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Recovering lost performance

2025-10-31T15:00:00Z

Title: Recovering lost performance Author(s): Kwon, Woosuck; Kim, Chanyeon Abstract: Catalysts often transform dynamically during reaction, bringing challenges in terms of changing activity, selectivity, and stability. Research now demonstrates an operation strategy based on in situ catalyst formation and dissolution to recover the performance of catalysts for electrochemical CO2 reduction to methane.

이온 전도성 고분자 이용 전기화학적 이산화탄소 환원 촉매의 미세환경제어

2023-11-30T15:00:00Z

Title: 이온 전도성 고분자 이용 전기화학적 이산화탄소 환원 촉매의 미세환경제어 Author(s): 이수연; 김찬연 Abstract:

Engineering Microenvironments for Photo-Electrochemical Reduction of Carbon Dioxide

2024-10-09T15:00:00Z

Title: Engineering Microenvironments for Photo-Electrochemical Reduction of Carbon Dioxide Author(s): Kim, Chanyeon; Bell, Alexis T. Abstract: Due to the escalating crisis of global warming, carbon dioxide (CO2) conversion has garnered significant attention as a pivotal technology for sustainable energy and chemical processes. However, the challenge lies in its nature as a strong endothermic reaction with substantial activation energy, thus requiring extensive energy input. Therefore, integration with renewable energy sources becomes imperative. In this regard, Photo- and electrochemical CO2 reduction (CO2R) presents promising avenues for converting CO2 with water (H2O) using electricity derived from renewable sources, thereby producing various chemicals and fuels. However, the abundance of H2O in the catalytic microenvironment promotes the competing evolution of hydrogen (H2), leading to diminished energy efficiency and selectivity toward CO2R products. Additionally, another challenge is to selectively produce valuable multicarbon products (C2+ products), including C2H4, C2H5OH, and C3H7OH, which hold higher market value and greater market volume compared to single-carbon products (C1 products) like HCOOH, CO, and CH4. Among various CO2R catalysts, Copper (Cu)-based materials have emerged as prominent candidates due to their capability to yield C2+ products with considerable activity and selectivity. Recent studies suggest that catalytic microenvironments significantly influence C2+ production on Cu-based catalysts. Hence, this presentation aims to elucidate the impact of these microenvironments near Cu catalysts and explore how this knowledge can be effectively applied to design a photocathode for the photo-electrochemical reduction of CO2, thereby enhancing the production of C2+ products.

Surface Composition Impacts Selectivity of ZnTe Photocathodes in Photoelectrochemical CO2 Reduction Reaction

2024-12-31T15:00:00Z

Title: Surface Composition Impacts Selectivity of ZnTe Photocathodes in Photoelectrochemical CO2 Reduction Reaction Author(s): Zeng, Guosong; Liu, Guiji; Panzeri, Gabriele; Kim, Chanyeon; Song, Chengyu; Alley, Olivia J.; Bell, Alexis T.; Weber, Adam Z.; Toma, Francesca M. Abstract: Light-driven reduction of CO2 into chemicals using a photoelectrochemical (PEC) approach is considered as a promising way to meet the carbon neutral target. The very top surface of the photoelectrode and semiconductor/electrolyte interface plays a pivotal role in defining the performance for PEC CO2 reduction. However, such impact remains poorly understood. Here, we report an electrodeposition-annealing route for tailoring surface composition of ZnTe photocathodes. Our work demonstrates that a Zn-rich surface on the ZnTe photocathode is essential to impact the CO2 reduction activity and selectivity. In particular, the Zn-rich surface not only facilitated the interfacial charge carrier transfer, but also acted as electrocatalyst for boosting carbon product selectivity and suppressing the hydrogen evolution reaction. This work provides a new avenue to optimize the photocathode, as well as improvement of the CO2RR performance. © 2024 The Authors. Published by American Chemical Society.