Interlayer ligand engineering of β-Ni(OH)2 for oxygen evolution reaction

November 11, 2020

Oxygen evolution reaction (OER) is a key process for many energy devices such as electrolyzers and rechargeable metal-air batteries. Tremendous studies have been devoted to obtaining cost-effective, efficient and durable OER catalysts. Among them, nickel-based materials are considered to be promising candidates for OER in alkaline media. However, their performances are still below the expectation and the active sites are often controversial.

Recently, Associate Professor Yuqin Zou from Hunan University and Professor Xia Lu from Sun Yat-sen University proposed an interlayer ligand engineering strategy on β-Ni(OH)2 for OER.

The alkoxyl substituted β-Ni(OH)2 are facilely prepared by an one-step solvothermal reaction. Assisted by subsequent powder X-ray diffraction (PXRD) and crystalline structure computational simulation, the corresponding chemical formula can be described as Ni[(OH)1-y(L)y]2 (0?y?1), in which L represents alkoxyl ligands. The selected alkoxyl could be methoxyl, ethoxyl, propoxyl and isopropoxyl, or even the combination of methoxyl and ethoxyl. Owing to the chain length, electronegativity and hydrophilicity differences of these alkoxyl, the alteration of electron configuration and three-phase interfaces of Ni[(OH)1-y(L)y]2 are achieved, and the ethoxyl substituted one (NiEt) shows great potential to be efficient OER catalysts (Figure 1).

Combining with X-ray absorption spectroscopy (XAS) and other ex situ physical analysis, the critical active species of NiEt is formed via hydroxylation and subsequent de-protonation, existing as high valent Niδ+ (3<δ?3.66). According to the further operando XAS studies, the corresponding reaction pathway is tracked and catalysis mechanism is proposed.
See the article: He JY, Zou YQ, Huang YC, Li CH, Liu YB, Zhou L, Dong CL, Lu X, Wang SY. Interlayer Ligand Engineering of β-Ni(OH)2 for Oxygen Evolution. Sci. China Chem., 2020, DOI:10.1007/s11426-020-9844-2


Science China Press

Related Critical Active Species Articles from Brightsurf:

Viruses play critical role in evolution and survival of the species
New research in Nature Structural & Molecular Biology shows viruses also play a key evolutionary role in mammals' ability to reproduce and survive, according to scientists in the Cincinnati Children's Perinatal Institute and at Azabu University in Japan.

Differences between discs of active and non-active galaxies detected for the first time
A study led by researchers at the Instituto de Astrofísica de Canarias (IAC), making comparison between the discs of several pairs of spiral galaxies, active and non-active, concludes that in the discs of the former the rotational motion of the stars is of greater importance.

Scientists discover volcanoes on Venus are still active
A new study identified 37 recently active volcanic structures on Venus.

Two new species of parasite discovered in crabs -- discovery will help prevent infection of other marine species
Two new species of parasite, previously unknown to science, have been discovered in crabs in Swansea Bay, Wales, during a study on disease in the Celtic and Irish Seas.

Don't Let social isolation keep you from being active
Researchers from the University of Sao Paulo in Brazil recently reported on the dangers of physical inactivity for older adults during the COVID-19 pandemic.

Men and younger adults less active in lockdown
New research published in the journal BMJ Open Sport and Exercise Medicine indicates that men and younger adults have been less physically active during the COVID-19 lockdown.

Marine species are outpacing terrestrial species in the race against global warming
Global warming is causing species to search for more temperate environments in which to migrate to, but it is marine species -- according to the latest results of a Franco-American study mainly involving scientists from the CNRS, Ifremer, the Université Toulouse III-Paul Sabatier and the University of Picardy Jules Verne -- that are leading the way by moving up to six times faster towards the poles than their terrestrial congeners.

Sun is less active than similar stars
By cosmic standards the sun is extraordinarily monotonous. This is the result of a study presented by researchers from the Max Planck Institute for Solar System Research in the upcoming issue of Science.

New active ingredient against allergic asthma
Our immune system protects us against pathogens. However, an excessive immune reaction can trigger allergies or chronic asthma.

Directed species loss from species-rich forests strongly decreases productivity
At high species richness, directed loss, but not random loss, of tree species strongly decreases forest productivity.

Read More: Critical Active Species News and Critical Active Species Current Events is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to