Nitrogen Functionalities Research Articles

Hydrothermal nitrogen doping of anthracene oil-derived activated carbons for wide voltage asymmetric capacitors

This work focused on the development of doping procedures to introduce nitrogen functionalities on an activated carbon derived from anthracene oil to be subsequently used on wide voltage asymmetric capacitors. For that, ammonia solution was used and different hydrothermal conditions applied. Tailoring the temperature treatment (120 and 180 °C), nitrogen-doped activated carbons (N-ACs) with different nitrogen content (5.6 and 4.1 at. %) and diverse speciation were obtained. N-ACs exhibited excellent capacitive behavior and long-life cycle in a three-electrode cell using KOH aqueous solution as electrolyte. The significant capacitance value of 291 F g−1 at 0.2 A g−1 was achieved by the N-AC obtained at 180 °C. Furthermore, full carbon asymmetric supercapacitors incorporating N-ACs as negative electrodes were assembled, and an operating voltage window of 1.3 V in 6 M KOH solution established. As a result, high energy densities were achieved in the devices, particularly in that including N-AC-180. Electrochemical tests revealed that pyridinic and quaternary nitrogen species of N-ACs play a critical role in the excellent asymmetric supercapacitor electrochemical performance, including improvement of conductivity and specific capacitance.

Study on the coordination conduct and kinetic insights within the oxo-vanadate and organic reductive nitrogen and sulfur functionalities during the reduction coupled adsorption processes: Implications in practical applications

Vanadium(V) is arising wastewater contaminant recently. Although bio-reduction of vanadium(V) is effective, the knowledge of electron transfer pathways and coordination nature by cellular organic functionalities is seriously lacking. Herein, the coordination conduct and kinetic modes for the reduction of V(V) by organic nitrogen and sulfur functionalities in working pHs are comprehensively investigated for the first time. The kinetics follow 3 steps; (1) diffusion of V(V) species, (2) reduction of V(V) to V(IV), and (3) adsorption of existing V species. The diffusion of V(V) is controlled by the protonated =NH2+, −SH2+, −CSH+ functional groups and oxo-vanadate speciation. The reduction of V(V) to V(IV) was efficient by −SH than =NH, −NH− , because of the higher oxidation potential of sulfur and which acted as the sole electron donor in the process. The coordination of V(V)/V(IV) species interacted with oxygen, nitrogen and sulfur atoms via parallel orientation and leads to multi-docking or single-ionic interactions, revealing the previously unrecognized track. Hence, the system tested in four types of wastewaters with different pHs and resulted the comprehensive practical applicability of the system. This study proposes a novel tactic to design an efficient V(V) wastewater treatment system by considering its water parameters.

Aerobic C-N Bond Formation through Enzymatic Nitroso-Ene-Type Reactions.

The biocatalytic oxidation of acylated hydroxylamines enables the direct and selective introduction of nitrogen functionalities by activation of allylic C-H bonds. Utilizing either laccases or an oxidase/peroxidase couple for the formal dehydrogenation of N-hydroxycarbamates and hydroxamic acids with air as the terminal oxidant, acylnitroso species are generated under particularly mild aqueous conditions. The reactive intermediates undergo C-N bond formation through an ene-type mechanism and provide high yields both in intramolecular and intermolecular enzymatic aminations. Investigations on different pathways of the two biocatalytic systems and labelling studies provide more insight into this unprecedented promiscuity of classical oxidoreductases as catalysts for nitroso-based transformations.

Multifunctional carbon nitride nanoarchitectures for catalysis.

Catalysis is at the heart of modern-day chemical and pharmaceutical industries, and there is an urgent demand to develop metal-free, high surface area, and efficient catalysts in a scalable, reproducible and economic manner. Amongst the ever-expanding two-dimensional materials family, carbon nitride (CN) has emerged as the most researched material for catalytic applications due to its unique molecular structure with tunable visible range band gap, surface defects, basic sites, and nitrogen functionalities. These properties also endow it with anchoring capability with a large number of catalytically active sites and provide opportunities for doping, hybridization, sensitization, etc. To make considerable progress in the use of CN as a highly effective catalyst for various applications, it is critical to have an in-depth understanding of its synthesis, structure and surface sites. The present review provides an overview of the recent advances in synthetic approaches of CN, its physicochemical properties, and band gap engineering, with a focus on its exclusive usage in a variety of catalytic reactions, including hydrogen evolution reactions, overall water splitting, water oxidation, CO2 reduction, nitrogen reduction reactions, pollutant degradation, and organocatalysis. While the structural design and band gap engineering of catalysts are elaborated, the surface chemistry is dealt with in detail to demonstrate efficient catalytic performances. Burning challenges in catalytic design and future outlook are elucidated.

