Photo-assisted charging supercapacitors of BiOBr via exposed [1 1 0] facets using pH-dependent control by precipitation method

•The exposed [110] facets of BiOBr are the first report for photo-assisted charging supercapacitors.•Theexposed [110] facets of BiOBr are synthesized by precipitation with pH control.•The degree of exposed [110] facets in BiOBr reflects the photo-induced capacitance response.•Under LED, the specific capacitance of BiOBr-pH 4 is enhanced by 1.45 times relative to dark condition.