Lixiang He , Ni Wang , Mingliang Xiang , Li Zhong , Sridhar Komarneni , Wencheng Hu
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引用次数: 0
Abstract
The oxygen evolution reaction (OER) is regarded as a critical component in the water splitting system. Creating vacancies, increasing active surface area, and optimizing electronic structure would improve electrocatalytic performance. Herein, a facile electrochemical reduction method is used to generate sulfur vacancies in nickel iron sulfide (NiFe-S) with a large geometry area of 15 × 16 cm2, which is synthesized using an electrodeposition process assisted with the ion exchange (IOE) method. The X-ray absorption spectroscopies (XAS) are applied for atomic-level structural analysis, verifying that electrochemical desulfurization generates abundant S vacancies. The NiFe-S with abundant sulfur vacancies (NiFe-S-Vs) exhibits a low overpotential (252 mV at 100 mA cm−2), and long stability for 260 h at 500 mA cm−2. More importantly, the NiFe-S-Vs catalyst also delivers a small overpotential (235 mV at 1000 mA cm−2) and high alkaline tolerance (140 h at 500 mA cm−2) in 6 M KOH at 60 °C), implying a potentially significant industrial application prospect. Finally, theory calculation further illustrates the high performance of as-prepared vacancies-rich catalyst.
氧进化反应(OER)被认为是水分离系统中的一个关键组成部分。创造空位、增加活性表面积和优化电子结构将提高电催化性能。本文采用一种简便的电化学还原法在硫化镍铁(NiFe-S)中产生硫空位,该硫化镍铁是利用电沉积工艺和离子交换(IOE)法合成的,具有 15×16 cm2 的大几何面积。利用 X 射线吸收光谱(XAS)进行原子级结构分析,验证了电化学脱硫会产生大量的 S 空位。具有丰富硫空位的 NiFe-S(NiFe-S-Vs)具有较低的过电位(100 mA cm-2 时为 252 mV),并且在 500 mA cm-2 下具有 260 小时的长期稳定性。更重要的是,NiFe-S-Vs 催化剂还具有较小的过电位(1000 mA cm-2 时为 235 mV)和较高的耐碱性(在 60 °C 的 6 M KOH 溶液中,500 mA cm-2 时为 140 h),这意味着其具有巨大的工业应用前景。最后,理论计算进一步说明了制备的富空位催化剂的高性能。
期刊介绍:
Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including:
1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources.
2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes.
3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts.
4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells.
5.Catalytic reactions that convert wastes into useful products.
6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts.
7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems.
8.New catalytic combustion technologies and catalysts.
9.New catalytic non-enzymatic transformations of biomass components.
The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.