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Noble-metal-free electrocatalysts are highly desired for hydrogen evolution reaction (HER). As a promising candidate, transition-metal phosphides however suffer from inevitable surface oxidation that will obstruct active-site exposure. Herein, a facile reduction followed by a surface phosphorization is introduced to convert surface-oxidized cobalt phosphides to Co2(P2O7)-CoP heterostructures within N-doped carbon matrix (Co2(P2O7)-CoP/NC), which accomplish high HER performance in both acidic and alkaline electrolytes. They affords low overpotentials (η10) of only 88 and 97 mV at a current density of -10 mA cm-2, and small Tafel slopes of 51 and 61 mV dec-1 in 0.5 M H2SO4 and 1.0 M KOH, respectively. They outperforms the parent surface-oxidized Co2P and most of previously reported Pt-free electrocatalysts. The remarkably improved electrocatalysis should be ascribed to the strong surface acidity of Co2(P2O7) component and thereby the promoted HER kinetics on Co2(P2O7)-CoP interfaces. This work is anticipated to encourage the development of cost-efficient electrocatalysts via surface engineering.
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The development of low-cost and highly efficient electrocatalysts via an eco-friendly synthetic method is of great significance for future renewable energy storage and conversion systems. Herein, coba...
As one class of important functional materials, transition metal phosphides (TMPs) nanostructures show promising applications in catalysis and energy storage fields. Although great progress has been a...
Exploring low-cost and outstanding bimetallic phosphides to substitute noble metals as electrocatalysts for oxygen evolution reaction (OER) in alkaline media is essential for renewable energy technolo...
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Coronary artery disease (CAD) is increasing rapidly in Egyptian people and manifesting a younger age. Higher plasma low-density lipoprotein cholesterol (LDL-C), is a major predictor for th...
Randomized study. Patients with coronary artery disease equivalent will be randomized to receive atorvastatin 40 mg/day + placebo vs. atorvastatin 40 mg/day + ezetimibe 40 mg/day. Oxidized...
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Stable cobalt atoms that have the same atomic number as the element cobalt, but differ in atomic weight. Co-59 is a stable cobalt isotope.
Unstable isotopes of cobalt that decay or disintegrate emitting radiation. Co atoms with atomic weights of 54-64, except 59, are radioactive cobalt isotopes.
A group of cell-surface receptors for oxidatively modified LOW-DENSITY LIPOPROTEINS. The group includes certain SCAVENGER RECEPTORS that contribute to the pathogenesis of ATHEROSCLEROSIS by uptake of oxidized LDL.
Specific alloys not less than 85% chromium and nickel or cobalt, with traces of either nickel or cobalt, molybdenum, and other substances. They are used in partial dentures, orthopedic implants, etc.
A BLOOD PRESSURE regulating system of interacting components that include RENIN; ANGIOTENSINOGEN; ANGIOTENSIN CONVERTING ENZYME; ANGIOTENSIN I; ANGIOTENSIN II; and angiotensinase. Renin, an enzyme produced in the kidney, acts on angiotensinogen, an alpha-2 globulin produced by the liver, forming ANGIOTENSIN I. Angiotensin-converting enzyme, contained in the lung, acts on angiotensin I in the plasma converting it to ANGIOTENSIN II, an extremely powerful vasoconstrictor. Angiotensin II causes contraction of the arteriolar and renal VASCULAR SMOOTH MUSCLE, leading to retention of salt and water in the KIDNEY and increased arterial blood pressure. In addition, angiotensin II stimulates the release of ALDOSTERONE from the ADRENAL CORTEX, which in turn also increases salt and water retention in the kidney. Angiotensin-converting enzyme also breaks down BRADYKININ, a powerful vasodilator and component of the KALLIKREIN-KININ SYSTEM.