1. Hierarchical molybdenum-doped cobaltous hydroxide nanotubes assembled by cross-linked porous nanosheets with efficient electronic modulation toward overall water splitting.
- Author
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Xu, Chunyang, Lu, Wen, Yan, Lei, Ning, Jiqiang, Zheng, Changcheng, Zhong, Yijun, Zhang, Ziyang, and Hu, Yong
- Subjects
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NANOTUBES , *ELECTRONIC modulation , *HYDROGEN evolution reactions , *OXYGEN evolution reactions , *ELECTRONIC structure , *HYDROXIDES - Abstract
A MOF-based sacrificial template strategy is demonstrated to construct novel Mo-doped Co(OH) 2 hierarchical nanotubes organized by cross-linked porous nanosheets with the optimized electronic structure of more highly oxidative Co3+ species, which exhibits active and stable electrocatalytic activity for overall water splitting. • The Mo-doped Co(OH) 2 HNTs organized by cross-linked porous nanosheets are prepared. • Electronic structures with highly oxidative Co3+ species can be modified by Mo doping. • The low overpotentials of 218 mV and 125 mV for OER and HER are obtained. • Mo-Co(OH) 2 HNTs exhibit high electrocatalytic activity for overall water splitting. Designing hierarchical nanostructures of earth-abundant electrocatalysts for enhanced overall water splitting performance is of great significance. Herein, Mo-doped Co(OH) 2 hierarchical nanotubes (Mo-Co(OH) 2 HNTs) assembled by cross-linked porous nanosheets are designed and synthesized through a sacrificial template strategy. Benefiting from the hierarchical structures based on porous nanosheets with void interior as well as modified electronic structure of higher intensity of Co3+ species by Mo6+ doping, the Mo-Co(OH) 2 HNTs demonstrate superior electrocatalytic performance, achieving an current density of 10 mA cm−2 at the low overpotentials of 218 mV and 125 mV for oxygen and hydrogen evolution reactions, respectively. Furthermore, an overall water splitting cell was assembled with the Mo-Co(OH) 2 electrocatalyst as both the anode and cathode materials, which exhibits a driving voltage of as low as 1.62 V. The facile strategy presented in this work can be extended to the construction of various hollow/porous nanostructures with effective heteroatom doping to achieve low-cost, bifunctional and high-performance electrocatalysts for overall water splitting. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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