Effects of controlled low central venous pressure combined with dexmedetomidine on the blood loss, renal function and cognitive function in patients undergoing laparoscopic hepatectomy

This study aims to investigate the effects of controlled low central venous pressure combined with dexmedetomidine on the blood loss, renal function and cognitive function in patients undergoing laparoscopic hepatectomy. From January 2021 to October 2022, 90 patients treated with laparoscopic hepatectomy in Huai’an First People’s Hospital were selected as subject objects and equally divided into the study group and control group in a random method. The blood loss, surgical duration, duration of hepatic portal occlusion, serum bilirubin, creatinine, urea nitrogen, hemoglobin, plasma albumin, interleukin (IL)-6 and cognitive function in the two groups were compared. Patients in the study group receiving the combination of controlled low central venous pressure and dexmedetomidine showed less blood loss and shorter time of hepatic portal occlusion as compared to the control group. The levels of serum bilirubin, creatinine and urea nitrogen were significantly increased at postoperative 3 days compared with preoperation in the study and control groups. In particular, these factors were higher in control group than that in the control group at postoperative 3 days, indicating better liver function and renal function of patients in the study group than those in the control group. The levels of hemoglobin and plasma albumin observed in study group 3 days after surgery were higher than those in the control group. At 1 day after surgery, the level of IL-6 was significantly lower in the study group than that in the control group. Patients in the study group achieved significantly higher mini-mental state examination (MMES) scores than those in the control group at postoperative 1 day, 3 days and 7 days. The controlled low central venous pressure combined with dexmedetomidine is a promising clinical practice in decreasing blood loss, improving the liver and kidney function, and protecting the cognitive function of patients during laparoscopic hepatectomy.

Role of nitrogen doping and pore volume for CO2 capture in metal-organic framework derived ultramicroporous carbon material

We report the synthesis of four MOF-derived nitrogen and oxygen co-doped ultramicroporous/microporous carbon (MNOUCs) at different carbonization temperatures and their applications as adsorbents for efficient CO2 capture. MNOUC-900, carbonized at 900 ℃ having the highest surface area of 1320 m2/g and highest ultramicropore volume of 0.205 cm3 g−1 showed the maximum CO2 uptake of 4.65 mmol g−1 at 0 ℃ and 1 bar. Contrary to this, MNOUC-600, which was synthesized at 600 ℃ showed the highest CO2/N2 selectivity of 31. This study revealed that CO2 uptake had been found to be correlated with ultramicropore volume while selectivity (CO2 vs N2) improves with increasing basic nitrogen functionalities such as pyridinic and pyrollic. The heat of adsorption values was found to be 25–40 kJ mol−1 suggesting the physisorption nature of the interaction. Dynamic CO2 uptake experiment was performed for MNOUC-900, which revealed its good efficiency to be used as a CO2 adsorbent.

Experimental and modelling studies of carbon dioxide capture onto pristine, nitrogen-doped, and activated ordered mesoporous carbons.

The search for suitable materials for carbon dioxide capture and storage has attracted the attention of the scientific community in view of the increased global CO2 levels and its after-effects. Among the different materials under research, porous carbons and their doped analogues are extensively debated for their ability to store carbon dioxide at high pressures. The present paper examined high-pressure carbon dioxide storage studies of 1-D hexagonal and 3-D cubic ordered mesoporous pristine and N-doped carbons prepared using the nano-casting method. Excess carbon dioxide sorption isotherms were obtained using the volumetric technique and were fitted using the Toth model. Various parameters that influence CO2 storage on metal-free ordered mesoporous carbons, such as the effect of pore size, pore dimension, pyrolysis temperature, the impact of nitrogen substitution, and the effect of ammonia activation are discussed. It was observed that the carbon dioxide storage capacity has an inverse relation to the total nitrogen doped, the amount of pyridinic nitrogen functionality, and the pyrolysis temperature, whereas the pore size seems to have a linear relationship. On the other hand, the presence of oxygen has a positive effect on the sorption capacity. Among the prepared ordered mesoporous carbons, the ammonia-treated one has shown the highest adsorption capacity of 37.8 mmol g-1 at 34 bar and 0 °C.

