INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Haili Gao,Yaqiong Ma,Yunpeng Li,Yang Cao,Zhigang Yin,Hewei Luo,Ji Yan,Yong Zhang
During recent years, increasing demand of new, clean, and renewable energy resources has stimulated wide study on exploitation of non-platinum-group cathode catalysts for oxygen reduction reaction (ORR). Here, a series of nitrogen-doped carbon coated Co nanoparticle supported on reduced graphene oxide (Co@NC/RGO) were prepared by growth of ZIF-67 on GO with subsequent carbonation. The influence of incorporating dose of GO on the catalyst structure and activity was studied. The phase structure, morphology, element distribution, element composition, specific surface area, and pore-size distribution were characterized by various characterization techniques. The highest catalytic performance is achieved when the adding proportion of GO is 2.6% with the onset potential of 0.96 V and half-wave potential of 0.82 V. The introduction of RGO not only improves the electronic conductivity but also accelerates charge transfer. The special porous structure makes it have high specific surface area (313.7 m 2 g −1 ) and large pore size (12.6 nm). The contents of pyridinic-N (53.4%) and graphitic-N (19.3%) in Co@NC/RGO-2.6 are higher than those in Co@NC (50.2% and 10.3%). Co@NC/RGO-2.6 exhibits much higher durability than commercial Pt/C. The ORR mechanism on the home-made catalyst is similar to that on Pt/C.
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 11
·5749-5759
·
IF 2.936
Pingfan Xu,Siyi Huang,Yuancai Lv,Yi Chen,Minghua Liu,Haojun Fan
To solve the problem of contamination of hexavalent chromium (Cr(VI)), visible-light-driven graphene-based ternary metal chalcogenide nanosheets (rGO/SnIn4S8) were synthesized via a one-pot surfactant-assisted hydrothermal method for the photoreduction of Cr(VI). Characterizations demonstrated that SnIn4S8 nanosheets were uniformly distributed on the surface of rGO and the as-synthesized nanosheets exhibited excellent photocatalytic activity under visible light. In addition, the effects of pH, concentration of critic acid, holes and electron scavengers on the reduction of Cr(VI) were systematically investigated. It was found that 50 mg L−1 of Cr(VI) could be completely removed within 30 min at pH 2 when citric acid served as a hole scavenger. Kinetic studies showed that the photocatalytic reduction of Cr(VI) processes obeyed the pseudo first order model. Further study indicated that the Cr(III) species was immediately adsorbed onto the surface of the rGO/SnIn4S8 nanosheets after photocatalytic reduction of Cr(VI). Additionally, recycling results suggested that rGO/SnIn4S8 nanosheets possessed high recycle ability and stability after repeated use (5 times). This effective and promising work might provide a new strategy for the photoreduction of Cr(VI) and complete removal of chromium from effluent through the novel photocatalyst rGO/SnIn4S8.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Zhouyu Tong,Yuxin Bi,Mingliang Ma,Zijian Liao,Weibo Huang,Kwok L. Chung,Yong Ma,Guanglei Wu,Yulong Qu,Chengbo Pan,Yusheng Wang
Novel composite microwave absorption (MA) materials with multiple loss mechanism have attracted considerable attention. In this work, flower-like surface Ni@Co 3 O 4 nanowires were designed and fabricated through chemical reduction method induced by magnetic field, followed by in-situ polymerization, low temperature oil bath and thermal annealing. Then, the Ni@Co 3 O 4 /RGO composites were prepared through a hydrothermal reaction of the Ni@Co 3 O 4 nanowires and graphene oxide suspension. The electromagnetic properties of different loading content samples (15 wt%, 25 wt% and 35 wt%) were measured to investigate the influence of loading content on the MA performance. For the 35 wt% loading sample, the minimum reflection loss (RL min ) value of −60.0 dB was determined at the thickness of 2.3 mm, and the maximum effective absorption bandwidth (EAB, RL < −10 dB) of 4.62 GHz can be achieved when the thickness is 1.6 mm. This research provides a reference for exploiting high-efficient flower-like surface magnetic-dielectric composites in the field of MA.
