RENEWABLE ENERGY
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2025
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IF 9.1
Bo Zhao,Haiping Zhou,Yining Wang,Chengdie Hu,Yunpeng Wu,Qingqing Pan,Jiawei Wang
Efficient splitting of H 2 O necessitates the utilization of highly active and stable electrocatalysts. In this study, a nickel−based composite electrocatalyst, specifically a graphene−loaded nickel butanedione oxime composite denoted as Ni(DMG) 2 @G, was successfully synthesized via a mechanochemical strategy, and aimed to investigate its performance in H 2 O splitting. When operated in an alkaline medium (1 M KOH), the low−crystallinity Ni(DMG) 2 @G catalyst exhibited novel electrocatalytic properties for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) during H 2 O splitting. Notably, the overpotentials for HER and OER were merely 76 mV and 234 mV, respectively, at a current density of 10 mA cm −2 . Most significantly, the catalyst also demonstrated commendable catalytic performance in the overall H 2 O splitting process, rendering Ni(DMG) 2 @G an effective bifunctional catalyst. The exceptional catalytic performance of Ni(DMG) 2 @G can be primarily attributed to two factors. Firstly, the mechanochemical synthesis strategy resulted in the formation of low−crystallinity and small−sized Ni(DMG) 2 particles, which exposed a substantial number of active sites while simultaneously increasing the specific surface area. Secondly, theoretical calculations indicated that the combination of Ni(DMG) 2 and graphene significantly enhanced the electrical conductivity and accelerated the electron transfer process. This study offers a novel synthesis strategy for the preparation of high−quality electrocatalysts and contributes to the advancement of H 2 O electrolysis technology.
研究领域:
电化学
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催化
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材料科学
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纳米技术
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能量转换
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DOI
高影响因子
Particuology
·
2025
·
IF 4.3
Yayuan Zheng,Hao Lv,Xinka He,You Zhou,Cheng Gou,Huaiming Du,Ping Zhu
The application of sodium dihydrogen phosphate (NaH 2 PO 4 ) in drinking water and food processing underscores the importance of its crystallization process, which significantly affects product quality and yield. In this study, the dynamic laser method was used to explore the solubility and super-solubility of NaH 2 PO 4 in H 2 O-ethylene glycol (EG) binary systems of different proportions. We first applied the Apelblat, Van't Hoff, and NIBS-RK models to correlate solubility data and identified the best-fitting model. Then, the Mersmann and Barata models were used to determine the solid-liquid surface tension and crystal surface entropy factor. The Van't Hoff model calculated the molar enthalpy, entropy of dissolution, and Gibbs free energy. Experimental results showed that dissolution is endothermic and spontaneous, mainly driven by enthalpy changes, while crystallization is exothermic, providing key data for kinetics research. In the kinetics analysis, NaH 2 PO 4 crystallization was found to be linearly correlated growth, with the logarithm of crystal particle number density positively related to particle size. Comparing the CR and ASL models, the ASL model better reflects the growth rate. The derived nucleation and growth kinetics models indicated that growth and nucleation rates are positively correlated with temperature and supersaturation ratio. During cooling crystallization, the supersaturation ratio has a greater impact on the growth rate than the nucleation rate and a more significant effect on nucleation than suspension density and stirring rate. This research offers valuable guidance for high-quality NaH 2 PO 4 industrial production.
研究领域:
化学工程
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食品科学
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DOI
高影响因子
Journal of Materials Chemistry C
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2017
·Vol. 5
·期 37
·9588-9596
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IF 5.256
T. T. Deng,E. H. Song,Y. Y. Zhou,L. Y. Wang,S. Ye,Q. Y. Zhang
A novel hydrous fluoride K2GaF5(H2O) with a special [GaF5(H2O)] group has been discovered. Interestingly, further rapidly adding K2MnF6 into the co-precipitation reaction system of K2GaF5(H2O) results in stable anhydrous cryolite phosphor K3GaF6:Mn4+. The investigation of a possible formation mechanism unravels that hydrous K2GaF5(H2O) can act as an intermediate to transform into anhydrous K3GaF6:Mn4+ induced by K2MnF6. Detailed characterizations, such as phase identification, morphology, elemental composition analysis, and IR spectra, record the time-dependent evolution process. Upon blue light excitation, phosphor K3GaF6:Mn4+ shows sharp line red emission at ∼626 nm. It presents good moisture tolerance (50% of initial luminous efficacy at 48 h), which might, due to the absence of coordinated water molecules, make the host matrix less hydrophilic. This performance, much better than those of Na3GaF6:Mn4+, K3AlF6:Mn4+, and Rb2GeF6:Mn4+, illustrates that K3GaF6 is a suitable host for Mn4+ doping. Besides, a good recovery in luminescence properties during thermal cycling (298–473 K) further demonstrates the high stability of anhydrous K3GaF6:Mn4+. By incorporating K3GaF6:Mn4+ as a red light component, a fabricated warm white light-emitting diode (WLED) presents low correlated color temperature (CCT = 3691 K), high color rendering index (Ra = 87.2 and R9 = 50.2), and a luminous efficacy of 92.1 lm W−1, and further exhibits good resistance in photoelectric properties to thermal impact with temperature ranging from 293 to 353 K, showing potential in warm WLED applications. Herein, the inductive transition from hydrous K2GaF5(H2O) to moisture-proof K3GaF6:Mn4+ is helpful for the investigation of the moisture resistance of Mn4+ activated fluorides. Moreover, these results probably propose a feasible strategy to exploit stable Mn4+-activated fluoride phosphors for warm WLED applications.
