Molybdenum disulfide quantum dots decorated bismuth sulfide as a superior noble-metal-free photocatalyst for hydrogen evolution through harnessing a broad solar spectrum

•Photoactivity of MoS2QDs doped Bi2S3 extended from visible to NIR range.•Bi-functional roles of MoS2QDs as electron entrapment sites and spectral converters.•The highest H2 evolution of 17.7 mmol/h.g was achieved under stimulated solar light.