Heterostructure of 2D CoP Nanosheets/1D Carbon Nanotubes to Significantly Boost the Alkaline Hydrogen Evolution,Advanced Materials Interfaces

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Heterostructure of 2D CoP Nanosheets/1D Carbon Nanotubes to Significantly Boost the Alkaline Hydrogen Evolution
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2019-12-12 , DOI: 10.1002/admi.201901302
Yu Zhang ₁ , Yong Wang ₁ , Tingting Wang ₁ , Niandu Wu ₁ , Yuanqi Wang ₁ , Yuan Sun ₁ , Lin Fu ₁ , Youwei Du ₁ , Wei Zhong ₁

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The enhancement of catalytic performance of cobalt phosphide‐based catalysts is highly desirable but still challenging to replace noble metal for the hydrogen evolution reaction (HER) in alkaline. Here, a unique hetero‐nanostructure of CoP nanosheets (CoP NS) grafted by carbon nanotubes (CNTs) is reported. As analyzed and discussed, the well‐maintained open porous CoP nanosheets structure and abundant active interfaces between CNTs and CoP NS at the CoP NS/CNTs catalyst, together with enlarged catalytic active sites, reduce HER reaction energy barrier, increase charge transfer rate offered by the hybrid porous structure, and contribute to the extraordinary water reduction performance. Furthermore, the wettability of CoP NS/CNTs is also enhanced relative to CoP NS. Consequently, this CoP NS/CNTs unique hetero‐nanostructure shows significantly high‐efficiency HER activity in 1.0 m KOH electrolyte with negligible onset overpotential, a small overpotential of 68 mV at −10 mA cm⁻², a low Tafel slope of 57 mV dec⁻¹, and stability of up to 24 h, which is among the best reported values for CoP‐based HER electrocatalysts in alkaline media to date. This study provides an insight into rational design and low‐cost synthesis of the non‐precious‐based electrocatalysts based on interfaces and wettability with high efficiency and stability for HER.

中文翻译：

2D CoP纳米片/ 1D碳纳米管的异质结构显着促进碱性氢的逸出

迫切需要提高磷化钴基催化剂的催化性能，但要在碱性条件下用贵金属替代氢逸出反应（HER）仍然具有挑战性。在这里，报道了由碳纳米管（CNT）接枝的CoP纳米片（CoP NS）的独特异质结构。经过分析和讨论，在CoP NS / CNTs催化剂上，维护良好的开放式多孔CoP纳米片结构以及CNT与CoP NS之间丰富的活性界面，以及扩大的催化活性位点，降低了HER反应的能垒，提高了电荷转移速率。混合多孔结构，并有助于非凡的减水性能。此外，相对于CoP NS，CoP NS / CNT的润湿性也得到增强。所以，m KOH电解质，其起始过电势可忽略不计，-10 mA cm ^-2时的小过电势为68 mV，Tafel斜率较低，为57 mV dec ^-1，长达24 h的稳定性，这是CoP的最佳报告值之一迄今为止，在碱性介质中基于HER的电子催化剂。这项研究为基于HER的界面和润湿性的高效，高稳定性的非贵金属电催化剂的合理设计和低成本合成提供了见识。

更新日期：2019-12-12

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