Highly Active 3D-Nanoarray-Supported Oxygen-Evolving Electrode Generated From Cobalt-Phytate Nanoplates

Abstract

We develop a 3D nanowires-array-support/active cobalt plating to grow cobalt-phytate nanoplates (3D-NA/Co/CoNPAs) as an advanced oxygen-evolving electrode. The constructed structure exhibits greatly enhanced catalytic activity (ηj=10 mA cm–2 = 265 mV) and good stability (current retention >94% after electrolysis of 6 h). Moreover, the Co-phytate grown on 3D-NA/Co is also used as the anode in a two-electrode configured alkaline electrolyzer with the sharp decline of energy consumption (41.55 KWh kg–1 Hydrogen) for hydrogen production. We then determine the insight of the electrocatalytic process toward water oxidation on our prepared electrode. First, the results reveal that the 3D-substrate can obviously reduce the resistance for the electron transfer during the oxygen evolution turnover. In addition, the introduction of active cobalt plating will lead to the self-supported Co-phytate nanostructures generation, which can significantly enlarge the electrochemically active surface area (EASA). Further, the electrode after catalysis is also characterized, and we find that the nanostructured cobalt oxo/hydroxide are densely grown on the original Co-phytate nanoplates. These core/shell nanocomposites not only own higher EASA but also obviously decrease the free-energy change during the O–O formation of the CoO6-based intermediate affected by the phytate group.

Metal Oxide Nanostructures Generated from In Situ Sacrifice of Zinc in Bimetallic Textures as Flexible Ni/Fe Fast Battery Electrodes

“…Moreover,a tt he same time, active materials in powder form bring further problems when fabricating flexible devices,a nd narrows the range of applications as ab inder is required during electrode preparation. Different from previous reports, [17][18][19] the electrodes can produce superior capacity without anyh eat treatments ot hat the whole process can be completed at room temperature. At the same time, these techniques are widely reported to be capable of generating surficial self-supported nanostructures, which significantly enhance the surficial area of the electrodes.…”

“…V device is the active volumeo ft wo 1 1 0.02 cm 3 coppern ets for each cell. [17,19,46] Thus, cycling stabilityo ft he battery prepared in this approachn eeds furthero ptimizationsa nd modificationsi nf uture work. Thea s-calculated energy density,s hown in Figure 6(d), reaches 7.40 Whcm À3 at the power density of 0.27 Wcm À3 ,w hich is considerably highere ven than reported carbon/metal composites.…”

“…[1] The nickel/iron battery,a lso known as the Edison battery,i s am ember of the safe and cost-efficient nickel-based aqueous alkaline batteries family.A lthough the nickel/iron system was invented over 100 years ago, [2] it has come into its second spring with the development of nanotechnology.D elicate syntheses of nanostructured nickel oxide, iron oxide,a nd metal oxide-carbon composites have been widely reported. [17][18][19] Here, we devise an in situ sacrifice process to fabricate binder-free nanostructured NiO x /FeO x electrodes from bimetallic textures at room temperature. However,w ith conventional nano synthesis, nearly all these works require ah igh-temperature process, which yields powder products.…”

One‐Step Construction of N,P‐Codoped Porous Carbon Sheets/CoP Hybrids with Enhanced Lithium and Potassium Storage

“…Briefly, a given amount of phytic acid (PA) was added to the mixture of cobalt acetate and melamine (MA) until it was changed from a slurry into a solid under magnetic stirring and then was maintained at 80 °C for 40 min to form a pink sheet-like crystalline sample (denoted as MAPACo; Figure S1, Supporting Information). [24,25] PA has a strong chelating ability, and its negative phosphate groups can easily bond with positive cobalt ions. [24,25] PA has a strong chelating ability, and its negative phosphate groups can easily bond with positive cobalt ions.…”

Photoanode-immobilized molecular cobalt-based oxygen-evolving complexes with enhanced solar-to-fuel efficiency

“…[11][12][13][14][15][16][17][18][19][20][21] In particular, the studies of nanostructured heterogeneous WOCs have become a very popular area of research recently due to their thermodynamic stability, high activity and longevity. [22][23][24] Among them, cobalt-based catalysts for water oxidation show exceptional performance, which have been reported as hot materials.…”