JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Dexin Xu,Jing Yao,Xinzhi Ma,Yan Xiao,Chi Zhang,Wei Lin,Hong Gao
Electrochemical water splitting, the most direct and clean method used for the production of hydrogen, requires highly efficient bifunctional electrocatalysts that can accelerate hydrogen evolution reactions (HER) and oxygen evolution reactions (OER) by overcoming their kinetics barriers. Herein, self-supported F, N codoping CoP nanosheets (denoted as FN-CoP NS) are prepared as efficient and stable bifunctional electrocatalysts. Codoping of F and N neutralizes the electronegativity of surface P-O by cleaving the Co-P-O of non-metallic P sites on the surface (O derived from the surface oxidation). This contributes to an increased Co 2+ content with considerable adjustable electronegativity and also optimizes HER and OER processes. As a result, FN-CoP NS requires 66 and 241 mV overpotentials to deliver the current density of 10 mA cm −2 during HER and OER, respectively. A full water electrolyzer equipped FN-CoP NS as both cathode and anode only require 1.57 V to drive the current density of 10 mA cm −2 and to sustain 50 mA cm −2 for 48 h. This work adjusts the electronic structure of metal phosphides by a double anion codoping strategy, which provides a reference value for the rational design of efficient bifunctional electrocatalysts.
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JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2022
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IF 5.062
Yameng Zhu,Mengmeng Zhang,Shujie Wei,Boyao Wang,Jun He,Xilong Qiu
Hollow mesoporous silica nanoparticles (HMSN) have been widely studied as drug delivery carriers due to their high drug loading capacity in the internal cavity. In this study, monodisperse and temperature-responsive hollow mesoporous silica nanoparticles ( [email protected] (NIPAM- co -NHMA)) were synthesized and investigated. HMSN and [email protected] (NIPAM- co -NHMA) were characterized by SEM, TEM , FT-IR, TGA, XRD and nitrogen adsorption-desorption isotherms. The results showed that the cross-linked temperature-sensitive polymer P(NIPAM- co -NHMA) was grafted onto the surface of HMSN. Subsequently, using puerarin (PUE) as the drug model, the results demonstrated that the [email protected] (NIPAM- co -NHMA) had an excellent loading efficiency and exhibited excellently temperature-sensitive release behavior. Furthermore, the biocompatibility and stability of HMSN and [email protected] (NIPAM- co -NHMA) were studied by MTT assay and hemolysis assay, the results indicated [email protected] (NIPAM- co -NHMA) possessed excellent biocompatibility and stability. Thus, we have successfully synthesized [email protected] (NIPAM- co -NHMA), and the drug release is temperature-responsive, which can realize controlled drug release .
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NEW JOURNAL OF CHEMISTRY
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2022
·Vol. 46
·期 14
·6461-6469
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IF 3.925
Li'an Peng,Yongxiao Tuo,Yan Lin,Cuiping Jia,Shutao Wang,Yan Zhou,Jun Zhang
Nickel sulfide (NiS) has sparked considerable interest as a promising electrode material for supercapacitors. However, the poor electrical conductivity and unstable structure during the continuous charge–discharge process have limited its practical applications to a great extent. Herein, we report a two-step solvent-thermal method to synthesize phosphorus-doped NiS nanocrystals (P-NiS). The bulk doping of P not only enhances the electrical conductivity and increases the number of electrochemical active sites, but also strengthens the structural stability of the NiS nanomaterial. As a result, the synthesized P-NiS demonstrated an impressive electrochemical performance with a high specific capacity (727.79 C g−1), superior rate performance (50.60% capacity retention at 50 A g−1), and excellent cycling stability (93.10% capacity retention after 3000 cycles). Furthermore, a hybrid supercapacitor (HSC) of P-NiS//AC was assembled in a 2 M KOH electrolyte. It delivered a maximum energy density of 39.80 W h g−1 at the power density of 809.50 W kg−1 and cycling stability with 89.70% capacity retention after 6000 cycles at 1.6 V. This study provided an effective strategy to achieve the bulk doping of heteroatoms into the transition metal sulfides for improving the intrinsic properties of electrodes in electrochemical energy-storage devices.
