Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
NiSe‐Ni0.85Se Heterostructure Nanoflake Arrays on Carbon Paper as Efficient Electrocatalysts for Overall Water Splitting
Small ( IF 13.0 ) Pub Date : 2018-05-27 , DOI: 10.1002/smll.201800763
Yajie Chen 1 , Zhiyu Ren 1 , Huiying Fu 1 , Xin Zhang 1 , Guohui Tian 1 , Honggang Fu 1
Small ( IF 13.0 ) Pub Date : 2018-05-27 , DOI: 10.1002/smll.201800763
Yajie Chen 1 , Zhiyu Ren 1 , Huiying Fu 1 , Xin Zhang 1 , Guohui Tian 1 , Honggang Fu 1
Affiliation
|
Fabricating cost‐effective, bifunctional electrocatalysts for both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in basic media is critical for renewable energy generation. Here, NiSe/CP, Ni0.85Se/CP, and NiSe‐Ni0.85Se/CP heterostructure catalysts with different phase constitutions are successfully prepared through in situ selenylation of a NiO nanoflake array oriented on carbon paper (CP) by tuning the original Ni/Se molar ratio of the raw materials. The relationship between the crystal phase component and electrocatalytic activity is systematically studied. Benefiting from the synergetic effect of the intrinsic metallic state, facile charge transport, abundant catalytic active sites, and multiple electrolyte transmission paths, the optimized NiSe‐Ni0.85Se/CP exhibits a remarkably higher catalytic activity for both the HER and OER than single‐phase NiSe/CP and Ni0.85Se/CP. A current density of 10 mA cm−2 at 1.62 V and a high stability can be obtained by using NiSe‐Ni0.85Se/CP as both the cathode and anode for overall water splitting under alkaline conditions. Density functional theory calculations confirm that H and OH− can be more easily adsorbed on NiSe‐Ni0.85Se than on NiSe and Ni0.85Se. This study paves the way for enhancing the overall water splitting performance of nickel selenides by fabricating heterophase junctions using nickel selenides with different phases.
中文翻译：
碳纸上的NiSe-Ni0.85Se异质结构纳米薄片阵列作为有效的总水分解电催化剂
在碱性介质中为氢释放反应（HER）和氧释放反应（OER）制造具有成本效益的双功能电催化剂，对于可再生能源的生产至关重要。在这里，通过调整原始Ni，通过在碳纸（CP）上对NiO纳米片阵列进行原位硒化，成功制备了具有不同相组成的NiSe / CP，Ni 0.85 Se / CP和NiSe‐Ni 0.85 Se / CP异质结构催化剂原料的/ Se摩尔比。系统地研究了晶相成分与电催化活性之间的关系。得益于固有金属态，便捷的电荷传输，丰富的催化活性位点和多种电解质传输路径的协同效应，优化的NiSe-Ni0.85 Se / CP对HER和OER的催化活性均比单相NiSe / CP和Ni 0.85 Se / CP高。通过使用NiSe-Ni 0.85 Se / CP作为阴极和阳极，在碱性条件下进行总水分解，可获得电流密度为1.62 V时10 mA cm -2的高稳定性。密度泛函理论计算证实，H和OH -可以更容易地吸附在NISE镍0.85硒比NISE和Ni 0.85硒。这项研究通过使用具有不同相的硒化镍制造异相结为增强硒化镍的整体水分解性能铺平了道路。
更新日期：2018-05-27
中文翻译：
碳纸上的NiSe-Ni0.85Se异质结构纳米薄片阵列作为有效的总水分解电催化剂
在碱性介质中为氢释放反应（HER）和氧释放反应（OER）制造具有成本效益的双功能电催化剂，对于可再生能源的生产至关重要。在这里，通过调整原始Ni，通过在碳纸（CP）上对NiO纳米片阵列进行原位硒化，成功制备了具有不同相组成的NiSe / CP，Ni 0.85 Se / CP和NiSe‐Ni 0.85 Se / CP异质结构催化剂原料的/ Se摩尔比。系统地研究了晶相成分与电催化活性之间的关系。得益于固有金属态，便捷的电荷传输，丰富的催化活性位点和多种电解质传输路径的协同效应，优化的NiSe-Ni0.85 Se / CP对HER和OER的催化活性均比单相NiSe / CP和Ni 0.85 Se / CP高。通过使用NiSe-Ni 0.85 Se / CP作为阴极和阳极，在碱性条件下进行总水分解，可获得电流密度为1.62 V时10 mA cm -2的高稳定性。密度泛函理论计算证实，H和OH -可以更容易地吸附在NISE镍0.85硒比NISE和Ni 0.85硒。这项研究通过使用具有不同相的硒化镍制造异相结为增强硒化镍的整体水分解性能铺平了道路。
京公网安备 11010802027423号