EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2021
·Vol. 2021
·期 29
·3013-3018
·
IF 2.524
Yi Wang,Jialu Shen,Yu Huang,Xiang Liu,Qiuxia Zhao,Didier Astruc
Graphical Metal-free H 2 or D 2 evolution is obtained in a few minutes from acid- or base-catalyzed hydrolysis of diboronic acid, respectively, under ambient conditions and is coupled to hydrogenation reactions. Kinetic studies allow proposing mechanisms by considering primary kinetic isotope effects observed for both acid- and based-catalyzed reactions with D 2 O. The efficient production of H 2 from hydrogen-rich sources, particularly from water, is a crucial task and a great challenge, both as a sustainable energy source and on the laboratory scale for hydrogenation reactions. Herein, a facile and effective synthesis of H 2 and D 2 from only acid- or base-catalyzed metal-free hydrolysis of B 2 (OH) 4 , a current borylation reagent, has been developed without any transition metal or ligand. Acid-catalyzed H 2 evolution was completed in 4 min, whereas the base-catalyzed process needed 6 min. The large kinetic isotopic effects for this reaction with D 2 O, deuteration experiments and mechanistic studies have confirmed that both H atoms of H 2 originate from water using either of these reactions. This new, metal-free catalytic system holds several advantages, such as high efficiency, simplicity of operation, sustainability, economy, and potential further use.
研究领域:
化学
·
能源科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 9
·090554
·
IF 4.316
Donghai Huang,Zhiqiang Ge,Changfu Yuan,Ao Mei,Zhiyong Fu,Zhiping Le
Bis(neopentyl glycolato)diboron (BNGDB) is used as a electrolyte additive to improve the stability of commercialized lithium ion batteries operating at a high charging-cutoff voltage. Adding of BNGDB lowers the oxidation potential of the electrolyte, which will lead to the formation of a uniform, stable, and low resistance cathode solid electrolyte interphase (CEI) on the cathode surface. This CEI film can suppress the loss of electrolyte by preventing further reaction between electrolyte and cathode material (LiNi0.6Co0.2Mn0.2O2), which improves cyclic stability and discharge capability of LiNi0.6Co0.2Mn0.2O2/graphite pouch cells. With 0.5 wt% BNGDB addition, the pouch cell demonstrate a discharge capacity retention of 83.2% after 200 cycles in base electrolyte. This work brings new insight into the role of additives in electrolytes and can guide the design of more versatile electrolytes for commercialized lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 18
·4374
·
IF 4.2
Ying Bian,Chenqing Xiang,Yi Xu,Rongping Zhu,Shuanglin Qin,Zhijun Zhang
Lonicerae japonicae flos (LJF) and Lonicerae flos (LF) are traditional Chinese herbs that are commonly used and widely known for their medicinal properties and edibility. Although they may have a similar appearance and vary slightly in chemical composition, their effectiveness as medicine and their use in clinical settings vary significantly, making them unsuitable for substitution. In this study, a novel 2 × 3 six-channel fluorescent sensor array is proposed that uses machine learning algorithms in combination with the indicator displacement assay (IDA) method to quickly identify LJF and LF. This array comprises two coumarin-based fluorescent indicators (ES and MS) and three diboronic acid-substituted 4,4′-bipyridinium cation quenchers (Q1–Q3), forming six dynamic complexes (C1–C6). When these complexes react with the ortho-dihydroxy groups of phenolic acid compounds in LJF and LF, they release different fluorescent indicators, which in turn causes distinct fluorescence recovery. By optimizing eight machine learning algorithms, the model achieved 100% and 98.21% accuracy rates in the testing set and the cross-validation predictions, respectively, in distinguishing between LJF and LF using Linear Discriminant Analysis (LDA). The integration of machine learning with this fluorescent sensor array shows great potential in analyzing and detecting foods and pharmaceuticals that contain polyphenols.
研究领域:
分析化学
·
药学
·
中药学
·
机器学习
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Weidong Chen,Guotao Wu,Teng He,Zhao Li,Zaiping Guo,Huakun Liu,Zhenguo Huang,Ping Chen
Octahydrotriborates are potential hydrogen storage materials and chemical vapor deposition precursors to boride films. Their syntheses have been quite challenging, however. In this paper, an improved facile route for the preparation of unsolvated sodium octahydrotriborate (NaB 3 H 8 ), which is an important precursor to other octahydrotriborates and derivatives, is reported. The key steps in the synthesis involve dispersing Na finely in inert media and preparing fresh tetrahydrofuran (THF)·BH 3 at room temperature . High purity unsolvated NaB 3 H 8 can be obtained in tens of grams or more in one batch, depending on the reactor size. Using NaB 3 H 8 as the precursor, sodium dodecaborate (Na 2 B 12 H 12 ) has been successfully synthesized. Both octahydrotriborates and dodecaborates have been observed as intermediates during the thermal dehydrogenation of borohydrides , and their facile syntheses would facilitate mechanistic studies on the hydrogen storage of borohydrides , among other potential applications.
