Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 38
·20453-20463
·
IF 14.511
Xiaofeng Li,Xupo Liu,Cuicui Zhang,Ran Wang,Gangya Wei,Tianfang Yang,Jing Zhang,Ye Chen,Shuyan Gao
Developing cost-effective and durable hydrogen evolution reaction (HER) catalysts is imperative for electrochemical water splitting. Herein, a facile corrosion-etching strategy has been applied to synthesize RuO2 coupled with defective NiFeZn(OH)x on NiFe foam (NFF) at room temperature, achieving a D/NFF-Ru-Zn electrocatalyst with abundant structural defects. Benefiting from the abundant exposed defective sites and the synergistic effect between defective NiFeZn(OH)x and RuO2, D/NFF-Ru-Zn efficiently improves the poor intrinsic conductivity of NiFe hydroxide and reduces the kinetic energy barrier of the Volmer step, thus accelerating the HER kinetics. The prepared D/NFF-Ru-Zn catalyst demonstrates excellent activity with an overpotential of 90 mV at 100 mA cm−2, as well as prominent durability of operating at 100 mA cm−2 for 100 h. Furthermore, integrated with a NiFe-OH electrode, the assembled water splitting device displays a low voltage of 1.67 V at 500 mA cm−2. Remarkably, the corrosion-etching strategy employed in this work can be extended to other substrates (e.g., Ni foam and Fe foam), providing a potential perspective for designing efficient HER electrocatalysts.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Yingqing Zhao,Rui Liu,Christian Marcus Pedersen,Zhenzhou Zhang,Zhaohui Guo,Honghong Chang,Yingxiong Wang,Yan Qiao
Lactic acid (2-hydroxypropionic acid, LA) can be produced from abundant and renewable biomass resources via chemocatalytic processes, which exhibited high potential for meeting its tremendous demand in a wide range of applications. The basic Ba(OH) 2 could efficiently catalyze the conversion of d -glucose into LA. In the present study, by utilizing various NMR techniques including, chemical shift titration, 2D diffusion ordered spectroscopy (DOSY) analysis, heteronuclear singular quantum correlation ( 1 H– 13 C HSQC), the binding sites and catalytic interaction between d -glucose and catalyst were clarified. The experimental results by NMR and electrospray ionization mass spectrometry (ESI–MS) were used to explore the reaction mechanism. Experimental results disclosed that the catalyst, Ba(OH) 2 , may exist in the form of [Ba(OH)(H 2 O) 2 ] + under the reaction condition. The OH – of [Ba(OH)(H 2 O) 2 ] + is attached to the C5-O of d -glucose, and Ba 2+ is connected to the C1-O of d -glucose. Herein, we suppose that Ba(OH) 2 and d -glucose interact and form a complex, d -glucopyranose-[Ba(OH)(D 2 O) 2 ] + . Furthermore, when the reaction was performed in D 2 O, we were surprised to find that LA underwent varying degrees of deuteration. The reaction mechanism, binding sites and deuteration of the product have shed light on the efficient conversion of biomass to LA.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Yingcong Wei,Wenying Zha,Lele Wang,Xiongfeng Ma,Shaohui Zhang,Rongjian Sa,Huaxiang Lin,Zhengxin Ding,Jinlin Long,Xianzhi Fu,Rusheng Yuan
Tailoring the surficial chemical environment of two-dimensional materials by organic modification is an effective way to optimize their catalytic behaviors. Herein, we present a dynamic coordination approach to improve the photocatalytic performance of ultrathin Co 2 CO 3 (OH) 2 nanosheets (u-CoCH) in NIR light (λ > 780 nm) driven carbonylation reaction by using the reacting substrates (diamines) as the ligands. The coordination of diamines with surface Co 2+ ions form a binuclear complex at the crystallographic planes of u-CoCH. The as-formed complexes can reduce the energy barrier of carbonylation reaction by weaking the N-H bond of the substrate on u-CoCH, and afford enhanced light response as well as the prolonged photogenerated electron lifetime. Together with the successful synthesis of a series of important structural motifs in pharmaceuticals and bioactive agents, the promoted photosynthesis reaction mode via in-situ formed surface complexes offers a model toward full-spectrum-solar-energy conversion in the field of chemical synthesis.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Muhammad Waqas,Chengzhou Liu,Qiulan Huang,Xiaoxia Zhang,Youjun Fan,Zhe Jiang,Xiaoqu Wang,Wei Chen
