JOURNAL OF THE ELECTROCHEMICAL SOCIETY
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2021
·Vol. 168
·期 12
·123509
·
IF 4.316
Xianglin Liu,Yongsong Ma,Peng Li,Huayi Yin,Dihua Wang
MoB2 is synthesized by the electrochemical reduction of solid MoS2/B mixture in molten NaCl-KCl at 700 °C. Unlike the traditional methods, the electrolysis method employs the low-cost MoS2 feedstock and the boronization reaction happens at a low temperature of 700 °C. The electrochemically induced boronization involves two steps: the electrochemical desulfurization to generate Mo and the reaction of Mo with B to form MoB2. The S2− released from the reduction of MoS2 transfers to the carbon anode and is oxidized to sulfur gas, realizing a green synthetic process. In addition, the influences of molar ratio of MoS2 and amorphous boron and electrolysis cell voltage on the phase composition and morphology of electrolytic products were studied. The obtained MoB2 particles possess a uniform nodular morphology. Overall, this paper provides a straightforward and green process to prepare MoB2 nanoparticles using economically affordable raw materials at low temperature, and this method can be extended to prepare other borides.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2021
·
IF 19.503
Hong Yu Zhou,Yan Bin Qu,Jian Chen Li,Zhi Li Wang,Chun Cheng Yang,Qing Jiang
Carbon-free electrocatalytic nitrogen reduction reaction (NRR) is an attractive replacement of the current Haber-Bosch method. However, there is a lack of suitable electrocatalysts that simultaneously achieve both high activity and selectivity, hindering the practical applications of NRR. Herein we theoretically design an electron-deficient surface of MoB 2 for preferential N 2 adsorption and thus increase the local concentration of N 2 around the active sites. These lead to outstanding NRR selectivity that can evidently retard the competing HER even at the NRR operating potential. The corresponding theoretical limiting potential for NRR is as low as − 0.34 V. Our proof-of-concept experiment confirms the above theoretical design, in which excellent NRR performances (NH 3 yield rate of ~ 40.94 μg h −1 mg −1 , FE of ~ 30.84%) have been achieved. The strategy of inducing electron deficiency on active sites provides new insight into the rational design of NRR electrocatalysts for realizing green and effective ammonia synthesis in practical applications.
研究领域:
材料科学
·
化学工程
·
催化
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hao Fu,Qinghua Zhao,Yuqi Zhang,Xichao Dong,Xingang Luan,Laifei Cheng
The thin-film electrode, as the core unit of wireless passive surface acoustic wave sensors, undertakes the signal conversion function. However, finding materials for thin-film electrodes that endure high temperatures while retaining excellent conductivity remains a formidable challenge. In this research, a series of SiHfBCN-based films doped with different fillers were fabricated via the polymer-derived ceramic method. Subsequently, the effect of film microstructure on room- and high-temperature conductivity was studied. Results showed the sole MoB 2 -doped film demonstrated the best electrical conductivity at room temperature. In contrast, adding CNTs lowered film conductivity due to filler agglomeration. Nevertheless, higher film pyrolysis temperatures built better conductive networks. At high temperatures, SiHfBCN-based films exhibited much lower resistivity compared to room temperature, with a minimum of 0.1 Ω cm. Moreover, after the high-temperature test, the films still retained a dense surface morphology. These findings strongly suggest SiHfBCN-based films have great promise and application potential for high-temperature electrodes.
研究领域:
材料科学
·
无机非金属材料
·
高温功能材料
·
电子器件材料
·
陶瓷工程
✓ 已验证
DOI
高影响因子
HIGH PRESSURE RESEARCH
·
2013
·
IF 0.901
Shuai Yin,Duanwei He,Chao Xu,Wendan Wang,Haikuo Wang,Liang Li,Lili Zhang,Fangming Liu,Pingping Liu,Zhigang Wang,Chuanmin Meng,Wenjun Zhu
High pressure and high temperature synthesized MoB2 and WB2 compacts were investigated using X-ray diffraction, energy dispersive spectroscope, scanning electron microscope, Vickers indentation test and ultrasonic measurements. Experiments showed that both MoB2 and WB2 compacts are phase pure and with a grain size of 100–200 nm. Vickers indentation test under a large loading force of 49 N showed that the Vickers hardness of MoB2 and WB2 are about 21 and 22 GPa, respectively. The bulk modulus and shear modulus are about 296 GPa, and 190 GPa for MoB2 and 349 and 200 GPa for WB2 through ultrasonic measurements. Our results indicate that MoB2 and WB2 are both hard materials with a hardness similar to that of tungsten carbide, which is widely used in industry.
