Improved durability and activity of Pt/C catalysts through atomic layer deposition of tungsten nitride and subsequent thermal treatment

Efficient Modulation of Electrocatalyst Interfaces by Atomic Layer Deposition: Fundamentals to Application

“…[108] Nitrides synthesized by ALD also show outstanding catalytic activity similar to that of some noble metals, for the reason that the ultra-thin layer fabricated on the interface exposes more catalytic active sites. [109,110] For instance, McNeary et al [43] employed bis(tert-butylimido)bis(dimethylamido) tungsten (( t BuN) 2 (Me 2 N) 2 W) and NH 3 as the precursors of W and N, respectively, to deposit WN on the Pt/f-C [111] (internally using Pt-H 2 ALD on a functionalized black carbon substrate). For comparison, the catalytic activity and the durability of Pt/C, ALD Pt/f-C, WN deposited ten cycles and 725 °C-10 WN after heat treatment are depicted in Figure 12.…”

Surface modification and functionalization of powder materials by atomic layer deposition: a review

“…WN was deposited on the ALD Pt/C catalyst using bis( tert -butylimido)bis(dimethylamido) tungsten and ammonia as precursors, producing a conformal coating on the surface of the catalyst particles. 142 The subsequent thermal treatment led to a reduced amount of nitride and separated Pt and W domains. The surface modified Pt/C catalyst showed an ORR activity (465 mA mg −1 ) much higher than that of the bare Pt/C catalyst (277 mA mg −1 ).…”

Applications of Atomic Layer Deposition in Design of Systems for Energy Conversion

“…black resulted in negligible changes in the properties of the catalyst, a subsequent annealing at 725 °C in a H 2 atmosphere resulted in partial decomposition of the nitride and formation of a W/WN composite expressed by a significant improvement of both, the activity as well as the durability of the composite catalyst. [150] Although the alternatives to the platinum-based ORR catalysts were mentioned in the introduction of this section, there are not many examples mentioned in the literature in which preparation involving ALD is mentioned. Among the materials mentioned in the preceding parts, the ALD-prepared cobalt oxides were already mentioned as ORR suitable catalytic systems.…”

“…Although the as‐deposited coverage of the Pt on functionalized carbon black resulted in negligible changes in the properties of the catalyst, a subsequent annealing at 725 °C in a H 2 atmosphere resulted in partial decomposition of the nitride and formation of a W/WN composite expressed by a significant improvement of both, the activity as well as the durability of the composite catalyst. [ 150 ]…”