Mechanism and Kinetics of Hydrogen Peroxide Decomposition on Platinum Nanocatalysts

ACS Applied Materials & Interfaces
Rui Serra-MaiaF Marc Michel

Abstract

The decomposition of H2O2 to H2O and O2 catalyzed by platinum nanocatalysts controls the energy yield of several energy conversion technologies, such as hydrogen fuel cells. However, the reaction mechanism and rate-limiting step of this reaction have been unsolved for more than 100 years. We determined both the reaction mechanism and rate-limiting step by studying the effect of different reaction conditions, nanoparticle size, and surface composition on the rates of H2O2 decomposition by three platinum nanocatalysts with average particle sizes of 3, 11, and 22 nm. Rate models indicate that the reaction pathway of H2O2 decomposition is similar for all three nanocatalysts. Larger particle size correlates with lower activation energy and enhanced catalytic activity, explained by a smaller work function for larger platinum particles, which favors chemisorption of oxygen onto platinum to form Pt(O). Our experiments also showed that incorporation of oxygen at the nanocatalyst surface results in a faster reaction rate because the rate-limiting step is skipped in the first cycle of reaction. Taken together, these results indicate that the reaction proceeds in two cyclic steps and that step 1 is the rate-limiting step. Step 1: Pt + H2 O...Continue Reading

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Citations

Feb 1, 2019·Nature Communications·Allan M BrooksKyle J M Bishop
Nov 2, 2019·Journal of Colloid and Interface Science·Sarvajith Malali SudhakaraMusthafa Ottakam Thotiyl
May 20, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Shuying LiConghua Xie
Jun 9, 2021·Chemical Society Reviews·Bin DongNing Fang
Sep 6, 2018·ACS Applied Materials & Interfaces·Divya PanchanathanGareth H McKinley
Dec 10, 2019·Journal of the American Chemical Society·Luis M OlaecheaChristoph Weder
Jul 21, 2020·Journal of the American Chemical Society·Bin DongNing Fang
May 16, 2019·ACS Nano·Chunmei ZhouLiqiu Wang
Nov 23, 2021·Analytical Chemistry·Kaisong YuanAlberto Escarpa
Nov 27, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Abimbola A AshajuRob G H Lammertink

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