Harvesting mechanical energy for hydrogen generation by piezoelectric metal–organic frameworks

Abstract

Piezocatalysis, the process of directly converting mechanical energy into chemical energy, has emerged as a promising alternative strategy for green H2 production. Nevertheless, conventional inorganic piezoelectric materials suffer from limited...

Piezoelectric Metal–Organic Frameworks Based Sonosensitizer for Enhanced Nanozyme Catalytic and Sonodynamic Therapies

“…22−25 Metal−organic frameworks (MOFs), which are crystalline materials with organic−inorganic hybrid structures, are promising alternatives to the conventional piezoelectric materials owing to their simple fabrication requirements and porous structure with highly tunable dimensions. 26,27 For example, UIO-66 is a MOF with a low-symmetry crystal structure. As a crystal porous material with a customizable structure, its piezoelectric effect can be tuned by changing either the organic ligands or metal ions (Zr to Hf).…”

“…28−30 And UIO-66 has been successfully used for piezoelectric catalytic water splitting to produce hydrogen or promote photocatalytic activity through a piezoelectric effect. 26,30 As such, pairing nanozymes with the appropriate piezoelectric materials is an effective strategy to improve piezoelectric SDT and nanozyme activity without using unsafe levels of US. 31 In this study, a combination of UIO-66 and Au nanoparticles (UIO-66-Au NPs) as piezoelectric sonosensitizers is proposed.…”

“…Metal–organic frameworks (MOFs), which are crystalline materials with organic–inorganic hybrid structures, are promising alternatives to the conventional piezoelectric materials owing to their simple fabrication requirements and porous structure with highly tunable dimensions. , For example, UIO-66 is a MOF with a low-symmetry crystal structure. As a crystal porous material with a customizable structure, its piezoelectric effect can be tuned by changing either the organic ligands or metal ions (Zr to Hf). − And UIO-66 has been successfully used for piezoelectric catalytic water splitting to produce hydrogen or promote photocatalytic activity through a piezoelectric effect. , As such, pairing nanozymes with the appropriate piezoelectric materials is an effective strategy to improve piezoelectric SDT and nanozyme activity without using unsafe levels of US …”

Bi-MOFs with two different morphologies promoting degradation of organic dye under simultaneous photo-irradiation and ultrasound vibration treatment

“…Recently, high hydrogen production activity of UiO-66-NH 2 (Hf) has been achieved for the first time as the result of the strong piezoelectric response (ultrasound vibration treatment) [ 22 ]. A novel UiO-66(Zr)-F4 metal-organic framework (MOF) nanosheet for piezoelectric catalytic hydrolysis was fabricated by Shiyin Zhao et al The hydrogen precipitation rate far exceeds that of the pristine UiO-66 host, which provides a feasible strategy for tuning the piezoelectricity of UiO-66 MOFs [ 24 ]. Compared with inorganic bismuth-based materials, Bi-MOFs have relatively low thermal and chemical stability, but the large pore size and surface area, certain unsaturated metal sites, and ease of design of bismuth-based metal-organic frameworks, all make Bi-MOFs a potentially good solid catalyst material [ [25] , [26] , [27] ].…”

Harvesting mechanical energy induces piezoelectric polarization of MIL-100(Fe) for cocatalyst-free hydrogen production

“…20 For example, a kind of UiO-66(Zr)-F 4 MOFs has been reported to present a piezoelectric response owing to the introduction of a fluorinated ligand, which achieved high H 2 production under ultrasonic vibration. 21 Currently, Fe-based MOFs are emerging because of the abundant active sites and the properties of an inorganic-organic hybrid semiconductor. 22,23 Nevertheless, most studies focused on the attributes of light absorption and valence transition in Fe-MOFs to apply the materials in the field of photocatalytic pollutant degradation and Fenton-like reactions.…”