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Rong Zhao,Mengya Yang,Huan Wang,Tian-Nan Ye,Yi Liu,Dongming Yan
Developing non-noble metal catalysts with low price, functional activity, and robust stability for hydrogen evolution reaction (HER) is greatly desirable. Herein, we report Ni x Co 1-x P nanoparticles anchoring reduced graphene oxide (Ni x Co 1-x P/rGO) fabricated from metal-organic frameworks precursors via a facile phosphorization reaction under N 2 atmosphere. The as-prepared Ni x Co 1-x P/rGO catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), field-emission transmission electron microscopy (FE-TEM), X-ray photoelectron spectroscopy (XPS) and N 2 adsorption-desorption isotherm. In particular, the optimized Ni 0.14 Co 0.86 P/rGO composite shows a good performance towards HER electrocatalysis with a low overpotential of 181 mV at a current density of 10 mA cm −2 and Tafel slope of 65 mV dec −1 , benefiting from the synergistic effect of both Ni doping and rGO incorporation. Such collaborative interplay can significantly tune electronic conductivity and thereby promote the HER process. This simple fabrication process of Ni x Co 1-x P/rGO catalysts is expected to offer useful guidelines for exploring excellent HER catalysts.
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Qiaoqiao Mu,Wei Zhu,Xian Li,Chufeng Zhang,Yanhui Su,Yuebin Lian,Pengwei Qi,Zhao Deng,Duo Zhang,Shuao Wang,Xing Zhu,Yang Peng
In this work, composite thin films comprising the 2D/2D MOF/rGO heterostructures assembled via Coulomb interaction are employed as the cocatalyst for photocatalytic CO 2 reduction for the first time. The electrostatic charge transfer and the strong π-π interaction induced in the heterostructure effectively modulate the electronic structure of the metal centers in the conductive 2D MOF (Ni 3 HITP 2 ), evidenced by Zeta Potentials, HR-TEM, XPS and XANES. The best thin-film catalyst with an optimal MOF/rGO ratio demonstrates a high CO evolution rate of 3.8 × 10 4 μmol h −1 g film −1 (0.46 min −1 in TOF) and a good selectivity of 91.74%, synergically contributed by the improved photoelectron harvesting on the rGO scaffold, the efficient charge transportation/transfer within the conductive and intimate 2D heterostructure, the coherent energy flow owing to aligned energy levels, and the enriched electron density at the isolated Ni-N 4 sites boosted by electrostatic charge transfer.
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Na Ye,Zhao Jiang,Tao Fang
Direct methanol fuel cells (DMFCs) have attracted extensive attention due to clean, efficient characteristics and portable applications. In this work, a series of Pd x Cu y /reduced graphene oxide (rGO) catalysts are assembled and the catalytic performances are investigated for methanol oxidation reaction (MOR) in alkaline media. The intrinsic surface electronic structures of the Pd x Cu y /rGO bimetallic catalysts are also studied to clarify the reaction mechanism. The results reveal that Pd 1.2 Cu 0.2 /rGO exhibits superior catalytic activity (1101.58 A g Pd −1 ), 4.2 and 5.2 times higher than those of the commercial PtRu/C and Pd/C catalysts. CO stripping suggests that the onset potential for CO oxidation on the Pd 1.2 Cu 0.2 /rGO catalyst is lower than those on the commercial PtRu/C and Pd/C catalysts, implying that the anti-CO poisoning ability is enhanced. Combined with the analysis of X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and Raman, the enhanced catalytic activity and anti-CO poisoning ability are attributed to the charge transfer and lattice compression between Pd and Cu, which modify the d-band center and weaken the adsorption of CO. Furthermore, a volcano plot is found between the MOR activity and d-band center, indicating that the excellent MOR activity is attributed to the optimal d-band center with the moderate adsorption strength of CO-like intermediates.