Recently, the Chinese Academy of Sciences Institute of Solid State Physics, Institute of Solid State Physics Micro Devices and Devices Li Yue research group made progress in the construction and application of electrode materials for electrocatalytic hydrogen evolution, the relevant research results published in Nanoscale, the article was Selected for the current Inside back cover.
Hydrogen as a non-polluting ecological clean energy, much attention.Electrolysis water hydrogen is an important means to achieve industrialization, cheap preparation of hydrogen.Improved industrialization of electrolysis of water hydrogen is to obtain a high catalytic activity of the electrocatalytic hydrogen evolution electrode material It is well-known that noble metal-based catalysts represented by platinum have the highest electrolysis water hydrogen production efficiency under electrocatalytic conditions, however, their high price and scarce reserves have hindered their large-scale industrialization, and therefore, the development of catalysts with high catalytic performance Of non-precious metal catalyst to replace the precious metal catalyst for the realization of large-scale electrolysis of hydrogen water has important practical significance and a wide range of applications.
Among the many non-precious metal hydrogen evolution catalysts, transition metal phosphides have drawn much attention because of their low cost and high electrocatalytic activity for hydrogen evolution.In particular, the use of molybdenum (Mo), cobalt (Co), nickel (Ni) Due to the regulation of the electronic structure of the phosphide by the doping elements, the adsorption of hydrogen atoms on the surface of the solid catalyst is decreased, so that the hydrogen evolution performance of the three-dimensional nano-array catalyst prepared by miscellaneous phosphides is comparable to that of platinum. However, The catalytic activity of the non-noble metal catalyst is greatly influenced by the pH environment in which it is applied, and the stability of the non-noble metal catalyst needs to be further improved.
In view of this, Li Yue group using NiMoO4 nanowires as precursors, after the subsequent annealing phosphating process, to achieve Mo-doped Ni2P three-dimensional nano-array preparation of the Mo-Ni2P nanowire array electrocatalyst in different pH environment (Acidic, neutral, basic) all have excellent electrocatalytic activity. The current densities required to reach a current density of 10 mA / cm2 in electrolyte solutions of pH 0, 7, and 14 require an overpotential of 64, 84 and 78 mV, respectively 2), indicating that the catalyst system has high electrocatalytic activity over a wide pH range and that the catalyst system has high electrochemical stability over the entire pH range.The preparation of the Mo-Ni2P nanowire array electrocatalyst , Will provide a new way for the design and application of novel, efficient, stable and cheap non-noble metal hydrogen evolution electrocatalysts.
The research work has been funded by the Chinese Academy of Sciences cross-team project and the National Natural Science Foundation.
Figure 1. Moo Ni2P three-dimensional nanowire array within the full pH range electrolysis of hydrogen production within the schematic diagram of the cover.
Figure 2. Moo-Ni2P three-dimensional nanowire arrays in (a) acidic; (b) neutral; (c) linear sweep voltammetry under alkaline conditions.
