Key Lab of Materials Physics, Anhui Key Lab of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, P. R. China.
Science Island Branch, University of Science and Technology of China, Hefei, 230026, P. R. China.
Adv Mater. 2018 Aug;30(35):e1802121. doi: 10.1002/adma.201802121. Epub 2018 Jul 10.
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 NiSe nanosheets (Fe, Co-NiSe ) 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 NiSe . As a result, the obtained Fe Co -NiSe 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 in 1 m KOH). When used as bifunctional electrodes for overall water splitting, the current density of 10 mA cm 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.
探索高效、低成本的电催化剂对于中间能源的转化具有重要意义。本文报道了双阳离子（Fe、Co）共掺杂 NiSe 纳米片（Fe、Co-NiSe）的合成及其作为功能组成的电化学水分解性能的系统研究。双阳离子的掺入可以扭曲晶格并诱导更强的电子相互作用，与单阳离子掺杂或纯 NiSe 相比，增加了活性位点的暴露和优化了反应中间体的吸附能。结果表明，所得到的 Fe-Co-NiSe 多孔纳米片电极表现出优化的催化活性，析氧反应的过电位低至 251 mV，析氢反应的过电位低至 92 mV（均在 1 m KOH 中 10 mA cm 时）。当用作整体水分解的双功能电极时，在低至 1.52 V 的电池电压下即可实现 10 mA cm 的电流密度。这项工作强调了双阳离子掺杂在提高过渡金属二硫属化物电催化剂性能方面的重要性。
