ACS Sustainable Chemistry & Engineering
·
2020
·
IF 7.632
Yongyang Zhu,Liuzhang Ouyang,Hao Zhong,Jiangwen Liu,Hui Wang,Huaiyu Shao,Zhenguo Huang,Min Zhu
Sodium borohydride (NaBH4) has been identified as one of the most promising hydrogen storage materials; however, it is still challenging to produce NaBH4 with low cost and high efficiency, which are largely determined by the sources of boron and hydrogen and reducing agents used. Herein, we report an economical method to produce NaBH4 by ball milling hydrated borax (Na2B4O7·10H2O and/or Na2B4O7·5H2O) with different reducing agents such as MgH2, Mg, and NaH under ambient conditions. The direct use of natural hydrated borax avoids the dehydration process (at 600 °C) and consequently reduces cost and improves overall energy efficiency. A high yield of 93.1% can be achieved for a short ball mill duration (3.5 h) for Na2B4O7·5H2O-NaH-MgH2 system. In this system, H2 is generated in situ which subsequently reacts with Mg forming MgH2. Low cost Mg is therefore employed to replace the majority of MgH2, leading to an attractive yield of 78.6%. To further reduce the cost of raw materials and improve the utilization of hydrogen source in the hydrated borax, Na2B4O7·10H2O is used to partially substitute for Na2B4O7·5H2O, leading to a complete replacement of MgH2. Compared with literature results, the optimized recipe features low cost and high efficiency since it utilizes hydrogen from the hydrated water in natural borax and avoids high temperatures. Our finding is expected to facilitate applications of NaBH4 for hydrogen storage.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2020
·
IF 4.335
Lujia Mao,Chunlei Li,Libo Xiang,Dejun Fu,Wangyang Ma,Qing Ye
The synthesis of allenyl-Bdan has been realized via the Cu(I)-catalyzed borylation of propargylic alcohols. This methodology offers a facile and efficient pathway toward allenyboronates with diverse functional groups due to the simple access to the substrates. The substrates bearing ester groups are well-tolerated in the synthesis of allenyl-Bdan under the Lewis acidic conditions. The structures of two allenyl-Bdan were further confirmed via single-crystal X-ray diffraction.
研究领域:
有机化学
·
合成化学
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Zichang Wang,Jianyi Zuo,Qingyu Liu,Xueling Hou,Minqiang Gai
The first mixed alkali metal borosulfate compound, Li2NaB3S2O12 (LNBSO), which contains [BO3] groups, was designed and synthesized by using a high boron-to-sulfur ratio strategy through the high temperature solution method. LNBSO exhibits a birefringence of 0.057@546.1 nm in experiments, which was mainly contributed by the [BO3] groups, and possesses a short absorption edge at 184 nm, and the space group of LNBSO is P21/c. This newly synthesized borosulfate compound holds potential as a promising birefringent material within the deep-ultraviolet wavelength range. Moreover, the investigation on the relationship among the ratio of boron to sulfur, the dimensionality of the anionic framework, and the formation of [BO3] groups has been conducted on available borosulfate, providing insights for the synthesis of borosulfate with desirable performances.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Magnesium and Alloys
·
2022
·
IF 11.813
Yongyang Zhu,Mili Liu,liming Zeng,Yin Wang,Daifeng Wu,Rui Li,Qing Zhou,Renheng Tang,Fangming Xiao
The hydrolysis of MgH 2 delivers high hydrogen capacity (15.2 wt%), which is very attractive for real-time hydrogen supply. However, the formation of a surface passivation Mg(OH) 2 layer and the large excess of H 2 O required to ensure complete hydrolysis are two key challenges for the MgH 2 hydrolysis systems. Now, a low-cost method is reported to synthesize MgH 2 @Mg(BH 4 ) 2 composite via ball-milling MgH 2 with cheap and widely available B 2 O 3 (or B(OH) 3 ). By adding small amounts of B 2 O 3 , the in-situ formed Mg(BH 4 ) 2 could significantly promote the hydrolysis of MgH 2 . In particular, the MgH 2 –10 wt% B 2 O 3 composite releases 1330.7 mL·g −1 H 2 (close to 80% theoretical hydrogen generation H 2 ) in H 2 O and 1520.4 mL·g −1 H 2 (about 95%) in 0.5 M MgCl 2 in 60 min at 26 °C with hydrolysis rate of 736.9 mL·g −1 ·min −1 and 960.9 mL·g −1 ·min −1 H 2 during the first minute of the hydrolysis, respectively. In addition, the MgCl 2 solution allows repeated use by filtering and exhibits high cycle stability (20 cycles), therefore leading to much reduced capacity loss caused by the excess H 2 O. We show that by introducing B 2 O 3 and recycling the 0.5 M MgCl 2 solution, the system hydrogen capacity can approach 5.9 wt%, providing a promising hydrogen generation scheme to supply hydrogen to the fuel cells.
