Designing Highly Active High Current Density HER Electrocatalysts: Synergistic Effects of Mo and W in α-Mo xW 1-XB 2 with Graphene-Like Boron Layers
35 Pages Posted: 26 Oct 2018 Sneak Peek Status: Under ReviewMore...
Transition metal borides belong to a small class of non-noble-metal electrocatalysts which exhibit excellent activity toward hydrogen evolution reaction (HER) already in bulk form, especially those containing the graphene-like (flat) boron layer such as α-MoB2 are particularly promising. In this study, we show that tungsten, whose diboride (β-WB2) contains the less active puckered (phosphorene-like) boron layer, can be successfully substituted (up to 30%) for molybdenum in α-MoB2. The resulting α-MoxW1-xB2 exhibits far better HER activity and stability than α-MoB2. Furthermore, α-MoxW1-xB2 performs particularly well at high current density, outperforming even bulk platinum above 70 and 125 mA/cm2 in basic and acidic electrolytes, respectively. This result should pave the way for high current density, abundant and inexpensive bulk and nanoscale HER catalysts.
Keywords: Abundant electrocatalysts; HER; Solid solution; α-MoxW1-xB2; high current density
Suggested Citation: Suggested Citation