Template-Directed Growth of Well-Aligned MOF Arrays and Derived Self-Supporting Electrodes for Water Splitting

Overview

Title: 

Template-Directed Growth of Well-Aligned MOF Arrays and Derived Self-Supporting Electrodes for Water Splitting

Abstract: 

The conversion of traditional metal-organic framework (MOF) nanocrystals to self-supporting and well-aligned MOF superstructures is highly desired for diverse functional applications but remains a significant challenge. In this work, we develop a versatile strategy for the controllable synthesis of three- dimensional MOF hybrid arrays by utilizing semiconducting nanostructures as self-sacrificing templates. Typically, different MOF nanorod or nanowall arrays on various substrates have been successfully fabricated. Particularly, MOF- hybrid-array-derived carbon-based composites with well-aligned hierarchical morphology and self-supporting structure can be directly applied to both an- odes and cathodes for water splitting. They exhibit excellent electrocatalytic performance and are superior to the pristine semiconducting arrays, as well as other MOF-based counterparts. This work provides a strategy for the rational assembly of well-aligned MOF arrays on various substrates, which could serve as a promising platform for diverse applications.

Authors: 

Cai, Guorui; Zhang, Wang; Jiao, Long; Yu, Shu-Hong; Jiang, Hai-Long

DOI: 

Journal: 

Chem

Year: 

2017

Catalysis

Catalysis: 

Indicate the type of catalyst: 

Catalyst Name/Chemical Formula: 

  • Ni@CoO@CoNC

Catalyst Keyword(s): 

MOF
Nickel
Cobalt

Description of catalysis: 

Reaction type: 

Reactants: 

Reactant: 

Products: 

Product: 

Solvent(s): 

pH: 

14.00

Operating Temperature: 

22.00
C

Proposed mechanism: 

Measured Stability: 

20.00
hours (hr)

Observed decrease in stability: 

No

Regenerative?: 

No

Type of Electrocatalysis: 

Surface Area Enhancement: 

Electrical Source: 

Overpotential: 

0.31
V

Reference Electrode: 

Electrode Support: 

Potential at 10 mA/cm2: 

0.31
V

pH (10mA): 

14.00

Tafel Parameter: Slope: 

0.05
V/decade of current

Overpotential pH: 

14.00

Referenced to Fc+/Fc?: 

No

Buffer: 

Buffer pH: 

14.00

Buffer Concentration: 

1.00
M

Is a proton source used?: 

No

Is Bulk Electrolysis reported?: 

No

Active Wavelength Range: 

Unit: 

ASTM Illumination Conditions: 

No

Is the system PV-driven?: 

No

Active Wavelength Range: 

Unit: 

Catalyst and photoactive species are the same: 

Is the photoactive species molecular?: 

No

Anode Material Photoactive: 

Cathode Material Photoactive: 

ASTM Illumination Conditions: 

No

Indicate the type of catalyst: 

Catalyst Keyword(s): 

MOF
Nickel
Cobalt

Description of catalysis: 

Reaction type: 

Reactants: 

Reactant: 

Products: 

Product: 

Solvent(s): 

pH: 

14.00

Operating Temperature: 

22.00
C

Proposed mechanism: 

Measured Stability: 

20.00
hours (hr)

Observed decrease in stability: 

No

Type of Electrocatalysis: 

Surface Area Enhancement: 

Electrical Source: 

Overpotential: 

0.19
V

Reference Electrode: 

Electrode Support: 

Potential at 10 mA/cm2: 

0.19
V

pH (10mA): 

14.00

Tafel Parameter: Slope: 

0.10
V/decade of current

Overpotential pH: 

14.00

Referenced to Fc+/Fc?: 

No

Buffer: 

Buffer pH: 

14.00

Buffer Concentration: 

1.00
M

Is a proton source used?: 

No

Is Bulk Electrolysis reported?: 

No

Active Wavelength Range: 

Unit: 

ASTM Illumination Conditions: 

No

Is the system PV-driven?: 

No

Active Wavelength Range: 

Unit: 

Catalyst and photoactive species are the same: 

Is the photoactive species molecular?: 

No

Anode Material Photoactive: 

Cathode Material Photoactive: 

ASTM Illumination Conditions: 

No

Keywords: 

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