Electrocatalytic and photocatalytic hydrogen evolution reaction (e-HER and p-HER) are two possible strategies to realizing renewable energies to hydrogen conversion, solving both the energy crisis and environmental pollution. Platinum is the most effective catalyst for the HER in acidic solutions. However, its large-scale application is hampered by the high price and scarcity. Herein, we report atomic platinum anchored on TiO2 quasi quantum dots/graphene-nanosheet (Pt-T/G) by photodeposition. The Pt-T/G catalyst exhibits exceptionally high activity and stability for e-HER in acid condition, outperforming the state-of-the-art commercial Pt/C catalyst by a factor of 17.5 on Pt mass basis, allowing for over 93 % reduction in Pt loadings. Moreover, it achieves remarkably high photocatalytic efficiency (686.8 μmol h-1), which is nearly seven times as high as that of pristine T/G composite (101.3 μmol h-1). The well atomic dispersion and balance of electrochemical and photochemical effect contributes to the excellent performance. This work paves a new bridge for the comprehensive utilization of electric, light and hydrogen energy.

Atomically dispersed platinum by photodeposition: Application in electro- and photocatalytic hydrogen evolution

2019 Fall National Meeting

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