Positively-charged gold nanoparticles possess intrinsic peroxidase-like activity, and can catalyze oxidation of the peroxidase substrate 3,3,5,5-tetramethylbenzidine (TMB) by H2O2 to develop a blue color in aqueous solution, thus providing simple approach colorimetric detection glucose.

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...

Abstract A cost‐effective and highly efficient oxygen evolution reaction (OER) electrocatalyst will be significant for the future energy scenario. The emergence of core–shell heterostructure has invoked new feasibilities to inspire full potential non‐precious‐metal candidates. shells always have a large thickness, affording robust mechanical properties under harsh conditions, which limits exposure active sites with intrinsic reactivity extrinsic physicochemical characters optimal...

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...

The water-soluble cationic nickel(II) complex of meso-tetrakis(4-N-methylpyridyl)porphyrin (1) can electrocatalyze water oxidation to O2 in neutral aqueous solution (pH 7.0) with the onset catalytic wave appearing at ∼1.0 V (vs NHE). homogeneous catalysis 1 was verified. Catalyst exhibited activity a pH range 2.0-8.0 and had strict linear dependence current on its concentration. After 10 h constant potential electrolysis 1.32 NHE), negligible difference observed by UV-vis. In addition,...

Water oxidation is the key step in natural and artificial photosynthesis for solar-energy conversion. As this process thermodynamically unfavorable challenging from a kinetic point of view, development highly efficient catalysts with low energy cost subject fundamental significance. Herein, we report on iron-based films as water-oxidation catalysts. The can be quickly deposited onto electrodes Fe(II) ions acetate buffer at pH 7.0 by simple cyclic voltammetry. extremely iron loading critical...

ConspectusThe hydrogen evolution reaction (HER), oxygen (OER), and reduction (ORR) are involved in biological artificial energy conversions. H–H O–O bond formation/cleavage essential steps these reactions. In nature, intermediates the highly reactive short-lived, making their identification investigation difficult. catalysis, realization of reactions at considerable rates close to thermodynamic equilibria remains a challenge. Therefore, elucidation mechanisms structure–function relationships...

Nature utilizes solar energy to extract electrons and release protons from water, a process called photosynthetic water oxidation or oxygen evolution. This sunlight-driven reaction is vital the planet because it directly produces dioxygen couples with photosystem I generate reducing equivalents for reduction of carbon dioxide carbohydrates (also known as CO2 fixation). Inspired by this natural process, people are intensely interested in splitting using sunlight convert store into chemical...

Multivariate metal-organic frameworks with active Fe/Ni building blocks that are spatially arranged in an open structure synthesized and explored for oxygen evolution reaction. The heterogeneity porosity of this system prove to show synergy effect give low onset overpotential at 170 mV. These MOFs further fabricated into thin films over nickel foam by controlled electrochemical deposition improve the surface conductivity overall stability. framework film exhibits outstanding electrocatalytic...

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...

Six cobalt and manganese corrole complexes were synthesized examined as single-site catalysts for water splitting. The simple [Co(tpfc)(py)2] (1, tpfc = 5,10,15-tris(pentafluorophenyl)corrole, py pyridine) catalyzed both oxidation proton reduction efficiently. By coating complex 1 onto indium tin oxide (ITO) electrodes, the turnover frequency electrocatalytic was 0.20 s(−1) at 1.4 V (vs. Ag/AgCl, pH 7), it 1010 −1.0 0.5). stability of catalytic oxygen evolution hydrogen production evaluated...

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 Synthesizing molecule@support hybrids is appealing to improve molecular electrocatalysis. We report herein metal–organic framework (MOF)‐supported Co porphyrins for the oxygen reduction reaction (ORR) with improved activity and selectivity. can be grafted on MOF surfaces through ligand exchange. A variety of porphyrin@MOF were made using this method. Grafted showed boosted ORR large (>70 mV) anodic shift half‐wave potential compared ungrafted porphyrins. By active MOFs peroxide...

Efficient oxygen evolution reaction (OER) and reduction (ORR) are the determinants of realization a hydrogen-based society, as sluggish OER ORR bottlenecks for production utilization H2, respectively. A Co complex 5,15-bis(pentafluorophenyl)-10-(4)-(1-pyrenyl)phenylcorrole (1) bearing pyrene substituent was synthesized. When it immobilized on multiwalled carbon nanotubes (MWCNTs), 1/MWCNT composite displayed very high electrocatalytic activity durability both in aqueous solutions: catalyzed...

Several copper corrole complexes were synthesized, and their catalytic activities for hydrogen (H2) evolution examined. Our results showed that substituents at the meso positions of macrocycles played significant roles in regulating redox thus properties complexes: strong electron-withdrawing can improve catalysis evolution, while electron-donating are not favored this system. The complex 5,15-pentafluorophenyl-10-(4-nitrophenyl)corrole (1) was shown to have best electrocatalytic performance...

Abstract Water splitting is promising to realize a hydrogen‐based society. The practical use of molecular water‐splitting catalysts relies on their integration onto electrode materials. We describe herein the immobilization cobalt corroles carbon nanotubes (CNTs) by four strategies and compare performance resulting hybrids for H 2 O evolution. Co can be covalently attached CNTs with short conjugated linkers (the hybrid denoted as H1 ) or long alkane chains ( H2 ), grafted via strong π–π...

A PVP-assisted pyrolysis strategy that can simply but efficiently transform zeolitic imidazolate framework-67 (ZIF-67) into a Co-embedded N-enriched meso/microporous carbon material (Co-NC) is reported for the first time.

Abstract Nitrogen‐doped graphene could catalyze the electrochemical reduction and evolution of oxygen, but unfortunately suffers from sluggish catalytic kinetics. Herein, for first time, we report an onion‐like carbon coated Co, N‐doped (OLC/Co‐N‐C) material, which possesses multilayers highly curved nanostructures that form mesoporous architectures. These unique nanospheres are produced when surfactant micelles introduced to synthesis precursors. Owing combined electronic effect...

Low overpotential water oxidation under mild conditions is required for new energy conversion technologies with potential application prospects. Extensive studies on molecular catalysis have been performed to gain fundamental knowledge the rational designing of cheap, efficient and robust catalysts. We herein report a water-soluble CuII complex tetrakis(4-N-methylpyridyl)porphyrin (1), which catalyzes oxygen evolution reaction (OER) in neutral aqueous solutions small overpotentials: onset...

The increasing global energy and environmental crises make it urgent to find use renewable, clean, environmentally benign new resources. New conversion schemes based on small molecule activation reactions, including hydrogen evolution reaction (HER), oxygen (OER), reduction (ORR), have been proposed. For example, catalytic water splitting provides a promising way convert solar chemical energy, which is stored as the fuel. Hydrogen oxidation in fuel cells an energy-releasing process generate...

Electrodes for oxygen evolution reaction (OER) and reduction (ORR) are required in energy conversion storage technologies. An assembly strategy involves covalently grafting Co corrole 1 onto Fe3 O4 nanoarrays grown on Ti mesh. The resulted electrode shows significantly improved activity durability OER ORR neutral media as compared to alone with directly adsorbed 1. It also displays higher atom efficiency (at least two magnitudes larger turnover frequency) than reported electrodes. Using this...