An important progress has been achieved

With the increasing exhaustion of fossil energy and the worsening environment, the development and utilization of renewable energy have attracted widespread attention worldwide. Among the many renewable energy sources, hydrogen energy has the advantages of high energy density and zero -temperature room gas emissions, and is considered one of the most potential energy sources to replace traditional fossil fuels. The use of electrical energy generated by renewable energy such as wind energy, solar energy, and tidal energy to prepare high -pure hydrogen for electrolytic water is the most efficient and green hydrogen production path. The key core technologies to realize the hydrogen production of industrial scale are the preparation of high -efficiency and low -cost electro -catalysts. To this end, in the past few decades, a large number of research work has been used to develop high -efficiency electrocatalyst hydrogen analysis catalysts to reduce hydrogen analysis of the potential and increase the charging rate of electrode interface.

Platinum (PT) base catalyst has a significant advantage of hydrogen analysis and high exchange current density. It is considered to be the best catalytic material for hydrogen analysis. However, PT is a rare precious metal, which is expensive and scarce, which greatly limits the industrial application of PT -based catalysts. Carbon nanotubes have excellent conductivity, mechanical strength and chemical stability, and are considered an excellent carrier of electrocatalyst. Combining the electro -catalytic hydrogen analysis performance with excellent carbon nanotubes with the excellent PT -based catalyst, which can be expected to have excellent catalytic performance in the hydrogen analysis reaction in the hydrogen analysis. At present, the preparing carbon nanot barrel load that is evenly dispersed with the nano -PT cluster catalyst is a very challenging research work.

Based on this, the team of researcher Zhang Zhongguo and the associate researcher of Han Junxing's associate researcher in the Institute of Resources and Environment of the Beijing Institute of Science and Technology recently used N and P co-doped carbon nanotubes (N and P CO-DOPED Carbon Nanotubes, NP-CNTS) as a carrier. The impregnation and high-temperature thermal treatment technology under the protection of inert atmosphere prepare the precious metal PT nano-cluster catalyst (PT/NP-CNTS) of the precious metal PT nano-nano-nanoplasty cluster on the carbon nanotonal tube, as shown in Figure 1. Through XRD, RAMAN, XPS, HAADF -TM, EDS MAPPING, ICP-AES and other technologies, the structure of PT/NP-CNTS catalysts, PT nano-cluster particles, PT oxidation state, N element key type, P element key combination type The important core information such as element distribution was analyzed and characterized, and the results showed that the prepared catalysts were evenly mixed with N and P elements on the surface C defects of the carbon nanotuba, forming a large number of sites suitable for PT forearm adsorption, for the PT front -drive adsorption, for it, for the PT front -drives, for the PT front -drives, for the PT front drive adsorption, for it, for the PT front -wheel drive adsorption, for it, for the PT front -wheel drive adsorption. The formation of PT nanow clusters provides a "riveting" bit; in the PT/NP-CNTS catalyst obtained, the particle size of the PT nanow cluster is about 0.65 nm, and the load is about 1.4WT%, as shown in Figure 1.

Figure 1 (a) PT/NP-CNTS catalyst preparation process schematic diagram; (B), (C), (d): scan electron microscope, energy spectrum and transmitted electro mirror diagram of PT/NP-CNTS catalysts

In acidic electrolytes, PT/NP-CNTS shows extremely excellent electro-catalytic hydrogen hydrogen response performance: starting potential, η10 potential, TAFEL slope, stability and other important performance indicators are better than commercial precious metal PT/C catalysts. As shown in Figure 2A, the NP-CNTS carrier of the non-load PT nanometer has almost no hydrogen analysis of the hydrogen analysis, and after the load PT nanometer cluster, the CV curve has obvious hydrogen output peaks, which further combines the XPS price attitude characteristics and electrochemical activity activity, electrochemical activity activity Surface area test proves that the zero -price PT nano -cluster of the carbon nanotuba surface is the activity of the electrocatalytic hydrogen hydrogen response. As shown in Figure 2B and 2C, the hydrogen response on the PT/NP-CNTS catalyst reaches the hydrogen reaction of 10mA CM-2 (η10) at a transition of 25MV (vs. Rhe), and the corresponding TAFEL slope is 28mv DEC-1 , Both are lower than the commercial PT/C catalyst (29mv, 29mv DEC-1) and the vast majority of electrocatalyst hydrogen catalysts (Figure 2D) reported in the current literature. The Tafel slope of hydrogen reaction on PT/NP-CNTS catalyst is close to 30mv DEC-1, indicating that the hydrogen reaction of hydrogen analysis on the PT/NP-CNTS catalyst follows the Volmer-TAFEL mechanism, that is, the H*re-combining H-H of the chemical adsorption state is the reaction. Fast -control step (RDS).

Figure 2 PT/NP-CNTS catalyst catalysts in acidic electrolysis hydrogen analysis test results

In addition to catalytic activity, stability is another important indicator to examine the performance of catalysts. As shown in Figure 2F, after 20 hours of running under the potential of 10mA CM-2, the hydrogen analysis of the commercial PT/C catalyst decreases to 9.3mA CM-2, a decrease of 7%; and after 20 hours, PT/NP- The hydrogen analysis of the CNTS catalyst is 9.8mA CM-2, which has only decreased by 2%, indicating that the PT/NP-CNTS catalyst has better stability. As shown in Figure 2G, from the TEM diagram of the catalyst after use, it can be seen that after running 20 hours, the PT nano -cluster is still evenly distributed on the surface of the carbon nanotuba. The N and P sites doped on the surface of the pipe not only provide the PT front drive adsorption site for the synthesis of PT nano -clusters, but also can be used as the "riveting" site to inhibit the migration and migration and migration of PT nano clusters on the surface of the carbon nanopotranskin surface. Reunion to ensure the excellent stability of PT/NP-CNTS catalysts. This study provides an important research path for the design and development of hydrogen catalysts for high -efficiency and low -cost PT basis, and provides theoretical support for the realization of large -scale high -purity green hydrogen energy industrialization production. Figure 3 Thesis publishing journals, questions, authors and other related information

This work is published in Journal of Materials Chemistry A (if = 14.5/q1). Associate Researcher Han Junxing and researcher Zhang Zhongguo are the author of this paper. This work has been funded by the "North Science and Technology Young Scholar Plan" of the Beijing Institute of Science and Technology. ), The latter is a potential electrocatalytic oxygen analysis (OER) catalyst.

(Han Junxingwen/Picture)

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