Domestic scientists construct a kinetic reduction strategy for the reduction of electrocatalytic water decomposition reactions
As a new energy source, hydrogen energy has high energy density, abundant reserves, and no pollution to the environment. It has attracted great attention. Hydrogen evolution reaction (HER) has attracted much attention as a hydrogen production method that can cleanly and continuously utilize the abundant water resources on Earth. The development of high-efficiency and high-stability electrode catalysts based on low-cost, low turn-on voltages and low Tafel slopes for transitional base metals is the first and foremost problem in the research and application of electrocatalytic water splitting. On May 8th, Nano Energy, an internationally renowned journal in the field of new energy (influence factor 11.55 in 2016), published the team's latest research results on the cooperative mechanism for reducing the kinetic barriers in the electrocatalytic water splitting reaction. The paper is titled "Interface Engineering: the Ni(OH)2/MoS2 Heterostructure for Highly Efficient Alkaline Hydrogen Evolution". The team designed a Ni(OH)2/MoS2 heterostructure that uses its synergistic interfacial effect to significantly reduce the slow kinetic barriers that prevail in the alkaline hydrogen evolution reaction and exhibits excellent electrocatalytic hydrogen evolution activity. Further theoretical calculations explain the synergistic effect between MoS2 and Ni(OH)2 from the mechanism, and the interface bicomponent completes the different steps in the hydrogen evolution reaction, effectively bypassing the slow reaction of MoS2 to water decomposition in alkaline hydrogen evolution. The steps greatly accelerate the alkaline hydrogen evolution reaction process. The reviewers gave a high evaluation of this work. Dr. Zhang Baowei was the first author, and Professor Jiang Jianjun and Associate Professor Yan Ling were co-corresponding authors. Ph.D. students Liu Jia and Wang Jinsong participated in the related work of the paper. The electrocatalytic water decomposition includes the two reactions of hydrogen evolution and oxygen evolution. The improvement of total decomposition voltage requires the co-optimization of hydrogen evolution and oxygen evolution electrode properties. In another work result published in April, the team constructed a three-dimensional composite structure of NiCo2S4 nanotubes and NiFe sheets, which can effectively improve both the hydrogen evolution and oxygen evolution reaction processes at the same time using the interfacial synergistic effect. Under the condition that it exhibits excellent double-function electrolyzed water catalytic activity, only a total decomposition voltage of 1.6 V can reach a decomposition current of 10 mA/cm2. The study was published in ACS Applied Materials & Interfaces, 2017, 9(18): 15364–15372. Impact factor 7.145. Dr. Liu Jia was the first author, Prof. Jianjun Jiang and Prof. Qiao Ling were co-authors. Ph.D. students Wang Jinsong and Zhang Bao participated in the related work of the paper. Material genomic technology has a tremendous impetus for the development of new materials. Material calculation and analysis based on density functional theory and molecular dynamics methods can greatly deepen the understanding of the microscopic mechanism of reaction, and related research is on the rise in China. The team, under the guidance of Prof. Jianjun Jiang and Prof. Ying Ling, combined the first-principles calculations to obtain the structure-activity relationship of the HER process of two-dimensional transition metal sulfides (TMDs) to guide the optimization of their catalytic activity. In the work published in March 2017, doctoral student Wang Jinsong et al systematically studied the electrochemical hydrogen evolution reaction activity of TMDs. Studies have shown that the hydrogen evolution activity of TMDs is related to the electron affinity of the materials. Using this structure-activity relationship, a doped TMDs catalyst material designed for high HER activity was directed (Phys. Chem. Chem. Phys., 2017, 19: 10125-10132). In the results published in April, PhD student Chen Chi and colleagues studied the electrochemical activity of different β-phase MnO2 crystal planes, and proposed that a large number of highly electrochemically active (001) crystal planes can be prepared through F-ion pair crystal plane control. Effectively improve its electrochemical performance (ACS Applied Materials & Interfaces, 2017, 9 (17): 15176–15181). Prof. Jianjun Jiang has conducted a series of theoretical and experimental researches in the field of electrochemical energy storage and energy conversion since 2012. He has published more than 60 high-level papers and has received high attention from researchers at home and abroad. He has drawn close attention. Thousands. At present, two results have become hot papers (Hot paper, ESI ranked first 0.1%) and five papers have become high cited papers (High cited paper, ESI ranked first 1%). Among them, Dr. Chen Haichao, winner of the Hubei Provincial Outstanding Doctoral Dissertation Award in 2015, used a simple two-step hydrothermal method to successfully prepare a nickel-cobalt sulfide electrode material with high conductivity sea urchins, which is used to synthesize other special structures. Sulfides provide new ideas (Nanoscale, 2013, 5, 8879-8883, cited 257 times). Dr. Wan Houzhe prepared a porous nickel-cobalt-sulfur nanotubes electrode material using a sacrificial template method. Due to its high electronic conductivity and high ion diffusion channels, he demonstrated excellent electrochemical energy storage properties (CrystEngComm 2013, 15: 7649-7651, Cited 130 times). Doctoral students Ji Xiao, Xu Kui, Chen Chi, etc. combined with first-principles calculations and molecular dynamics methods systematically studied the energy storage mechanism of electrode materials for supercapacitors (J. Mater. Chem. A, 3: 9909-9914, 2015 Electrochimica Acta, 196: 75, 2016). The team was invited to publish a review entitled Nanostructured Ni compounds as electrode materials towards high-performance electrochemical capacitors in the direction of Ni-based nanostructured electrochemical capacitor electrode materials (J. Mater. Chem. A, 2016, 4, 14509-14538). . Professor Jiang Jianjun’s team has also conducted extensive cooperation with several well-known groups at home and abroad in related fields, including Energy Environ. Sci. (9: 2586, 2016), Nano Lett (15: 4692, 2015), Advanced Energy Materials (6: 1501929). , 2016), Nano Energy (12: 386, 2015; 12: 386, 2015; 11: 226, 2015) and other top journals in the energy and nano fields published related work. Three Ph.D. students were awarded with funding from the National Student Scholarship Fund, and were jointly trained in internationally renowned research groups to pursue a degree. The series of related work has won the support of a number of National Natural Science Foundation and Wuhan City Science and Technology Application Project. (Correspondence Ling Ling) Welding Machine,Welding Equipment,Miller Welding Machines,Plasma Welding Machines Ebic Tools Limited , http://www.ebictools.com