Functional Compound Changes during Postharvest Physiological Deterioration of Cassava Tuber

Reducing the economic value of the cassava tuber crop, thereby Postharvest Physiological Deterioration (PPD) is the major problem in cassava that renders the tuber unmarketable. After harvest of cassava tuber causing fluorescence in the storage parenchyma was observed, because changes in metabolic compound mainly responsible for the fluorescence. Its content peaks within 24 hours of injury and prior to the development of the visual symptoms of physiological deterioration. The present study of Fourier infrared transform spectroscopy (FTIR) was performed with CI 850, YTP 1, H740/92 and H226 cassava genotypes to identify the functional compound changes during Postharvest Physiological Deterioration. FTIR spectroscopy is a technique based on the determination of the interaction between infrared (IR) radiation and a sample. The present study revealed that the extracts of fresh cassava tuber and stored tubers of different cassava genotypes, has potential to produce bioactive functional compounds like hydrocarbons, oxygen compounds, nitrogen containing compounds, isocyanates, thiocyanide, cyanide, isothiocyanates, oxidized nitrogen functions, sulfur compounds, phosphorous and amides but their quantity was differently in cassava genotypes which correlate with reinforcement of tolerance to PPD under storage condition.

Soil bacterial community structure and functions but not assembly processes are affected by the conversion from monospecific Cunninghamia lanceolata plantations to mixed plantations

Forest conversion from monoculture plantations to mixed plantations has profound effects on ecological functions as well as soil bacterial community structure, and the creation of mixed plantations may substantially increase soil bacterial diversity. However, the potential function of soil nitrogen (N) cycling and the soil bacterial community assembly altered by forest conversion remain poorly understood. At Meicheng Forest Farm in 2018, we investigated the impacts of forest conversion on soil bacterial compositions and functions related to N cycling, bacterial networks, and assembly processes. The results showed that (1) soil bacterial composition and β diversity, but not α diversity, were significantly influenced by forest management practices; (2) forest conversion had profound effects on N cycling processes, especially N fixation, including the abundance of the N-fixing genera Bradyrhizobium, Burkholderia, and Geobacter, which increased in the mixed plantations; (3) bacterial network analysis showed that keystone taxa (i.e., Gemmatimonas in the mixed plantations and Gp2 in the pure plantations) might play key roles in bacterial networks, and mixed plantations seemed to have more complex network structures; and (4) stochastic processes, especially ecological drift, were predominant in bacterial community assembly processes, which remained unchanged under different management practices. Soil pH may affect bacterial community assembly processes. Overall, our study revealed distinct patterns of soil microbial compositions, especially among N cycling-related bacteria, between different forest management practices and further enhanced our understanding of how forest conversion affects potential microbial functioning and assembly processes.

A novel method to greener carbon material for CO2 adsorption

This study explores the chemical activation using K2CO3 and Fe(NO3)3 to alter the porous structure and a novel nitrogen functionalisation biomass derived carbon using cold plasma. The results showed that the obtained walnut shell carbon demonstrated a remarkable CO2 adsorption capacity of 5.69 mmol g−1 at 0°C, 1 bar and 3.94 mmol g−1 at 25°C, 1 bar. Further assessment of adsorption capacities at high pressures (up to 4 bar) demonstrated the adsorption capacity of 8.03 mmol g−1 at 0°C, 4 bar and 6.33 mmol g−1 at 25°C, 4 bar. Cold plasma is a novel method to increase the nitrogen functional group content to 10.37 at%. This study showed that, however, surface nitrogen functional groups do not contribute to CO2 adsorption, and despite the presence of nitrogen groups, physisorption is the dominant factor controlling the CO2 adsorption of walnut shell derived carbon.

