Strong Electronic Interaction in Dual‐Cation‐Incorporated NiSe2 Nanosheets with Lattice Distortion for Highly Efficient Overall Water Splitting,Advanced Materials

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Strong Electronic Interaction in Dual‐Cation‐Incorporated NiSe2 Nanosheets with Lattice Distortion for Highly Efficient Overall Water Splitting
Advanced Materials ( IF 27.4 ) Pub Date : 2018-07-10 , DOI: 10.1002/adma.201802121
Yiqiang Sun _{1,

2} , Kun Xu ₃ , Zengxi Wei ₄ , Huilin Li _{1,

2} , Tao Zhang _{1,

2} , Xinyang Li ₁ , Weiping Cai ₁ , Jianmin Ma ₄ , Hong Jin Fan ₃ , Yue Li ₁

Affiliation

Exploring highly efficient and low‐cost electrocatalysts for electrochemical water splitting is of importance for the conversion of intermediate energy. Herein, the synthesis of dual‐cation (Fe, Co)‐incorporated NiSe₂ nanosheets (Fe, Co‐NiSe₂) and systematical investigation of their electrocatalytic performance for water splitting as a function of the composition are reported. The dual‐cation incorporation can distort the lattice and induce stronger electronic interaction, leading to increased active site exposure and optimized adsorption energy of reaction intermediates compared to single‐cation‐doped or pure NiSe₂. As a result, the obtained Fe_0.09Co_0.13‐NiSe₂ porous nanosheet electrode shows an optimized catalytic activity with a low overpotential of 251 mV for oxygen evolution reaction and 92 mV for hydrogen evolution reaction (both at 10 mA cm⁻² in 1 m KOH). When used as bifunctional electrodes for overall water splitting, the current density of 10 mA cm⁻² is achieved at a low cell voltage of 1.52 V. This work highlights the importance of dual‐cation doping in enhancing the electrocatalyst performance of transition metal dichalcogenides.

中文翻译：

在双阳离子结合的NiSe2纳米片中具有强大的电子相互作用，具有晶格畸变，可实现高效的总水分解

探索用于电化学水分解的高效，低成本的电催化剂对于中间能的转化非常重要。本文报道了掺有双阳离子（Fe，Co）的NiSe ₂纳米片（Fe，Co-NiSe ₂）的合成以及它们对水分解的电催化性能与组成的关系的系统研究。与单阳离子掺杂或纯NiSe ₂相比，双阳离子掺入可扭曲晶格并引起更强的电子相互作用，从而导致活性位点暴露增加和反应中间体的优化吸附能。结果，获得了Fe _0.09 Co _0.13 -NiSe ₂多孔纳米片电极显示出优化的催化活性，对于氧气析出反应具有低过电势，为251 mV，对于氢气析出反应具有低过电势（在1 m KOH中均为10 mA cm ^-2）。当用作整体水分解的双功能电极时，在1.52 V的低电池电压下可实现10 mA cm ^-2的电流密度。这项工作突显了双阳离子掺杂在增强过渡金属二卤化物的电催化剂性能方面的重要性。

更新日期：2018-07-10

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