Highly Dispersed Bimetallic Nanoparticles Supported on Titanium Carbides for Remarkable Hydrogen Release from Hydrous Hydrazine

Abstract

The catalytic decomposition of hydrous hydrazine (N2H4⋅H2O) is considered a promising candidate for the fuel‐cell field, but sluggish reaction kinetics dramatically impede its practical application. In this study, bimetallic RhNi nanoparticles were successfully anchored on titanium carbides (MXene) by a one‐step wet‐chemical method to build superior catalysts for the decomposition of hydrous hydrazine (N2H4⋅H2O), a compound that can be used for chemical hydrogen storage. The synthesized RhNi/MXene catalysts were characterized by X‐ray photoelectron spectroscopy, transmission electron microscopy, high‐angle annular dark‐field scanning transmission electron microscopy, and inductively coupled plasma atomic emission spectroscopy. As a result of the particles size and a synergistic effect, the Rh0.8Ni0.2/MXene nanocatalyst demonstrated 100 % selectivity to H2, excellent stability, and high reaction kinetics with a turnover frequency of 857 h−1 for the decomposition of N2H4⋅H2O in alkaline solution.

Rh‐Based Nanocatalysts for Heterogeneous Reactions

“…For instance, bimetallic nickel‐rhodium nanoparticles deposited on ZIF‐8 showed excellent catalytic performance in the dehydrogenation of hydrous hydrazine in alkaline solution with a turnover frequency (TOF) value of 140 h −1 and 100% hydrogen selectivity at 50 °C . Higher TOF value of 857 h −1 at 50 °C towards hydrous hydrazine decomposition in alkaline solution was achieved by anchoring RhNi nanoparticles on titanium carbides . In other studies, the doping of Rh with a non‐metal element, such as B and P, have proved to benefit the hydrogen generation …”

“…[130] Higher TOF value of 857 h À1 at 50 8C towards hydrous hydrazine decomposition in alkaline solution was achieved by anchoring RhNi nanoparticles on titanium carbides. [131] In other studies, the doping of Rh with a non-metal element, such as B and P, have proved to benefit the hydrogen generation. [132][133][134] Manipulating the morphology of Rh-based catalysts also helps promote the catalytic activity.…”

Hydrogen Production from Ammonia Borane over PtNi Alloy Nanoparticles Immobilized on Graphite Carbon Nitride

“…With the ever-growing consumption of fossil energy, accompanied with serious environmental issues, searching for green, sustainable, abundant, and alternative energy sources is of burgeoning urgency [1,2]. Hydrogen, as a clean energy source, has attracted significant research interest owing to its distinctive merits such as producing only water as a by-product and possessing more energy density than that of fossil fuels [3][4][5]. However, hydrogen, possessing the feature of low density, makes it difficult to liquefy and compress, thus hindering the large-scale applications [4][5][6].…”

“…Hydrogen, as a clean energy source, has attracted significant research interest owing to its distinctive merits such as producing only water as a by-product and possessing more energy density than that of fossil fuels [3][4][5]. However, hydrogen, possessing the feature of low density, makes it difficult to liquefy and compress, thus hindering the large-scale applications [4][5][6]. Therefore, the exploration and seek for hydrogen storage materials with outstanding performance remains a challenging issue.…”

Hydrogenation Production from Ammonia Borane over PtNi Alloy Nanoparticles Immobilized on Graphite Carbon Nitride

“…With the ever-growing consumption of fossil energy, accompanying with seriously environmental issues, searching for green, sustainable, abundant and alternative energy sources is of burgeoning urgency [1,2]. Hydrogen, as a clean energy source, has attracted significant research interest owing to its distinctive merits such as producing only water as a by-product and possessing more energy density than that of fossil fuels [3][4][5]. However, hydrogen, possessing the feature of low density, makes it difficult to liquefy and compress, thus hindering the large-scale applications [4][5][6].…”