研究领域:
材料科学
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光电子学
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无机化学
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固态照明
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荧光粉化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Runze Guo,Jianyun Wu,Wenbin Wang,Zhiyu Qin,Jingshan Hou,Jiahua Wang,Xiangshuai Kong,Mingbo Wu,Wenting Wu
Methane (CH 4 ) and carbon dioxide (CO 2 ) are the most prominent greenhouse gases. Their simultaneous photocatalytic conversion presents an effective strategy for advancing sustainable chemical transformations. In this study, a nanocomposite photocatalyst composed of Keggin-type phosphomolybdate (CsNiPMO) and TiO 2 nanosheets was synthesized to enable the co-conversion of CH 4 and CO 2 at room temperature. Specifically, CH 4 was oxidized to form formaldehyde (HCHO), while CO 2 was reduced to CH 4 . The formaldehyde yield reached 4284 μmol·g −1 ·h −1 , with a selectivity of 98.3 %. Mechanistic investigations revealed that water serves as a crucial intermediate medium. Hydroxyl radicals (·OH), generated via water oxidation, were identified as the primary active oxygen species responsible for CH 4 oxidation. Additionally, the hydrogen ions (H + ) generated during water oxidation served as the hydrogen source for the CO 2 reduction. The introduction of CsNiPMO has facilitated the efficient charge separation within TiO 2 , enabling spatially separated redox reactions: CO 2 reduction occurred predominantly on CsNiPMO, while CH 4 oxidation was confined to TiO 2 nanosheets. This work demonstrates a highly efficient photocatalytic system for selective CH 4 oxidation and CO 2 reduction under mild conditions, providing a novel and sustainable approach for the high-selectivity conversion of methane.
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Science Advances
·
2023
·Vol. 9
·期 24
·
IF 13.6
Mingrui Wang,Peng Wang,Guanghui Zhang,Zening Cheng,Mengmeng Zhang,Yulong Liu,Rongtan Li,Jie Zhu,Jianyang Wang,Kai Bian,Yi Liu,Fanshu Ding,Thomas P. Senftle,Xiaowa Nie,Qiang Fu,Chunshan Song,Xinwen Guo
The decomposition of cobalt carbide (Co 2 C) to metallic cobalt in CO 2 hydrogenation results in a notable drop in the selectivity of valued C 2+ products, and the stabilization of Co 2 C remains a grand challenge. Here, we report an in situ synthesized K-Co 2 C catalyst, and the selectivity of C 2+ hydrocarbons in CO 2 hydrogenation achieves 67.3% at 300°C, 3.0 MPa. Experimental and theoretical results elucidate that CoO transforms to Co 2 C in the reaction, while the stabilization of Co 2 C is dependent on the reaction atmosphere and the K promoter. During the carburization, the K promoter and H 2 O jointly assist in the formation of surface C * species via the carboxylate intermediate, while the adsorption of C * on CoO is enhanced by the K promoter. The lifetime of the K-Co 2 C is further prolonged from 35 hours to over 200 hours by co-feeding H 2 O. This work provides a fundamental understanding toward the role of H 2 O in Co 2 C chemistry, as well as the potential of extending its application in other reactions.
