From University of Science and Technology of China [中国科学技术大学 Zhōngguó kēxué jìshù dàxué](CN) via phys.org: “Building bridges between atoms and making catalysts of high quality”

From University of Science and Technology of China [中国科学技术大学 Zhōngguó kēxué jìshù dàxué](CN)

via


phys.org

February 25, 2021
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Credit: CC0 Public Domain

Similar to the fact that a person would act differently when being alone, materials can also obtain unique qualities when being separated in atom-level, among which is the enhanced catalyzing ability.

Single-atom catalysts have shown enormous catalyzing capability since its first appearance. By preparing 2-dimensional (2-D) single-atom monolayer crystals, scientists can expect to get catalysts with high loading density of active sites as well as great stability. However, the question herein is that only the edge atoms in the 2-D monolayer have shown this effect while most of the atoms are inside the basal plane, which is critically limiting the efficiency of catalysts in this form.

In a new study published in Angewandte Chemie International Edition, Prof. YAN Wensheng’s team from the National Synchrotron Radiation Laboratory of the University of Science and Technology of China [中国科学技术大学 Zhōngguó kēxué jìshù dàxué](CN) of the Chinese Academy of Sciences [中国科学院](CN), and the collaborators, established bridges between atoms and made catalysts of high quality.

What the scientists did is to apply the substitutional doping method of magnetic Co ions to prepare samples of Co-doping MoS2 monolayer, denoted as Co-MoS2, and then characterize and examine its catalyzing effect on electrochemical hydrogen evolution reaction (HER).

The doped Co ions act as bridges between sulfate atoms, connecting S atoms in the edge region and basal plane and thus, inducing ferromagnetic ordering in Co-MoS2. The highly mixed electron pattern between Co and S atoms enables the S inside the plane to become active sites during the catalyzing procedure.

They conducted experiments to confirm a dramatically increased exchange current density during HER in acid electrolyte, suggesting the greatly enhanced electrical catalyzing effect of MoS2 compared with former results.

This study can be generalized to other 2-D monolayers which could be developed as single-atom-layer catalysts by arousing the originally inert basal plane atoms via manipulating the ferromagnetism. Like magicians of processing, these catalysts can change how reactions operate.

See the full article here.

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The University of Science and Technology of China [中国科学技术大学 Zhōngguó kēxué jìshù dàxué](CN) is a national research university in Hefei, Anhui, China, under the direct leadership of the Chinese Academy of Sciences [中国科学院](CN). It is a member of the C9 League, China’s equivalent of the Ivy League. It is also a Chinese Ministry of Education Class A Double First Class University. Founded in Beijing by the CAS in September 1958, it was moved to Hefei in the beginning of 1970 during the Cultural Revolution.

USTC was founded with the mission of addressing urgent needs to improve China’s economy, defense infrastructure, and science and technology education. Its core strength is scientific and technological research, and more recently has expanded into humanities and management with a strong scientific and engineering emphasis. USTC has 12 schools, 30 departments, the Special Class for the Gifted Young, the Experimental Class for Teaching Reform, Graduate Schools (Hefei, Shanghai, Suzhou), a Software School, a School of Network Education, and a School of Continuing Education. In 2012 the Institute of Advanced Technology, University of Science and Technology of China was founded.

USTC was founded in Beijing by the Chinese Academy of Sciences (CAS) in September 1958. The Director of CAS, Mr. Guo Moruo was appointed the first president of USTC. USTC’s founding mission was to develop a high-level science and technology workforce, as deemed critical for development of China’s economy, defense, and science and technology education. The establishment was hailed as “A Major Event in the History of Chinese Education and Science.” CAS has supported USTC by combining most of its institutes with the departments of the university. USTC is listed in the top 16 national key universities, becoming the youngest national key university.

In 1969, during the Cultural Revolution, USTC was moved to Anhui province and eventually settled in Hefei in 1970.

USTC set up the Special Class for the Gifted Young and the first graduate school in China in 1978. The campus for graduate study in Hefei was established in 1986. Original campus for graduate study in Beijing was later renamed the Graduate School of the CAS in 2001 and University of Chinese Academy of Sciences in 2012.

In 1995, USTC was amongst the first batch of universities obtaining support through the National 9th Five-Year Plan and the “Project 211”. In 1999, USTC was singled out as one of the 9 universities enjoying priority support from the nation’s “Plan of Vitalizing Education Action Geared to the 21st Century”. Since September 2002, USTC has been implementing its “Project 211” construction during the 10th National Development Plan.