A Zero‐Gap Gas Phase Photoelectrolyzer for CO2 Reduction with Porous Carbon Supported Photocathodes

Author:

Zhao Yujie1ORCID,Merino‐Garcia Ivan2ORCID,Albo Jonathan2ORCID,Kaiser Andreas1ORCID

Affiliation:

1. Department of Energy Conversion and Storage Technical University of Denmark 2800 Kgs. Lyngby Denmark

2. Departamento de Ingenierías Química y Biomolecular Universidad de Cantabria Avda. Los Castros s/n. 39005 Santander Spain

Abstract

AbstractA modified Metal‐Organic Framework UiO‐66‐NH2‐based photocathode in a zero‐gap gas phase photoelectrolyzer was applied for CO2 reduction. Four types of porous carbon fiber layers with different wettability were employed to tailor the local environment of the cathodic surface reactions, optimizing activity and selectivity towards formate, methanol, and ethanol. Results are explained by mass transport through the different type and arrangement of carbon fiber support layers in the photocathodes and the resulting local environment at the UiO‐66‐NH2 catalyst. The highest energy‐to‐fuel conversion efficiency of 1.06 % towards hydrocarbons was achieved with the most hydrophobic carbon fiber (H23C2). The results are a step further in understanding how the design and composition of the photoelectrodes in photoelectrochemical electrolyzers can impact the CO2 reduction efficiency and selectivity.

Funder

Villum Fonden

Nordic Energy Research

European Commission

Publisher

Wiley

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