Dr. CHEN Wei and CUI Ping, from International Center for Quantum Design of Functional Materials (ICQD) at Hefei National Laboratory for Physical Sciences at the Microscale, enhance the hydrogen activation reactivity of nonprecious metal via confined catalysis underneath graphene and thus predict that graphene-covered Ni would be perfect platform to produce hydrogen, with cooperation with peers from the University of Science and Technology of China (USTC), Harvard University, Wuhan University.
Hydrogen, as ideal clean energy, has received a lot of attention, with its prospect of mitigating energy crisis and environment pollution. However, in the hydrogen evolution reaction (HER), the precious metal Pt is the most efficient catalyst, since the reactivity as a function of the hydrogen adsorption energy on different metal substrates follows a well-known volcano curve, peaked at Pt. Therefore, turning nonprecious metals into efficient catalysts is a fundamental challenge.
This study provides a new perspective for economical production of hydrogen and other important chemical reactions of industrial significance, by integrating the concepts of marginal catalysis and confined catalysis. The findings demonstrate that graphene-covered Ni is an appealing effective, stable, and economical catalytic platform for HER.
Confined catalysis, proposed by research team led by Dr. BAO Xinhe at Dalian Institute Chemical Physics, Chinese Academy of Sciences, demonstrates significant advantage. In confined catalysis, the whole or parts of the catalyst, reactants and products are confined in a restricted space and then the reactivity is enhanced due to modification of the relevant electronic states by the boundary conditions.
USTC research team further put up marginal catalysis, where the reactivity is improved significantly. In marginal catalysis, researchers put a 2D overlayer on a nonprecious metal with moderate reactivity to introduce confined catalysis. Using density functional theory calculations, the team shows that when the hydrogen atom is at the interface between a graphene layer and different metals, its absorption free energy reduces to some extent, compared with that when without graphene. The highlight is that when the surface of Ni (111) is covered with graphene, hydrogen evolution reactivity has been adjusted to reach around the peak of the volcano curve. Thus, graphene-covered Ni becomes catalyst with high catalytic activity. At the same time, the diffusion rate of hydrogen remains high at the interface, ensuring the quick collection of products.
Figure. (a) Diagram of hydrogen evolution reaction catalyzed by graphene-covered N (b) Volcano curve of catalysis activity of different metals’ surface in HER with vdW (c) Anticipated volcano curve of catalysis activity of different metals’ surface, underneath a graphene layer.(Image by&ZHANG Zhenyu &&CUI Ping)
The work has been published on Nano Letters, entitled “” The co-first authors are ZHOU Yinong, a new bachelor degree holder from School of Physical Sciences at USTC, and Doctor CHEN Wei, a Mo-tse honored post-doctor from International Center for Quantum Design of Functional Materials (ICQD) at Hefei National Laboratory for Physical Sciences at the Microscale.
The research was sponsored by the National Natural Science Foundation of China, Chinese Academy of Sciences, Ministry of Science and Technology, Ministry of Education.
The link of the paper:
Corresponding author information:
Pro. ZHANG Zhenyu . &http://dsxt./zj_ywjs.asp?zzid=1564
Dr. CUI Ping E-mail: . &
(International Center for Quantum Design of Functional Materials (ICQD), Hefei National Laboratory for Physical Sciences at the Microscale, Synergetic Innovation Center of Quantum Information and Quantum Physics, Research Department, USTC News Center)
On May 11, the Nature Publishing Group released Nature Publishing Index 2010 China, remarking “a dramatic rise in the quality of research being published by China”. University of Science and Technology of China is ranked 3rd of TOP 10 Institutions in Index 2010 China.
This article came from News Center of USTC.【学术报告】：Perfect Matchings in Matching-Covered Graphs
Perfect Matchings in Matching-Covered Graphs
15:00——16:30
数学院304报告厅
主讲人姓名
(国籍) 工作单位
美国 中田纳西州立大学
主讲人简介
叶东，中田纳西州立大学数学与计算科学系助理教授，于兰州大学获学士学位，于美国西弗吉尼亚大学数学系获博士学位，师从著名图论专家张存铨教授。主要研究方向为图论和组合，尤其在匹配、圈覆盖及图的代数性质方面做出突出工作。目前在图论及组合主流期刊发表30余篇论文，其中包括Combinatorica, Discrete & Computational Geometry, SIAM Journal on Discrete Mathematics等顶级期刊。
报告内容简介
Let G be a matching-covered graph, i.e., every edge is contained in a perfect matching. An edge subset X of G is feasible if there exists two perfect matchings M1 and M2 such that |M1∩X|not ≡ |M2∩X| mod 2. Lukot'ka and Rollová proved that an edge subset X of a regular bipartite graph is not feasible if and only if X is switching-equivalent to ?, and they further ask whether a non-feasible set of a regular graph of class 1 is always switching-equivalent to either ? or E(G)? Two edges of G are equivalent to each other if a perfect matching M of G either contains both of them or contains none of them. An equivalent class of G is an edge subset K with at least two edges such that the edges of K are mutually equivalent. An equivalent class is not a feasible set. Lovász proved that an equivalent class of a brick has size 2. In this talk, we show that, for every integer k ≥ 3, there exist infinitely many k-regular graphs of class 1 with an arbitrarily large equivalent class K such that K is not switching-equivalent to either ? or E(G), which settles the problem proposed by Lukot'ka and Rollová. Further, we characterize bipartite graphs with equivalent class, and characterize matching-covered bipartite graphs of which every edge is removable. This is joint work with He, Wei and Zhai.
数学与统计学院
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