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chenghong Sun,Enze Zhu,Chaoyang Shi,Juan Yu,Shubiao Yin,Chunxia Liu,Xiaoying Cui,Weiping Liu,Mingli Xu
The vigorous development of efficient cathode-side oxygen reduction reaction (ORR) catalysts is one of the keys to the practical application of fuel cells and Zn-air batteries (ZABs). Herein, a facile and green photochemical method is developed to synthesize pure-phase Mn 3 O 4 nanoparticles , which are uniformly anchored on nitrogen-doped reduced graphene oxide (N-rGO), followed by simple one-step annealing to highly catalytical active and stable MnO/N-rGO. The resultant MnO/N-rGO exhibits exciting ORR performance in alkaline media. Particularly, both GDE (gas diffusion electrode) half-cell and ZABs assembled from MnO/N-rGO have excellent overall performance and outstanding long-term durability, obviously better than Pt/C-based GDE half-cell and Pt/C + RuO 2 -based ZABs, respectively. It is mainly attributed to the synergistic effect between MnO nanoparticles and N-rGO support, which significantly increases the active sites and facilitates 4-electron transfer. This research paves a way for the green photochemical synthesis of transition metal oxide ORR catalysts at room temperature.
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yang Bai,Yufei Yuan,Yu Yang,Changli Lü
Introducing more ionic conductive groups in polymer-based anion exchange membranes (AEMs) can improve the ion exchange capacity and further overcome the disadvantage of low ion conductivity for AEMs. However, the excessive swelling of AEMs caused by exorbitant IEC value may reduce the dimensional stability of membranes. So it is extremely important to modify the structures of AEMs. Herein, we proposed a facile strategy to construct reduced graphene oxide (rGO) stable crosslinked polysulfone-based AEMs with improved properties. rGO was non-covalently modified with pyrene-containing tertiary amine small molecule and polymer via π-π interactions. The as-prepared functionalized rGO (TrGO and PrGO) as both cross-linkers and fillers to fabricate quaternized polysulfone (QPSU)-based AEMs (CQPSU-X-TrGO and CQPSU-X-PrGO) for the first time. The cross-linked membranes can tighten the internal packing structure, and enhance the alkaline resistance, ion conductivity and oxidative stability of AEMs. Furthermore, the hydrophilicity and flexibility of the CQPSU-X-PrGO membranes were significantly improved as compared with that of CQPSU-X-TrGO membranes. PrGO-crosslinked membranes (CQPSU-2%-PrGO, σ OH − = 117.7 mS/cm) displayed higher ionic conductivities at 80 °C than TrGO-crosslinked membranes (CQPSU-1%-TrGO, σ OH − = 87.2 mS/cm). The remarkable nanophase separation can be observed in the CQPSU-X-PrGO membranes by TEM. This feasible strategy can be efficiently used to prepare new type of crosslinked organic-inorganic nanohybrid AEMs with excellent chemical stability and high ionic conductivity.
