JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Ruisen Jing,Junshan Yang,Shutao Li,Shifeng Zhao,Pengfei Wang,Yunyan Liu,Aiju Liu,Zilin Meng,Hongwei Huang,Zhilei Zhang,Qian Zhang
The use of black phosphorus (BP) nanosheets has attracted much attention in the area of photocatalysis owing to the thickness-tunable bandgap and high carrier mobility. In order to improve the stability of BP nanosheets, poly dimethyldiallyl ammonium chloride (PDDA) is used to passivate the BP nanosheets and change its surface properties. The present study concerns the development of a facile electrostatic assembly method for the construction of a Z-scheme system consisting of PDDA-functionalized BP nanosheets and layered BiOI in order to enhance visible light adsorption and promote electron-hole separation. The morphology, structure and photoelectrochemical properties of the composites are thoroughly characterized and the photocatalytic performances of all the samples were assessed under visible light irradiation. The 5-F-BP/BiOI exhibits excellent photocatalytic activity with removal efficiencies of 97.6% and 90.0% for methylene blue (MB) and tetracycline (TC), respectively. Superoxide radicals (·O 2 – ) were found to be the main organic decomposition products according to species trapping experiments. The photocatalyst presents favorable stability after three catalytic cycles. This study provides new insights into the design of highly efficient Z-scheme photocatalysts based on functionalized BP nanosheets in order to meet environmental demands.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Shu Xu,Shuaiqi Gong,Hua Jiang,Penghui Shi,Jinchen Fan,QunJie Xu,YuLin Min
In this paper, we have designed the composite material of black phosphorus/tungsten nitride (BP/WN) with near-infrared light (NIR light) response as a noble-metal free photocatalyst for the first time. Modification of bulk BP by ball milling can control the band gap of the composite material to achieve efficient photocatalytic hydrogen evolution in the near-infrared region. At wider than 420 nm, and with illumination wider than 700 nm, a certain amount of hydrogen can be produced without any hole quencher. The rate of photocatalytic hydrogen evolution from pure water reaches 10.77 μmolg −1 h −1 under NIR light without any cocatalyst. The presence of a Z-type heterojunction effectively separates photogenerated carriers and prolongs the lifetime of photogenerated carriers, thereby enhancing the photocatalytic performance. The results indicate that BP/WN photocatalysts can provide a new approach to artificial photosynthesis and renewable energy conversion.
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Journal of Physical Chemistry C
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2021
·
IF 4.126
Qian Zhang,Jian Weng,Jun Xu
Electrocatalytic performance for the ethanol oxidation reaction (EOR) under alkaline conditions can be improved by the rational design of catalysts. Palladium phosphates have shown higher electrical conductivities and activity compared with Pd. Nevertheless, the synthesis of palladium phosphide is complex and requires a relatively high temperature. Here, we report a simple synthesis method of palladium phosphide/black phosphorus heterostructure (Pd3P/BP) with enhanced EOR activity. BP is used instead of other phosphorus sources for several reasons: (i) BP has a lone pair of electrons, which easily coordinate with the metal atoms to form palladium phosphides. (ii) As a two-dimensional layered structure material, BP has a large specific surface area, which is beneficial for the dispersion of metal nanoparticles, and thus improves the utilization rate of catalysts owing to the expanded active sites. (iii) Phosphorus species (P0) might inhibit the adsorption of CO on the catalyst surface. (iv) BP has an excellent adsorption capacity to water molecules, thereby promoting the generation of OH groups and stripping of reaction intermediates, contributing to superior EOR activity and stability of Pd3P/BP. The activity of Pd3P/BP (7411.2 mA mgPd–1) is about 9.1-fold higher than the commercial Pd/C (814.8 mA mgPd–1) and significantly higher than that of Pd3P + BP (3065.4 mA mgPd–1).