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ACS Applied Materials & Interfaces
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2022
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IF 10.383
Xiangbao Yuan,Haiyun Li,Jing Fan,Lin Zhang,Feng Ran,Menglei Feng,Peiyuan Li,Weixiang Kong,Shijian Chen,Zhigang Zang,Shuangpeng Wang
The effect of substitutional metal dopants in NiOx on the structural and electronic structures is of great interest, particularly for increasing the p-type conductivities as a hole transport layer (HTL) applied in perovskite solar cells (PSCs). In this paper, experimental fabrications and density functional theory calculations have been carried out on Cd-doped NiOx films to examine the effect of divalent doping on the electronic and geometric structures of NiOx. The results indicate that divalent Cd dopants reduced the formation energy of the Ni vacancy (VNi) and created more VNi in the films, which enhanced the p-type conductivity of the NiOx films. In addition, Cd doping also deepened the valence band edge, reduced the monomolecular Shockley–Read–Hall (SRH) recombination losses, and promoted hole extraction and transport. Hence, the PSCs with Cd:NiOx HTLs manifest a high efficiency of 20.47%, a high photocurrent density of 23.00 mA cm–2, and a high fill factor of 79.62%, as well as negligible hysteresis and excellent stability. This work illustrates that divalent elements such as Cd, Zn, Co, etc. may be potential dopants to improve the p-type conductivity of the NiOx films for applications in highly efficient and stabilized PSCs.
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CURRENT APPLIED PHYSICS
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2022
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IF 2.856
Xiaoxue Lian,Yan Li,Yunling Zou,Dongmin An,Qiong Wang,Qingjun Zhou,Xueqi Li
The g-C 3 N 4 nanosheets were synthesized by a multistage program calcination with different heating rate, which was an easy, low-cost, and quick method. The morphology and structure of samples were characterized by various techniques. The performance evaluation of the samples was tested by degrading Rhodamine B, Methylene Blue, Tetracycline Hydrochloride and P-Nitrophenol in visible light . The results show that the photodegradation properties of TP-g-C 3 N 4 prepared by multistage program calcination are the best than others. In particular, the degradation rate of TP-g-C 3 N 4 to Rhodamine B reached 99.6% in just 4 min. TP-g-C 3 N 4 catalyst has excellent stability and recycling performance. According to free radical capture experiments, •O 2 − may be the main active species for pollutant degradation. The possible photocatalytic degradation mechanism was also discussed. Due to the high specific surface area and a narrow band gap, the TP-g-C 3 N 4 becomes a promising photocatalyst.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Chuankun Yin,Aimal Khan,Qiaohui Gao,Quan Li,Xiaoyun Zhou,Xiuying Liu,Aihua Xu,Xiaoxia Li
Recently, the development of efficient mixed metal oxide catalysts for organic pollutants degradation via peroxymonosulfate (PMS) activation is a hot topic in the area of wastewater treatment . In this work, the silver-copper mixed-oxide, Ag 2 Cu 2 O 3 (ACO) was reported for the first time as a highly active catalyst for removing organic pollutants in the presence of PMS. ACO was successfully synthesized from Ag + and Cu 2+ ions at 60 °C, and its structure was strongly influenced by the temperature. The catalyst could almost completely remove p -nitrophenol and other pollutants with 0.65 mM PMS after 20 min, and also exhibited satisfactory stability and recyclability. The system efficiency was shown to vary with the concentration of PMS and catalyst, as well as solution pH. Scavenger experiment and EPR analysis indicated that radicals produced by the oxidation of Ag(I) and Cu(I) with PMS could promote degradation reaction. The synergistic effect between Cu and Ag in the bimetallic catalyst was demonstrated to contribute to the high performance: Cu(II)-O-Ag(I) bonds promote the conversion of Cu(II) species to Cu(I) through reaction with PMS, and facilitate the oxidation of Cu(I) and Ag(I) by PMS to generate active radicals. The study provides a feasible strategy to design efficient and stable bimetal oxide catalysts for PMS activation.