Efficient removal and recovery of Cd2+ from aqueous solutions by capacitive deionization (CDI) method using biochars

Biochars are low-cost and sustainable materials for environmental technologies. In this work, we prepared three biochars using pomelo peel (P-BC), algae (A-BC), and corncob (C-BC) to recover Cd2+ from wastewater via capacitive deionisation (CDI). A-BC possesses the highest amount of mesopores and nitrogen functionality and attains the highest removal of Cd2+ via physical adsorption. For the electro-sorption capacity, C-BC and A-BC perform better capacitive removal of Cd2+ than P-BC due to the smaller charge-transfer and mass-transfer resistances. Also, this work investigated the impacts of surface morphology, cell voltage, NaCl, initial pH, and Cd2+ concentrations on Cd2+ capacitive removal and electrode regeneration performances. The results indicated that A-BC and C-BC may be prospective materials for Cd2+ removal from wastewater by CDI. However, the presence of competing cations at high concentrations may influence the removal of Cd2+ at a low level, requiring the modification of A-BC and C-BC in future work.

Treatment of congenital cytomegalovirus infection.

Congenital cytomegalovirus (CMV) is the most common cause of congenital infection worldwide, the most common nongenetic cause of sensorineural hearing loss in children, and a cause of neurodevelopmental disorders in the brain. Infants with symptomatic congenital CMV infection may benefit from hearing and neurodevelopmental outcomes, particularly if antiviral treatment is initiated within the first month of life. Infants with life-threatening symptoms are recommended to receive 2-6 weeks of intravenous ganciclovir and then switch to oral valganciclovir, and those without life-threatening symptoms are recommended to use oral valganciclovir during the entire 6-month period. During antiviral drug treatment, absolute neutrophil count, platelet count, blood urea nitrogen, creatinine, and liver function tests were performed to identify neutropenia, thrombocytopenia, renal failure, and liver failure. This review investigated the evidence to date of treating congenital CMV infection.

Development of an effective asphaltene-derived adsorbent for wastewater treatment: Characterization and methyl orange removal study

Conversion of asphaltene, an undesirable and abundant waste from the petroleum industry, to value-added products can offer sustainability and economic benefit. In this study, asphaltene was acid-treated to become a low-cost and effective adsorbent for removing dye from wastewater. It was hypothesized that asphaltene functionalization with acids will change the surface properties of asphaltene, leading to improved adsorption capabilities. Through acid treatment, the surface area of asphaltenes was increased and oxygen or nitrogen functionalities were incorporated into their structure confirmed by Fourier-transform infrared spectroscopy (FTIR), elemental analysis, Scanning Electron Microscopy (SEM) images, and nitrogen adsorption-desorption isotherm. Batch adsorption experiments were conducted to evaluate the capacity of modified asphaltenes to remove methyl orange (MO) from aqueous solutions. The effect of asphaltene modification techniques, MO solution pH (3−11), asphaltene dosage (0.5–10.0 g/L), contact time, and experimental temperature (25–45 °C) were evaluated. The adsorption removal percentage of MO by modified asphaltene was about three times higher than that of non-modified asphaltene. Modified asphaltene had a maximum adsorption capacity of 7.9 mg/g at 25 °C and a solution pH of 3. Moreover, it is shown that Freundlich isotherm, pseudo-second-order, and intra-particle diffusion kinetic models describe the adsorption process very well. Finally, the regeneration of the asphaltene was achieved using ethanol, and the MO removal efficiency can still be as high as 64 % after 5 cycles (initial removal efficiency is 96 %). This study indicates that the modified asphaltene can be used as a low-cost adsorbent for treating wastewater containing dyes and other organic contaminants.

Highly humified nitrogen-functionalized lignite activated by urea pretreatment and ozone plasma oxidation

A cost-effective and energy-efficient nitro-humification process (urea pretreatment and ozone plasma oxidation) was developed for nitrogen functionalization and activation of the humic substances (HSs) of lignite. Different nitro-humification metrics, i.e., solubility, physicochemical properties, oxidation degree, nitrogen functionalization, spectral ratios, and surface functionalization, along with energy efficiency and economic profitability, were determined for the processed lignite. The best solubility metrics for the lignite were obtained under 3 wt% ozone, 10 wt% KOH, and 20 wt% urea. The selected conditions could increase alkali- and water-soluble HSs by 2.25 and 2.94 times, respectively, compared with the conventional alkaline extraction method. The process could result in a balanced distribution between nitrogen binding forms. The functionalized lignite showed a 14.5% reduction in the carbon content due to ozone oxidation and an 8.15% nitrogen enrichment due to urea pretreatment, leading to an ideal C/N ratio (5.6%) and a higher O/C ratio (0.94). The humification index (E4/E6 ratio of 6.8) and salt index (46.21%) were acceptable. The process could increase the cation exchange capacity of the lignite by 3.83 times while enhancing its carboxylic and phenolic groups by 215.87% and 85.71%, respectively. The crystallinity index of the processed lignite was increased by 2 times, and the availability of its macro-micronutrients and rare earth elements was increased by 6.35 times and 43.38%, respectively. The nitro-humic products showed lower heavy metals with higher micropores-mesopores in a globular-like and heterogeneous porous structure. The proposed method could increase the process energy efficiency by 59.91% while discounting the production costs by 43%.

