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Advanced energy materials: amorphous / crystalline heterogeneous co-v-fe (o) hydroxides for efficient oxygen evolution

wallpapers News 2020-07-10
The increasing energy consumption of

the challenge of global warming have prompted people to explore various new energy conversion storage devices (such as electrocatalytic water decomposition to produce clean energy H2 molecule). Among all kinds of energy conversion storage devices oxygen evolution reaction (OER) plays an important role. However oer is a four electron coupling reaction. The reaction process involves multiple intermediate states (such as * Oh ooh * o *) needs to combine multiple protons which often shows slow dynamic characteristics. Therefore the reaction rate of oer largely determines the properties of energy conversion storage devices. IR Ru based materials are usually used in oer catalysts but the low reserves high cost of these precious metals limit their large-scale commercial use. Therefore the development of alternative cheap efficient oer catalysts is the key factor to realize the wide application of new energy conversion storage devices.

recently Professor Yan Qingyu Professor Liu Bin of Nanyang University of technology associate professor Hao Xiaodong of Shaanxi University of science technology published the research work entitled "ammonia / crystalline heterostructured cobalt ‐ vanadium ‐ iron (oxy) hydroxides for highly efficient oxygen evolution reaction" in the international journal advanced energy materials. In this work we report a cation exchange method to prepare amorphous / crystalline co-v-fe (o) hydroxide nanosheets. The nano catalyst has the optimal binding energy for oer intermediates. The formation of amorphous / crystalline heterogeneous structure in the catalyst increases the exposure of active sites. In addition the synergistic effect of cobalt vanadium iron cations in the catalyst regulates its local coordination environment electronic structure which makes the nano catalyst have the best thermodynamic barrier for the basic reaction steps of oer. Based on this the optimal cov-fe0.28 catalyst exhibited excellent electrocatalytic activity for oer: the current density of 10 macm-2 only required 215 MV overpotential small Tafel slope (39.1 MV · dec-1) which was better than commercial ruthenium dioxide (321 MV 86.2 MV · dec-1 respectively).

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