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CATALYSIS TODAY
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2022
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IF 6.562
Kuan Wang,Song-Song Li,Junlei Wang,Zhen-Hong He,Dan Wang,Rong-Rong Zhang,Weitao Wang,Yang Yang,Zhao-Tie Liu
Photothermal oxidation of cyclohexane with molecular oxygen in solvent-free is considered to be an efficient approach for the formation of cyclohexanone and cyclohexanol (KA oil), and possesses the potential to generate the next stage product of adipic acid (AA) by one-pot oxidation in chemical industry. Herein, a unique type of Co 8 La 1 O x /WO 3 Z-scheme nanocomposites with p-n heterojunction was successfully constructed by a facile process of solvothermal reaction in conjunction with the simple impregnation method. The Co 8 La 1 O x /WO 3 Z-scheme heterojunction nanocomposites achieved an excellent catalytic performance for the photothermal oxidation of cyclohexane at 120 ℃ under visible light in solvent-free conditions. Surprisingly, 10.35% conversion of cyclohexane with 98.75% selectivity of KA oil (liquid, 80.97%) and AA (solid, 17.78%) was achieved during the reaction time of 3 h. Moreover, the desirable durability and stability of the Co 8 La 1 O x /WO 3 composites demonstrated a potential application as an industrial catalyst. The outstanding catalytic performance of the Co 8 La 1 O x /WO 3 composites could be ascribed to the enhanced electron excitation capacity, the accelerated electron-hole separation and migration, the inhibited charge recombination, the strong visible-light absorption, and the efficient synergetic catalytic effect of photo-thermo. Besides, high oxygen adsorption capacity and large specific surface area of the Co 8 La 1 O x /WO 3 composites can efficiently build a bridge between cyclohexane and O 2 to fully utilize the oxygen participation in the oxidation. The present approach provides a promising perspective for the designing and constructing of Z-scheme heterojunction catalyst with a high-efficiency photo-thermo catalytic performance in the oxidation of cyclohexane to KA oil and AA in chemical industry.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Xiaofang Yuan,Jianfei Xiao,Murat Yılmaz,Tian C. Zhang,Shaojun Yuan
Modification of biomass-derived porous biochar by heteroatomic doping can significantly improve CO 2 adsorption and capacitance performance of supercapacitors. In this study, a novel N, P co-doped porous biochar was developed by facile two-step pyrolysis using widely available and low-cost cornstalks as the carbon source, melamine as the N source, phytic acid as the P source, and a mild K 2 CO 3 as an activating agent. The pore structures and surface chemical characteristics of the as-prepared N, P co-doped cornstalk-derived porous biochar (abbreviated as NPCPB) were regulated by adjusting the pyrolysis temperature and K 2 CO 3 ratio. The as-prepared NPCPB-600-3 (600 represents an activation temperature of 600 °C, and 3 represents the mass ratio of K 2 CO 3 to the carbon composite precursor is 3) was characterized by various methods, and its CO 2 adsorption and electrochemical properties were studied. Results indicated that narrow micropores and N, P doping together determined the adsorption capacity, which was 3.11 mmol g −1 for CO 2 at 1 bar and 25 °C, with almost no decay after 10 consecutive cycles. NPCPB-600-2 had a superior specific capacity of 203.5 F g −1 at a current density of 1 A g −1 and an outstanding cycling stability with a good capacity retention of 106% after 5000 cycles at a high current density of 10 A g −1 . This work reveals that heteroatomically doped porous biochar from biomass has a promising application in CO 2 capture and supercapacitors.
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APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Shuo Li,Nan Yao,Lulu Fan,Zhengjia Li,Linyan Yang,Jie Cen,Xiaonian Li
How to break the activity-selectivity dependence in halonitrobenzene hydrogenation remains a challenge. In this work, Ni@C N/SiO 2 were synthesized and examined in the hydrogenation of p -chloronitrobenzene. It showed that the electron transferred from nitrogen doped carbon shell to Ni 0 core (core–shell synergistic effect) dominated the intrinsic activities of Ni@C N/SiO 2 with dual-reaction surfaces (H 2 dissociated on Ni 0 core, while p -chloronitrobenzene was hydrogenated on carbon shell) in the thiophene-free hydrogenation, leading to their higher turnover frequencies than Raney Ni catalyst. During the thiophene-involved hydrogenation, the adsorption of thiophene on Ni 0 changed its electron density and blocked the active sites. These enhanced the selectivity, but significantly reduced the activity for Raney Ni catalyst. Comparatively, the carbon shell protected Ni 0 core from thiophene adsorption so that the hydrogen dissociated on Ni 0 as usual. However, the adsorption of thiophene on the carbon shell reduced the available sites for p -chloronitrobenzene adsorption. Although Ni@C N/SiO 2 had lower activities in the thiophene-involved reactions than those of thiophene-free reactions, they achieved ∼100 % p-chloroaniline selectivities and 8-fold higher turnover frequencies than Raney Ni, breaking the activity-selectivity dependence. This reveals that the available sites on the carbon shell and the core–shell synergistic effect determine the thiophene-involved hydrogenation activities of Ni@C N/SiO 2 catalysts.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Cheng Wang,Siqi Huo,Guofeng Ye,Pingan Song,Hao Wang,Zhitian Liu
