Boosting the photocatalytic hydrogen evolution performance via an atomically thin 2D heterojunction visualized by scanning photoelectrochemical microscopy

Jae Yoon Lee, Sungwoo Kang, Donghun Lee, Seokhoon Choi, Seunghoon Yang, Kangwon Kim, Yoon Seok Kim, Ki Chang Kwon, Soo ho Choi, Soo Min Kim, Jihoon Kim, Jungwon Park, Haeli Park, Woong Huh, Hee Seong Kang, Seong Won Lee, Hong-Gyu Park, Min Jae Ko, Hyeonsik Cheng, Seungwu HanHo Won Jang, Chul-Ho Lee

Research output: Contribution to journalArticle

Abstract

Heterojunction catalyst can facilitate efficient photoelectrochemical (PEC) hydrogen evolution by reducing a potential barrier for charge transfer at the semiconductor/electrolyte interface. Such a heterojunction effect at the atomic thickness limit has not yet been explored although it can be strengthened because of strong built-in field and ultrafast charge transfer across the junction. Here, we first investigate a novel strategy to boost the hydrogen evolution performance of the p-type WSe2 photocathode via reducing the overpotential with an atomically thin heterojunction catalyst comprising MoS2 and WS2 monolayers. To unveil an effective role of the heterojunction by isolating its kinetic contribution from other collective catalytic effects, we develop and utilize an in situ scanning PEC microscopy, which enables the spatially-resolved visualization of the enhanced photocatalytic hydrogen evolution performance of the heterojunction. Notably, significant reduction in overpotential, from +0.28 ± 0.03 to −0.04 ± 0.05 V versus (vs.) the reversible hydrogen electrode (RHE), is achieved when the MoS2/WS2 heterojunction is introduced as a catalyst even without intentional generation of catalytic sites. As a result, the photocurrent of ~4.0 mA cm−2 occurs even at 0 V vs. RHE. Furthermore, the beneficial effect of the atomically scaled vertical heterojunction is explained by the built-in potential resulted from efficient charge transfer in type-II heterojunctions with the support of first-principles calculations. Our demonstration not only offers an unprecedented approach to investigating the fundamental PEC characteristics in relation to the tailored properties of a catalyst but also proposes a new catalytic architecture, thereby enabling the design of highly efficient PEC systems.

Original languageEnglish
Article number104053
JournalNano Energy
Volume65
DOIs
Publication statusPublished - 2019 Nov 1

Fingerprint

Heterojunctions
Hydrogen
Microscopic examination
Scanning
Charge transfer
Catalysts
Electrodes
Photocathodes
Photocurrents
Electrolytes
Monolayers
Demonstrations
Visualization
Semiconductor materials
Kinetics

Keywords

  • Catalyst
  • Heterojunction
  • Photoelectrochemical hydrogen evolution
  • Spatially resolved PEC characterization
  • Transition metal dichalcogenides

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

Cite this

Boosting the photocatalytic hydrogen evolution performance via an atomically thin 2D heterojunction visualized by scanning photoelectrochemical microscopy. / Lee, Jae Yoon; Kang, Sungwoo; Lee, Donghun; Choi, Seokhoon; Yang, Seunghoon; Kim, Kangwon; Kim, Yoon Seok; Kwon, Ki Chang; Choi, Soo ho; Kim, Soo Min; Kim, Jihoon; Park, Jungwon; Park, Haeli; Huh, Woong; Kang, Hee Seong; Lee, Seong Won; Park, Hong-Gyu; Ko, Min Jae; Cheng, Hyeonsik; Han, Seungwu; Jang, Ho Won; Lee, Chul-Ho.

In: Nano Energy, Vol. 65, 104053, 01.11.2019.

Research output: Contribution to journalArticle

Lee, JY, Kang, S, Lee, D, Choi, S, Yang, S, Kim, K, Kim, YS, Kwon, KC, Choi, SH, Kim, SM, Kim, J, Park, J, Park, H, Huh, W, Kang, HS, Lee, SW, Park, H-G, Ko, MJ, Cheng, H, Han, S, Jang, HW & Lee, C-H 2019, 'Boosting the photocatalytic hydrogen evolution performance via an atomically thin 2D heterojunction visualized by scanning photoelectrochemical microscopy', Nano Energy, vol. 65, 104053. https://doi.org/10.1016/j.nanoen.2019.104053
Lee, Jae Yoon ; Kang, Sungwoo ; Lee, Donghun ; Choi, Seokhoon ; Yang, Seunghoon ; Kim, Kangwon ; Kim, Yoon Seok ; Kwon, Ki Chang ; Choi, Soo ho ; Kim, Soo Min ; Kim, Jihoon ; Park, Jungwon ; Park, Haeli ; Huh, Woong ; Kang, Hee Seong ; Lee, Seong Won ; Park, Hong-Gyu ; Ko, Min Jae ; Cheng, Hyeonsik ; Han, Seungwu ; Jang, Ho Won ; Lee, Chul-Ho. / Boosting the photocatalytic hydrogen evolution performance via an atomically thin 2D heterojunction visualized by scanning photoelectrochemical microscopy. In: Nano Energy. 2019 ; Vol. 65.
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AU - Kang, Sungwoo

AU - Lee, Donghun

AU - Choi, Seokhoon

AU - Yang, Seunghoon

AU - Kim, Kangwon

AU - Kim, Yoon Seok

AU - Kwon, Ki Chang

AU - Choi, Soo ho

AU - Kim, Soo Min

AU - Kim, Jihoon

AU - Park, Jungwon

AU - Park, Haeli

AU - Huh, Woong

AU - Kang, Hee Seong

AU - Lee, Seong Won

AU - Park, Hong-Gyu

AU - Ko, Min Jae

AU - Cheng, Hyeonsik

AU - Han, Seungwu

AU - Jang, Ho Won

AU - Lee, Chul-Ho

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