Zeyi Wang , Shuling Liu , Jinyu Du , Yichuang Xing , Yanling Hu , Yujie Ma , Xinyi Lu , Chao Wang
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引用次数: 0
Abstract
Active and stable electrocatalysts for the oxygen evolution reaction (OER) are the key to producing hydrogen from alkaline water electrolysis. Here, iron-doped nickel phosphide grown on nickel foam ((Ni0.83Fe0.17)2P/NF) is synthesized by solvothermal phosphidization of NiFe-layered double hydroxides (LDHs) on NF with white phosphorus. (Ni0.83Fe0.17)2P consists of hollow nanospheres with diameters around 50 nm. For the OER in 1 M KOH, (Ni0.83Fe0.17)2P/NF requires low overpotentials of only 215 mV and 247 mV to reach current densities of 10 mA cm−2 and 50 mA cm−2, respectively, which are significantly lower than Ni2P/NF and most of the reported metal phosphide materials to date. The high OER activity of (Ni0.83Fe0.17)2P/NF is attributed to the improved intrinsic activity caused by electron interactions between Fe, Ni, and P, which tunes the adsorption energy of the hydroxyl groups, ultimately leading to more facile OER kinetics. The reduced charge transfer resistance, Tafel slope value, and apparent activation energy corroborate the facile kinetics in (Ni0.83Fe0.17)2P/NF. Both (Ni0.83Fe0.17)2P/NF and Ni2P/NF involve decoupled electron and proton transfer processes. (Ni0.83Fe0.17)2P/NF also displays good long-term durability, with the conversion of surface metal phosphides to oxides and (oxy)hydroxides observed after prolonged galvanostatic OER tests.
期刊介绍：
Green Chemistry is a journal that provides a unique forum for the publication of innovative research on the development of alternative green and sustainable technologies. The scope of Green Chemistry is based on the definition proposed by Anastas and Warner (Green Chemistry: Theory and Practice, P T Anastas and J C Warner, Oxford University Press, Oxford, 1998), which defines green chemistry as the utilisation of a set of principles that reduces or eliminates the use or generation of hazardous substances in the design, manufacture and application of chemical products. Green Chemistry aims to reduce the environmental impact of the chemical enterprise by developing a technology base that is inherently non-toxic to living things and the environment. The journal welcomes submissions on all aspects of research relating to this endeavor and publishes original and significant cutting-edge research that is likely to be of wide general appeal. For a work to be published, it must present a significant advance in green chemistry, including a comparison with existing methods and a demonstration of advantages over those methods.
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