Hanguang Zhang

( Keynote ) MOF-Derived Catalysts for Electrochemical Energy Conversion

Kota Nakahara, Youngdon Ko, Hubert Szabat, Hanguang Zhang et autres

Thanks to their well-defined structure, high surface area, and tunable chemistry metal organic frameworks (MOFs) have played an increasingly important role in electrocatalysis. Depending on specific application and operating environment, MOFs can be used without further processing or as precursors for actual …

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Ni-Based Metal Organic Framework-Derived Electrocatalyst for Hydrogen Evolution in Alkaline Media

Kota Nakahara, Piotr Połczyński, Hanguang Zhang, Piotr Zelenay

Ni-based materials are among the most active platinum group metal-free (PGM-free) electrocatalysts for hydrogen evolution reaction (HER) in alkaline media. [1] Such catalysts can be obtained by various synthesis approaches, which include the use of metal-organic frameworks (MOFs) as precursors. MOFs offer …

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Unravelling the Stability Stressors of Atomically Dispersed Fe–N–C Oxygen Reduction Catalysts

Xiaohong Xie, Boyang Li, Pan Xu, Moulay Tahar Sougrati et autres

Enhancing the catalytic stability of Fe–N–C catalysts for cathodic oxygen reduction in proton-exchange membrane fuel cells (PEMFCs) necessitates an in-depth understanding of their degradation mechanisms. This study identifies key stressors affecting the stability of Fe–N–C catalysts, specifically acidic environment, oxygen (O 2 …

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Effect of Ionomer on CO 2 Reduction at Atomically Dispersed Ni─N─C Catalyst

Youngdon Ko, Hengquan Guo, Luigi Osmieri, Hanguang Zhang et autres

Abstract Ionomers play an important role in carbon dioxide (CO 2 ) electrolyzers by affecting CO 2 reduction reaction (CO 2 RR) at the cathode. In this study, we systematically examines the impact that different ionomers have on CO 2 RR at …

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(Invited) High-Performance Platinum Group Metal-Free Catalysts for Oxygen Electrochemistry

Piotr Zelenay, Hanguang Zhang, Luigi Osmieri, Sirui Li et autres

Platinum group metal-free (PGM-free) electrocatalysts are earth-abundant and thus low-cost alternatives to PGM catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). In response to the growing energy demand, increasingly centered around hydrogen, the development of high-performance PGM-free ORR and …

Atomically Dispersed Ni‐N‐C Catalysts for Electrochemical CO 2 Reduction

John Weiss, Yanghua He, David A. Cullen, Angelica Benavidez et autres

Abstract The atomic dispersion of nickel in Ni‐N‐C catalysts is key for the selective generation of carbon monoxide through the electrochemical carbon dioxide reduction reaction (CO 2 RR). Herein, the study reports a highly selective, atomically dispersed Ni 1.0% ‐N‐C catalyst with …

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(Keynote) Electrochemical Conversion of Atmospheric CO2 to Value-Added Products

Youngdon Ko, Sergio Díaz-Abad, Luigi Osmieri, Hanguang Zhang et autres

Climate change is an existential threat to humanity that calls for immediate reduction of CO2 concentration in the atmosphere. While drastic reduction in green-house gas emissions needs to remain the primary objective, possible integration of the direct air capture (DAC) and electrocatalytic …

Metal-Organic Framework-Derived PGM-Free Electrocatalysts for Hydrogen Evolution Reaction in Alkaline Media

Hanguang Zhang, Piotr Zelenay

Nickel (Ni)-based materials are among the most promising platinum group metal-free (PGM-free) electrocatalysts for hydrogen evolution reaction (HER) in alkaline media. With the growing demand for green hydrogen production, the HER activity of Ni-based catalysts must be enhanced to meet the goal …

Atomically Dispersed Ni-N-C Catalysts for Electrochemical Carbon Dioxide Reduction

Youngdon Ko, Luigi Osmieri, Hanguang Zhang, Piotr Zelenay

Electrochemical carbon dioxide reduction reaction (CO2RR) has the potential to play a key role in addressing major energy and environmental challenges via clean conversion of the atmospheric CO2 from combusting of fossil fuels into value-added products such as fuels and chemicals. The …

Machine learning-guided design, synthesis, and characterization of atomically dispersed electrocatalysts

Sirui Li, Hanguang Zhang, Edward F. Holby, Piotr Zelenay et autres

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Key Factors for Electrochemical Carbon Dioxide Reduction at Ni-N-C Catalysts

Youngdon Ko, Luigi Osmieri, Hanguang Zhang, Piotr Zelenay

Electrochemical carbon dioxide reduction reaction (CO2RR) has the potential to adequately contribute to addressing the energy and environmental challenges faced by the humanity today. The surplus of CO2 produced by burning fossil fuels can be transformed into valuable products by CO2RR. An …

Gaseous Nitric Oxide As Probe Molecule for Fe-N-C ORR Electrocatalysts

Xiaoping Wang, Magali Ferrandon, Peter Kowalski, Jae Hyung Park et autres

Iron nitrogen carbon (Fe-N-C) electrocatalysts remain the most promising platinum group metal-free (PGM-free) catalysts for the oxygen reduction reaction (ORR) in polymer electrolyte fuel cells (PEFCs). Although significant progress has been made in recent years in improving both the ORR activity and …