Epoxy resin (EP) features superior comprehensive performances, but inherent flammability seriously limits its industrial applications. Current flame-retardant strategies often bring about enhanced flame retardancy but deteriorated mechanical, thermal and optical properties and neglect flame retardant durability. Herein, a phosphorus/silicon-containing polyethylenimine (PES) is designed as a multifunctional curing agent for EP. Replacing polyethylenimine (PEI) with PES maintains high visible light transmittance of EPs and improves the UV-blocking properties. The EP cured by 30 wt% PES (EP/30PES) exhibits enhanced mechanical properties compared with the EP cured by 15 wt% PEI (EP/15PEI). EP/30PES achieves a limiting oxygen index (LOI) of 35.0% and a UL-94 V-0 rating, and its peak smoke release rate (PSPR) reduces by 63.8% relative to that of EP/15PEI. Hence, the great flame retardancy, smoke suppression and mechanical performances of EP/30PES enable it to outperform previous flame-retardant EP/aliphatic amine counterparts. Meanwhile, EP/30PES shows durable flame retardancy, which still achieves a UL-94 V-0 classification after acid/alkali/aging resistance tests. This work provides an advanced design of multifunctional curing agents to create durable fire-safe EPs with great UV-shielding and mechanical performances.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Zhao Du,Huayi Cai,Zhonglu Guo,Zhiyuan Zhao,Jing Lin,Yang Huang,Chengchun Tang,Guifeng Chen,Yi Fang
Herein, a series of novel Ti 3 C 2 T x /p-BN heterojunctions with excellent photocatalytic activity have been prepared by combining one-dimensional (1D) porous BN fibers (p-BN) with high aspect ratio and two-dimensional (2D) ultrathin Ti 3 C 2 T x MXenes for photocatalytic conversion of CO 2 -to-CO. Our results show that the optimized photocatalyst can photo-reduce CO 2 to generate CO under UV light with CO yield of 22.53 μmol g −1 h −1 , which is 4.3 and 20.1 times of p-BN (5.23 μmol g −1 h −1 ) and Ti 3 C 2 T x (1.23 μmol g −1 h −1 ), respectively. We demonstrate that the Ti 3 C 2 T x /p-BN heterojunction can combine the efficient CO 2 adsorption of porous p-BN and excellent electronic conductivity of Ti 3 C 2 T x . Moreover, the interfacial Ti-O-B bonds lead to strong interaction between p-BN and Ti 3 C 2 T x , resulting in the formation of Schottky heterojunction. The synergistic effect not only enables the adsorption of CO 2 by Ti 3 C 2 T x /p-BN heterojunction higher than p-BN, but also accelerates the transfer and separation of photogenerated carriers in p-BN, which finally exhibits promoted CO 2 photocatalytic activity. The present work pioneer the application of Ti 3 C 2 T x /p-BN heterojunction in photocatalytic CO 2 reduction and further guides the design of noble-metal-free photocatalysts.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
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IF 6.371
Xueping Sun,Peng Wei,Zhimin He,Fangyuan Cheng,Lin Tang,Qing Li,Jiantao Han,Jianhua He
Developing highly efficient and stable bifunctional electrocatalysts plays a crucial role in water splitting reaction. Benefiting from their abundant reserves, superior conductivity and excellent intrinsic catalytic properties, transition metal phosphides (TMPs) draw wide attentions in recent years. However, most of TMPs synthesis processes are still acomplicated and dangerous as the common use of toxic and flammable phosphorus sources. Herein, we propose a universal and scalable synthetic strategy to prepare a series of nanosized transition metal phosphide encapsulated in nitrogen-phosphorus co-doped carbon (TMP@NPC) catalysts by using green and inexpensive adenosine triphosphate (ATP) as a new phosphorus source. Profiting from the in situ and confined synthetic strategy, as-prepared TMP@NPC catalysts not only show nanosized dimension, but also endow extremely intimate interaction with N, P component derived from ATP. All as-prepared TMP@NPC catalysts exhibit excellent hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) activities with small overpotentials and robust capabilities. Especially, the CoP@NPC displays the lowest overpotentials of 184.35 mV and 303 mV at 10 mA cm −2 toward HER and OER in alkaline electrolyte , respectively, which also exhibits outstanding stability (over 50 h at 10 mA cm −2 ) in both reactions. As a proof of further application, as-prepared CoP@NPC acting as both cathode and anode shows excellent performance in overall water splitting. This work not only highlights the green and general synthesis strategy importance in designing and constructing TMPs, but also reinforces the understanding of intimate interaction in coupled hybrid electrocatalysts.
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