兵庫県立大：水素抽出､高効率の新触媒開発：タングステン炭化物（ＷＣ）（動画）：
Univ of Hyogo: Hydrogen extract,hi-efficiency new catalyst:Tungsten carbide:
兵库大学：氢气提取、高效新型催化剂开发：碳化钨（WC）
ー次世代エネ活用に弾み、白金並みの高効率 ー
兵庫県立大院
森下教授：次世代エネルギーとして注目される水素。
水素化合物から取り出す際、
高価な白金並みの高効率で発生させる、
代替触媒の開発に成功した。
水素を安全に利用する技術への応用が期待できる。
成果を英国王立化学会誌に掲載した。
タングステン炭化物（ＷＣ）：
森下教授は白金の代用物として、「電子配列が似ていながら、触媒としては機能しないタングステン炭化物（ＷＣ）」に着目した。
ＷＣにコバルトナノ結晶を加えると、「白金と同水準の効率で、水素を取り出せるようになった」
神戸新聞NEXT |
https://www.kobe-np.co.jp/news/sougou/202108/0014620817.shtml
Catalytic activity of Co-nanocrystal-doped tungsten carbide arising from an internal magnetic field
Abstract
Pt is an excellent and widely used hydrogen evolution reaction (HER) catalyst.
However,
it is a rare and expensive metal, and alternative catalysts are being sought to facilitate the hydrogen economy.As tungsten carbide (WC)
has a Pt-like occupied density of states, it is expected to exhibit catalytic activity.However,
unlike Pt, excellent catalytic activity
has not yet been observed for mono WC.One of the intrinsic differences between WC and Pt
is in their magnetic properties; WC is non-magnetic, whereas Pt exhibits high magnetic susceptibility.
In this study,
the WC lattice was doped with ferromagnetic Co nanocrystals to introduce an ordered-spin atomic configuration.Catalytic activity of Co-nanocrystal-doped tungsten carbide arising from an internal magnetic field
The catalytic activity of the Co-doped WC was ∼30% higher than that of Pt nanoparticles for the HER
during the hydrolysis of ammonia borane (NH3BH3),which is currently attracting attention as a hydrogen fuel source.
Measurements of the magnetisation, enthalpy of adsorption, and activation energy
indicated that the synergistic effect of the WC matrix promoting hydrolytic cleavage of NH3BH3
and
the ferromagnetic Co crystals interacting with the nucleus spin of the protons was responsible for the enhanced catalytic activity.
This study
presents a new catalyst design strategy based on the concept of an internal magnetic field.The WC–Co material presented here
is expected to have a wide range of applications as an HER catalyst.RSC Advances (RSC Publishing)
https://pubs.rsc.org/en/content/articlelanding/2021/ra/d1ra01181b