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2021
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IF 6.953
Qiong Wu,Fangli Ran,Lin Dai,Chenyu Li,Ruifang Li,Chuanling Si
Lignin-based flame retardants represent great promising next-generation flame retardants due to their sustainability, unique aromatic structure, and high charring capability. However, their applications are still limited by the compatibility, processability, and efficiency of flame retardancy. Here, a green functional lignin-based nanofiller (lignin-diethylenetriamine/red phosphorus nanoparticles, Lignin-N-P NPs) was prepared by the chemical modification and co-precipitation. After blending with the commercial acrylonitrile butadiene styrene copolymers (ABS), the physical, chemical, and flame retardant properties of the blends reveal that Lignin-N-P NPs/ABS blend has acceptable processability, mechanical properties, and significantly improved thermal stability and fire performance. Its values of peak heat release rate and total heat released per unit area were significantly dropped 67.8% and 77.5%, respectively. This study will initiate a new design for not only flame retardants but also lignin-based materials.
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Lubrication Science
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2021
·Vol. 33
·期 7
·404-416
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IF 1.985
Wei Wang,Shaowen Dong,Yuan Gao,Guoliang Zhang,Kuaishe Wang
In this investigation, a self-assembly method was used to fabricate black phosphorus (BP)/MoS 2 composites as water-based lubrication additives. The tribological behaviours of the lubrication additives for GCr15 steel ball/TC4 titanium alloy disk contact under different mass ratios, loads and rotational speeds were also investigated. The experimental results showed that 0.01 wt.% BP and 0.04 wt.% MoS 2 as water-based lubrication additive have the best the synergistic lubrication effect. Compared with pure water, coefficient of friction (COF) and wear rate of the lubrication additive at the test conditions of 8 N and 150 r/min were reduced by 32.6% and 68.8%, respectively. As the loads increased, the COFs and wear rates of all the lubricants including pure water, BP as water-based lubrication additive (BP-WL), MoS 2 as water-based lubrication additive (MS-WL) and BP/MoS 2 composites as water-based lubrication additive (BM-WL) were all reduced. As the rational speeds increased from 100 to 250 r/min, all the lubricants were firstly decreased and then increased. Based on tribological tests and wear surface analysis, the lubrication mechanism of BM-WL is proposed. The interlaminar shear and the adsorption of BP/MoS 2 composites on the wear surface of the friction pairs are the key to reducing COFs sand wear rates. In addition, the tribo-chemical reaction films consists of FeO/Fe 2 O 3 , Al 2 O 3 and TiO 2 were formed during the friction process, which can effectively protect the surface of the titanium alloy/steel contact from wear.
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Nanoscale Advances
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2021
·Vol. 3
·期 19
·5650-5655
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IF 4.553
Xingyun Li,Bin Han,Yaojie Xu,Xiao Liu,Chunhui Zhao,Jun Xu
As an advanced two-dimensional (2D) material with unique properties, black phosphorus (BP) has attracted great attention in a variety of fields. One of the main obstacles for the practical application of BP is the poor ambient stability of few-layer BP, especially under light irradiation. In this study, a light-absorbing conjugated polymer is functionalized on the surface of BP during the exfoliation process, yielding BP nanosheets with light-resistance. The obtained BP/polymer nanosheets demonstrate enhanced stability compared to pure BP under sunlight. Systematic characterization reveals that the crystal structure and electronic characteristics of BP are well retained after 30 days of sun exposure. This convenient and efficient conjugated polymer passivation provides a novel light-prohibited method to improve the stability of BP for future applications.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Man Guo,Meijiao Xu,Yuan Qu,Chuan Hu,Puxuan Yan,Tayirjan Taylor Isimjan,Xiulin Yang
Developing high-efficient non-noble metal-based catalysts for oxygen reduction reaction (ORR) is an inevitable way to improve Zinc-air batteries' performance (ZAB). Herein, we report a Cu 3 P/MoP electrocatalyst (Cu 3 P/MoP@C) supported by hollow-porous-carbon nanospheres displaying high electrocatalytic activity and exceptional durability in alkaline media. The optimized ORR catalyst outperformed the benchmark Pt/C (20 wt%) and most recently reported Cu-/Mo-based catalysts in various aspects. X-ray photoelectron spectroscopy reveals that the excellent ORR performance originates from the charge transfer between of Cu 3 P and MoP species. Besides, the large specific surface area of Cu 3 P/MoP@C with mesoporous structure is particularly advantageous for the inner surface contact with electrolyte to accelerate ORR kinetics. Moreover, Cu 3 P/MoP@C also exhibits a large power density of 156 mW cm −2 , a high round-trip efficiency, and superb stability over 231 h superior to Pt/C in the ZAB. This work offers a scalable and promising approach for the rational fabrication of hollow porous structure materials.
