PS80 was obtained from J.T Baker (batch No.: 0000190014), NOF corporation (Tokyo, Japan) (batch No.: 906351D), Nanjing Well Chemical (batch No.:20181202-1). Illuminating incubator was purchased from Honeywell. Sodium phosphate dibasic anhydrous was from Shanghai Experimental Reagent Co., Ltd. Hydrogen peroxide (Lot: K507947098117) was purchased from Fisher Scientific. Ferric chloride anhydrous (Lot: Z19E045)) was purchased from MP Biomedicals. Cupric chloride anhydrous (Lot: 0000067158) was purchased from Aldrich. Nickel ()chloride hexahydrate (Lot: A0413843) was purchased from Acros. L-Histidine hydrochloride monohydrate (batch No.: 0000210783) and L-Histidine (batch No.: 0000146472) were purchased from J.T Baker.