CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yan Liu,Ling Zhang,Kaiyang Guo,Jingyuan Zhao,Yonglei Xing,Zhuosen Wang,Yapeng Tian,Xinwei Cui
Intercalation pseudocapacitance is the key point to achieving the balance between the volumetric capacitance and the rate performance of energy storage. However, the low pseudocapacitive reactivity of the active center still limits the energy density of the pseudocapacitance devices. Herein, we propose a strategy that regulates the p - d hybridization of confined MXene via the co-doping of B and O atoms (BO-MXene) for outstanding electrochemical performance. Both experiments and density functional theory (DFT) reveal that the inner doped O atoms in low 2 p orbital energy strengthen the hybridization of Ti and electron-deficient B in MXene for high retention of B atoms, weaken the Ti-O covalency in MXene. As a result, the weakened p - d hybridization of Ti and O for the outer surface and strengthened p - d hybridization of Ti and B for the inner, promote the adsorption of protons and electron transfer, respectively. Further, the BO-MXene-based hybrid supercapacitors achieve a significant volumetric energy density of 56.86 Wh L -1 at 25.6 kW L -1 . This electronic structure via tuning the p - d hybridization in MXene proposes a new path for designing proton-confined intercalation pseudocapacitance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
TETRAHEDRON
·
2017
·
IF 2.651
Shi-Yuan Liu,Lin-Yan Xu,Chun-Yu Liu,Zhi-Gang Ren,David James Young,Jian-Ping Lang
An efficient catalytic system containing [RuCl 2 (η 6 -p-cymene)] 2 and one P,N ligand, N-diphenylphosphino-2-aminopyridine ( L1 ) was loaded in catalyzing the alkylation of ketones with primary alcohols for a diverse array of substrates. Other five P,N ligands based on pyridin-2-amine and pyrimidin-2-amine were also examined in this reaction to explore the influence of steric hindrance and electronic effects. Monitoring by 1 H NMR and ESI-MS reveals a stable cationic L1 -coordinated ruthenium hydride intermediate, identified as [Ru(η 6 -p-cymene)(κ 2 - L1 )H] + . Organic intermediates consistent with a three-step dehydrogenation , alkylation and hydrogenation pathway were also observed. The final step in this reaction, the ruthenium-catalysed transfer hydrogenation reduction of α,β-unsaturated ketone with benzyl alcohol was performed separately.
研究领域:
有机化学
·
催化化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOILS AND SEDIMENTS
·
2021
·Vol. 21
·期 6
·2287-2300
·
IF 3.308
Kang Longfei,Zhang Guoqiao,Chu Guixin
Purpose Phosphorus (P) fertilization methods significantly affect soil P availability, transformation, and crops yield. However, contradictory or paradoxical results are often available, and debates about this issue have never ceased so far. Therefore, the aims of this study are to explore influences of different P application methods on availability and transformation of added P in drip-irrigated system, and the responses of maize P uptake and its agronomic performances to P fertigation are also investigated. Materials and methods Here, we conducted a pot and filed experiments in drip-irrigated calcareous soil. Treatments included different P sources (phosphoric acid; polyphosphoric acid) with basal and split repeated application manners. Results and discussion Compared to the basal application, the average values of C DGT -P (P concentrations tested via diffusive gradient in thin films technique), Olsen-P, water-soluble P, and in situ P in the split repeated P application increased by 23.7%, 10.2%, 16.5%, and 34.4%, respectively (pot experiment). Furthermore, the average values of labile P (resin P and NaHCO 3 -P) and moderately labile P (NaOH-P) with the repeated P addition increased by 19.7% and 12.6%, whereas the concentrations of non-labile P lowered by 19.3%, respectively, relative to basal application treatment (pot experiment). The same trend was obtained in field experiment, implying that complete repeated P addition significantly increased P availability, reduced soil P transformation, and decreased P fixation. Therefore, a better agronomic performance of maize (P uptake, grain yield, and phosphorus use efficiency) was achieved in the complete repeated P application rather than basal application. Besides, diffusive gradient in thin film technique (DGT) was proved to be an accurate and powerful approach in testing soil available P. Conclusions Our findings elucidate that repeated delivering P through fertigation method can be recommended as an effective P application strategy in drip-irrigated field, especially in semi-arid and arid regions. The feasibility of DGT method was certified and C DGT -P could well characterize plant-accessible P.