Precise control over the structure and morphology of nano/microarchitectures is the topic of immense interest to tune their physical features and chemical aspects for desired applications. In this work, a novel and effective Ni(OH) 2 three-dimensional nanosheet-coated marigold-like ZnO microflower (mg-ZnO@Ni(OH) 2 NSs) hybrid is designed for the nonenzymatic electrochemical determination of glucose. The morphological evolution of mg-ZnO and mg-ZnO@Ni(OH) 2 NSs was achieved by a one-pot solvothermal strategy through control over the reaction conditions without any assistance of an external shape-controlling surfactant. Furthermore, the as-fabricated mg-ZnO and mg-ZnO@Ni(OH) 2 NSs were systematically evaluated by different spectroscopic, microscopic and electrochemical characterization tools. The results indicate that highly exposed homogeneous nanocorners of mg-ZnO and the synergetic effect of Ni(OH) 2 coating, collectively improve the electrocatalytic efficiency of the designed catalyst. The mg-ZnO@Ni(OH) 2 NS-based sensing electrode exhibits excellent amperometric performance for glucose monitoring, comprising satisfactory sensitivity (259.78 and 62.82 μA mM −1 cm −2 ), wide linear range (0.084–0.941 mM and 0.941–6.50 mM), low limit of detection (0.06 µM, S / N = 3), good stability and high detection selectivity. Moreover, the designed sensor is promising for the potential application in the real-time glucose detection of human serum samples.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 48
·18061-18068
·
IF 4.39
Jiahui Guo,Xueqing Feng,Songrui Wang,Qikang Wu,Shanshan Lv,Yan Zhou,Han Li,Zheng Chen,Yuzhong Zhang
Novel hexagonal α-cobalt hydroxide nanosheets are synthesized through a 2-methylimidazole-induced hydrolysis strategy with cetyltrimethylammonium bromide (CTAB) as a surfactant. The weak alkaline environment provides favorable conditions for the formation of metastable α-Co(OH)2, while the same raw material will produce β-Co(OH)2 when a strong alkali solution is used. CTAB plays a vital role not only in hexagonal oriented growth, but also in the formation of the hydrotalcite-like structure of α-Co(OH)2 with high crystallinity. The crystallinity of both α- and β-Co(OH)2 is very poor without CTAB as a surfactant. The Co in this Co(OH)2−x layer presents most of the CoII and a small part of the CoIII, and the interlayer nitrate anion balances the positive charge of the host layer. The redox function produced by the CoII and CoIII of α-Co(OH)2 together with the large layer spacing jointly promotes the electron and mass transfer. The use of hydrazine hydrate for transfer hydrogenation involves the transport of protons and electrons produced by decomposition, and the rapid transport is bound to be conducive to the reduction process. Nitro compounds with varieties of functional groups can be smoothly reduced to the corresponding amines with high selectivity, when α-Co(OH)2 was used as a catalyst under mild conditions.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2023
·
IF 3.3
Haijun Chang,Yuanwei Shi,Jie Xiong,Zhaoying Bo,Yan Dai
Summary This study investigated the effects of the combination of Gaphalium affine extract (GAE) and sodium pyrophosphate (PP) on the structure and oxidative stability of porcine myofibrillar proteins (MPs) under oxidative stress. The results showed that GAE was rich in total flavonoids and total phenols (37.09% and 67.50%, respectively). GAE had strong free radical scavenging ability, especially for • OH, and the semi-inhibitory concentration (IC 50 ) of • OH reached as high as 3.59 μg/mL, which was slightly lower than that of the standard antioxidant vitamin C (V c ). The addition of GAE and PP significantly inhibited the formation of carbonyl groups compared to the control group ( P < 0.05). The presence of GAE further promoted the loss of total sulphydryl groups by 3.52% compared to the oxidative control group ( P < 0.05). However, PP and PP+G significantly inhibited the loss of total sulphydryl groups ( P < 0.05). The further reduction in the carbonyl content, increase in the hydrogen bond content, inhibition of the conversion of sulphydryl groups to disulphide bonds, and decrease in the cross-linking aggregation of corresponding proteins all indicate that GAE and PP could cooperatively regulate the oxidation of MPs. An appropriate amount of PP effectively modified the damage caused by GAE on both the secondary and tertiary structure of MPs to maintain their structural stability, however, a relatively higher concentration of PP led to a substantial degree of MP collapse and affected the quality of the proteins. These results suggest that the oxidative stability of MPs can be improved by the addition of an appropriate amount of GAE (0.2 mg/g protein) combined with PP (1 mM).
