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Recovering lost performance

2026-01-13T12:10:16Z

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

2025-10-01T09:10:10Z

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

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

2025-07-25T02:47:56Z

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.

Current-mediated suppression of hydrogen evolution reaction in determination of Zn-metal Coulombic efficiency

2025-07-25T03:33:35Z

Title: Current-mediated suppression of hydrogen evolution reaction in determination of Zn-metal Coulombic efficiency Author(s): Lee, Mingyu; Lee, Hyuntae; Han, Jaewoong; Kim, Chanyeon; Lee, Hongkyung Abstract: Coulombic efficiency (CE) is a crucial metric in battery research, particularly for aqueous Zinc (Zn)-metal batteries. Nonetheless, the accurate determination of Zn CE is complicated due to a lack of awareness about charge loss triggered by the hydrogen evolution reaction (HER) and non-standardized testing conditions. This study reveals the governing factors affecting the Zn CE measurement under different testing conditions, such as applied current density, Zn-plating capacity, and half-cell platforms. Through literature and experimental studies, it is evident that the Zn CE inherently increases with higher current densities and capacities. When decoupling the actual potentials of HER and Zn deposition, HER-triggered parasitic reactions can be self-suppressed owing to greater overpotential for HER than for Zn-plating at higher current densities. A consistent trend was observed when using different Zn salts and current collectors. This awareness can help standardize CE measuring protocols for validating novel concepts and materials. © 2024 Elsevier B.V.