Journal of Energy Chemistry
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2022
·
IF 13.599
Xu Zou,Wei Zhang,Xinyan Zhou,Kexin Song,Xin Ge,Weitao Zheng
Oxygen evolution reaction (OER) is a bottleneck half-reaction in many important energy conversion processes ( e.g. , water splitting), and one of the key issues lies to develop high-efficiency, cost-effective OER electrocatalysts. Rather than those popular extrinsic modulations of any catalysts with gradually degraded performance, we aim at the utilization of the intermediates offered from the undergoing OER as long-standing electrocatalysts. Herein, by inverted design, we extracted the bimetallic borides (FeCoB 2 )-derived intermediates metal borates in the OER, unlocking their potential as a self-functionalized highly active catalytic phase in-situ formed on the metal boride surface for continuing OER operation. Mechanistically, the surface metal atoms are oxidized to oxyhydroxides, and the surface metalloids (B) are further transformed to the corresponding oxoanions to form metal borates. Such OER self-produced electrocatalyst exhibits a small overpotential of 295 mV at 10 mA/cm 2 and its high catalytic activity lasts even after 200 h. Compared with FeCoB 2 , the catalytic activity of this electrochemically activated FeCoB 2 is ∼7 times higher. The in-situ formed metal borate is dominatingly responsible for the obtained high catalytic activity. Such unique OER-produced self-functionalization surfaces of metal borates afford to greatly reduce the energy barrier of the continuing OER, thereby accelerating the reaction process.
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COMPOSITES PART B-ENGINEERING
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2022
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IF 11.322
Fucheng Wang,Jinfeng Zhang,Kaixin Sun,Liwei Quan,Jing Wang,Naiqin Zhao,Chunsheng Shi,Shijian Zheng
Interfacial bonding is an important factor affecting the mechanical properties of composites. The interface between the in-situ synthesized ceramic phase and the metal matrix is considered ideal, so little attention is paid to the interfacial modification. In this work, we found that interfacial segregation affects the growth of the MgAlB 4 whisker and the interface of reinforcement and matrix in the composites. Systematic experiments and theoretical calculations indicate Fe solute prefer to segregate at the MgAlB 4 - { 10 1 ‾ 0 } /Al interfaces in in-situ synthesized MgAlB 4 /Al composites, which is helpful to reduce system free energy. On the one hand, Fe segregation induces the whisker coarsening and the formation of planar defects with a sandwich structure formed by a layer of Fe atoms and two layers of Al atoms in coarse-whiskers, on the other hand, it improves the interfacial strength . Although extra Fe aggravates the whisker coarsening, the synergistic reinforcing effect of the whiskers and the extra Fe is greater than the sum of their individual reinforcing effects. This work demonstrates that interfacial segregation can be used to modulate the size of reinforcements and improve interfacial strength.
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NANOTECHNOLOGY
·
2022
·Vol. 33
·期 50
·505601
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IF 3.953
Xinchao Liang,Jinqian Hao,Pengyu Zhang,Chuang Hou,Guoan Tai
Borophene has attracted extensive interests owing to its distinct structural, electronic and optical properties for promising potential applications. However, the structural instability and need of metal substrate for deposition of borophene seriously restrict the exploration of its exceptional physical and chemical properties and further hamper its extensive applications towards high-performance electronic and optoelectronic devices. Here, we reported the synthesis of high-quality freestanding α-rhombohedral borophene nanosheets by a facile probe ultrasonic approach in different organic solvents. The results show that the nanosheets have high-quality in ethanol solution and have an average lateral size of 0.54 μm and a thickness of around 1.2 nm. Photoluminescence spectra indicate that a strong quantum confinement effect occurs in the nanosheets, which caused the increase of the band gap from 1.80 eV for boron powders and 2.52 eV for the nanosheets s. A nonvolatile memory device based on the nanosheets mixed with polyvinylpyrrolidone was fabricated, which exhibited a good rewriteable nonvolatile memory behavior and good stability.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2021
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IF 3.871
Wenqiang Wang,Fang Peng,Hao Liang,Shixue Guan,Wenjia Liang,Lu Zhang,Mengyang Huang,Yue Tang,Duanwei He
As a highly controversial candidate superhard material, tungsten tetraboride (WB 4 ) has attracted widespread attention due to its desirable mechanical properties . Here, single phase WB 4 ceramics and WB 4 -based materials containing tantalum (Ta) have been successfully synthesized by a high-pressure reaction at 5.0 GPa and 1400 °C - 3000 °C. We systematically investigated the effect of processing temperature on the phase stability of WB 4 and doping with different amounts of Ta on mechanical properties and thermal stability. The results confirm that increasing treatment temperature is beneficial to the synthesis of the WB 4 phase, and high pressure can effectively inhibit the decomposition of WB 4 . Additionally, the hardness value of the WB 4 -based ceramic is found to decrease with the increase of the doped tantalum content. However, the hardness of WB 4 is less than W 0.9 Ta 0.1 B 4 (10 at. % Ta), indicating that a small amount of Ta doping is positive for the mechanical properties of WB 4 . The results show that the W 0.9 Ta 0.1 B 4 ceramic synthesized at a temperature of 2800 °C and 5.0 GPa has excellent overall properties. Its Vickers hardness is 42 GPa (0.49 N), and its oxidation resistance temperature is 542 °C, which is much higher than the hardness and thermal stability of tungsten carbide (WC). This work can provide practical guide for the design of new transition metal boride superhard materials, and point out the visual direction for exploring the next generation of superhard materials.