研究领域:
农业
·
土壤学
·
植物营养
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Baowei Cao,Dachuan He,Fei Rao,Qadeer Ul Hassan,Xiaolong Cai,Lingna Liu,Fan Xue,Gangqiang Zhu
BiOI-loaded flower-like CeO 2 (BiOI/CeO 2 ) p-n heterojunction was synthesized via a simple two-step chemical route. The phase structure and chemical states of the heterojunction were analyzed by X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), respectively. The transmission electron microscopic (TEM) and the scanning electron microscope (SEM) reveal the close contact between BiOI and CeO 2 . The formation of the p-n heterojunction is verified by the Mott-Schottky curves. The p-type BiOI with a narrow band-gap when loaded on CeO 2 can not only improve the separation of photogenerated electron-hole pairs but also facilitate the absorption of visible light. The photo-oxidative removal efficiency of 9%BiOI/CeO 2 among other heterojunctions for NO reaches 45.49% and remains highly stable with an efficiency of 40.40% after the five cycles. Trapping experiments and ESR measurements were conducted to explore the contribution of charge carriers and the reactive oxygen species during the photocatalytic NO removal. This work highlights that constructing such p-n heterojunction by loading BiOI on CeO 2 microstructures can significantly enhance photocatalytic NO removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2017
·
IF 4.217
Qun-Zeng Huang,Ji-Chao Wang,Li-Qun Ye,Qian Zhang,Hong-Chang Yao,Zhong-Jun Li
The construction of p–n heterojunction is an efficient strategy to restrain photogenerated charge carriers recombination and enhance the photocatalytic efficiency toward H 2 evolution from water splitting. Herein a novel p–n heterojunction Mn 0.25 Cd 0.75 S/Co 3 O 4 was synthesized via facile hydrothermal method. Photocatalytic H 2 evolution of as-synthesized Mn 0.25 Cd 0.75 S/Co 3 O 4 composites in the absence of noble metal co-catalysts under visible light irradiation ( λ ≥ 400 nm) was investigated. The results demonstrated that photocatalytic H 2 evolution of Mn 0.25 Cd 0.75 S was significantly enhanced by loading Co 3 O 4 nanoparticles . It was confirmed that 0.48 wt% of Co 3 O 4 loading content achieved the highest H 2 evolution rate of 25.71 mmol/g/h, which was about 5.35 times higher than that of pure Mn 0.25 Cd 0.75 S. The remarkably improved photocatalytic activity could be attributed to the formation of the p–n junction at the interface between Mn 0.25 Cd 0.75 S and Co 3 O 4 , effectively promoting interfacial charge transfer and separation. This work revealed that the p–n heterojunction Mn 0.25 Cd 0.75 S/Co 3 O 4 may be a promising candidate for efficient energy conversion.
研究领域:
材料科学
·
能源转换
·
光催化
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 4
·830-838
·
IF 7.804
Shuai Wang,Haeseong Jang,Jia Wang,Zexing Wu,Xien Liu,Jaephil Cho
Graphical From tannic acid to water splitting : Amorphous Co−P/Co−N−C supported on N, P co-doped porous carbon (Co−P/Co−N−C/NPC) with a large specific surface area and abundant reactive sites is prepared. The material exhibits outstanding catalytic performance for the hydrogen evolution reaction (HER, η =234 mV at 10 mA cm −2 ), oxygen evolution reaction (OER, η =374 mV at 10 mA cm −2 ), and oxygen reduction reaction (ORR, E 1/2 =0.89 V, vs. RHE). It remains a tremendous challenge to develop a low-cost, earth-abundant, and efficient catalyst with multifunctional activities for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). Herein, a facile and scalable avenue was developed to prepare amorphous Co−P/Co−N−C supported on N, P co-doped porous carbon (Co−P/Co−N−C/NPC) with a large specific surface area (1462.9 m 2 g −1 ) and abundant reactive sites including Co−P, Co−N and NPC. The prepared electrocatalyst exhibits outstanding catalytic performance for HER ( η =234 mV at 10 mA cm −2 ), OER ( η =374 mV at 10 mA cm −2 ), and ORR ( E 1/2 =0.89 V, vs. reversible hydrogen electrode). Benefiting from the excellent HER performance and outstanding OER activity, the Co−P/Co−N−C/NPC delivers a current density of 10 mA cm −2 for overall water splitting at a cell voltage of 1.59 V, which is comparable with the IrO 2 –Pt/C couple electrode.
