Ultra-Low-Loaded Platinum Bonded Hexagonal Boron Nitride as Stable Electrocatalyst for Hydrogen Generation.
Rayantan SadhukhanAmar KumarPonnappa K PrasannaAnku GuhaKaushik GhoshSudip ChakrabortyTharangattu N NarayananPublished in: ACS applied materials & interfaces (2024)
Chemical stability of hexagonal boron nitride (hBN) ultrathin layers in harsh electrolytes and the availability of nitrogen site in hBN to stabilize metals like Pt are used here to develop a high intrinsic activity hydrogen evolution reaction (HER) catalyst having low loaded Pt (5 weight% or <1 atomic%). A catalyst having a nonzero oxidation state for Pt (with a Pt-N bonding) is shown to be HER active even with low catalyst loadings (0.114 mgcm -2 ). Electronic modification of the shear exfoliated hBN sheets is achieved by Au nanoparticle-based surface decoration (hBN_Au), and further anchoring with Pt develops a catalyst (hBN_Au_Pt) with high turnover frequency for HER (∼15). The hBN_Au_Pt is shown to be a highly durable catalyst even after the accelerated durability test for 10000 cycles and temperature annealing at 100 °C. Density functional theory based calculations gave insights in to the electronic modifications of hBN with Au and the catalytic activity of the hBN_Au_Pt system, in line with the experimental studies, indicating the demonstration of a new class of catalyst system devoid of issues such as carbon corrosion and Pt leaching.
Keyphrases
- reduced graphene oxide
- visible light
- gold nanoparticles
- ionic liquid
- density functional theory
- room temperature
- sensitive detection
- metal organic framework
- highly efficient
- drug delivery
- carbon dioxide
- physical activity
- body mass index
- nitric oxide
- high resolution
- quantum dots
- postmenopausal women
- hydrogen peroxide
- risk assessment
- health risk
- human health
- heavy metals
- weight loss
- mass spectrometry
- weight gain