研究领域:
材料科学
·
能源化学
·
无机合成
·
氢能技术
·
表面工程
✓ 已验证
DOI
高影响因子
CORROSION SCIENCE
·
2017
·
IF 5.245
Shengli Cheng,Zhihuan Weng,Xin Wang,Yunxing Pan,Xigao Jian,Jinyan Wang
To improve the oxidation resistance of carbon fibers, a series of carborane-containing polymer-based coatings were prepared. The oxidation resistance and microstructure of the coatings were investigated. According to XPS, FT-IR and XRD analysis, the high oxidation resistance of the polymer-based coatings was attributed to the boron oxide protective layer formed from the oxidation of carborane groups in the coating. Ceramic coatings were prepared from heat treatment of polymer-based coatings under argon at 1300 °C for 2 h. The great oxidation resistance of the ceramic coating was attributed to the existence of boron carbide in coating.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Guilong Zhang,Shiyao Lu,Junchao Qian,Kai Zhong,Jianming Yao,Dongqing Cai,Zhiliang Cheng,Zhengyan Wu
We developed a highly efficient magnetic relaxation switch (MRS) system based on poly(vinyl alcohol) functionalized nanomagnetic iron oxide (PVA@NMIO) particles for the detection of boric acid or borate ester (BA/BE). It was found that the addition of BA/BE induced the aggregation of PVA@NMIO particles, resulting in a measurable change in the T2 relaxation time in magnetic resonance measurements. The main mechanism was proposed that the electron-deficient boron atoms of BA/BE caused the aggregation of PVA@NMIO particles through covalent binding to the hydroxyl groups of PVA. This novel detection system displayed excellent selectivity, high sensitivity, and rapid detection for BA/BE. Thus, this system may provide a great application prospect for detection of BA/BE.
研究领域:
分析化学
·
材料科学
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Xin Zhou,Xu-Feng Meng,Jun-Min Wang,Ning-Zhao Shang,Tao Feng,Zheng-Yang Gao,Hao-Xu Zhang,Xun-Lei Ding,Shu-Tao Gao,Cheng Feng,Chun Wang
Herein, ternary metal phosphides NiCoP nanoparticles supported on porous hexagonal boron nitride (h-BN) was fabricated via hydrothermal-phosphorization strategy. The as-prepared Ni 0.8 Co 1.2 P@h-BN exhibited excellent catalytic performance for the hydrogen generation from ammonia borane (AB) hydrolysis, with an initial turnover frequency of 86.5 mol(H 2 ) mol(Ni 0.8 Co 1.2 P) −1 min −1 at 298 K. The experimental outcome can be attributed to the synergistic effect between Ni, Co and P, as well as the strong metal-support interaction between NiCoP and h-BN. This study presents a new paradigm for supporting transition metal phosphides, and provides a new avenue to develop high performance and low cost non noble metal catalysts for hydrolysis of AB.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2023
·Vol. 415
·期 14
·2775-2780
·
IF 4.3
Jin Shanxia,Li Yaqin,Yang Liuquan,Li Wei,Zhou Ping
The affinity interactions between boronic acids and sugars have been successfully exploited in many fields, such as the sensing of saccharides, selective enrichment of glycoconjugates, and drug delivery. However, despite multiple techniques having been adopted to investigate the reaction of boronate affinity, the pathway of boronate esters formation under aqueous conditions remains controversial. We report a MALDI-MS approach to investigate the interactions between phenylboronic acid and monosaccharides in neutral aqueous solution by using polylevodopa as an innovative substrate instead of conventional matrix. A series of unusual tri-benzeneboronic esters were then revealed. The mass spectrometry data indicate that they bear a dibenzenepyroboronate cyclic ester moiety with seven-membered ring or eight-membered ring. With the aid of theoretical computations, their most likely geometrical structures are elucidated, and these tri-benzeneboronic esters are proposed to be formed via a boroxine binding monosaccharide pathway. This work provides more insight into the mechanism of boronate affinity interaction between boronic acid and sugars and proves the developed MALDI-MS approach is promising for studying interactions between small molecules. Graphical Abstract
研究领域:
分析化学
·
理论化学
·
糖化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 24
·5499-5507
·
IF 8.928
Jilong Li,Yanhui Wang,Hongwei Gao,Shiwei Song,Bowen Lu,Xueqing Tian,Shuyu Zhou,Yungang Yuan,Jianbing Zang