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WATER RESEARCH
·
2021
·
IF 11.236
Chenying Zhou,Peng Zhou,Minglu Sun,Yang Liu,Heng Zhang,Zhaokun Xiong,Juan Liang,Xiaoguang Duan,Bo Lai
The sluggish kinetics of Fe(II) recovery strongly impedes the scientific progress of Fenton reaction (Fe(II)/H 2 O 2 ) towards practical application. Here, we propose a novel mechanism that metal-free nitrogen-doped carbon nanotubes (NCNT) can enhance Fenton chemistry with H 2 O 2 as electron donors by elevating the oxidation potential of Fe(III). NCNT remarkably promotes the circulation of Fe(III)/Fe(II) to produce hydroxyl radical ( • OH) with excellent stability for multiple usages (more than 10 cycles) in the NCNT/Fe(III)/H 2 O 2 system. Although carbonyl on NCNT can act as the electron supplier for Fe(III) reduction, the behavior of NCNT is distinct from common reductants such as hydroxylamine and boron. Electrochemical analysis and density functional theory calculation unveil that nitrogen sites of NCNT can weakly bind with Fe(III) to elevate the oxidation potential of Fe(III) (named near-free Fe(III), primarily FeOH 2+ ) at pH ranging from 2.0 to 4.0. Without inputs of external stimulations or electron sacrificers, near-free Fe(III) can promote H 2 O 2 induced reduction of Fe(III) to initiate Fenton chain reactions for long-lasting generation of • OH. To our delight, it is a common property of N-doped carbon materials (e.g., graphene, carbon nanofibers, and acetylene black), our research thus provides a novel, sustainable, and green strategy for promoting Fenton chemistry.
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Catalysts
·
2021
·Vol. 11
·期 11
·1265
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IF 4.146
Yanli Chen,Yanping Ye,Qiang Tao,Lihua Yang,Jiaen Cheng,Xiaoyan Liu,Jian Cao,Hougang Fan,Maobin Wei,Pinwen Zhu,Lili Yang,Jinghai Yang
The forms of boron atoms are many and varied in the structure of transition metal borides (TMBs). The form of boron atoms determines the structure, morphology, and properties of borides. Herein, transition metal monoborides (CrB and WB) with different arrangement of one-dimensional (1D) boron chains were synthesized under high pressures and high temperatures. The 1D boron chains between the interlayers of CrB are parallel to one another, while the 1D boron chains between the interlayers of WB are perpendicular to one another. The morphologies of CrB and WB also show large differences due to the difference in 1D boron chain arrangement. As electrocatalysts for hydrogen evolution reactions (HERs), CrB and WB show good catalysis activity and durability. WB has the smallest overpotential (210 mV) and Tafel slope (90.09 mV dec−1), which is mainly attributed to the intercrossing boron chains improving the electrical properties of WB, as well as the 5d electrons of W being more chemically active. The TOF value of WB is 1.35 s−1, proving that WB has a higher intrinsic catalytic activity during HERs. This work provides a data reference for the development of high-efficiency electrocatalysts.Keywords:transition metal monoborides;1D boron chains;high pressure and high temperature;electrocatalyst;hydrogen evolution reaction;periodic bond chain theory
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
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IF 5.816
Jianxun Zhao,Jian Lv,Dayong Liu,Wanqiang Liu,Heng Liu,Peng Chen,Xinwei Wang,Yong Cheng,Xin Guo
Co 2 B alloy was synthesized via the method of high temperature solid phase. Carbon fiber (CF) was prepared from cotton by calcination process. The addition of carbon fiber and Co 3 O 4 improves corrosion resistance and charge transfer speed of the composite material electrode . The R ct value of Co 2 B + 1 wt.% CF was 360 mΩ, lower than the other composite electrode could reduce charge transfer resistance . The overall electrochemical performance of Co 2 B + 2 wt.% Co 3 O 4 + 1 wt.% CF was best among all the electrodes, and its C max could reach 715.3 mAh/g. The high conductivity and multiple reaction sites provided by carbon fiber and the catalytic effect of Co 3 O 4 may be the main reasons for the improvement of electrochemical performance, which enhance the kinetic performance of electrochemical reactions . The synergistic effect of carbon fiber and Co 3 O 4 improves the electrochemical hydrogen storage properties of Co 2 B alloy. This work presents a simple and effective method to improve the electrochemical hydrogen storage performance of cobalt-boron alloys by adding transition metal oxides and carbon materials derived from biomass.