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Polymers
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2021
·Vol. 13
·期 21
·3635
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IF 4.329
Shaoling Lin,Boqing Tao,Xiaomin Zhao,Guohua Chen,De-Yi Wang
Recently, lots of effort has been placed into stabilizing black phosphorus (BP) in the air to improve its compatibility with polymers. Herein, BP was chemically functionalized by aliphatic amine (DETA), aromatic amine (PPDA) and cyclamine (Pid) via a nucleophilic substitution reaction, aiming to develop an intensively reactive BP flame retardant for epoxy resin (EP). The -NH2group on BP-DETA, BP-PPDA and BP-Pid reacted with the epoxide group at different temperatures. The lowest temperature was about 150 °C for BP-DETA. The impacts of three BP-NH2were compared on the flame retardancy and thermal decomposition of EP. At 5 wt% loading, EP/BP-NH2all passed UL 94 V 0 rating. The limiting oxygen index (LOI) of EP/BP-PPDA was as high as 32.3%. The heat release rate (HRR) of EP/BP-DETA greatly decreased by 46% and char residue increased by 73.8%, whereas HRR of EP/BP-Pid decreased by 11.5% and char residue increased by 50.8%, compared with EP. Average effective heat of combustion (av-EHC) of EP/BP-Pid was lower than that of EP/BP-DETA and EP/BP-PPDA. In view of the flame-retardant mechanism, BP nanosheets functionalized with aliphatic amine and aromatic amine played a dominant role in the condensed phase, while BP functionalized with cyclamine was more effective in the gas phase.Keywords:black phosphorus;functionalization;flame retardancy;epoxy resin
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JOURNAL OF HAZARDOUS MATERIALS
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2019
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IF 7.65
Wei Cai,Tongmin Cai,Lingxin He,Fukai Chu,Xiaowei Mu,Longfei Han,Yuan Hu,Bibo Wang,Weizhao Hu
Herein, as a natural antioxidant, tannin (TA) is firstly used to functionalize black phosphorous (BP) nanosheets to improve the ambient stability and toxic suppression, thus decreasing the fire hazards of polymer materials. Compared to pure BP nanosheets, higher temperature for thermal oxidation decomposition is achieved for TA-BP nanosheets, directly confirming the ambient stability of TA-BP nanosheets. Meanwhile, from high resolution TEM and XPS results, TA-BP nanosheets after being exposed at air for 10 days present well-organized crystal structure and low PO x bonds content. Cone calorimeter results illustrate that the incorporation of 2.0 wt% TA-BP nanosheets significantly decreases the peak value of heat release rate (−56.5 %), total heat release (−43.0 %), CO 2 concentration (−57.3 %) of TPU composite. Meanwhile, with addition of low to 1.5 wt%, the release of highly-toxic CO gas is significantly suppressed, confirmed by lower peak value (0.52 mg/m 3 ) and decreased total release amount (−55.1 %). The obviously enlarged tensile strength (36.7 MPa) and desirable elongation at break (622 %) are also observed. This strategy not only firstly adopts bio-based antioxidant to impart excellent environmental stability for BP nanosheets, but also promotes the promising potentials of BP nanosheets in the fire safety application of polymer composites.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Wei Cai,Yixin Hu,Ying Pan,Xia Zhou,Fukai Chu,Longfei Han,Xiaowei Mu,Zeyuan Zhuang,Xin Wang,Weiyi Xing
As one of emerging layered nanomaterials, the potential of black phosphorous nanosheets (BP) for fabricating high performance polymer composites was seriously confined by incompatible interface. Herein, interfacial engineering between BP nanosheets and polyurethane (PU) matrix was rationally designed, where employing polymerized ionic liquid as linking bridge between robust BP nanosheets and soft TPU. The ionic liquid (IL) was firstly confined onto the surface of BP nanosheets with the combination of electrostatic-driving self-assembly process and in situ radical polymerization was then performed. The successful preparation of IL-functionalized BP (IL-BP) nanosheets was confirmed by