Black phosphorene as a hole extraction layer boosting solar water splitting of oxygen evolution catalysts

Kan Zhang (), Bingjun Jin, Cheolwoo Park, Yoonjun Cho, Xiufeng Song, Xinjian Shi, Shengli Zhang, Wooyul Kim, Haibo Zeng () and Jong Hyeok Park ()
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Kan Zhang: Nanjing University of Science and Technology
Bingjun Jin: Yonsei University
Cheolwoo Park: Sookmyung Women’s University
Yoonjun Cho: Yonsei University
Xiufeng Song: Nanjing University of Science and Technology
Xinjian Shi: Stanford University
Shengli Zhang: Nanjing University of Science and Technology
Wooyul Kim: Sookmyung Women’s University
Haibo Zeng: Nanjing University of Science and Technology
Jong Hyeok Park: Yonsei University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: Abstract As the development of oxygen evolution co-catalysts (OECs) is being actively undertaken, the tailored integration of those OECs with photoanodes is expected to be a plausible avenue for achieving highly efficient solar-assisted water splitting. Here, we demonstrate that a black phosphorene (BP) layer, inserted between the OEC and BiVO4 can improve the photoelectrochemical performance of pre-optimized OEC/BiVO4 (OEC: NiOOH, MnOx, and CoOOH) systems by 1.2∼1.6-fold, while the OEC overlayer, in turn, can suppress BP self-oxidation to achieve a high durability. A photocurrent density of 4.48 mA·cm−2 at 1.23 V vs reversible hydrogen electrode (RHE) is achieved by the NiOOH/BP/BiVO4 photoanode. It is found that the intrinsic p-type BP can boost hole extraction from BiVO4 and prolong holes trapping lifetime on BiVO4 surface. This work sheds light on the design of BP-based devices for application in solar to fuel conversion, and also suggests a promising nexus between semiconductor and electrocatalyst.

Date: 2019
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DOI: 10.1038/s41467-019-10034-1

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