Plasmonics
has emerged as a promising methodology to promote chemical
reactions and has become a field of intense research effort. Ag nanoparticles
(NPs) as plasmonic catalysts have been extensively studied because
of their remarkable optical properties. This review analyzes the emergence
and development of localized surface plasmon resonance (LSPR) in organic
chemistry, mainly focusing on the discovery of novel reactions with
new mechanisms on Ag NPs. Initially, the basics of LSPR and LSPR-promoted
photocatalytic mechanisms are illustrated. Then, the recent advances
in plasmonic nanosilver-mediated photocatalysis in organic transformations
are highlighted with an emphasis on the related reaction mechanisms.
Finally, a proper perspective on the remaining challenges and future
directions in the field of LSPR-promoted organic transformations is
proposed.
Development of highly efficient electrocatalyst for the oxygen evolution reaction (OER) is urgently demanded by the clean hydrogen energy. Herein, in order to further boost the OER activity of metal nitrate hydroxide materials, amorphous Fe(OH) 3 layer is in situ grown on nickel nitrate hydroxide (NiNH) nanoarrays supported on nickel foam (NF) through an interfacial hydrolysis approach, where the loading amount of the Fe(OH) 3 can be simply manipulated by the hydrolysis time. Taking advantage of the synergy of Fe(OH) 3 and NiNH, the optimized Fe(OH) 3 @NiNH/NF sample shows a very promising electrocatalytic OER activity in 1 M KOH solution, requiring a very low overpotential of 212 mV vs. reversible hydrogen electrode (RHE) to deliver a geometrical catalytic current density of 100 mA cm −2 and a low Tafel slope of 49 mV dec −1 . This work provides a new strategy for boosting the electrocatalytic activity of metal hydroxide nitrates through the interface engineering.
Herein, with two-dimensional (2D) borocarbonitride (BCN) as a metal-and plasmon-free surface-enhanced Raman scattering (SERS) platform, we demonstrate a band structure engineering strategy to facilitate the charge transfer process for an enhanced SERS response. Especially, when the conduction band of the BCN substrate is tuned to align with the LUMO of the target molecule, remarkable SERS performance is achieved, ascribed to the borrowing effect from the vibronic coupling of resonances through the Herzberg−Teller coupling term. Meanwhile, fluorescence quenching is achieved due to the efficient charge transfer between the BCN substrate and target molecule. Consequently, BCN can accurately detect 20 kinds of trace chemical and bioactive analytes. Moreover, BCN exhibits excellent thermal and chemical stability, which can not only withstand high-temperature (300 °C) heating in the air but also resist long-term corrosion in harsh acid (pH = 0, HCl) and base (pH = 14, NaOH). This work provides new insight into band structure engineering in promoting the SERS performance of plasmon-and metal-free semiconductor substrates.
Herein a facile synthesis methodology is reported that results in a unique 3D NiSe@Ni1−xFexSe2 core–shell nanostructure on nickel foam substrate, where Ni1−xFexSe2 nanosheets are fabricated on NiSe nanowires through an iron‐doping‐induced phase transformation process under solvothermal conditions. This material demonstrates stable hydrogen and oxygen evolution activity in 1.0 m KOH with a small overpotential of 153 mV@−10 mA cm−2 and 236 mV@100 mA cm−2, respectively. Furthermore, an efficient and stable water electrolyzer with NiSe@Ni1−xFexSe2/nickel foam as both anode and cathode is fabricated, which requires a low overpotential of 1.60 V to deliver a current density of 10 mA cm−2. Such ion‐doping‐induced phase transformation paves a new way for fabricating highly efficient electrocatalysts for energy storage and conversion.
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