In Situ Grown Epitaxial Heterojunction Exhibits High‐Performance Electrocatalytic Water Splitting
In Situ Grown Epitaxial Heterojunction Exhibits High‐Performance Electrocatalytic Water Splitting
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DOI：
10.1002/adma.201705516
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发表时间：
2018-03
影响因子：
29.4
通讯作者：
C. Zhu;An‐Liang Wang;W. Xiao;Dongliang Chao;Xiao Zhang;N. H. Tiep;Shi Chen;Jiani Kang;Xin Wang-Xi
中科院分区：
文献类型：
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作者：
C. Zhu;An‐Liang Wang;W. Xiao;Dongliang Chao;Xiao Zhang;N. H. Tiep;Shi Chen;Jiani Kang;Xin Wang-Xi
电催化性能可以通过设计专门设计的纳米异质结和微调界面电子结构来增强。本文提出了一种在Co-Ni 3 N纳米线阵列中进行原子外延生长的新方法，其中纳米限制效应在界面处得到加强。通过对NiCo 2 O 4前驱体纳米线进行热退火，在优化的条件下形成了Co-Ni 3 N异质结构阵列，在此过程中纳米线的形貌保持不变。纳米尺度的Co-Ni 3 N的外延生长结构促进了外延界面处两个不同域之间的电子转移，从而显著增强了析氢和析氧反应的催化活性（与单独的Ni 3 N纳米棒相比，各自的翻转频率高10倍和16倍）。通过电子结合能位移和密度泛函理论计算验证了界面转移效应。在两种相容材料的原位原子外延生长期间发生的这种纳米限制效应显示了通往高性能电催化和能量存储的有效途径。
Electrocatalytic performance can be enhanced by engineering a purposely designed nanoheterojunction and fine‐tuning the interface electronic structure. Herein a new approach of developing atomic epitaxial in‐growth in Co‐Ni3N nanowires array is devised, where a nanoconfinement effect is reinforced at the interface. The Co‐Ni3N heterostructure array is formed by thermal annealing NiCo2O4 precursor nanowires under an optimized condition, during which the nanowire morphology is retained. The epitaxial in‐growth structure of Co‐Ni3N at nanometer scale facilitates the electron transfer between the two different domains at the epitaxial interface, leading to a significant enhancement in catalytic activities for both hydrogen and oxygen evolution reactions (10 and 16 times higher in the respective turn‐over frequency compared to Ni3N‐alone nanorods). The interface transfer effect is verified by electronic binding energy shift and density functional theory (DFT) calculations. This nanoconfinement effect occurring during in situ atomic epitaxial in‐growth of the two compatible materials shows an effective pathway toward high‐performance electrocatalysis and energy storages.