CdS photocorrosion is one of the most important factors that greatly affect the photocatalytic H2-production rate and long-time stability.However,the reported works about CdS photocorrosion are mainly focused on the surface oxidation by photogenerated holes,while the possible reduction of lat-tice Cd2+by photogenerated electrons is usually ignored.In this work,the lattice Cd2+reduction by photogenerated electrons during CdS photocorrosion were carefully investigated to reveal its potential effect on the microstructure change and photocatalytic H2-production performance of CdS photocatalyst based on the two typical Na2S-Na2SO3 and lactic acid H2-evolution systems.It was found that many iso-lated metallic Cd nanoparticles(5-50 nm)were produced on the CdS surface in the Na2S-Na2SO3 system,causing its serious destroy of CdS surface and a gradually decreased photocatalytic activity,while only a metallic Cd layer(2-3 nm)is homogeneously coated on the CdS surface in the lactic acid system,leading to an increased H2-evolution rate.In fact,once a certain amount of metallic Cd was produced on the CdS surface,the resulting CdS-Cd composites can present a stable photocatalytic H2-production activity and excellent stability for the final CdS-Cd photocatalysts.Hence,a photoinduced self-stability mechanism of CdS photocatalyst has been proposed,namely,the spontaneously produced metallic Cd contributes to the transformation of unstable CdS into stable CdS-Cd structure,with the simultaneous realization of final stable H2-evolution performance.

Yuxiao Chen;Wei Zhong;Feng Chen;Ping Wang;Jiajie Fan;Huogen Yu

School of Chemistry,Chemical Engineering and Life Sciences,and State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450002,China;Laboratory of Solar Fuel,Faculty of Materials Science and Chemistry,China University of Geosciences,Wuhan 430070,China

材料科学技术（英文版）

[1]Yuxiao Chen;Wei Zhong;Feng Chen;Ping Wang;Jiajie Fan;Huogen Yu-.Photoinduced self-stability mechanism of CdS photocatalyst:The dependence of photocorrosion and H2-evolution performance)[J].材料科学技术（英文版）,2022(26):19-27

Cd2+by,Cd2+reduction

Photoinduced,self,stability,mechanism,CdS,dependence,photocorrosion,H2,evolution,performance,one,most,important,factors,that,greatly,affect,photocatalytic,production,long,However,reported,works,about,mainly,focused,surface,oxidation,photogenerated,holes,while,possible,electrons,usually,ignored,In,this,lattice,during,were,carefully,investigated,reveal,its,potential,effect,microstructure,change,two,typical,Na2SO3,lactic,acid,systems,It,was,found,many,iso,lated,metallic,nanoparticles,produced,causing,serious,destroy,gradually,decreased,activity,only,layer,homogeneously,coated,leading,increased,once,certain,amount,resulting,composites,can,present,excellent,final,photocatalysts,Hence,photoinduced,has,been,proposed,namely,spontaneously,contributes,transformation,unstable,into,simultaneous,realization

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