Graphical Put on your coat : Ni x B/B 4 C particles embedded in B-doped phenolic resin-derived carbon coating on nickel foam are prepared for efficient water/seawater electrolysis by directly soaking nickel foam in a mixture of phenolic resin and B 4 C, followed by an 800 °C annealing. The coating effectively protects the catalyst from the corrosion by seawater and facilitates the transport of electrons. Electrolysis of seawater can be a promising technology, but chloride ions in seawater can lead to adverse side reactions and the corrosion of electrodes. A new transition metal boride-based self-supported electrocatalyst was prepared for efficient seawater electrolysis by directly soaking nickel foam (NF) in a mixture of phenolic resin (PR) and boron carbide (B 4 C), followed by an 800 °C annealing. During PR carbonization process, the reaction of B 4 C and NF generated nickel boride (Ni x B) with high catalytic activity, while PR-derived carbon coating was doped with boron atoms from B 4 C (B−C PR ). The B−C PR coating fixed Ni x B/B 4 C particles in the frames and holes to improve the space utilization of NF. Meanwhile, the B−C PR coating effectively protected the catalyst from the corrosion by seawater and facilitates the transport of electrons. The optimal Ni x B/B 4 C/B−C PR /NF required 1.50 and 1.58 V to deliver 100 and 500 mA cm −2 , respectively, in alkaline natural seawater for the oxygen evolution reaction.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2020
·
IF 2.888
Sa-Ying Li,Pan Liang
Two alkaline-earth metal borates BaZn 2 B 2 O 6 with NLO property and Ba 2 Cd(B 3 O 6 ) 2 with birefringent property have been synthesized and characterized by XRD, FT-IR, and chemical analysis. The molar enthalpies of solution of BaZn 2 B 2 O 6 (s) and Ba 2 Cd(B 3 O 6 ) 2 (s) in 2.00 mL of 1 mol·dm −3 HCl(aq) were measured by microcalorimeter at T = 298.15 K, respectively. The molar enthalpies of solution of CdCl 2 ·2.5H 2 O(s) and ZnO(s) in the mixture solvent of 2.00 mL of {1 mol·dm –3 HCl + H 3 BO 3 + Ba(OH) 2 ·8H 2 O} (aq) were also measured, respectively. With the incorporation of the previously determined enthalpies of solution of H 3 BO 3 (s) in 2.00 mL of 1 mol· dm –3 HCl (aq), Ba(OH) 2 ·8H 2 O) in the mixture solvent of (2.00 mL of 1 mol·dm −3 HCl + H 3 BO 3 ) (aq), together with the standard molar enthalpies of formation for CdCl 2 ·2.5H 2 O(s)/ZnO(s), Ba(OH) 2 ·8H 2 O(s), H 3 BO 3 (s), HCl (aq) and H 2 O (l), the standard molar enthalpies of formation of – (2703.0 ± 2.2) kJ·mol −1 for BaZn 2 B 2 O 6 (s) and – (5625.26 ± 5.1) kJ·mol −1 for Ba 2 Cd(B 3 O 6 ) 2 at T = 298.15 K were obtained on the basis of the appropriate thermochemical cycles.
研究领域:
无机化学
·
物理化学
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-11
·
IF 5.578
Yao Qilu,Lu Zhang-Hui,Yang Kangkang,Chen Xiangshu,Zhu Meihua
Ultrafine ruthenium nanoparticles (NPs) within the mesopores of the SBA-15 have been successfully prepared by using a “double solvents” method, in which n -hexane is used as a hydrophobic solvent and RuCl 3 aqueous solution is used as a hydrophilic solvent. After the impregnation and reduction processes, the samples were characterized by XRD, TEM, EDX, XPS, N 2 adsorption-desorption and ICP techniques. The TEM images show that small sized Ru NPs with an average size of 3.0 ± 0.8 nm are uniformly dispersed in the mesopores of SBA-15. The as-synthesized Ru@SBA-15 nanocomposites (NCs) display exceptional catalytic activity for hydrogen generation by the hydrolysis of ammonia borane (NH 3 BH 3 , AB) and hydrazine borane (N 2 H 4 BH 3 , HB) at room temperature with the turnover frequency (TOF) value of 316 and 706 mol H 2 (mol Ru min) −1 , respectively, relatively high values reported so far for the same reaction. The activation energies ( E a ) for the hydrolysis of AB and HB catalyzed by Ru@SBA-15 NCs are measured to be 34.8 ± 2 and 41.3 ± 2 kJ mol −1 , respectively. Moreover, Ru@SBA-15 NCs also show satisfied durable stability for the hydrolytic dehydrogenation of AB and HB, respectively.
研究领域:
纳米催化
·
能源材料
·
无机化学
·
氢气储存与释放
·
多相催化
✓ 已验证
DOI
高影响因子
INSTRUMENTATION SCIENCE & TECHNOLOGY
·
2016
·
IF 0.525
Fei Wu,Ting Li,Xiu Ru Yang,Cheng Ming Li,Mei Qiang Fan,Kangying Shu
Cobalt boride nanoparticles were deposited on the surface of Mobil Crystalline Material 41 (MCM-41) and the catalytic activity for sodium borohydride hydrolysis was characterized. The transition from cobalt boride particle to cobalt boride layer was evaluated, and the catalytic activity of cobalt boride was improved because of the MCM-41. The catalytic activity increased with the cobalt boride/MCM-41 mass ratio from 1:4 to 1:1. A cobalt boride/MCM-41 mass ratio of 1:1 provided high catalytic activity similar to cobalt boride. Sintered measurements showed that the catalytic activity was from amorphous cobalt boride and not from crystalline cobalt boride. Sintering resulted in the conversion of amorphous cobalt boride to crystalline cobalt boride and damaged the nanostructure of the amorphous cobalt boride framework.
研究领域:
材料科学
·
化学工程
✓ 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）