研究领域:
材料科学
·
电化学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Oceanology and Limnology
·
2020
·Vol. 38
·期 5
·1517-1531
·
IF 0.617
Tian Jing,Chen Zhuoyuan,Jing Jiangping,Feng Chang,Sun Mengmeng,Li Weibing
The Cu 2 O/TiO 2 p-n heterojunction composite photoelectrodes were prepared by depositing Cu 2 O nanoparticles on the surface of TiO 2 nanotubes via anodic oxidation and constant current deposition. Field emission scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) analyses showed that Cu 2 O nanoparticles not only deposited on the surface of TiO 2 nanotube array, but also on the wall of TiO 2 nanotubes. The Cu 2 O deposition amount could be adjusted by changing the deposition time. The photoelectrochemical cathodic protection (PECCP) performance of the prepared photoelectrodes for 316L stainless steel (SS) was tested under visible light. The constant current deposition time had a significant effect on the PECCP performance of Cu 2 O/TiO 2 -X photoelectrodes and Cu 2 O/TiO 2 -20 had the best PECCP performance for the coupled 316L SS. This was attributed to the appropriate amount and thickness of Cu 2 O to form p-n heterojunctions with TiO 2 , in which separation of the photogenerated carriers was accelerated and transfer of the photogenerated electrons to 316L SS for PECCP was facilitated.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Long Haoyu,Zhang Xidong,Zhang Zhenyi,Zhang Jianjun,Yu Jiaguo,Yu Huogen
The H 2 -evolution kinetics play a pivotal role in governing the photocatalytic hydrogen-evolution process. However, achieving precise regulation of the H-adsorption and H-desorption equilibrium (H ads /H des ) still remains a great challenge. Herein, we propose a fine-tuning d - p hybridization strategy to precisely optimize the H ads /H des kinetics in a Ni-B x modified CdS photocatalyst (Ni-B x /CdS). X-ray absorption fine-structure spectroscopy and theoretical calculations reveal that increasing B-atom amount in the Ni-B x cocatalyst gradually strengthens the d - p orbital interaction between Ni 3 d and B 2 p , resulting in a consecutive d -band broadening and controllable d -band center on Ni active sites. The above consecutive d -band optimization allows for precise modulation of the H ads /H des dynamics in the Ni-B x /CdS, ultimately demonstrating a remarkable H 2 -evolution activity of 13.4 mmol g -1 h -1 (AQE = 56.1 %). The femtosecond transient absorption spectroscopy further confirms the rapid electron-transfer dynamics in the Ni-B x /CdS photocatalyst. This work provides insights into the optimal design of prospective H 2 -evolution catalysts.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 53
·31848-31855
·
IF 3.119
Tao Ma,Yu Cui,Li Liu,Hao Luan,Jianwen Ge,Pengfei Ju,Fandi Meng,Fuhui Wang
Structural design and componential optimization are two primary directions in the study of microwave absorbers. In this study, a novel cobalt ferrite (CoFe2O4) decorated with p-phenylenediamine (PPD) functionalized graphene (PG/CoFe2O4) binary hybrid with unique hierarchical porous structure was synthesized by a two-step route. The chemical composition, morphology and electromagnetic parameters of the as-prepared sample were investigated successively. The porous CoFe2O4 microspheres with an average diameter of about 160 nm were uniformly anchored on rGO nanosheets. Owing to the uniquely hierarchical porous structure, synergistic effects of dielectric loss (conductive loss, interface and dipole polarization) and magnetic loss (eddy current loss, natural and exchange resonance), the as-prepared sample exhibited excellent microwave absorption (MA) performance. The maximum reflection loss (RLmax) could attain up to −53.3 dB, and the effective absorption bandwidth (EAB) reached 6.6 GHz (11.4–18.0 GHz) at 2.40 mm, which completely covered the Ku band. These results showed that this functional material can be applied in the MA field.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LETTERS IN APPLIED MICROBIOLOGY
·
2023
·Vol. 76
·期 8
·
IF 2.4
Wang Nengqiang,Li Xiaojun
