Boron‐Dependency of Molybdenum Boride Electrocatalysts for the Hydrogen Evolution Reaction

Abstract

Molybdenum-based materials have been considered as alternative catalysts to noble metals,s uch as platinum, for the hydrogen evolution reaction (HER). We have synthesized four binary bulk molybdenum borides Mo 2 B, a-MoB, b-MoB, and MoB 2 by arc-melting. All four phases were tested for their electrocatalytic activity (linear sweep voltammetry) and stability (cyclic voltammetry) with respect to the HER in acidic conditions.T hree of these phases were studied for their HER activity and by X-rayp hotoelectron spectroscopy( XPS) for the first time;M oB 2 and b-MoB show excellent activity in the same range as the recently reported a-MoB and b-Mo 2 C phases,w hile the molybdenum richest phase Mo 2 Bs how significantly lower HER activity,i ndicating as trong borondependency of these borides for the HER. In addition, MoB 2 and b-MoB show long-term cycle stability in acidic solution. Figure 5. Stability measurements (cyclic voltammetry) of b-MoB and MoB 2 for the first and the 1000th cycle in 0.5 m H 2 SO 4 .Scan rate was 100 mVs À1 .IR-drop was corrected. Angewandte Chemie Communications 5578 www.angewandte.org

Computationally Driven Discovery of a Family of Layered LiNiB Polymorphs

“…[3] On the other hand, efficient synthetic experimental approaches allow for the fast screening of compositional space,t hus allowing rapid phase discovery and timely feedback for the iterative improvement of theoretical predictions. [4] As sparked by the successful preparation and unique properties of two-dimensional (2D) transition-metal carbides (named MXenes), [5] the search for 2D borides (MBenes) has begun. [4] As sparked by the successful preparation and unique properties of two-dimensional (2D) transition-metal carbides (named MXenes), [5] the search for 2D borides (MBenes) has begun.…”

“…[3] From the functional materials perspective,t he class of transition-metal borides showcases av ariety of structural frameworks and ab road range of properties and applications. [4] As sparked by the successful preparation and unique properties of two-dimensional (2D) transition-metal carbides (named MXenes), [5] the search for 2D borides (MBenes) has begun. Computational predictions point to the stability and potential intriguing properties of 2D transition-metal borides, such as enhanced ferromagnetic Curie temperatures for spintronics,s uperior catalytic activity for the hydrogen evolution reaction, high storage capacity for lithium-ion batteries, flexibility,h igh specific surface area, and quasi-2D electron confinement.…”

Synthesis of a Highly Efficient Oxygen‐Evolution Electrocatalyst by Incorporation of Iron into Nanoscale Cobalt Borides

“…[7,8]). [11][12][13] Furthermore, electrocatalytic activities of other transition-metal borides like MoB, [14] MoB 2 , [15] and Ni 3 B [16,17] are currently under investigation. [11][12][13] Furthermore, electrocatalytic activities of other transition-metal borides like MoB, [14] MoB 2 , [15] and Ni 3 B [16,17] are currently under investigation.…”

“…Electrochemicalo xygen evolution with aC o-and B-containing catalyst has been observed as early as 1980, [9,10] and recently such (semi)amorphous electrocatalystsi mpregnatedo rm ixed with graphene or carbon nanotubes were described to exhibit exceptionally high catalytic efficiencies forO ER. [11][12][13] Furthermore, electrocatalytic activities of other transition-metal borides like MoB, [14] MoB 2 , [15] and Ni 3 B [16,17] are currently under investigation. The benchmark catalysts for the OER are still noble metal catalysts, namely IrO 2 in acidic and RuO 2 in alkaline media.…”

A facile pathway to prepare molybdenum boride powder from molybdenum and boron carbide

“…[2][3][4][5][6] Molybdenum boride is notable for its high hardness, good wear resistance and high catalytic activity and is being explored for its potential applications in wear or corrosion resistant coating, 7-9 ceramic composite materials, 10 synthesis of others compound 11 and electrocatalyst for the hydrogen evolution reaction. [12][13][14] In the boron-molybdenum binary system, 15 there are five compounds: Mo 2 B, MoB, MoB 2 (high temperature stable phase, 1790-2648 K), Mo 2 B 5 and MoB 4 , among which MoB has the highest melting point (2600 ± 8°C).…”