INDUSTRIAL CROPS AND PRODUCTS
·
2024
·
IF 5.6
Jinrong Liang,Kejia Wu,Fukun Li,Jinxing Long,Qiang Zeng,Xuehui Li
Catalytic hydrogenolysis of the renewable aromatic polymer of lignin to value-added fine chemicals without external molecular hydrogen is of great significance. In this work, catalytic conversion of lignin with in situ H 2 produced from the aqueous phase reforming (APR) of methanol is studied in the presence of ZnO-modified Pd/AC (Pd-Zn/AC). 259.8 mg g -1 yield of monophenols is obtained when the lignin depolymerization is catalyzed by Pd-Zn/AC-10 in a methanol aqueous solution ( V C H 3 OH / V H 2 O =9/1) at 250 °C for 4 h. Extensive analysis showed that this effective process should be attributed to the synergistic effect between Pd-Zn alloy and the metallic Pd, which promote the H 2 production from the APR of methanol and the hydrogenolysis of lignin, respectively. Moreover, a plausible pathway for selective hydrogenolysis of lignin is proposed based on the comparative characterization of the raw lignin, residual lignin, and the transformation behavior of lignin model compounds.
研究领域:
化学工程
·
可再生资源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
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2022
·
IF 3.656
Yiyang Bi,Guangqi Wang,Jiabo Wang,Qun Liu,Yu Zhang
Intrinsic charge carrier recombination, narrow visible light absorption and poor durability restrain the photoactivity for solar-to-H 2 production. Here, noble-metal-free binary co-catalyst Ni 2 P–Ni 2 P 4 O 12 was synthesized by a simple one-step thermal phosphorylation method for enhancing CdS nanowires in visible-light-driven hydrogen generation, where the CdS nanowires are uniformly dispersed on the surface of Ni 2 P–Ni 2 P 4 O 12 through in-situ solvothermal strategy. The photocatalytic hydrogen production rate of 5 wt% Ni 2 P–Ni 2 P 4 O 12 /CdS nanowires can reach 5093 μmol g −1 h −1 using Na 2 S–Na 2 SO 3 as sacrificial agent under the irradiation of visible light (λ > 420 nm), which is about 16 times for CdS nanowires (316 μmol g −1 h −1 ). In the cycling experiments, the composite catalyst shows good stability and the hydrogen production rate remains about 83% of the initial value. The interface structure construction between CdS nanowires and Ni 2 P–Ni 2 P 4 O 12 result in the excellent photocatalytic activity , broaded visible light absorption and stability. Specifically, Ni 2 P–Ni 2 P 4 O 12 can effectively promote the separation of electron hole pairs in space, in which Ni 2 P 4 O 12 can accept H + ions and Ni 2 P can reduce the over potential of H + reduction, resulting in the synergically promotion in the photocatalytic activity. The cost-effective ternary photocatalyst exhibits great potential for sustainable and high-efficiency photocatalytic water splitting, and Ni 2 P–Ni 2 P 4 O 12 may be suitable to modify a wider variety of semiconductor photocatalysts.
研究领域:
材料科学
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能源化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
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2021
·
IF 2.991
Bin-Cheng Wang,Xiu-Ping Li,Biao-Biao Hao,Chen-Xi Zhang,Qing-Lun Wang
A coordination polymer with dual functions of high proton conductivity and highly sensitive fluorescent sensors demonstrates a great application potential. In this work, a cadmium-based coordination polymer (denoted as CP 1) with hydrothermal stability was synthesized. The abundant coordination water, lattice water, and amino groups make an extended hydrogen-bonding pathway for efficient proton migration, which endows CP 1 with the highest proton conductivity of 2.41 × 10–3 S·cm–1 at 353 K and 98% RH. Especially, the proton conductivity of the chitosan (CS) hybrid membrane containing CP 1 reaches a maximum value of 2.62 × 10–2 S·cm–1 under 343 K and 98% RH, which increases almost 7 times higher than that of the pure CS membrane due to the host–guest collaboration. Furthermore, luminescence studies revealed that CP 1 is a high-sensitivity and good-selectivity fluorescent probe for the detection of trace amounts of l-histidine with a lowest detection limit of 1.0 × 10–8 M.
