scholarly journals Metal-Rich Transition Metal Diborides as Electrocatalysts for Hydrogen Evolution Reactions in a Wide Range of pH

2016 ◽  
Vol 163 (13) ◽  
pp. H1069-H1075 ◽  
Author(s):  
Steven J. Sitler ◽  
Krishnan S. Raja ◽  
Indrajit Charit
Keyword(s):  
Transition Metal ◽  
Hydrogen Evolution ◽  
Wide Range ◽  
Metal Diborides ◽  
Hydrogen Evolution Reactions ◽  
Transition Metal Diborides

Tailoring the d-band center by borophene subunits in chromic diboride toward the hydrogen evolution reaction

2021 ◽  
Author(s):  
Yanli Chen ◽  
Jiashi Rong ◽  
Zizhun Wang ◽  
Qiang Tao ◽  
Quan Gan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Band Center ◽  
Metal Diborides ◽  
Transition Metal Diborides

Transition metal diborides (TMdBs AlB2-type P6/mmm) electrocatalyst arouse much attention towards hydrogen evolution reaction (HER), because of MoB2 (P6/mmm) exhibits superior catalytic activity. While the deep reason of activity in...

scholarly journals Enabling highly efficient and broadband electromagnetic wave absorption by tuning impedance match in high-entropy transition metal diborides (HE TMB2)

2021 ◽  
Author(s):  
Weiming Zhang ◽  
Fu-Zhi Dai ◽  
Huimin Xiang ◽  
Biao Zhao ◽  
Xiaohui Wang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Transition Metal ◽  
Impedance Match ◽  
Magnetic Losses ◽  
High Entropy ◽  
Wave Absorption ◽  
Highly Efficient ◽  
Absorbing Materials ◽  
Metal Diborides ◽  
Transition Metal Diborides

AbstractThe advance in communication technology has triggered worldwide concern on electromagnetic wave pollution. To cope with this challenge, exploring high-performance electromagnetic (EM) wave absorbing materials with dielectric and magnetic losses coupling is urgently required. Of the EM wave absorbers, transition metal diborides (TMB2) possess excellent dielectric loss capability. However, akin to other single dielectric materials, poor impedance match leads to inferior performance. High-entropy engineering is expected to be effective in tailoring the balance between dielectric and magnetic losses through compositional design. Herein, three HE TMB2 powders with nominal equimolar TM including HE TMB2-1 (TM = Zr, Hf, Nb, Ta), HE TMB2-2 (TM = Ti, Zr, Hf, Nb, Ta), and HE TMB2-3 (TM = Cr, Zr, Hf, Nb, Ta) have been designed and prepared by one-step boro/carbothermal reduction. As a result of synergistic effects of strong attenuation capability and impedance match, HE TMB2-1 shows much improved performance with the optimal minimum reflection loss (RLmin) of −59.6 dB (8.48 GHz, 2.68 mm) and effective absorption bandwidth (EAB) of 7.6 GHz (2.3 mm). Most impressively, incorporating Cr in HE TMB2-3 greatly improves the impedance match over 1–18 GHz, thus achieving the RLmin of −56.2 dB (8.48 GHz, 2.63 mm) and the EAB of 11.0 GHz (2.2 mm), which is superior to most other EM wave absorbing materials. This work reveals that constructing high-entropy compounds, especially by incorporating magnetic elements, is effectual in tailoring the impedance match for highly conductive compounds, i.e., tuning electrical conductivity and boosting magnetic loss to realize highly efficient and broadband EM wave absorption with dielectric and magnetic coupling in single-phase materials.

A Low-cost 2D WO3/Ni3S2 heterojunctions for highly stable hydrogen evolution

2021 ◽  
Author(s):  
Minmin Wang ◽  
Tongming Sun ◽  
Weiting Zhong ◽  
Mengke Zhang ◽  
Jin Wang ◽  
...  
Keyword(s):  
Transition Metal ◽  
Hydrogen Evolution ◽  
Tungsten Trioxide ◽  
Precious Metal ◽  
Low Cost ◽  
Metal Catalysts ◽  
Precious Metal Catalysts ◽  
Hydrogen Evolution Reactions

Transition metal-based nanohybrid has recently been demonstrated an electrocatalyst which show great potential to replace commercial precious metal catalysts in hydrogen evolution reactions. Herein, tungsten trioxide/nickel disulfide (WO3/Ni3S2) heterojunction is...

Transition-metal-doped NiSe2 nanosheets towards efficient hydrogen evolution reactions

Nano Research ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 6051-6061 ◽  
Author(s):  
Tongtong Wang ◽  
Daqiang Gao ◽  
Wen Xiao ◽  
Pinxian Xi ◽  
Desheng Xue ◽  
...  
Keyword(s):  
Transition Metal ◽  
Hydrogen Evolution ◽  
Hydrogen Evolution Reactions ◽  
Metal Doped

High-entropy transition metal diborides by reactive and non-reactive spark plasma sintering: A comparative investigation

2020 ◽  
Vol 40 (4) ◽  
pp. 942-952 ◽  
Author(s):  
Giovanna Tallarita ◽  
Roberta Licheri ◽  
Sebastiano Garroni ◽  
Simone Barbarossa ◽  
Roberto Orrù ◽  
...  
Keyword(s):  
Transition Metal ◽  
Spark Plasma Sintering ◽  
Comparative Investigation ◽  
High Entropy ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Metal Diborides ◽  
Transition Metal Diborides

Compressibility of AlB2-type transition metal diborides

2002 ◽  
Vol 14 (44) ◽  
pp. 10615-10618 ◽  
Author(s):  
A S Pereira ◽  
C A Perottoni ◽  
J A H da Jornada ◽  
J M L ger ◽  
J Haines
Keyword(s):  
Transition Metal ◽  
Type Transition ◽  
Metal Diborides ◽  
Transition Metal Diborides
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