Unraveling Genomic Regions Controlling Root Traits as a Function of Nitrogen Availability in the MAGIC Wheat Population WM-800.

An ever-growing world population demands to be fed in the future and environmental protection and climate change need to be taken into account. An important factor here is nitrogen uptake efficiency (NUpE), which is influenced by the root system (the interface between plant and soil). To understand the natural variation of root system architecture (RSA) as a function of nitrogen (N) availability, a subset of the multiparent advanced generation intercross (MAGIC) winter wheat population WM-800 was phenotyped under two contrasting N treatments in a high-throughput phenotyping system at the seedling stage. Fourteen root and shoot traits were measured. Subsequently, these traits were genetically analyzed using 13,060 polymorphic haplotypes and SNPs in a genome-wide association study (GWAS). In total, 64 quantitative trait loci (QTL) were detected; 60 of them were N treatment specific. Candidate genes for the detected QTL included NRT1.1 and genes involved in stress signaling under N-, whereas candidate genes under N+ were more associated with general growth, such as mei2 and TaWOX11b. This finding may indicate (i) a disparity of the genetic control of root development under low and high N supply and, furthermore, (ii) the need for an N specific selection of genes and genotypes in breeding new wheat cultivars with improved NUpE.

Novel Nitrogen‐Doped Porous Carbon with High Surface Areas Prepared from Industrial Alkali Lignin for Supercapacitors

AbstractAs a waste of the pulp and papermaking industry, industrial alkali lignin (IAL) was employed to prepare nitrogen‐doped porous carbon by pre‐carbonizing of lignin under a N2 atmosphere at 400 °C and carbonizing with the assistance of urea at 800 °C for 1 h. The porosity and surface chemical properties of the obtained porous carbons strongly depended on the alkaline environment of the lignin. The obtained porous carbons showed specific surface areas ranging from 1.759 m2 g−1 to 1482 m2 g−1 and nitrogen contents of 1.12 % to 7.78 %. The unique microstructure and nitrogen functionalities endowed the porous carbon with a high capacitance of 283.4 F g−1 in 6 mol L−1 KOH aqueous electrolytes. In addition, the optimal porous carbon exhibited excellent rate capability (212.0 F g−1 at 20 A g−1) and cycle durability (97.6 % after 10000 charge‐discharge cycles), making it a promising electrode material for supercapacitors.

The effect of pyrolysis temperature on the N conversion of biochar derived from the residue of Chlorella vulgaris after lipid extraction

The application of biomass-based carbon materials in catalyzing oxygen reduction reactions has gained a renewed momentum due to their abundant heteroatoms and inherent structures. In this study, the effect of pyrolysis temperature on the nitrogen conversion of nitrogen-enriched biomass waste-microalgae residue carbon catalysts, and their application in microbial fuel cells, were studied. Temperature exhibits a significant impact on the effective nitrogen functional groups, playing a vital role in the oxygen reduction reaction process. Results revealed that an interconversion may occur among the nitrogen functionalities, where Pyrrolic-N, which is the dominant N formed at 700 ℃, was converted to Pyridinic-N as the temperature increased to 800 ℃. Graphitic-N has the best thermal stability; thus, it occupies the highest ratio at 900 ℃. In addition, the increment in temperature resulted in the loss of nitrogen. The biochar prepared at 800 ℃ exhibited the most outstanding oxygen reduction reaction activity (0.8444 V vs. RHE), due to its relatively high nitrogen content (5.75 at%), more active nitrogen forms (Pyridinic-N and Graphitic-N) and appropriate pore structure. The maximum power density of a microbial fuel cell assembled with MRC-800 as cathode catalyst was 442.5 mW m−2. This research not only presents a fundamental study on the nitrogen conversion of biochar, but also provides a promising metal-free electrode catalyst for microbial fuel cells.

Influence of salinity on the diversity and composition of carbohydrate metabolism, nitrogen and sulfur cycling genes in lake surface sediments.

