兵库大学：氢气提取、高效新型催化剂开发：碳化钨（WC）
-下一代能源利用的动力，与铂金相当的高效率-
兵库大学
森下教授：
氢作为下一代能源备受关注。
从氢化合物中去除时
与昂贵的铂金相媲美的高效发电，
成功开发替代催化剂。
有望应用于安全使用氢气的技术。
结果发表在英国皇家化学学会杂志上。
碳化钨 (WC)：
森下教授专注于“碳化钨（WC），它具有类似的电子配置但不作为催化剂”作为铂的替代品。
当将钴纳米晶体添加到 WC 时，“现在可以以与铂相同的效率水平提取氢。”
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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