Nitrogen activation to reduction on a recyclable V-SAC/BN-graphene heterocatalyst sifted through dual and multiphilic descriptors

Maibam, Ashakiran; Krishnamurty, Saïlaja

doi:10.1016/j.jcis.2021.05.027

Cited by 19 publications

(8 citation statements)

References 84 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is due to the excessive hydrolysis of gelatin in this environment, resulting in the production of a large number of sub‐fluorophores (COOH, NH 2 ). [ 41 ] Alkaline condition (OH – ) will enhance the electron density on the surface of PCDs, causing a blue shift from 460 nm to 450 nm. Then we sought to better understand the RTP performance of C‐PCDs by exploring the influence of carbonate amount in preparation.…”

Section: Resultsmentioning

confidence: 99%

Carboxylate‐Induced RTP Based on Gelatin for Anticounterfeiting

Wang

Zhang

et al. 2022

Part & Part Syst Charact

View full text Add to dashboard Cite

Room‐temperature phosphorescence (RTP) from polymer carbon dots (PCDs) has attracted great attention for its potential applications in manufacturing anticounterfeit objects and digital encryption. However, most RTP raw materials with good performance are generally toxic, corrosive, and polluting, which will cause safety hazards during use and subsequent processing. Herein, facile, environmental‐friendly polymer carbon dots are prepared by hydrothermal treatment of gelatin and carboxylate (C‐PCDs) for the first time. The RTP of C‐PCDs is yellow emission and the lifetime up to 422 ms, which is three times that of PCDs produced only by gelatin. Then according to transmission electron microscope, atomic force microscopy, Fourier transform infrared, X‐ray photoelectron spectroscopy, gel permeation chromatography characterizations, and comparison of optical properties, it is found that the newly CONH formed by introduced carboxylate and free amino produced in the hydrolysis has an inhibitory effect on the hydrolysis of amide bonds contained in gelatin and deamination to a certain extent, which will be thought about more n‐π* transition from CO enhancing the conversion for triplet excitons. Moreover, the C‐PCDs with properties of fluorescence and phosphorescence are confirmed in the potential application of double anticounterfeiting under the excitation of ultraviolet lamps.

show abstract

Section: Resultsmentioning

confidence: 99%

Carboxylate‐Induced RTP Based on Gelatin for Anticounterfeiting

Wang

Zhang

et al. 2022

Part & Part Syst Charact

View full text Add to dashboard Cite

show abstract

“…[6][7][8][9][10] Taking advantage of the mild reaction condition, the electrochemical nitrogen reduction reaction (NRR) is considered as a promising way for nitrogen fixation. [11][12][13][14] However, because of the strong N�N triple bond, hydrogenation of nitrogen to produce ammonia suffers from low efficiency, and therefore searching highly active and selective electrocatalysts for NRR is still challenging.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Electroreduction on Borophene‐Supported Atomic and Diatomic Transition Metals: Stability, Activity and Selectivity Improvements via Defect‐Engineering

et al. 2022

View full text Add to dashboard Cite

The present work investigated the binding of atomically dispersed transition metals to the perfect and single/double vacancy (SV/DV)-containing defective β 12 -borophenes and the catalytic performance of those corresponding single-atom catalysts (SACs) and diatomic catalysts (DACs) for nitrogen reduction reaction (NRR) by means of density functional theory calculations. Although previous theoretical studies proposed that the inherent hexagon hole of the defect-free β 12borophene is capable of anchoring single metal atom for NRR, calculations suggested that the interaction between borophene and doped metal is not strong enough to avoid metal aggregation. For the defective β 12 -borophene with SV, even though the single metal could be stabilized in an 8-membered ring, it was found that the SAC was still ineffective for NRR because of the competitive hydrogen evolution process. Regarding the DV-containing β 12 -borophene, a defective configuration with an unexpected 11-membered hole was proved as the most stable structure, which possessed a very similar average atomic energy (6.25 eV atom À 1 ) compared to that of the pristine β 12 sheet (6.26 eV atom À 1 ). Two metal atoms could be encapsulated into the confined space of the B 11 ring. Compared to SACs, those corresponding DACs were more active for N 2 fixation and hydrogenation, and the hydrogen evolution reaction could be passivated, attributing to the synergistic effect of dual metal centres. Among all candidates, the V 2 /β 12 -DV was predicted as the most promising catalyst for NRR, with the limiting potential of as low as À 0.15 V.

show abstract

“…Different from conventional bulk catalysts, SAs represent the ultimate limit of catalysts and their maximum atom utilization efficiency. 9,10 Graphene-supported SACs, featuring well-defined homogeneous active sites, can account for both high activity and high selectivity, 11,12 with the assistance of large surface area, accessible anchoring sites and chemical stability. [13][14][15][16] Meanwhile, the N-doping strategy has exhibited notable improvement in electrocatalysis and thermocatalysis 17 since the substitution of carbon by nitrogen is fairly facile in experiments and can regulate the electronic properties of the active SA center and graphene support.…”

Section: Introductionmentioning

confidence: 99%