Changgan Lai , Zhiliang Guo , Liu Nie , Donghuai Zhang , Fajun Li , Shuai Ji
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引用次数: 1
摘要
开发高效、耐用、非贵重的水分解电催化剂是实现高效可再生能源转化的关键。镍铁层状双氢氧化物(NiFe-LDH)材料具有良好的催化性能,但受到活性位点稀缺和导电性差的限制。在此,我们报道了一系列通过S/N共掺杂构建的具有丰富活性位点的扩展层间距的nfe - ldh基材料,作为氧和氢析出反应(OER和HER)的高效双功能电催化剂。实验结果表明,在NiFe-LDH的层间结构上插入/修饰可以有效地降低能垒,加快反应动力学。结合结构优势,包括扩展的晶格间距和暴露的活性表面位点,所得到的S-N/NiFe-LDH锚定在泡沫镍(NF)中,在100 mA cm - 2的电流密度下驱动碱性电解槽电压为1.67 V,并且在100小时内具有强大的稳定性,这远远优于最先进的Pt/C-RuO2电催化剂。
Sulphur- and nitrogen-codoped layered double hydroxides with expanded interlayer distance for enhanced overall water splitting
Developing highly active, durable, and non-noble electrocatalysts for water-splitting is critical for efficient renewable energy conversion. Nickel-iron layered double-hydroxide (NiFe-LDH) materials show potential in achieving good catalytic performance, however, which was restricted by the scarce active sites and poor conductivity. Herein, we report a series of NiFe-LDH-based materials of expanded interlayer spacing constructed through S/N co-doping with rich active sites, used as a high-efficient bifunctional electrocatalyst for the oxygen and hydrogen evolution reactions (OER and HER). The experimental results indicate that the intercalation/decoration on the interlayer structure of NiFe-LDH can efficiently reduce the energy barrier and accelerate reaction kinetics. Combining with the structural advantages, including the expanded lattice spacing and exposed active surface sites, the resulting S-N/NiFe-LDH anchored in nickel foam (NF) drives an alkaline electrolyzer with a cell voltage of 1.67 V at a current density of 100 mA cm−2, as well as robust stability over 100 h, which is much superior to the state-of-the-art Pt/C-RuO2 electrocatalysts.
期刊介绍:
The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied.
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