Abdelfatah M.

Aditya T.

Anandan S.

Azevedo J.

Baek S. K.

Bai C.

Banerjee A.

Bhunia K.

Bian J.

Chen J.

Cheng J.

Chuang P. K.

Colmenares J. C.

Cui Y.

Daubert J. S.

Dong G.

Dubale A. A.

Gao M.

Goettmann F.

Gopalakrishnan S.

Gou X.

Goud R. K.

Han C.

Holst J. R.

Hong Y.

Hou Y.

Hsu S. H.

Huo Y.

Jang Y. J.

Jayaramulu K.

Kong Y.

Kudo A.

Kumar S.

Kunturu P. P.

Lan-Rong Z.

Liang S.

Liu B.

Liu D.

Lu L.

Luo J.

Ma X.

Martínez-García A.

McShane C. M.

Minami T.

Morales-Guio C. G.

Musselman K. P.

Niu P.

Ong W. J.

Pan L.

Paracchino A.

Pawar R. C.

Roger I.

Schreier M.

Septina W.

Shaislamov U.

Shan W.

Sivula K.

Song Y.

Sun S.

Sun Y.

Tian Y.

Tilley S. D.

Walsh A.

Walter M. G.

Wang A.

Wang H.

Wang X.

Wang Z.

Wen M. Q.

Wojtyła S.

Wu D.

Wu G.

Wu N.

Wu P.

Xi Q.

Yang F.

Yang S.

Yang Y.

You Y.

Zhang J.

Zhang P.

Zhang Z.

Zhao Y. F.

Zheng Y.

Zhou C.

Zuo S.

English

Fabricating efficient heterojunction photocathodes to accelerate charge transport and long-term stability is important to promote visible light-driven hydrogen evolution. With the strategic combination of type II band edge heterojunctions and passivation layers of graphitic carbon nitride (g-C3N4), Cu2O/g-C3N4/CoS photocathodes that achieve high photostability have been fabricated. We used spin-coating and electrospinning techniques to synthesize g-C3N4nanosheets and nanowires, respectively, which were deposited on Cu2O on fluorine-doped tin oxide (FTO) substrates. In case of Cu2O/g-C3N4nanosheets, the loading of g-C3N4was varied from 1 to 7 wt% and the highest photocatalytic activity (5.8 mA/cm2at 0 V RHE) was obtained for the heterojunction prepared from the 5 wt% solution. For g-C3N4nanowires, varying the electrospinning time (from 0.5 to 12 min) controlled the loading of these nanowires, and the heterojunction with 8 min spinning time displayed the highest photocurrent density (6.6 mA/ cm2at 0 V vs RHE). The higher photocatalytic activity and better stability of the Cu2O/g-C3N4nanowires (8 min)/CoS heterojunction arises from the effective separation and transport of photo-generated charge carriers, which was confirmed by photoluminescence and photocurrent measurements, and from proper protection of the underlying Cu2O photocathode. Importantly, the Cu2O/g-C3N4heterojunction decorated by CoS proved to be effective for enhancing the stabilization of the Cu2O photocathode. About 90-95% of the photocurrent density was retained after 5 h of illumination and the faradaic efficiency for hydrogen evolution reached 80%. These results and protocols contribute to the progress of Cu2O-based photocathodes to be applied in high-efficiency solar hydrogen devices with prolonged photostability.</p

Kunturu, Pramod Patil

Huskens, Jurriaan

University of Twente Research Information

Improving Charge Separation in Cu2O/g-C3N4/CoS Photocathodes by a Z-Scheme Heterojunction to Achieve Enhanced Performance and Photostability

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Improving Charge Separation in Cu
                    2

http://www.scopus.com/inward/record.url?scp=85098794368&partnerID=8YFLogxK

Improving Charge Separation in Cu<sub>2</sub>O/g-C<sub>3</sub>N<sub>4</sub>/CoS Photocathodes by a Z-Scheme Heterojunction to Achieve Enhanced Performance and Photostability

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University of Twente Research Information

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