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2023
·
IF 8.4
Zhijia Liao,Zhenyu Yuan,Hongliang Gao,Fanli Meng
In response to the pressing demand for acetic anhydride gas detection, this study introduces a novel gas sensor for precisely detecting acetic anhydride concentrations. The optimum conditions for the synthesis of cobalt hydroxyfluoride/cobalt oxide (CHFCO) heterojunctions with good acetic anhydride gas sensitivity were determined by carefully adjusting the calcination time, hydrothermal time and ammonium fluoride content. The best performing composite CHFCO sensor with porous rod particles was tested at 180 ℃ and achieved a response rate of 260 for 100 ppm acetic anhydride gas, with response and recovery times of 60 and 40 s, respectively. In comparison to other prepared sensors, the detection response for acetic anhydride was improved by a factor of 4.30–23.63. Moreover, the CHFCO sensor reliably detected acetic anhydride at a concentration of 500 ppb, exhibiting a response value of 1.56. Notably, the sensor demonstrated great selectivity, moisture resistance , and stability. The findings highlight the significant enhancements in gas-sensitive performance to acetic anhydride achieved by the abundant hydroxyl bonds on the surface of CHFCO heterojunction, the presence of fluorine ions , and the modulation of the band gap. These results provide valuable insights for the advancement of acetic anhydride gas sensors based on CHFCO heterojunction.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Sitong Liu,Guangmin Ren,Xiangchao Meng
A BrO3–-modified Bi2O3/Bi(OH)3 heterojunction photocatalyst was in situ fabricated by a facile one-pot method and applied in photocatalytic nitrogen fixation. In comparison with Bi(OH)3, the Bi2O3/Bi(OH)3 heterojunction has a larger specific surface area from the nanoflower-like morphology and an extended visible light absorption range. Of special importance, the proper band gap match between Bi(OH)3 and Bi2O3, the multiple charge transfer channels via the BrO3– bridge, and the oriented electron migration in the type-II heterojunction mechanism make a stronger charge separation efficiency. Therefore, the BiO/BiHO-3 sample presented the highest photocatalytic nitrogen reduction performance with an ammonia production rate of 45.28 μmol g–1 h–1, which was 10 times higher than that of Bi(OH)3. Photogenerated cavities are consumed during H2O oxidation to produce O2 and H2O2. However, the O2 production was small, and the H2O2 yield was about 78.5 μmol g–1 h–1. For CO2 reduction, the CO production rate was 52.86 μmol g–1 h–1, which was 1.6 and 1.9 times those of Bi(OH)3 and Bi2O3. This work provides useful guidance for the design and synthesis of efficient catalysts for photocatalytic N2 fixation.
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Weiwei Yang,Mao Peng,Ye Lv,Mengya Sun,Jinli Zhang,Wei Li,Yan Fu
2-Hydroxybenzaldehyde (SALD) exhibits special reactivity in various chemical reactions due to the existence of aldehyde and hydroxyl groups, which also make it a challenge to achieve high conversion and selectivity for SALD production. Herein, β-Ni(OH) 2 nanosheets over nickel foam (NF) at different hydrothermal temperatures were synthesized for electrocatalytic oxidation (ECO) of 2-hydroxybenzyl alcohol (SAL) into SALD. The β-Ni(OH) 2 electrode obtained at 160 °C achieves the best ECO performance in 2.5 M KOH at the applied potential of 1.45 V (RHE), showing the SALD selectivity of 78.90% and the Faradaic efficiency of 87.94% at the SAL conversion of 69.76%. ECO of SAL reduces the cell voltage and boosts the hydrogen productivity by 2.74 times. It is of great importance to find that potential-driven surface reconstruction of β-Ni(OH) 2 enables selective conversion of SAL into SALD. Side reactions including OER as well as oxidation of phenolic group can be effectively controlled via regulating applied potentials on β-Ni(OH) 2 . This work is the first report on direct electrochemical oxidation of SAL with high SALD selectivity, and offers a green and clean strategy for highly selective production of SALD under mild conditions.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2023
·
IF 4
Zong-Bao Yu,Zhuozhuo Song,Peng Zheng,Jie Sun,Zhanxu Yang
Transition metal sulfides (TM sulfides) has long been regarded as highly promising materials for catalyzing oxygen evolution reaction (OER). The function of TM sulfides in OER occurs on TM oxyhydroxide and SO 4 2− , which are formed through surface reconstruction under certain potentials. It is worth noting that the impact of SO 4 2− on the local charge distribution among atoms, a crucial determinant of OER performance, has been insufficiently studied. This study aims to investigate the role of SO 4 2− in mediating the partial redistribution of charges among Co, Ni and O atoms on a precatalyst Co 9 S 8 /C–Ni(OH) 2 electrode. The electrode undergoes self-reconstruction to form a CoOOH/SO 4 2− /NiOOH structure on its surface that is active for the OER. The results demonstrate that SO 4 2− facilitates the local charge redistribution of active atoms, leading to optimized adsorption energy of OER intermediates and increased redox center of the material. Furthermore, SO 4 2− serves as an electron mediator in the OER process under varying applied voltages. Consequently, CoOOH/SO 4 2− /NiOOH achieves a Tafel slope of 56 mV dec −1 , an overpotential of 250 mV, and maintains a high stability for over 100 h at a current density of 20 mA cm −2 . Overall, this research provides valuable insights into catalytic reaction mechanisms and the design of efficient composite catalysts.