研究领域:
催化化学
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化学工程
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材料科学
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可持续能源
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多相催化
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DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 22
·2400681
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IF 8
Xiu-Xian Guo,Jing-Hua Chen,Jian-Bin Luo,Jun-Hua Wei,Zhi-Zhong Zhang,Zi-Lin He,Qing-Peng Peng,Dai-Bin Kuang
Stimuli-responsive luminescent materials have attracted much research attention due to their wide application potential in various fields. Typically, the family of hydrated double perovskite A 2 M III X 5 ·H 2 O shows unique emission color transformation between hydrated and dehydrated complexes, highlighting the application potential in advanced anti-counterfeiting. Herein, two zero-dimensional perovskites of Cs 2 YbCl 5 ·H 2 O and Cs 3 YbCl 6 , are reported and broad-band self-trapped exciton recombination emission can be realized via external Sb 3+ doping. Intriguingly, the Cs 2 YbCl 5 ·H 2 O can be transformed to the dehydrated counterpart of Cs 3 YbCl 6 through a facile methanol treatment at room temperature, leading to the emission color transformation from yellow to green. Notably, the green-emissive Cs 3 YbCl 6 :Sb 3+ delivers a high photoluminescence quantum yield of 67.3%. Leveraging the advantages of obvious methanol-induced emission color transformation between Cs 2 YbCl 5 ·H 2 O and Cs 3 YbCl 6 at room temperature, Cs 2 YbCl 5 ·H 2 O can be used in the field of high-security-level anti-counterfeiting.
研究领域:
材料科学
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光电功能材料
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发光材料
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防伪技术
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钙钛矿化学
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DOI
高影响因子
ACS Omega
·
2023
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IF 4.1
Ning Shi,Tianlang Zhu,Hongyan Zhang,Hongsheng Huang,Liang Zhou,Ying Liu,Riyang Shu
Catalytic conversion of cellulose into the novel platform molecule 2,5-hexanedione (HXD) is regarded as one feasible approach for high-value utilization of biomass resources. Here, we reported one efficient way of one-pot conversion of cellulose into HXD with high yield of 80.3% in H2O and tetrahydrofuran (THF) mixture within Al2(SO4)3 combined with Pd/C as a catalyst. In the catalytic reaction system, Al2(SO4)3 could catalyze the conversion of cellulose into 5-hydroxymethylfurfural (HMF), and Pd/C combined with Al2(SO4)3 could catalyze the hydrogenolysis of HMF into furanic intermediates such as 5-methylfurfuryl alcohol and 2,5-dimethylfuran (DMF) without causing over-hydrogenation of these furanic intermediates. These furanic intermediates were finally transformed into HXD catalyzed by Al2(SO4)3. Besides, the H2O/THF ratio could significantly influence the reactivity of the hydrolytic furanic ring-opening of the furanic intermediates. The catalytic system also showed excellent performance on the conversion of other carbohydrates (glucose and sucrose) into HXD.
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DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Dongfang Zhao,Shoulong Dong,Liju Bai,Dongyang Li,Helei Liu
The concentration profiles of all chemicals obtained in the Amine-CO 2 -H 2 O system based on the Vapor-liquid equilibrium (VLE) plots are essential for the analysis and understanding of the kinetics. This work aims at obtaining accurate and reliable VLE plots of 3DMA1P via both experimental and mathematical methods. VLE plots are essential for understanding the reaction process and mechanism of carbon dioxide absorption into amine solutions. The experiments were conducted over a concentration range of 1 ∼ 2 mol/L, temperature of 298 K, and CO 2 partial pressure of 15 kPa. Regarding the experimental method, 13 C NMR detection was performed to generate concentrations of Amine and AmineH + based on the protonation calibration equation. The results showed that the 13 C NMR method had little difference between the results of mass conservation calculation and charge conservation calculation under different CO 2 loading. Among the mathematical methods, the results obtained by the pH method involving charge conservation were quite different from those calculated by mass conservation, while the D-M model method strictly following the theoretical system satisfied both the mass and charge conservation. The distribution curves of the concentration of each species obtained by the three methods were compared. It was found that 13 C NMR and D-M model method could secure closer and more accurate results than the pH method. In conclusion, both the 13 C NMR method and the D-M model method plots are useful for obtaining accurate and reliable VLE plots for the 3DMA1P-CO 2 -H 2 O system, as well as for other monoamine and mixed amine systems.