a series of analytic methods, incluing TEM, XPS, FTIR, and so on. The resultant IL-BP nanosheets imparted well mechanical performance and flame retardancy to TPU composites. Compared to the mechanical enhancement reported by other literatures, the break strength of TPU/IL-BP-1.0 was significantly increased by 50%, attributing to strong interfacial regulation of polymerized IL and mechanically robust BP nanosheets, generated by the similar polarity. Meanwhile, significant decreases of 38.2% and 19.7% in peak values of heat release rate and total heat release were achieved for TPU/IL-BP-2.0. With the investigation of combustion residue and pyrolysis products, it was found that a mass of pyrolysis products reacted with IL-BP nanosheets to form mechanically robust protective char and solid products, being no longer used as fuel to support combustion. Meanwhile, the maximum concentration of CO 2 and highly toxic CO of TPU/IL-BP-2.0 were effectively decreased by 36.9% and 26.5%, compared to the pure TPU. Such a design route effectively regulates the interfacial interaction between BP nanosheets and polymer matrix and offers a practical route for preparing high performance materials.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Tong Wu,Yu Ma,Zhibei Qu,Jinchen Fan,Qiaoxia Li,Penghui Shi,Qunjie Xu,Yulin Min
Rational design supporting material for palladium (Pd)-based catalyst can maximize its electrocatalytic performance for ethanol oxidation reaction (EOR) catalyst in alkaline condition. Utilizing the unique two-dimensional structures and outstanding physicochemical property of graphene and black phosphorus (BP), herein, we proposed and designed a black phosphorus–graphene heterostructure for supporting Pd nanoparticles. Through merely ball-milling of activated graphene (AG) and black phosphorus (BP), the AG–BP hybrid with a linkage of P–C bonding is used as supports of Pd. The obtained Pd/AG–BP hybrid exhibits ultrahigh electrochemical activity toward EOR. Remarkably, it can achieve a high mass peak current density of ∼6004.53 and ∼712.03 mA mgPd–1 before and after the durability tests of 20 000s on EOR, which are ∼7.19 and 80 times higher than those of commercial Pd/C. The experimental analysis and density-functional-theory calculation show that Pd becomes more positive with electrons transfer from Pd to AG–BP supports and is liable to absorb the OH radicals for removing COads intermediate to release active sites on EOR, together with the excellent ability to generate additional OH militants after combining with the AG–BP heterostructure.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Yu Zhang,Tingting Wang,Yong Wang,Yuanqi Wang,Liqian Wu,Yuan Sun,Xuan Zhou,Wentao Hou,Youwei Du,Wei Zhong
Hollow nano-/micromaterials with tunable shell architectures and compositions are becoming increasingly important and attractive for electrochemical energy conversion and storage. Here, we report carbon-incorporated mixed anionic nickel phosphorus-selenium (Ni 0.85 Se|P) hollow yolk-shell microspheres synthesized by simultaneous selenization and phosphatization of Ni-based metal organic framework (Ni-MOF). Our experimental results indicated that P-doping reduces the synthesis temperature of the system and enhances the crystallinity of Ni 0.85 Se. As a result, this unique structure (Ni 0.85 Se|P) with better crystallinity and higher Ni 2+ /Ni 3+ ratio shows outstanding specific capacity of 506 C g −1 at 1 A g −1 . And the assembled Ni 0.85 Se|P//AC hybrid supercapacitor shows high power density of 20.7 Wh kg −1 at energy density of 798.7 W kg −1 . Meanwhile, Ni 0.85 Se|P exhibits smaller Tafel slope of 90 mV dec −1 and lower onset overpotential of 179 mV versus reversible hydrogen electrode (RHE) for hydrogen evolution reaction (HER) than that of NiP 2 and Ni 0.85 Se, which demonstrates the modulated electronic structure of Ni 0.85 Se|P. Our study will provide a new strategy for combining P-doped induced high crystallinity mixed anion transition metal complexes with MOF of hollow structures for energy storage device and HER.
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