Nickel

About: Nickel is a research topic. Over the lifetime, 79308 publications have been published within this topic receiving 1210058 citations. The topic is also known as: Ni & element 28.

The non-enzymatic determination of glucose using an electrolytically fabricated nickel microparticle modified boron-doped diamond electrode or nickel foil electrode

Abstract: A nickel modified boron-doped diamond (Ni-BDD) electrode or nickel foil electrode were used in the non-enzymatic determination of glucose in alkaline solutions. The Ni-BDD electrode was electrodeposited from a 1 mM Ni(NO3)2 solution (pH 5), followed by repeat cycling in KOH. Subsequent analysis utilised the Ni(OH)2/NiOOH redox couple to electrocatalyse the oxidation of glucose. Glucose was determined to limits of 2.7 μM with a sensitivity of 1.04 μA μM−1 cm−2 at the Ni-BDD electrode. The foil electrode was comparably sensitive achieving a limit of 1.8 μM but a relatively lower sensitivity of 0.67 μA μM−1 cm−2. SEM analysis of the electrodes found the Ni-BDD to be modified by a quasi-random microparticle assembly, with approximately 7.6 μg cm−2 of nickel present on the surface.

Direct growth of ternary Ni–Fe–P porous nanorods onto nickel foam as a highly active, robust bi-functional electrocatalyst for overall water splitting

Abstract: To date, metal organic frameworks (MOFs) have emerged as a new platform to endow electrocatalysts with multi-scale architectures. Herein, we report a universal MOF-based post-treatment strategy to produce carbon-incorporated ternary Ni–Fe–P porous nanorods grown onto nickel foam directly as a non-precious-metal bifunctional electrocatalyst.

Nickel metal–organic framework implanted on graphene and incubated to be ultrasmall nickel phosphide nanocrystals acts as a highly efficient water splitting electrocatalyst

Abstract: The development of low-cost, efficient, and stable electrocatalysts with bifunctional catalytic activity for overall water splitting is desirable but remains a great challenge. Here, a template-confinement strategy is presented with nickel metal–organic framework (MOF-74-Ni) implanted on graphene oxide and incubated by low temperature phosphorization to become ultrasmall nickel phosphide nanocrystals anchored on reduced graphene oxide (termed Ni2P/rGO). The size-controlled synthesis of ultrasmall metal-based catalysts is of vital economic interest and scientific importance for chemical conversion technologies. The Ni2P/rGO guarantees large active surface area and perfect dispersity of the active sites with ultrasmall particle sizes (average about 2.6 nm), which can serve as a highly efficient electrocatalyst for overall water splitting. In 1.0 M KOH, the Ni2P/rGO exhibited remarkable electrocatalytic performance for both HER and OER, affording a current density of 10 mA cm−2 at overpotentials of 142 mV for HER and 260 mV for OER with small Tafel slope. Furthermore, an electrolyzer employed with Ni2P/rGO as a bifunctional catalyst in both the cathode and anode in 1.0 M KOH generated 10 mA cm−2 at a voltage of 1.61 V with excellent stability, comparable to the integrated Pt/C and RuO2 counterparts, which is among the best performances of transition metal phosphides (TMPs).

Electrodeposited Ni dendrites with high activity and durability for hydrogen evolution reaction in alkaline water electrolysis

Abstract: Different shapes of various nickel structures, including dendrite, particle and film are fabricated by electrodeposition under various conditions. The shape of nickel structures is definitely dependent on the deposition potential, leading to different electrochemical surface area and edge facets. The nickel particle which has a polycrystalline center and edge is obtained at high negative potential. On the other hand, the nickel dendrite deposited by relatively low negative potential exhibits large electrochemical surface area and a particularly active facet for hydrogen evolution reaction (HER) in alkaline water electrolysis. In fact the nickel dendrite shows the highest catalytic activity and stability for HER among the various nickel structures.