Cover Image, Volume 6, Number 4, April 2024

Front cover image: Solar‐driven CO2 conversion to solar fuels via semiconductor‐photocatalysis is promising, however, it suffers from low selectivity and efficiency due to the lack of desired functionalities of the photocatalyst, and in article number cey2420, Xuezhong Gong et al. demonstrated the selective photoreduction of CO2 to CO using elaborately fabricated ultrathin Bi12O17Cl2 nanosheets, identify the functions of bismuth clusters and oxygen vacancies, elucidate synergetic effect, and provide new research approach for preparing smart multi‐functional photocatalysts.