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. 2019 Jul 18;6(17):1900576.
doi: 10.1002/advs.201900576. eCollection 2019 Sep 4.

Construction of Hierarchical Co-Fe Oxyphosphide Microtubes for Electrocatalytic Overall Water Splitting

Peng Zhang  1 , Xue Feng Lu  1 , Jianwei Nai  1 , Shuang-Quan Zang  2 , Xiong Wen David Lou  1
Affiliations

Construction of Hierarchical Co-Fe Oxyphosphide Microtubes for Electrocatalytic Overall Water Splitting

Peng Zhang et al. Adv Sci (Weinh). .

Abstract

Development of efficient electrocatalysts is a crucial requirement to build water splitting systems for the production of clean and sustainable fuels. This goal could be achieved by fine-tuning the composition and structure of the electrocatalytic materials. Here, a facile self-templated synthetic strategy is developed for the fabrication of hierarchical Co-Fe oxyphosphide microtubes (MTs). Fe-based metal-organic compound microrods are first synthesized as the self-sacrificing template. Afterward, the Fe-based precursors are converted into hierarchical Co-Fe layered double hydroxide MTs through a hydrothermal approach, which are then transformed into the hierarchical Co-Fe oxyphosphide MTs by a phosphidation treatment. Benefiting from the synergistic effect of the compositions and the advantages of the hierarchical hollow structure, the obtained electrocatalyst exhibits enhanced performance for overall water splitting.

Keywords: hierarchical; hollow; microtubes; oxyphosphides; water splitting.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Schematic illustration of the formation process of hierarchical Co–Fe oxyphosphide MTs. i) Conversion of FeMOC MRs into hierarchical Co–Fe LDH MTs through a hydrothermal reaction. ii) Transformation of the hierarchical Co–Fe LDH MTs into hierarchical Co–Fe oxyphosphide MTs by a phosphidation treatment.
Figure 2
Figure 2
a,b) FESEM and c) TEM images of FeMOC MRs. d,e) FESEM and f) TEM images of hierarchical Co–Fe LDH MTs.
Figure 3
Figure 3
a–d) FESEM and e,f) TEM images of hierarchical Co–Fe oxyphosphide MTs. g) HAADF‐STEM image of a hierarchical Co–Fe oxyphosphide MT with elemental mappings for Co, Fe, P, O, and corresponding overlay image.
Figure 4
Figure 4
a) LSV curves of Fe oxyphosphide, Co oxyphosphide, Co–Fe LDH, Co–Fe oxyphosphide, and benchmark IrO2 for OER. b) Tafel plots of Fe oxyphosphide, Co oxyphosphide, Co–Fe LDH, and Co–Fe oxyphosphide for OER. c) Time‐dependent curve of relative current density to the initial 10 mA cm−2 of Co–Fe oxyphosphide for OER.
Figure 5
Figure 5
a) LSV curves of Fe oxyphosphide, Co oxyphosphide, Co–Fe LDH, Co–Fe oxyphosphide, and benchmark Pt/C for HER. b) Tafel plots of Fe oxyphosphide, Co oxyphosphide, Co–Fe LDH, and Co–Fe oxyphosphide for HER. c) Time‐dependent curve of relative current density to the initial −10 mA cm−2 of Co–Fe oxyphosphide for HER.
See this image and copyright information in PMC

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