TiN nanotube supported Ni catalyst Ni@TiN-NTs: experimental evidence of structure–activity relations in catalytically hydrolyzing ammonia borane for hydrogen evolution

Abstract

Titanium nitride nanotubes (TiN-NTs) were fabricated using a hydrothermal – ammonia nitriding route, and non-noble metal nanosized Ni particles were anchored on the surface via a non-aqueous phase reduction–deposition strategy, to obtain the supported catalyst Ni@TiN-NTs.

Stepwise Reduction and In Situ Loading of Core‐Shelled Pt@Cu Nanocrystals on TiO2–NTs for Highly Active Hydrogen Evolution

“…By contrast, our previous study has confirmed that the catalytic activity of Pt@Cu bimetal nanocrystals with same metal molar ratios present evidently inferior catalytic activity to Pt@Cu(9%)/TiO 2 , [28] which should be undoubtedly attributed to the positive effect of the carrier TiO 2 -NTs. [17] The turnover frequency (TOF) can be used to more precisely describe, and evaluate the catalytic performance of a given catalyst. [13] In view of the feature of the present catalytic hydrolysis reaction, we propose a concise but reasonable formula: TOF = [P × V H2 /R × T]/(n M × t), where V H2 denotes the H 2 volume produced from the hydrolysis reaction in given reaction time t; P and T separately represent the local atmospheric Figure 6.…”

“…), [25,26] even certain nonnoble metals (e.g., Cu, Ni, etc. ), [17,27] to form more active sites on the interface/surface, effectively boosting the catalytic ability.…”

“…On the other side, the noble metal components, especially their nanoagents, are prone to loss or agglomeration in the course of service, thus reducing their activity and working life. [14][15][16] Therefore, in recent years the studying focus in the related field has gradually shifted to noble/nonnoble metal supported catalysts, with the aim of realizing high dispersing and firm bonding for the active components on some suitable carriers, [17,18] reducing the cost of the catalyst, also improving the catalytic performance. Titanium dioxide (TiO 2 ), with abnormally high chemicophysical stability, satisfactory mechanical strength, and rich morphology, has been known as one kind of promising and competitive catalytic carrier.…”

Pt|Cu Bimetallic Stratiform Nanocrystal Cluster Hierarchical Frameworks: Robust Catalyst for Hydrolyzing Ammonia Borane to Generate Hydrogen

“…The effective synergy of phase constitution, inner texture, and surface topography of the multimetal catalysts is mostly responsible for the catalytic properties, which has been testified by many related studies. [24][25][26] In consideration of the pros and cons of different metals, compositing costly but high active Pt element with cheap but low active Cu element to fabricate efficient catalysts should be well worth the expectation and attempt.Based on our previous researches, [27,28] we hereby put forward an improved Galvani substitution protocol to effectively regulate the composition, size, and shape of the Pt|Cu nanocrystals via reasonably controlling additives (e.g., reductant, modifier, and A modified Galvani substitution protocol is proposed to fabricate serial Pt|Cu nanocrystals for hydrolyzing ammonia borane to generate H 2 gas. The as-fabricated Pt|Cu spheroidal nanocrystals with mean size of 75 nm hold porously hierarchical waxberry-shaped appearance, with more subtle Pt grain cladding on Cu nanospheres to build the nanocrystal cluster frameworks.…”

“…Based on our previous researches, [27,28] we hereby put forward an improved Galvani substitution protocol to effectively regulate the composition, size, and shape of the Pt|Cu nanocrystals via reasonably controlling additives (e.g., reductant, modifier, and A modified Galvani substitution protocol is proposed to fabricate serial Pt|Cu nanocrystals for hydrolyzing ammonia borane to generate H 2 gas. The as-fabricated Pt|Cu spheroidal nanocrystals with mean size of 75 nm hold porously hierarchical waxberry-shaped appearance, with more subtle Pt grain cladding on Cu nanospheres to build the nanocrystal cluster frameworks.…”