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Fan Jin,Dawu Lv,Wenfeng Shen,Weijie Song,Ruiqin Tan
Intelligent flexible strain sensors based on fabric have caused tremendous attention in the application of wearable devices because of their lightweight and excellent air permeability . It is still a great challenge to achieve excellent stability, high sensitivity, and wide working range. In this work, a high-performance strain sensor with reduced graphene oxide (rGO) reinforced polyaniline (PANI) based on polydopamine (PDA) modified Lycra cotton (LC) electronic textile (e-textile) was fabricated. The strain sensor of PANI/rGO/PDA/LC exhibits high sensitivity with a gauge factor (GF) of 24, a wide strain range of 0.2–50%, and excellent mechanical durability and stability for 1500 stretching/releasing cycles test. Such e-textile is promising to be integrated with other wearable devices to track human motion signals in real-time for human-machine and medical monitoring.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Lei Gao,Ruirui Yue,Jingkun Xu,Zhen Liu,Jingdang Chai
In this paper, Pt-PEDOT/reduced graphene oxide (Pt-PEDOT/rGO) nanocomposites were facilely prepared by a simple and cost-effective one-pot method. The obtained nanocomposites were characterized and confirmed by scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and Raman spectra . As expected, the Pt-PEDOT/rGO nanocomposites modified glassy carbon electrode (Pt-PEDOT/rGO/GCE) exhibited higher charge transfer efficiency and electrocatalytic activity to the oxidation of caffeic acid (CA) in comparison with the bare GCE, rGO and Pt-PEDOT modified electrodes (rGO/GCE and Pt-PEDOT/GCE). Furthermore, the Pt-PEDOT/rGO/GCE showed a wide linear range of 5.0 × 10 −9 to 5.0 × 10 −5 M with a low detection limit of 2.0 × 10 −9 M (S/N = 3) for the determination of CA. More experiments indicated that the Pt-PEDOT/rGO/GCE performed superior reproducibility, selectivity and long-term stability. Finally, the modified electrode was also applied to detect CA in green tea and black tea samples with promising recovery and application prospect.
✓ 已验证
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Mingming Chang,Ruiru Yang,Xiaojing Lai,Xinzhi Wang,Jing Jiang
Solar-driven water evaporation for sustainable freshwater production is an efficient and economical solution to alleviate global water shortages. However, available solar evaporators still face efficiency and durability limitations. Herein, this challenge is overcome via the ingenious design of a three-dimensional (3D) monolithic porous architecture based on the reduced graphene oxide (rGO) and layered molybdenum boride (MBene). Benefiting from broad light absorption, efficient water activation and porous architecture feature, the rGO-MBene acquires an impressive rate of ~2.79 kg·m −2 ·h −1 to steam pure water under one-sun (1 kW/m 2 ), which is superior to most of state-of-the-art graphene-based evaporators reported so far. When applied to solar desalination, the rGO-MBene exhibits highly durable desalination capability with a salt-free evaporation surface. After continuous irradiation in a 3.5 % NaCl solution for 100 h, an almost constant evaporation rate of approximately 2.34 kg·m −2 ·h −1 can be maintained. Meanwhile, the rGO-MBene evaporator also demonstrates its robustness for effective production of freshwater from various wastewater sources. This work not only establishes an attractive example of rGO-hybridized architecture to achieve highly efficient solar evaporation for long-lasting salt-resistant desalination and multitasking water purification , but also provides exciting opportunities to design new MBene-based materials with the improved photothermal performance for sustainable solar conversion.
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2025
·
IF 3.5
Guoxin Ding,Xiangxiang Chen,Yuexiang Hu,Yan Liu,Jun Liu,Guojun Cheng
The design of the material structure significantly influences microwave absorption properties. Enhancing electromagnetic performance requires the creation of diverse and heterogeneous interfaces to promote extensive wave reflections. This study developed 3D composites with point (NiFe-LDH), line (multi-walled carbon nanotubes, MWCNTs), and surface (reduced graphene oxide, RGO) architectures using ultrasonic stirring and a hydrothermal process, aiming to achieve improved electromagnetic properties. At a Ni:Fe ratio of 3:1, MWCNTs are interspersed within the layers of reduced RGO, forming a distinctive three-dimensional network structure. Additionally, on the MWCNTs/RGO composite's surface, NiFe-LDH flakes grow uniformly. The resulting composite exhibits an effective absorption bandwidth (EAB) of 5.2 GHz and a minimum reflection loss (RL min ) of −57.93 dB at a thickness of 1.64 mm. Furthermore, a thickness of 1.70 mm achieves a maximum EAB of 6.88 GHz. These results demonstrate that the MWCNTs/RGO/NiFe-LDH composite provides a broad microwave absorption bandwidth and high absorption efficiency, making it a promising candidate for developing advanced materials for microwave absorption applications.
✓ 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）