Active and highly durable supported catalysts for proton exchange membrane electrolysers.

The design and development of supported catalysts for the oxygen evolution reaction (OER) is a promising pathway to reducing iridium loading in proton exchange membrane water electrolysers. However, supported catalysts often suffer from poor activity and durability, particularly when deployed in membrane electrode assemblies. In this work, we deploy iridium coated hollow titanium dioxide particles as OER catalysts to achieve higher Ir mass activities than the leading commercial catalysts.

An investigation of the structural and electronic origins of enhanced chemical looping air separation performance of B-site substituted SrFeCoO perovskites.

Chemical looping air separation (CLAS) is a promising process intensification technology for extracting oxygen from air for oxygen enrichment in process streams. Co-doped strontium ferrites (SrFeCoO) have been found to have outstanding activities for CLAS processes. In this study, we explore the underlying factors driving the enhancement in oxygen uptake and release performance of perovskite structured SrFeCoO oxygen carriers for CLAS.

Defect Engineering of Low-Coordinated Metal-Organic Frameworks (MOFs) for Improved CO Access and Capture.

While metal-organic frameworks (MOFs) are promising gas adsorbents, their tortuous microporous structures cause additional resistance for gas diffusion, thus hindering the accessibility of interior active sites. Here, we present a practical strategy to incorporate missing cluster defects into a representative low-coordinated MOFs structure, Mg-MOF-74, while maintaining the stability of a defect-rich structure. In this proposed method, graphene oxide (GO) is employed as modulator, and crystallization time is varied to promote defect formation by altering the nucleation and crystal growth processes.

Two Anthracene-Based Ir(III) Complexes [Ir(pbt)(aip)]Cl and [Ir(pbt)(aipm)]Cl: Relationship between Substituent Group and Photo-oxidation Activity as Well as Photo-oxidation-Induced Luminescence.

Two anthracene-based complexes [Ir(pbt)(aip)]Cl () and [Ir(pbt)(aipm)]Cl () have been synthesized based on the ligands aip = 2-(9-anthryl)-1-imidazo[4,5-][1,10]phenanthroline, aipm = 2-(9-anthryl)-1-methyl-imidazo[4,5-][1,10]phenanthroline, and pbtH = 2-phenylbenzothiazole in order to explore both the influence of the substituent group R (R = H in and CH in ) on photo-oxidation activity and photo-oxidation-induced luminescence. Both H NMR spectra and ES mass spectra indicate that the anthracene moiety in complex can be oxidized at room temperature upon irradiation with 365 nm light. Thus, this complex shows photo-oxidation-induced turn-on yellow luminescence.

Cyclometalated Ir(iii) complexes based on 2-(2,4-difluorophenyl)-pyridine and 2,2'-(2-phenyl-1H-imidazole-4,5-diyl)dipyridine: acid/base-induced structural transformation and luminescence switching, and photocatalytic activity for hydrogen evolution.

Based on ligands dfppyH and pidpyH, cyclometalated Ir(iii) complexes [Ir(dfppy)(pidpyH)](PF) (1·PF) and [Ir(dfppy)(pidpy)] (2) have been synthesized. The crystal structures indicate that each {Ir(dfppy)} unit is coordinated by a neutral ligand pidpyH in 1·PF, while by a pidpy anion in 2. The packing structure of 1·PF only exhibits electrostatic interactions and van der Waals interactions among [Ir(dfppy)(pidpyH)] cations and PF ions.