Self-Supportive Bimetallic Selenide Heteronanostructures as High-Efficiency Electro(pre)catalysts for Water Oxidation,ACS Sustainable Chemistry & Engineering

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Self-Supportive Bimetallic Selenide Heteronanostructures as High-Efficiency Electro(pre)catalysts for Water Oxidation
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-09-13 , DOI: 10.1021/acssuschemeng.1c05728
Ranjith Bose _{1,

2} , K. Karuppasamy ₃ , Paulraj Arunkumar ₄ , Ganesh Kumar Veerasubramani ₅ , Sampath Gayathri ₄ , P. Santhoshkumar ₆ , Dhanasekaran Vikraman ₃ , Jong Hun Han ₄ , Hyun-Seok Kim ₃ , Akram Alfantazi _{1,

2}

Affiliation

Developing oxygen evolution reaction (OER) catalysts is intricate and challenging, involving a four-electron transport process coupled with conversion of O–H bonds into O–O bonds. This paper proposes a simple one-step synthetic strategy for preparing self-supported Cu₂Se/NiSe₂ heteronanostructure electrodes for the OER with well-defined heterointerfaces by directly embedding onto the conductive nickel foam substrate. The prepared catalyst significantly enhances OER activity with low overpotentials of 277 and 290 mV at current densities of 50 and 100 mA cm^–2, respectively, which is attributed to electronic structure modulation by synergetic interactions and enhanced charge transportation between Cu₂Se and NiSe₂ nanostructures. The as-prepared electrodes achieved high durability in 1 M KOH, retaining initial activity levels after 24 h continuous operation. We performed comprehensive spectroscopic and microscopic characterization before and after the OER to clarify active species and relate them to OER catalysis. Enhanced catalyst efficiency arises from integrating multicomponent electrocatalytic systems, which has been emphasized by the present findings.

中文翻译：

自支撑双金属硒化物异质结构作为水氧化的高效电（预）催化剂

开发析氧反应 (OER) 催化剂复杂且具有挑战性，涉及四电子传输过程以及 O-H 键向 O-O 键的转化。本文提出了一种简单的一步合成策略，用于通过直接嵌入到导电泡沫镍基板上来制备用于具有明确异质界面的 OER 的自支撑 Cu ₂ Se/NiSe ₂异质结构电极。所制备的催化剂在电流密度为 50 和 100 mA cm ^–2时分别具有 277 和 290 mV 的低过电位，显着提高了 OER 活性，这归因于通过协同相互作用和增强的 Cu ₂ Se 和 NiSe ₂之间的电荷传输进行的电子结构调制纳米结构。所制备的电极在 1 M KOH 中具有高耐久性，在连续运行 24 小时后仍保持初始活性水平。我们在 OER 之前和之后进行了全面的光谱和微观表征，以阐明活性物质并将它们与 OER 催化联系起来。增强的催化剂效率源于集成多组分电催化系统，本研究结果强调了这一点。

更新日期：2021-09-27

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