Abstract Artificial photosynthesis provides a blueprint to harvest solar energy sustain the future demands. Solar‐driven water splitting, converting into hydrogen energy, is prototype of photosynthesis. Various systems have been designed and evaluated understand reaction pathways and/or meet requirements potential applications. In solar‐to‐hydrogen conversion, electrocatalytic oxygen evolution reactions are key research areas that meaningful both theoretically practically. To utilize fuel...

A porous Ni–Fe oxide with improved crystallinity has been prepared as a highly efficient electrocatalytic water oxidation catalyst. It small overpotential, low Tafel slope, and an outstanding stability. The remarkably performance is due to the structure, high extent homogeneous iron incorporation, ameliorative crystallinity, mass transfer resistance. Water splitting for generation of clean sustainable energy resource represents one most promising processes toward environmental remediation.1...

The development of new materials/structures for efficient electrocatalytic water oxidation, which is a key reaction in realizing artificial photosynthesis, an ongoing challenge. Herein, Co(OH)F material as electrocatalyst the oxygen evolution (OER) reported. as‐prepared 3D microspheres are built by 2D nanoflake building blocks, further woven 1D nanorod foundations. Weaving and substructures (1D nanorods nanoflakes) provides high structural void porosity with sufficient interior space...

NiFe film for oxygen evolution reaction (OER): An ultrathin NiFe-hydroxide is generated by stepwise electrodeposition with a significantly improved catalytic OER activity, as compared to films obtained using traditional methods. The turnover frequency of 8.7 s−1 at an overpotential 329 mV extraordinary and represents the highest value among heterogeneous catalysts. As service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed...

Abstract Nature uses Fe porphyrin sites for the oxygen reduction reaction (ORR). Synthetic porphyrins have been extensively studied as ORR catalysts, but activity improvement is required. On other hand, rarely shown to be efficient evolution (OER). We herein report an enzyme‐inspired 1 catalyst both and OER. Complex , which bears a tethered imidazole binding, beats imidazole‐free analogue 2 with anodic shift of half‐wave potential by 160 mV decrease OER overpotential 150 get benchmark...

Abstract The oxygen evolution reaction (OER) remains a bottleneck for the overall water splitting. Electrocatalysts with superior activity and stability are still highly desired. Herein, stepwise electrochemical strategy is developed to prepare Co(OH) 2 /NiP x nanosheet arrays intimate abundant heterostructures. nanosheets, which first electrodeposited on blank carbon cloth electrode, serve as substrate nucleation growth of NiP . resultant heterointerfaces well regulated by altering loading...

Although aqueous synthesis of nanocrystals is advantageous in terms the cost, convenience, environmental friendliness, and surface cleanness product, Pt non-noble metal alloys are difficult to obtain with controlled morphology composition from this owing a huge gap between reduction potentials respective salts. This could now be remedied by introducing sulfite into synthesis, which believed resemble an electroless plating mechanism, giving rise colloid Pt-M (M=Ni, Co, Fe) alloy nanowires...

An integrated electrode with autologous catalyst-support features is designed for highly efficient water oxidation. The high performance arises from consubstantial growth of Ni(OH)2 on metallic Ni substrate by a controlled surface oxidation protocol. feature between the catalyst and support brings extremely charge transfer toward unprecedented activity affords excellent system stability. As service to our authors readers, this journal provides supporting information supplied authors. Such...

Carbon-supported bimetallic PtmNin electrocatalysts with different Pt/Ni atomic ratios were synthesized through a modified polyol process. The as-prepared characterized by X-ray diffraction, transmission electron microscopy, voltammetry techniques, and single-cell tests. It was revealed that the nanoparticles uniformly distributed on carbon supports average diameters of about 3 nm. Pt Ni partially alloyed, indicated decreased lattice constants compared pure Pt. results electrochemical...

The correlation between metal coordination and electrocatalytic water oxidation performance is elusive in many cobalt-based materials. Herein, we designed an ideal Co phosphate-based platform to explore the effect of environment on oxygen evolution reaction (OER) activity. cobalt geometry was modulated from octahedral tetrahedral by simple removal ligands Co3 (PO4 )2 ⋅8 H2 O. Other features except structure two autologous materials remain similar. analogues display same OER kinetics, but...

