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	Enhancing the energetic and magnetic stability of atomic hydrogen chemisorbed on graphene using (non)compensated B-N pairs
	Chen, Zhengyan1; Wang, Sanjun2; Xiong, Wen3; Wang, Fei4
	2024-04-29
摘要	In this pioneering study for identifying atomic scale magnetic moment, a single hydrogen atom chemisorbed on pristine graphene exhibits distinct spin polarization. Using first-principles calculations and analyses, we demonstrate that the binding between a H adsorbate and a C substrate is substantially enhanced via compensated B-N pairs embedded into graphene. Surprisingly, the interaction can be further enhanced via non-compensated B-N pair doping. Our established prototype of orbital intercoupling between H 1s and hybridized pz of gapped band edges gives an insight into the enhancing mechanism. For compensated B-N doping, the conduction band minimum (CBM) is pushed upward, which induces stronger interaction between the H 1s and hybridized pz orbitals of the CBM. For non-compensated B-N doping, the orbital interaction occurs between H 1s and hybridized pz orbitals of valence band maximum, thus further lowering the resulting bonding energy due to the enlarged gap. This significantly enhanced interaction between H and C atoms agrees well with the results of charge localization at the gapped band edges. More importantly, the corresponding magnetic moments can be well maintained or even enhanced in both doping; here, one more H atom is needed for non-compensated doping, where its electron occupies the empty CBM. Our findings might provide an effective and practical way to enhance the energetic and magnetic stability of atomic scale magnetic moment on graphene and extensively expand the conception of non-compensated doping. Both compensated and non-compensated doping lead to localized band edges of graphene. The binding between the H atom and doped graphene is substantially enhanced, and the atomic scale magnetic moment is well maintained.
DOI	10.1039/d4cp00923a
发表期刊	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
ISSN	1463-9076
页码	9
通讯作者	Wang, Fei(wfei@zzu.edu.cn)
收录类别	SCI
WOS记录号	WOS:001209187600001
语种	英语