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Xiaojian Pan,Xinyu Gao,Jiaru He,Jing Zhao,Keheng Pan,Yongjun Cao,Lihong Bao
Developing efficient electrocatalysts for the hydrogen evolution reaction (HER) is essential for sustainable energy conversion. In this work, a ternary Pt/LaPO 4 /MoB 2 heterostructure has been synthesized using a combined sol-gel, solid-state reaction and impregnation method. The optimal 1.5 wt% Pt/LaPO 4 /MoB 2 catalyst exhibits remarkable HER activity with an low overpotential of 84 mV at 10 mA cm −2 , and surpasses the commercial Pt/C at high current density (>100 mA cm −2 ). This enhanced HER performance is originated from a unique synergistic effect where metallic MoB 2 facilitates rapid electron transfer while LaPO 4 acts as a proton reservoir by forming [HPO 4 ] 2- structures to increase local H + concentration. This robust interfacial coupling effectively optimizes the electronic structure and accelerates charge-carrier transfer kinetics via the triple-phase boundaries, offering a promising strategy for large scale and high efficiency hydrogen production.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Luyan Shi,Chenxi Shang,Ke Zhu,Fengli Wei,Bin Wu,Tayirjan Taylor Isimjan,Xiulin Yang
The development of efficient and long-lasting catalysts for hydrogen generation is vital for advancing innovations in clean energy technologies. In this study, we synthesized and characterized Co 2 B-MoB 2 /CMO, a crystalline/amorphous heterointerface catalyst, for sodium borohydride (NaBH 4 ) hydrolysis, achieving a high hydrogen generation rate of 7364.3 mL min –1 g –1 at 298 K. The activation energy of 44.4 kJ mol –1 was lower than that of most reported catalyst. Both experimental and theoretical analyses demonstrate that Co defects and the interfacial regions between crystalline and amorphous phases in Co 2 B-MoB 2 /CMO are essential in integrating critical factors, such as a high concentration of unsaturated coordination sites. These features not only alter the surface electronic properties but also enhance the adsorption of H 2 O molecules and promote the dissociation of the BH 4 – , thereby optimizing catalytic performance. In addition, the NaBH 4 hydrolysis hydrogen production system based on this catalyst successfully drove a hydrogen-air fuel cell and lit up a small light bulb, demonstrating its potential in practical applications.
研究领域:
催化
·
氢能
·
材料科学
·
可再生能源
·
纳米材料
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Yao Yang,Jianqiang Bi,Linjing Qiao,Guandong Liang,Shuyong Liang,Shushuai Liu,Shaoyin Wang,Hongyu Gong,Zhao Qian,Jinwang Shi,Weiqiang Li
The properties of molybdenum diboride are intricately tied to its crystal structure, which includes two distinct phases, α-MoB 2 and β-MoB 2 . The α-MoB 2 exhibits superior electrical and catalytic properties, akin to those of graphite due to the similar HCP structure. Nevertheless, the transformation between α-MoB 2 and β-MoB 2 is complicated and the formation of α-MoB 2 remains challenge due to higher Gibbs free energy. The MoB 2 powder synthesized through boro/carbothermal reduction in this study suggests the β phase, transforming into α-MoB 2 completely via a high-entropy strategy. It founds that the introduction of high-entropy diborides (HEB) effectively inhibits the grain growth of samples, resulting in a significant enhancement in their hardness. The potential for the formation of a single-phase between MoB 2 and HEB is associated with Pauling electronegativity difference, δ χP . Furthermore, the formation of a single-phase solid solution was found to contribute to the improvement in the fracture toughness of the samples. This work presents a novel strategy for stabilizing α-MoB 2 , offering valuable insights into understanding phase-transition behavior in MoB 2 and the solid solubility in multi-component ceramics.
研究领域:
材料科学
·
固体力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）