硫掺杂铁酸镍纳米片阵列增强水氧化

Haijun Liu, B. Dong
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引用次数: 0

摘要

工业水电解需要高活性和承载安培电流的析氧反应(OER)催化剂,但在现有的OER催化剂中,在低过电位下实现如此大的工作电流密度仍然是一个巨大的挑战。本文报道了一种在泡沫铁(S-NiFe2O4/IF)上垂直生长非金属改性镍铁氧体纳米片作为大电流密度OER催化剂的简单而传统的策略。垂直排列的纳米片阵列可以提供较大的电化学表面积,纳米阵列之间的间距可以允许有效的电解质进入活性位点。S的引入增强了OER对水的吸附和解离,优化了OER中间体的吸附。结果表明,S-NiFe2O4/IF表现出优异的OER活性,过电位分别为287和326 mV,分别达到100和500 mA cm−2,并且在碱性介质中表现出良好的稳定性。此外,本文开发的合成策略可以应用于其他具有类似自支撑土丰纳米阵列的混合过渡金属氧化物,用于能源相关反应的高级电催化。
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Sulphur doping of nickel ferrite nanosheet array for enhanced water oxidation
Industrial water electrolysis requires highly-active and ampere-current-bearing oxygen evolution reaction (OER) catalysts, but achieving such a large operating current density at low overpotentials in available OER catalysts still remains a grand challenge. Herein, we report a facile and conventional strategy to grow vertically non-metallic modified nickel ferrite nanosheets on Fe foam (S-NiFe2O4/IF) as largecurrent-density OER catalysts. The vertically aligned nanosheet arrays can offer large electrochemical surface area, and the spacing between nanoarrays can allow for effective electrolyte access to the active sites. The introduction of S enhanced the adsorption and dissociation to water and optimized the adsorption of OER intermediates. As a result, S-NiFe2O4/IF exhibits superior OER activity with an overpotential of 287 and 326 mV to achieve 100 and 500 mA cm−2, respectively, and displays robust stability in alkaline media. In addition, the synthesis strategy developed here can be applied to other mixed transition metal oxides with similar selfsupported earth-abundant nanoarrays for advanced electrocatalysis in energy-related reactions.
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来源期刊
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0.00%
发文量
342
审稿时长
6 weeks
期刊介绍: MATEC Web of Conferences is an Open Access publication series dedicated to archiving conference proceedings dealing with all fundamental and applied research aspects related to Materials science, Engineering and Chemistry. All engineering disciplines are covered by the aims and scope of the journal: civil, naval, mechanical, chemical, and electrical engineering as well as nanotechnology and metrology. The journal concerns also all materials in regard to their physical-chemical characterization, implementation, resistance in their environment… Other subdisciples of chemistry, such as analytical chemistry, petrochemistry, organic chemistry…, and even pharmacology, are also welcome. MATEC Web of Conferences offers a wide range of services from the organization of the submission of conference proceedings to the worldwide dissemination of the conference papers. It provides an efficient archiving solution, ensuring maximum exposure and wide indexing of scientific conference proceedings. Proceedings are published under the scientific responsibility of the conference editors.
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