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Pushkarev AS, Pushkareva IV, Kozlova MV, Solovyev MA, Butrim SI, Ge J, Xing W, Fateev VN. Heteroatom-Modified Carbon Materials and Their Use as Supports and Electrocatalysts in Proton Exchange Membrane Fuel Cells (A Review). RUSS J ELECTROCHEM+ 2022. [DOI: 10.1134/s1023193522070114] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zhao MJ, Su SY, Deng N, Shi JQ, Li F, He JB. The Central Role of Nitrogen Atoms in a Zeolitic Imidazolate Framework-Derived Catalyst for Cathodic Hydrogen Evolution. CHEMSUSCHEM 2021; 14:3926-3934. [PMID: 34288529 DOI: 10.1002/cssc.202101337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Revised: 07/20/2021] [Indexed: 06/13/2023]
Abstract
Platinum usually offers the most effective active center for hydrogen evolution reaction (HER), because of the optimal trade-off between the adsorption and desorption of hydrogeN atoms (H*) on Pt atoms. Herein, we report an unusual result regarding the active center of a HER catalyst, which was synthesized by electrodepositing traces of Pt nanoparticles (NPs) into a porous nitrogen-rich dodecahedron matrix derived from zeolitic imidazolate framework ZIF-8. With an ultra-low Pt loading of 2.76 μg cm-2 , the N-Pt-bonded catalyst can produce a current density of 117 mA cm-2 for the HER in 1.0 m H2 SO4 at an overpotential of 50 mV, whereas the commercial Pt/C (300 μg cm-2 Pt) can only reach 50 mA cm-2 under the same conditions. Cyclic voltammetry demonstrates that both the H* adsorption and the Pt oxidation are not allowed to occur on this catalyst, due to a full surface coverage of the trace Pt NPs by imidazole. The results from the specially designed experiments indicate that the imidazole N atoms may act as proton anchor-sites for the HER due to their electron donor nature. Density functional theory calculations also support a catalytic HER mechanism centered at the Pt-supported N active center, which needs a Gibbs free energy of H* absorption (ΔGH* ) significantly smaller than the absolute value of ΔGH* on the Pt(111) surface. We hope that the results of this study will encourage the research on novel N-centered catalysts for the HER.
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Affiliation(s)
- Meng-Jie Zhao
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, P. R. China
| | - Sheng-Ying Su
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, P. R. China
| | - Ning Deng
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, P. R. China
| | - Jun-Qing Shi
- Anhui Province Key Laboratory of Green Manufacturing of Power Battery, Tianneng, Fuyang, Jieshou, 236500, P. R. China
| | - Fang Li
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, P. R. China
- Anhui Province Key Laboratory of Green Manufacturing of Power Battery, Tianneng, Fuyang, Jieshou, 236500, P. R. China
| | - Jian-Bo He
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, 230009, P. R. China
- Anhui Province Key Laboratory of Green Manufacturing of Power Battery, Tianneng, Fuyang, Jieshou, 236500, P. R. China
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Carbon Monoxide Tolerant Pt-Based Electrocatalysts for H2-PEMFC Applications: Current Progress and Challenges. Catalysts 2021. [DOI: 10.3390/catal11091127] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
The activity degradation of hydrogen-fed proton exchange membrane fuel cells (H2-PEMFCs) in the presence of even trace amounts of carbon monoxide (CO) in the H2 fuel is among the major drawbacks currently hindering their commercialization. Although significant progress has been made, the development of a practical anode electrocatalyst with both high CO tolerance and stability has still not occurred. Currently, efforts are being devoted to Pt-based electrocatalysts, including (i) alloys developed via novel synthesis methods, (ii) Pt combinations with metal oxides, (iii) core–shell structures, and (iv) surface-modified Pt/C catalysts. Additionally, the prospect of substituting the conventional carbon black support with advanced carbonaceous materials or metal oxides and carbides has been widely explored. In the present review, we provide a brief introduction to the fundamental aspects of CO tolerance, followed by a comprehensive presentation and thorough discussion of the recent strategies applied to enhance the CO tolerance and stability of anode electrocatalysts. The aim is to determine the progress made so far, highlight the most promising state-of-the-art CO-tolerant electrocatalysts, and identify the contributions of the novel strategies and the future challenges.
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