研究领域:
材料科学
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化学
·
生物传感
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Jie Luo,Jie You,Shuai Tan,Caihong Wang,Yong Wu
Humidified perfluorosulfonic acid polymers with a nanoscopic phase-separated morphology are highly proton-conductive materials for fuel cells, yet morphology tuning of the acidic materials for enhanced conduction remains a challenge. Aqueous acidic lyotropic liquid crystals (LLCs) provide a powerful platform to construct well-defined nanostructures for proton conduction. We report an aqueous LLC formed by 1-tetradecyl-3-methylimidazolium hydrogen sulfate, exhibiting a proton conductivity of 210 mS cm–1 at 25 °C, which surpasses that formed by alkylsulfonic acid, thus demonstrating that a mobile acidic anion is more efficient than constrained sulfonic acid functionality to transport protons in LLCs. For an aqueous solution of 1-alkyl-3-methylimidazolium hydrogen sulfate, a lamellar LLC results in higher conductivity than a micellar solution under the same hydration conditions. The peak power density of the fuel cell fabricated from porous membranes filled with the lamellar LLC is four times as high as that filled with the micellar solution. The work offers an efficient way to construct highly proton-conductive LLC materials for fuel cell application.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2022
·Vol. 28
·期 71
·e202202410
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IF 5.02
Yong Gao,Dani Zhang,Jingjing Li,Hao Gong,Cheng Jiang,Hairong Xue,Xianli Huang,Tao Wang,Jianping He
Graphical The P doped MoS 2 @Ni 3 S 2 nanorods array with core/shell structure was prepared through successive sulfuration and phosphorization strategies, which exhibits close catalytic activity to Pt/C, the overpotential is only 290 mV at 250 mA cm −2 . Electrocatalysis is the most promising strategy to generate clean energy H 2 , and the development of catalysts with excellent hydrogen evolution reaction (HER) performance at high current density that can resist strong alkaline and acidic electrolyte environment is of great significance for practical industrial application. Therefore, a P doped MoS 2 @Ni 3 S 2 nanorods array (named P-NiMoS) was successfully synthesized through successive sulfuration and phosphorization. P-NiMoS presents a core/shell structure with a heterojunction between MoS 2 (shell) and Ni 3 S 2 (core). Furthermore, the doping of P modulates the electronic structure of the P-NiMoS; the electrons transfer from the t 2g orbital of Ni element to the e g empty orbital of Mo element through the Ni−S−Mo bond at the Ni 3 S 2 and MoS 2 heterojunction, facilitating the hydrogen evolution reaction. As a result, P-NiMoS exhibits excellent HER activity; the overpotential is 290 mV at high current density of 250 mA cm −2 in alkaline electrolyte, which is close to Pt/C (282 mV@250 mA cm −2 ), and P-NiMoS can stably evolve hydrogen for 48 h.
研究领域:
材料科学
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电催化
·
能源化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Penghua Qin,Zhen Wu,Pengyu Li,Dian Niu,Minghua Liu,Meizhen Yin
The construction of chiroptical materials with controllable chirality is of special importance in biology and chemistry. Although tunable chirality can be realized in various systems, it remains a fundamental challenge to realize multimodulated chiral inversion. Herein, we report that chiral alanine derivative and fluorescent cyanostilbene derivative co-assemble to prepare supramolecular chiral systems, where twist nanofibers with totally inverted supramolecular chirality and circularly polarized luminescence are obtained through stoichiometric modulation. The supramolecular handedness can be inverted by means of altering the cooling rate and incorporating metal ions. The mechanism study reveals that the synergistic effect among hydrogen bonds, coordination interactions, and π–π stacking interactions contributes to the chirality inversion. This work establishes an effective strategy to precisely modulate supramolecular chirality in multiple ways, which shows great potential in developing smart chiroptical materials capable of achieving complex functionalities.
研究领域:
化学
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材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Yao Tian,Chunmei Zeng,Shiyu Yang,Yang Luo,Lunhong Ai,Jing Jiang
Development of efficient and economical non-precious metal catalysts for dehydrogenation of ammonia borane is an important way to store and release hydrogen. Vacancy-engineered defective catalysts with modulated electronic structure allow ideal adsorption and dissociation of reactant molecules for the optimized catalytic activity. In this study, we report a facile synthesis of cobalt-defective Co 3 O 4 (V Co -Co 3 O 4 ) nanocatalyst by the calcination of layered cobalt glycerate as a key precursor. The stacked cobalt-oxygen sheets and interlayer bound glycerate anions in a layered structure are favorable for introducing cation vacancy during calcination process. The obtained V co -Co 3 O 4 exhibits outstanding catalytic activity for the hydrolysis of ammonia borane, along with a high hydrogen production rate of 934 mL min −1 g Cat -1 and a low activation energy of 32.65 kJ mol −1 . The catalytic performance of the V Co -Co 3 O 4 catalyst can be well maintained for consecutive five cycles. The current study establishes a new example of cation vacancy strategy to facilitate the hydrolysis of ammonia borane for hydrogen generation.
研究领域:
材料科学
·
催化化学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Sheng Zhao,Jing Xu,Min Mao,Lingjiao Li,Xuanhao Li
A dye-sensitive photocatalytic H 2 evolution reaction (HER) system with photogenerated carrier directed conduction was constructed. The protonated g-C 3 N 4 combines with the sheet-like Co MOF to form a 2D/2D heterojunction via electrostatic self-assembly. The protonated g-C 3 N 4 and 2D Co-MOF directionally adsorb Eosin Y (EY) and triethanolamine (TEOA) molecules through hydrogen bond and complexation to achieve a whole photocatalytic system. The integral structure effectively facilitates the utilization of dye sensitizer and hole sacrificial agent to achieve the effective and stable photocatalytic H 2 evolution capacity. The photocatalytic hydrogen evolution rate of g-C 3 N 4 after protonation is 1.88 times as high as that of the original g-C 3 N 4 . On the basis of 2D/2D heterojunction, Co MOF is doped with rare earth element Sm. The 4f electrons and the difference valences (Sm 3+ and Co 2+ ) further suppress the reorganization of photogenerated excitons to achieve highly efficient photocatalytic HER. The directional coupling of sensitizer and electron sacrificial agent combined with rare earth element doping makes the photocatalytic HER rate of the composite material reached 73.42 μmol . h −1 within 5 h under simulated sunlight.
