Efficient visible-light-driven CO2 reduction into tunable syngas by cobalt phthalocyanine modified flower-like ZnIn2S4 nanosheets

•Cobalt phthalocyanine modified flower-like ZnIn2S4 nanosheets were prepared.•The composites show great photocatalytic syngas generation from CO2 reduction.•The ratio of CO/H2 in syngas is tunable under visible light irradiation.•The flower-like ZnIn2S4 composites demonstrate good photocatalytic durability.•The enhanced photocatalytic activity is contributed by dimension-matched heterojunction.