Electrochemical dechlorination reaction (EDR) is a promising, environmentally friendly, and economically profitable technology for treating chlorinated organic pollutants. For efficient environmental protection, electrocatalysts with high stability and low cost are of extremely significance to the development of EDR technology. Carbon-based materials have aroused broad interest as electrocatalysts for many electrochemical reactions due to their characteristics including large specific surface area, controllable structure, good conductivity, and chemical stability. For EDR, the carbon-based materials also show many unique superiorities, like strong adsorption capacity to chlorinated organic compounds (COCs), excellent catalytic activity and stability, and environmental compatibility. This review starts with a detailed summary on the mechanisms of electrochemical dechlorination (direct and indirect electron transfer pathway) and factors affecting the effectiveness of EDR. Then the paper comprehensively overviews the current progresses of carbon-based materials for EDR of COCs, following their two major application scenarios, i.e., directly as electrocatalysts and as advanced supports for other catalysts. Moreover, the formation of different active sites in carbon-based electrocatalysts and their EDR activities are analyzed. Finally, the current challenges and perspectives in this field are discussed. This review will provide an in-depth understanding for the design of advanced carbon-based materials and promote the development of EDR technology.

Two-dimensional materials have been widely used to tune the growth and energy-level alignment of perovskites. However, their incomplete passivation and chaotic usage amounts are not conducive to the preparation of high-quality perovskite films. Herein, we succeeded in obtaining higher-quality CsPbBr₃ films by introducing large-area monolayer graphene as a stable physical overlay on top of TiO₂ substrates. Benefiting from the inert and atomic smooth graphene surface, the CsPbBr₃ film grown on top by the van der Waal epitaxy has higher crystallinity, improved (100) orientation, and an average domain size of up to 1.22 μm. Meanwhile, a strong downward band bending is observed at the graphene/perovskite interface, improving the electron extraction to the electron transport layers (ETL). As a result, perovskite film grown on graphene has lower photoluminescence (PL) intensity, shorter carrier lifetime, and fewer defects. Finally, a photovoltaic device based on epitaxy CsPbBr₃ film is fabricated, exhibiting power conversion efficiency (PCE) of up to 10.64% and stability over 2000 h in the air.