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Nano-Micro Letters
·
2021
·Vol. 13
·期 1
·1-13
·
IF 16.419
Chen Keng,Wang Zeming,Wang Liang,Wu Xiuzhen,Hu Bingjie,Liu Zheng,Wu Minghong
High-efficiency electrochemical hydrogen evolution reaction (HER) offers a promising strategy to address energy and environmental crisis. Platinum is the most effective electrocatalyst for the HER. However, challenging scarcity, valuableness, and poor electrochemical stability still hinder its wide application. Here, we designed an outstanding HER electrocatalyst, highly dispersed rhodium (Rh) nanoparticles with an average diameter of only 3 nm supported on boron (B) nanosheets. The HER catalytic activity is even comparable to that of commercial platinum catalysts, with an overpotential of only 66 mV in 0.5 M H 2 SO 4 and 101 mV in 1 M KOH to reach the current density of 10 mA cm −2 . Meanwhile, the catalyst exhibited impressive electrochemical durability during long-term electrochemical processes in acidic and alkaline media, even the simulated seawater environment. Theoretical calculations unraveled that the structure–activity relationship between B(104) crystal plane and Rh(111) crystal plane is beneficial to the release of hydrogen, and surface O plays a vital role in the catalysis process. Our work may gain insights into the development of supported metal catalysts with robust catalytic performance through precise engineering of the strong metal-supported interaction effect.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
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2021
·Vol. 107
·期 1
·147-153
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IF 2.151
Zhang Rui,Dong Pengyue,Sun Hongwen,Liu Chunguang
To investigate the combined effects of excess boron (B) and high salinity on the growth of freshwater algal species, Chlorella vulgaris and Microcystis aeruginosa were cultured in the medium with different B and salinities. The results show that high levels of B and salinity inhibited the growth of the two algal species. For C. vulgaris , low levels of B can alleviate the growth inhibition induced by salinity, and low levels of salinity can also relieve the growth inhibition induced by B. In contrast, high levels of salinity have little effect on B toxicity, while high levels of B aggravate salinity stress. For M. aeruginosa , salinity aggravates B toxicity, regardless of salinity levels. B supply worsens salinity stress on M. aeruginosa , regardless of supply doses. These results suggest that it may be possible to control algal bloom by regulating B or salinities.
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PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2021
·
IF 3.382
Ali Yazdan,Bingkun Hu,Ce-Wen Nan,Liangliang Li
Boron nitride nanotubes (BNNTs) possess many fascinating properties that make them promising for various applications in microelectronics, biomedicine and coating. In this work, BNNTs were synthesized by a ball milling-annealing method. Boron powder was milled with promoters, lead(II) oxide (PbO) and iron(III) nitrate nonahydrate (Fe(NO 3 ) 3 ⋅9H 2 O), under the N 2 gas environment to prepare a precursor. Then, bamboo-like and cylindrical BNNTs were synthesized by annealing the precursor at 1150 °C under the NH 3 gas environment. The phase of the BNNTs was identified to be hexagonal BN by X-ray diffractometry, Raman spectroscopy and transmission electron microscopy . The effect of the promoter content in the precursor on the synthesis of the BNNTs was investigated. When the mass ratio of B:PbO:Fe(NO 3 ) 3 ⋅9H 2 O was 1:1:1, bamboo-like and cylindrical BNNTs with a diameter of 60–500 nm, uniform composition and polycrystalline microstructure were obtained.
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ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 27
·2101820
·
IF 18.808
Jihong Li,Yipu Liu,Hui Chen,Zhankai Zhang,Xiaoxin Zou
The realization of seawater electrolysis requires high-performing anode materials that should possess good catalytic activity, stability, and specificity for the oxygen evolution reaction (OER) as well as high resistance toward chloride corrosion. Herein, the design of a multilayered oxygen-evolution electrode is reported to meet the multiple needs of anode material for saline water splitting. The multilayered electrode is synthesized through direct thermal boronization of commercially available NiFe alloy plate with boron powder, followed by electrochemical oxidation. And this electrode is composed of the surface oxidized NiFeBx alloy layer, the NiFeBx alloy interlayer, and the NiFe alloy substrate. The boron species are present in the form of metaborate in the outermost oxidized NiFeBx layer, and their existence is conductive to the generation and stabilization of the catalytic active phase γ-(Ni,Fe)OOH. The introduction of NiFeBx interlayer effectively prevents the excessive oxidative corrosion of the anode material in the electrolyte containing chloride ions.
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SOLID STATE COMMUNICATIONS
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2021
·
IF 1.804
Wenjia Liang,Lu Zhang,Xiaojun Xiang,Junpu Wang,Liu Zhang,Binbin Wu,Yipeng Wang,Yan Zeng,Shixue Guan,Qiqi Tang,Fang Peng
Single-crystal boron phosphide (BP), a high-temperature semiconductor, is prepared by a eutectic melting method. Large BP single crystals (>1 mm) are synthesized at high pressure and high temperature (5.0 GPa and 3000 °C). Their growth mechanism is analyzed. Ultraviolet–visible spectroscopy and thermogravimetry/differential thermal analysis show that BP is an indirect semiconductor (2.01 eV) and has excellent thermal stability (>1200 °C). Success in the synthesis of good BP crystals offers a huge opportunity to determine their intrinsic properties and will also stimulate more research on their performance as semiconductors.
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