The oxygen reduction reaction (ORR) is of significant importance in the development fuel cells. Now, cobalt-nitrogen-doped chiral carbonaceous nanotubes (l/d-CCNTs-Co) are presented as efficient electrocatalysts for ORR. template, N-stearyl-l/d-glutamic acid, induces self-assembly well-arranged polypyrrole and formation ordered graphene carbon with helical structures at molecular level after pyrolysis process. Co was subsequently introduced through post-synthesis method. obtained...

We constructed a series of novel optical sensors for determination broad-range pH based on single fluorophore and multi-ionophores with different pKa values. These use photoinduced electron transfer (PET) as the signal transduction follow design concept "fluorophore-spacer-receptor (ionophore)" which employs 4-amino-1,8-naphthalimide fluorophore, ethyl moiety spacer, phenols anilines receptors. Key to successful development this sensor system is that coupling receptors six values produces...

Cobalt complexes have been extensively explored in catalyzing the oxygen reduction reaction (ORR), which is cathode fuel cells. Although they show high activities, mononuclear Co typically mediate 2e of O2 to H2O2, and two sites are generally required catalyze 4e H2O. Herein we report significantly improved efficiency covalently grafted corroles on carbon nanotubes (CNTs) for ORR. Azide-containing can be attached alkyne-modified CNTs via azide–alkyne cycloaddition. This attachment avoid...

By a simple and fast electrosynthesis method, NiP_x nanospheres are deposited on electrode substrates, which could catalyze HER efficiently in neutral solution.

Abstract Carbon‐neutral hydrogen has potential to alleviate the energy crisis and ease environmental problems. Water electrolysis is a sustainable way for large‐scale production when electricity generated from renewable resources. The key challenge in water splitting sluggish kinetics of oxygen evolution reaction (OER). Thus, it important necessary develop highly efficient electrocatalysts cost‐effective OER. Porous materials have proven be versatile catalysis due their large surface area,...

Molybdenum sulfide (MoS2 ) is a layered material with high activity for electrocatalytic hydrogen evolution reaction (HER). In conventional MoS2 , the electrical resistance between layers hampers bulk charge transfer and therefore greatly limits its performance in electrolysis. Herein, ultrathin nanosheets bent on reduced graphene oxide (RGO) are reported. sharp contrast to resulting has mostly 1 or 2 layers, layer distance significantly expanded ≈1 nm. From computational studies, prepared...

NiFe-based materials have shown impressive electrocatalytic activity for the oxygen evolution reaction (OER). The mutual effect between proximate Ni and Fe atoms is essential in regulating electronic structure of active site to boost OER kinetics. Detailed studies confirm that separated monometal phases are detrimental OER. Thus, high-level blending electrocatalysts critical. Herein, an NiFe oxalate nanomesh array based on solid solutions nickel (II) iron prepared through a facile...

Aligned cobalt metal nanoparticles were prepared from the pyrolysis of oxalate nanoplate precursors for efficient electrocatalytic water oxidation.

Sponge-like Ni3N/NC was prepared through a facile approach and examined as catalyst for the oxygen evolution reaction (OER). This material can efficiently catalyze water oxidation to reach current density of 10 mA cm-2 with small overpotential 310 mV in 1.0 M KOH aqueous solution. The high efficiency be attributed good electronic conductivity, large specific surface area fast mass diffusion ability Ni3N/NC.

A simple, highly selective and sensitive fluorescence-enhanced cyanide chemosensor <bold>L</bold> using an acylhydrazone group as a binding site naphthalene the fluorescence signal was designed synthesized.

The slow kinetics of water oxidation greatly jeopardizes the efficiency electrolysis for H2 production. Developing highly active electrodes with affordable fabrication costs is thus great importance. Herein, a NiII FeIII surface species on Ni metal substrate was generated by electrochemical modification in ferrous solution fast, simple, and cost-effective procedure. In prepared catalyst film, incorporated uniformly through controlled FeII cations electrode surface. catalytically originated...

Abstract Understanding the structure‐activity correlation is an important prerequisite for rational design of high‐efficiency electrocatalysts at atomic level. However, effect coordination environment on electrocatalytic oxygen evolution reaction (OER) remains enigmatic. In this work, regulation proton transfer involved in water oxidation by engineering based Co 3 (PO 4 ) 2 and CoHPO reported. The HPO 2− anion has intermediate p K a value between Co(II)‐H O Co(III)‐H to be served as...