(R)-1-(4-methoxyphenyl) ethanol [(R)-1b] is an essential precursor for the synthesis of aryl propanoic acids’ anti-inflammatatory drugs. Biocatalysts for (R)-1b preparation are limited and reductase has problems of low substrate concentration and low conversion rate. As a result, there is a constant need for discovering novel biocatalysts with excellent catalytic performances. In this study, a novel reductase LpSDR from Lacisediminihabitans profunda for the biocatalytic reduction of p-methoxyacetophenone (1a) to (R)-1b was obtained based on gene-mining technology, and some key reaction parameters were also investigated to improve the conversion rate of 1a using whole cells of recombinant Escherichia coli expressing reductase LpSDR as biocatalysts. It was found that the optimal concentration of isopropanol, ZnSO4·7H2O solution, 1a, and recombinant E. coli resting cells, the optimal reaction temperature, buffer pH, and reaction time were 1.95 mol l−1, 0.75 mmol l−1, 75 mmol l−1, 250 g (wet weight) l−1, 28°C, 7.0, and 21 h, respectively. Under the above conditions, a conversion rate of 99.5% and an enantiomeric excess of 99.6% were obtained, which were superior to the corresponding values previously reported. This study provides a novel reductase LpSDR, which is helpful in reducing 1a to (R)-1b.
研究领域:
生物化学
·
药物合成
·
酶工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYCYCLIC AROMATIC COMPOUNDS
·
2016
·
IF 0.959
Hongyun Nie,Maiqian Nie,Yongzhe Yang,Jing Zhao,Xinyi Zhang,Yutao Guo,Yi Wan,Jing Zi
Characterization of phenol metabolization by P. stutzeri N2 was proposed based on the identification of relevant metabolites and enzyme activities of catechol 1,2-oxygenase and catechol 2,3-dioxygenase. P. stutzeri N2 started to grow on 400 mg l−1 phenol with no obvious lag phase, and then phenol decomposition was rapidly completed within 32 h. Results of enzyme activities, UV spectrums of cultures, and the mass spectrum identification of cis, cis-muconic and 2-HMS, which showed that catechol C12O and C23O were acting simultaneously on the fission of the phenol ring. The existence of P-hydroxybenzoic acid and straight-chain saturated dicarboxylic acids in the culture medium showed that carboxylation and hydrogenation were involved during the phenol degradation. Metabolites containing five or four carbons indicated that catechol and its immediate ring-cleavage intermediates could be furthermore metabolized by P. Stutzeri N2. Therefore, P. stutzeri N2 which could degrade phenol with high efficiency and diverse pathways could have potential applications in the treatment of wastewater containing phenol.
研究领域:
环境微生物学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Materials
·
2019
·
IF 2.689
Xie Lijuan,Li Zhong,Sun Linchao,Dong Baoxia,Fatima Qawareer,Wang Zhe,Yao Zhengjun,Haidry Azhar Ali
Titanium dioxide is considered as one of the potential candidates for high-temperature gas sensing applications due to its excellent sensitivity and stability. However, its practical use as a gas sensor under elevated conditions is limited on account of its selectivity and insufficient understanding of response conversion from n- to p-type. To this context, the present work is intended to prepare and understand the p-type response of anatase TiO2 toward H2 gas (20–1,000 ppm) at elevated temperature (500°C). Sol-gel route is adopted to facilely synthesize powders containing pure and chromium (1–10 at.%) doped TiO2 nanoparticles, which are then brushed onto substrates with already patterned inter-digitated platinum electrodes. In this work, even, the undoped TiO2 samples showed p-type gas sensing response, which then decreased with Cr doping. However, in comparison to previously reported work, the sensing characteristics of all sensors is improved. For instance, 5 at.% Cr-TiO2 showed high response (147), fast response and recovery (142/123s) time, and good selectivity to hydrogen against monoxide and methane. Despite better response values, the TiO2 based samples show instability and drift in baseline resistance; such issues were not observed for Cr-doped TiO2 samples (≥3 at.%). The powders were further analyzed by XRD, SEM, TEM, and XPS to understand the basic characteristics, p-type response and stability. Further, a plausible sensing mechanism is discussed on basis of results obtained from aforementioned techniques.
研究领域:
材料科学
·
气体传感器技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）