研究领域:
材料科学
·
光化学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Qilong Zhou,Lisong Dong,Jian Wu,Yijun Shi,Xin Feng,Xiaohua Lu,Jiahua Zhu,Liwen Mu
From one to more, the same raw materials giving rise to multifarious products is one of the goals of researchers to pursue industrial efficiency. Herein, we designed a formula (controlling the content of the matrix) to prepare two functional ionic gels, integrating the excellent lubrication, thermal conductivity, and self-healing ability to meet different industrial demands of the lubrication and biomedical fields. Deep eutectic solvents (DESs) of urea/choline chloride (UCC) and glycerol/choline chloride (GCC) were locked in polyacrylamide (PAM) ionic gel formed by acrylamide (AM) and a photoinitiator by free-radical polymerization. The unique dual hydrogen bond network in the ionic gel causes the material to exhibit a low wear rate, which can effectively reduce the wear of metal contact. With the addition of PAM, the ionic gel has excellent mechanical strength and good recovery performance. Unexpectedly, this dense hydrogen bond network enhances thermal conductivity by optimizing phonon and electron transfer. The versatile ionic gel has a good application prospect as a substitute for industrial lubricants and medical device materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Lihua Qian,Guojun Lan,Xiaoyan Liu,Zhenqing Li,Ying Li
The hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) by using water as solvent is a crucial process in the production of fine chemicals from biomass. An ultrathin carbon layer coating CoRu bimetallic catalyst supported on silica (CoRu@C/SiO 2 ) is prepared by using tannis-ligated cobalt-ruthenium complex on silica as precursors, and applied for catalyzed synthesis of GVL from LA. Because of the synergistic effect between cobalt and ruthenium, the addition of small amounts of Ru to Co catalysts can increase the catalytic activity in the aqueous hydrogenation of LA. The ultrathin carbon layer covered on the CoRu bimetallic catalyst can greatly reduce the leaching of active metals. The CoRu@C/SiO 2 catalyst achieves high stability and is reused up to 5 runs without significant loss of performance in aqueous hydrogenation of levulinic acid.
研究领域:
催化化学
·
生物质能
·
材料科学
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2021
·Vol. 9
·期 2
·e202101580
·
IF 4.59
Yong Jiang,Youcheng Qin,Wei Luo,Hao Liu,Wei Shen,Yimin Jiang,Ming Li,Rongxing He
Graphical Boosting HER stability : The Ru-MC prepared by a special synthesis method can greatly improve the utilization of Ru; the strong interaction between Ru and O modulates the electronic structure of Ru nanoparticles (NP) and prevents Ru NPs from aggregation to boost HER stability. The Ru(3 mL)-MC exhibits high HER performance with overpotential of 27 and 40 mV at benchmark of 10 mA cm −2 both in alkaline and acidic solutions. Crystallized Ruthenium (Ru) metal with high hydrogen production activity is extremely unstable. Herein, we report an efficient and durable hydrogen evolution reaction (HER) electrocatalyst Ru-MC (mesoporous carbon) synthesized by a special method, in which Ru 3+ is added after the formation of spherical MC, leading to only a small amount of Ru being embedded and the vast majority being evenly distributed on the MC surface. The dispersed Ru nanoparticles not only prevent them from aggregation to greatly improve their stability (both over 160 hours in acidic and alkaline solutions), but also provide outstanding intrinsic catalytic activity because oxygen regulates the electronic structure of Ru nanoparticles. The as-synthesized catalyst only needs an overpotential of 27 and 40 mV to deliver 10 mA cm −2 in 1.0 M KOH and 0.5 M H 2 SO 4 . The present work provides guidance for the design of efficient and stable Ru-based HER electrocatalysts used in a wide pH range.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Precision Chemistry
·
2023
·
IF 0
Yating Lv,Hai Wang,Huixin Wu,Qingsong Luo,Liang Wang,Feng-Shou Xiao
Selective hydrogenation over earth-abundant metal catalysts is challenging but particularly valuable for practical applications in heterogeneous catalysis. Herein, we demonstrate that the catalytic selectivity of the commercial Raney nickel catalyst can be greatly tuned by modulation of the nickel surface by silica. Using quinoline hydrogenation as a model, we show that the silica-modified Raney nickel catalysts exhibit good activity, excellent selectivity, and long stability, whereas the undesired overhydrogenation reactions are effectively hindered. In contrast, the pristine Raney nickel catalyst shows inferior selectivity for the targeted product. Mechanistic studies confirm a positive role of silica to facilitate the desorption of 1,2,3,4-tetrahydroquinoline from the catalyst surface, thus enhancing the product selectivity.
研究领域:
物理化学
·
材料科学
·
催化化学
✓ 已验证
DOI
危险品化学品经营许可证（带存储）