Design and development of carbon nanotube-integrated cobalt phosphate (CoP2O6/CNT) composite via a solid-state strategy for enhanced bi-functional electrocatalytic performance in oxygen and urea oxidation reactions

IF 6.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Surfaces and Interfaces Pub Date : 2025-09-24 DOI:10.1016/j.surfin.2025.107723

Bodicherla Naresh , T.V.M. Sreekanth , Chandra Reddy Neeragatti Suma , Kummara Sunil Kumar , Kisoo Yoo , Jonghoon Kim

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Abstract

Cobalt phosphate (CoP₂O₆) and its carbon nanotube-based composite (CoP₂O₆/CNT) were synthesized via a solid-state approach and thoroughly investigated for their bi-functional electrocatalytic performance toward the oxygen evolution reaction (OER) and urea oxidation reaction (UOR). The integration of CNTs significantly improved the electrical conductivity and facilitated charge transport, leading to enhanced catalytic activity. The CoP₂O₆/CNT composite exhibited a low overpotential of 370 mV at 25 mA cm⁻² for OER with a Tafel slope of 158 mV dec⁻¹, outperforming the pristine CoP₂O₆. For UOR, the composite demonstrated a notably reduced overpotential of 170 mV at 25 mA cm⁻² and a Tafel slope of 133 mV dec⁻¹, indicating efficient urea electro-oxidation kinetics. The superior bi-functional activity is attributed to the synergistic interplay between the active phosphate phase and the conductive CNT network, which enhances electron mobility and exposes more electroactive sites. These results position CoP₂O₆/CNT as a promising bi-functional electrocatalyst for sustainable energy applications.

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基于固态策略的碳纳米管集成磷酸钴（CoP2O6/CNT）复合材料的设计与开发，以增强氧和尿素氧化反应的双功能电催化性能

采用固态法合成了磷酸钴（CoP2O6）及其碳纳米管基复合材料（CoP2O6/CNT），并对其在析氧反应（OER）和尿素氧化反应（UOR）中的双功能电催化性能进行了深入研究。CNTs的整合显著改善了电导率，促进了电荷传输，从而增强了催化活性。CoP2O6/CNT复合材料在25 mA cm⁻²下的过电位为370 mV， Tafel斜率为158 mV dec⁻¹，优于原始的CoP2O6。对于UOR，该复合材料显示出25 mA cm⁻²时170 mV的过电位和133 mV dec⁻¹的塔菲斜率显著降低，表明有效的尿素电氧化动力学。优越的双功能活性归因于活性磷酸盐相和导电碳纳米管网络之间的协同相互作用，这增强了电子迁移率并暴露了更多的电活性位点。这些结果表明，CoP2O6/CNT是一种有前途的双功能电催化剂，可用于可持续能源的应用。

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来源期刊

Surfaces and Interfaces Chemistry-General Chemistry

CiteScore

8.50

自引率

6.50%

发文量

753

审稿时长

35 days

期刊介绍： The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)