Exploring functional gene composition is essential for understanding the biogeochemical functions of lakes. However, little is known about the diversity and composition of biogeochemical cycling genes and their influencing factors in saline lakes. In this study, metagenomic analysis was employed to characterize the diversity and composition of microbial functions predicted from genes involved in carbohydrate metabolisms, nitrogen, and sulfur cycles in 17 surface sediments of Qinghai-Tibetan lakes with salinity ranging from 0.7 to 31.5 g L-1. The results showed that relative abundances of carbohydrate-active enzyme (CAZy), nitrogen, and sulfur cycling genes were 92.7-116.5, 15.1-18.7, 50.8-63.9 per 1,000 amino acid coding reads, respectively. The Shannon diversity indices of CAZy and sulfur cycling genes decreased with increasing salinity, whereas nitrogen cycling gene diversity showed an opposite trend. Relative abundances of many CAZy (i.e., carbohydrate-binding module and carbohydrate esterase), nitrogen (i.e., anammox and organic degradation and synthesis) and sulfur (i.e., dissimilatory sulfur reduction and oxidation, link between inorganic and organic sulfur transformation, sulfur disproportionation and reduction) cycling gene categories decreased with increasing salinity, whereas some CAZy (i.e., auxiliary activity), nitrogen (i.e., denitrification) and sulfur (i.e., assimilatory sulfate reduction and sulfur oxidation) gene categories showed an increasing trend. The compositions of CAZy, nitrogen, and sulfur cycling genes in the studied lake sediments were significantly (p < 0.05) affected by environmental factors such as salinity, total organic carbon, total nitrogen, and total phosphorus, with salinity having the greatest influence. Together, our results suggest that salinity may regulate the biogeochemical functions of carbohydrate metabolisms, nitrogen, and sulfur cycles in lakes through changing the diversity and composition of microbial functional genes. This finding has great implications for understanding the impact of environmental change on microbial functions in lacustrine ecosystems.

Atomization driven crystalline nanocarbon based single-atom catalysts for superior oxygen electroreduction

Atom-migration-trapping (AMT) is an effective and straightforward strategy for fabricating single-atom catalysts (SACs), but understanding the mechanism and effects of anchoring sites on AMT are formidable challenges. Here, we demonstrate that AMT phenomena occurs in crystalline porous nanocarbon, which allows development of highly efficient SACs via systematic investigation of atomization process and chemical state of active sites. An arc discharge-based bottom-up synthesis can generate an ideal porous nanocarbon with controllable nitrogen functionality, containing metal nanoparticles for AMT. Pre-formed N-functionalities in as-synthesized catalyst play important role in capturing single metal species, while additional ammonia treatment successfully modulates coordination geometry of active sites. The atomic cobalt catalyst exhibits superior oxygen reduction activity with remarkable power performance in single-cell experiments (752 mW cm−2), exceeding the reported Co-N atomic catalysts. Our findings provide not only new perspectives in AMT phenomena but also strategies to develop an efficient and practical SACs in energy conversion systems.

N doped porous carbon nanosheets with enhanced zinc ion storage capability

Aqueous zinc ion hybrid capacitors are promising energy storage devices due to their high security, excellent environmentally friendly, big power density and zero carbon emissions. Herein, an aqueous zinc ion hybrid capacitor is designed using an N doped porous carbon nanosheet cathode, which prepares by in-situ self-activated and self-doped strategy from ethylenediamine tetraacetic acid tripotassium salt. The superior ions storage performance is owing to the electric dual layer capacitor deriving from ion adsorption/desorption, Zn2+ deposition/stripping and extra pseudo-capacitance of vibration in valence of nitrogen functionalities. Additionally, the results of theoretical calculation show that the adsorption energy between N-5, N-6 and zinc ions is −4.816 and −3.453 eV, respectively, and higher than those of other N groups. Consequently, the N doped porous carbon nanosheet cathode displays big discharge capacity of 204.7 mAh g−1 and high energy density of 143 Wh kg−1. Moreover, the Zn‖N doped porous carbon nanosheet zinc ion hybrid capacitor presents superior cycle stability with 95.5% of initial capacity after 20,000 cycles. This study opens up a universal method by incorporating reversible redox reactions through N functionalities to enhance the zinc ions storage properties of zinc ion hybrid capacitor.