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2021
·
IF 5.062
Zijing Wang,Changjuan Mo,Sixuan Xu,Shanshuai Chen,Tiansheng Deng,Wanbin Zhu,Hongliang Wang
The catalytic conversion of carbohydrate to platform chemicals, e.g. lactic acid (LA), is the key to unlock the potential of biomass. In this study, we report that the combination of Ba(OH) 2 and Ca(OH) 2 can efficiently catalyse high-concentration (> 0.5 M) of glucose to relatively high yield of LA (> 40 %) under mild conditions (60 °C). Both glucose conversion and LA yield were sensitive to the pH of the catalytic system. A high loading of Ba(OH) 2 led to a high initial pH of the reaction solution, resulting in serious side reactions. While, a low loading of Ba(OH) 2 led to a quike decrease of OH − and Ba 2+ both of which were continuously consumpted by the formed LA. The combination of Ca(OH) 2 with Ba(OH) 2 could significantly improve LA yield, since Ca(OH) 2 , with limited solubility, could act as a controlled-release catalyst for the real-time supply of OH − and Ca 2+ . OH − was indispensable for glucose isomerization to fructose as well as for fructose retro-aldol reaction to C 3 intermediates. Ca 2+ could combine with LA to form stable calcium lactate, liberating Ba 2+ to catalyse the conversion of C 3 intermediates to LA. Under the preliminary optimized reaction conditions, the yield of LA could be reached to 42.55 % and 38.32 % from 0.5 M and 1 M glucose, respectively. This catalytic system has advantages of mild reaction condition, short reaction time, and capable of conversion of high-concentration substrates, enabling it with a great potential for practical applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yangxin Rong,Yuan Chen,Jihua Zheng,Yan Zhao,Qiuping Li
Herein, a series of alpha-Co(OH) 2 /reduced graphene oxide (rGO) microfilms and film-based nanodevices were developed via a new scalable technique. Due to the unique hexagonal nanoplates of ultrathin alpha-Co(OH) 2 and the intrinsically conductive nature of rGO sheets, such thin films not only can improve the conductivity of alpha-Co(OH) 2 and prevent the re-stacking of alpha-Co(OH) 2 and rGO sheets but also short the transport routes of electrons and ions between the electrode and the electrolyte. The optimized alpha-Co(OH) 2 /rGO flexible electrode presents high specific capacitance (273.86 mF/cm 2 at 0.1 mA/cm 2 ), advanced rate capability, and excellent coulombic efficiency. Simultaneously, in-sandwich symmetric and asymmetric supercapacitors assembled with polyvinyl alcohol-KOH gel as the solid-state electrolyte achieved high areal and volumetric specific capacitances. Furthermore, a self-assembled planar alpha-Co(OH) 2 /rGO micro-supercapacitor (MSC) delivers high specific area capacitance (130F/cm 2 at 0.5 mA/cm 2 ) and excellent energy density (20 mWh/cm 3 @56 mW/cm 3 ), which are superior to most of the recently reported carbon-based and metal hydroxides/oxides/sulfides-based planar MSCs. Also, our planar MSC shows excellent cycling performance, good flexibility, and mechanical stability. This work promotes the syntheses of other two-dimensional metal hydroxides/rGO composite film for high-performance flexible micro-electronics.
✓ 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）