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高影响因子
ANALYTICAL CHEMISTRY
·
2022
·
IF 8.008
Zhengang Han,Juxia Wang,Peiyao Du,Jing Chen,Shuhui Huo,Huixia Guo,Xiaoquan Lu
Owing to their almost similarities in size, shape, and chemical reactivity, effectively distinguishing deuteroxide (D2O) in water (H2O) remains an ongoing challenge, and the examples of a D2O probe are still quite scarce. Herein, since H2O can decrease the lifetime of a singlet oxygen as a vital intermediate and an H/D exchange in the luminescence process of porphyrins, we systematically investigated the enhanced ultraviolet–visible (UV–vis), photoluminescence (PL), and electrochemiluminescence (ECL) of water-soluble tetrakis(carboxphenyl)porphyrin (TCPP) in D2O. The findings showed that these luminescent properties had been greatly enhanced with the increase of the D2O fraction in water. Consequently, we first developed the highly facile methods of detecting D2O in H2O by the UV–vis, PL, and ECL of TCPP, respectively. Impressively, the ECL analysis exhibited a great superiority with a lower detection limit of 0.29 nM. The work not only achieves the challenging task of distinguishing between H2O and D2O but also provides a unique strategy to enhance the luminescent performance of porphyrin.
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DOI
PubMed
高影响因子
ACS ES&T Engineering
·
2023
·
IF 7.1
Peng Chen,Yun Wang,Jiazhen Liao,Yi Liang,Qingqing Ye,Yi Wang,Zhongwei Jiang,Chunhui Shan,Wendong Zhang,Fan Dong
The dissociation of H2O molecules plays an important role in producing protons for promoting hydrogenation reduction of CO2. Therefore, developing excellent photocatalysts to promote the dissociation of H2O molecules and reveal the effect mechanism is the key research direction to enhance CO2 reduction efficiency. In this work, we synthesized BiSbO4 with oxygen vacancies (OVs) to investigate the photocatalytic mechanism of CO2 conversion and H2O dissociation. Experimental results indicate that the introduction of OVs into BiSbO4 can enhance the absorption capacity of light, narrowing band gaps and impeding the recombination of photogenerated carriers. Importantly, the existence of OVs in BiSbO4 can promote the adsorption and activation of H2O molecules via the stronger covalent interaction, which facilitates the dissociation of H2O molecules to generate more protons and lowers the energy barriers of •COOH to improve the efficiency of CO2 reduction. This study reinforces our understanding of the principle of photocatalytic CO2 reduction and the important role of H2O dissociation in photocatalytic CO2 conversion.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Yamei Huang,Peiyao Du,Wen-Xiong Shi,Ye Wang,Shuang Yao,Zhi-Ming Zhang,Tong-Bu Lu,Xiaoquan Lu
Solar-driven CO 2 reduction with H 2 O oxidation into liquid fuels is highly desirable for sustainable carbon cycle to achieve carbon neutral, but represents a great challenge for artificial photosynthesis. Herein, bimetallic PdIn nanoclusters are confined in a photosensitizing covalent organic framework (N 3 -COF) to facilely construct Pd x In y @N 3 -COF composites (x:y = 1:0, 0:1, 1:2, 1:1, 2:1). The resulting PdIn@N 3 -COF exhibits excellent activity for CO 2 photoreduction with H 2 O oxidation as the H + and e − source, showing a record-high total yield of 798 μmol g -1 for producing CH 3 OH (74 %) and CH 3 CH 2 OH (26 %) among the framework materials. The synergy in both the bimetallic nanocluster and cluster@N 3 -COF contributes greatly to C C coupling and interfacial charge transfer, thus achieving excellent activity for conversion of CO 2 to C 1 /C 2 alcohols on the non-copper catalysts. This work highlights the amazing potential for constructing bimetallic nanocluster@photosensitizing supports to produce alcohols in artificial photosynthesis with H 2 O oxidation.
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JOURNAL OF COORDINATION CHEMISTRY
·
2021
·
IF 1.751
Guo Lina,Yuanyuan Gao,Limin Han
A tridentate Schiff base probe L (2-NC5H4)C(H)=N(C6H4OH-2) was synthesized via a facile reaction. Probe L showed weak fluorescence emission that originated from intermolecular proton transfer in solution. With addition of Cu2+, the emission of L was quenched by the paramagnetic nature of Cu2+. However, after the solution of L and Cu2+ was refluxed, the emission presented a completely opposite result changing from fluorescent quenching to fluorescent enhancement. The fluorescent enhancement was attributed to a planar cis-structure of Cu2+ complex. Hence, a strategy for change of emission behavior of fluorescent probe L to Cu2+ was developed; a “turn on” mode of detection Cu2+ was realized in methanol solution. A simple refluxing made probe L work as a light-up fluorescent sensor for Cu2+ in methanol solution and gave improvement of sensitivity and selectivity in detection of Cu2+. When H2O was added into the solution of the Cu2+ complex, fluorescent enhancement increased and it can be used to detect water content in methanol.
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