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Highly efficient electrocatalytic hydrogen evolution from neutral aqueous solution by a water-soluble anionic
Belete B Beyene1, Sandeep B Mane, Chen-Hsiung Hung
1Institute of Chemistry, Academia Sinica, Nankang, Taipei-11529, Taiwan, Republic of China. chhung@gate.sinica.edu.tw.
Chemical Communications (Cambridge, England)
|September 2, 2015
Summary
We developed a water-soluble cobalt catalyst, cobalt(ii) tetrakis(p-sulfonatophenyl)porphyrin (CoTPPS), for efficient hydrogen production from water. This stable catalyst shows high performance in neutral conditions without additives.
Area of Science:
- Electrochemistry
- Catalysis
- Materials Science
Background:
- Efficient hydrogen production is crucial for clean energy.
- Developing stable and active electrocatalysts for water splitting in neutral conditions remains a challenge.
Purpose of the Study:
- To report the use of a water-soluble anionic cobalt(ii) tetrakis(p-sulfonatophenyl)porphyrin (CoTPPS) as a catalyst for electrocatalytic H2 generation.
- To evaluate the stability, activity, and efficiency of CoTPPS in neutral water without organic additives.
Main Methods:
- Electrocatalytic hydrogen generation using CoTPPS.
- Performance evaluation including Faradaic efficiency, turnover frequency, and turnover number.
- Long-term stability testing in neutral phosphate buffer solution.
Main Results:
- CoTPPS demonstrated nearly quantitative Faradaic efficiency for H2 generation.
- A turnover frequency of ~1.83 s⁻¹ and a turnover number of 1.9 × 10⁴ were achieved.
- The catalyst remained active and stable for over 73 hours at -1.29 V (vs. SHE) without performance loss.
Conclusions:
- CoTPPS is a stable, active, and efficient catalyst for electrocatalytic H2 generation from neutral water.
- The absence of organic additives and the catalyst's stability highlight its potential for practical applications.
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