization materials with integrated electrocatalytic performance for water splitting. 1 1 1 −2

Reconsidering Policy Feedback How Policies Affect Politics

Abstract: Drawing on examples from the history and politics of Social Security in the United States, this article assesses early and more recent contributions to the policy feedback literature to clarify the meaning of this concept before sketching a new research agenda on policy feedback. As argued, three new streams of policy feedback scholarship have emerged since the late 1990s. Because these new research streams have seldom been discussed together, this article makes a direct contribution to the ongoing social science debate about the nature and the role of policy feedback in advanced industrial societies.

Magnetic penetration depth in single-crystal YBa2Cu3O7- delta.

Abstract: We report the first measurement of the magnetic penetration depth lambda(T,theta) in single crystals of YBa/sub 2/Cu/sub 3/O/sub 7-//sub delta/ (delta/similar to/0.1). Results are consistent with conventional s-wave pairing, and yield penetration depths of lambda/sub a//sub b/(0) = 1415 +- 30 A and lambda/sub c/(0)>7000 A, parallel and perpendicular to the basal plane, respectively. Comparative data on sintered YBa/sub 2/Cu/sub 3/O/sub 7/ also shown to be consistent with the single-crystal results. The ..mu../sup +/ spin rotation data, together with specific-heat results, indicate a two-dimensional carrier density of eta/sub 2//sub d/approx. =8 x 10/sup 14/ carriers cm/sup -2/ and a basal-plane effective mass of m/sub a//sub b//sup *//m/sub e/approx. =10. .AE