Partial Selenization Strategy for Fabrication of Ni0.85Se@NiCr-LDH Heterostructure as an Efficient Bifunctional Electrocatalyst for Overall Water Splitting

IF 13 2区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Small Pub Date : 2024-11-13 DOI:10.1002/smll.202407538

Nitika, R.K. Dutta

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引用次数: 0

Abstract

NiCr-LDH and its partial selenization as Ni_0.85Se@NiCr-LDH heterostructure is established here as an alkaline water electrolyzer for achieving enhanced overall water splitting efficiency. The hydrothermally synthesized optimized batch of Ni_0.85Se@NiCr-LDH is thoroughly characterized to elucidate its structure, morphology, and composition. Compared to pristine NiCr-LDH, the batch of Ni_0.85Se@NiCr-LDH exhibits exceptional alkaline OER and HER activity with low overpotentials of 258 and 85 mV at 10 mA cm⁻², respectively. Besides, Ni_0.85Se@NiCr-LDH also exhibits excellent acidic HER with an overpotential of only 61 mV at 10 mA cm⁻², indicating that Ni_0.85Se@NiCr-LDH can operate effectively across a wide pH range. The excellent electrochemical stability of Ni_0.85Se@NiCr-LDH for 24 h operation is attributed to the formation of a thin layer of SeO_x during OER operation. The role of selenization and the effect of Cr in the LDH lattice toward enhanced electrocatalytic water splitting is discussed. The outstanding OER and HER performances of Ni_0.85Se@NiCr-LDH are attributed to the higher electrochemical active surface area, favorable conditions for adsorption of HER/OER intermediates, low charge transfer resistance, and improved conductivity. The practical application of Ni_0.85Se@NiCr-LDH as a bifunctional electrocatalyst for overall water splitting is reflected from the low cell voltage of 1.548 V at 10 mA cm⁻².

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采用部分硒化策略制备 Ni0.85Se@NiCr-LDH 异质结构作为高效的整体水分离双功能电催化剂

本文将镍铬-LDH 及其部分硒化为 Ni0.85Se@NiCr-LDH 异质结构作为碱性水电解槽，以实现更高的整体水分离效率。通过对水热合成的优化批次 Ni0.85Se@NiCr-LDH 进行全面表征，阐明了其结构、形态和组成。与原始 NiCr-LDH 相比，该批 Ni0.85Se@NiCr-LDH 表现出优异的碱性 OER 和 HER 活性，在 10 mA cm-2 条件下，过电位分别为 258 和 85 mV。此外，Ni0.85Se@NiCr-LDH 还表现出优异的酸性 HER 性能，在 10 mA cm-2 时过电位仅为 61 mV，这表明 Ni0.85Se@NiCr-LDH 可以在很宽的 pH 值范围内有效工作。Ni0.85Se@NiCr-LDH 可在 24 小时内保持极佳的电化学稳定性，这归功于在 OER 运行过程中形成了一层薄薄的 SeOx。讨论了硒化的作用和 LDH 晶格中铬对增强电催化水分离的影响。Ni0.85Se@NiCr-LDH 杰出的 OER 和 HER 性能归功于其较高的电化学活性表面积、HER/OER 中间体的有利吸附条件、较低的电荷转移电阻和较高的电导率。Ni0.85Se@NiCr-LDH 作为一种用于整体水分离的双功能电催化剂，在 10 mA cm-2 时的电池电压低至 1.548 V，这反映了它的实际应用价值。

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来源期刊

Small 工程技术-材料科学：综合

CiteScore

17.70

自引率

3.80%

发文量

1830

审稿时长

2.1 months

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