研究领域:
材料科学
·
化学
·
氢存储
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Menghua Li,Juntao Wang,Caina Jiao,Chun Wang,Qiuhua Wu,Zhi Wang
1,4-Phenyldiboronic acid (1,4-PDBA) linked graphene oxide framework (GOF) was prepared via an one-step, catalyst-free and hydrothermal route. To evaluate its adsorption performance, the prepared GOF was served as an adsorbent for solid phase extraction of phenylurea herbicides (PUHs) from water and celery samples prior to their determination by high performance liquid chromatography. The results indicated that GOF exhibited excellent adsorption capacity for the target PUHs. Under the optimum conditions, the method showed high recoveries ranged from 86.0% to 112.0%, low relative standard deviations (<5.4%) and low limits of detection ranged from 0.01 to 0.02 ng mL −1 for water and 0.025–0.050 ng g −1 for celery sample, respectively. These results indicated the great application potential of GOF in the enrichment of organic pollutants from different matrix samples.
研究领域:
环境科学
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 42
·19846-19853
·
IF 7.233
Bin Qi,Xin Li,Liang Sun,Bo Chen,Hao Chen,Chenchen Wu,Haibo Zhang,Xiaohai Zhou
Supramolecular nano-assemblies with tunable morphology have attracted extensive attention in composite material manufacturing and many other fields. Herein, a new class of shape-controlled dodecaborate-based supramolecular organic frameworks (BOFs), decorated with diverse ultrafine noble metal clusters (Au, Pd, Pt, Ag), has been successfully fabricated via the tunable host–guest assembly of cucurbit[n = 5,6,7,8]uril and Cs2[closo-B12H12]. Due to the unique dodecaborate-cucurbit[n]uril chaotropic effect, a breakthrough has been made in modulating the supramolecular frameworks in the urchin-like, network-like or octahedron-like structures without tedious chemical modifications or additional additives. More interestingly, Cs2[closo-B12H12], a prominent component in supramolecular structures, can also play dual roles as an excellent reductant and capping agent for the formation of metal clusters. The final product, i.e., BOFs decorated with ultrafine metal clusters (metal/BOFs) can be precipitated from aqueous solutions rapidly and they show high catalytic activity and recyclability in Suzuki reactions and in the selective reduction of furfural (FAL) to furfuryl alcohol (FOL).
研究领域:
材料科学
·
化学工程
·
纳米技术
·
催化
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Wenhui Liu,Fan Nie,Haojing Jiang,Yinan Zhao,Yan Zhang,Zheng Zhang,Jie Zhang,Jing Xu,Yuanqiang Guo
Hydrophobic chemotherapy drugs face significant challenges in cancer treatment, including low bioavailability, unavoidable toxic side effects, and the development of drug resistance. To address these issues, a multifunctional nanoplatform was developed for cancer therapy, aimed at achieving effective drug delivery and enhancing antitumor efficacy. Poria cocos polysaccharide (PCP), a natural polymer known for its immunomodulatory properties, was utilized as an immunoreactive vector for drug delivery after being cross-linked with 1,4-phenylenebisboronic acid (BDBA). Subsequently, a small-molecule chemotherapy drug, esculetin (EL), was confirmed through density functional theory (DFT) simulations to be encapsulated within the PCP-BDBA nanoparticles via weak interactions. The results demonstrated that the synthesized nanoparticles were spherical, with an average particle size of 162.0 nm. In addition to exhibiting excellent stability, the nanoparticles also displayed pH-responsive drug release properties. In vivo experiments indicated that EL@PCP-BDBA NPs exhibited antitumor effects. Furthermore, EL@PCP-BDBA NPs showed superior in vitro antitumor activity compared to EL at the cellular level. Additionally, EL@PCP-BDBA NPs were found to increase intracellular reactive oxygen species (ROS) levels, induce cell apoptosis, and suppress cell migration to combat cancer. Meanwhile, EL@PCP-BDBA NPs enhanced immune function in vivo. In summary, this study developed a nano-pharmaceutical that combined chemotherapy and immunotherapy functions, which was considered a promising tool for cancer therapy.
研究领域:
纳米技术
·
癌症治疗
·
药学
·
免疫学
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）