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https://hdl.handle.net/2440/117738
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Type: | Journal article |
Title: | A comparative study of metal (Ni, Co, or Mn)-borate catalysts and their photodeposition on rGO/ZnO nanoarrays for photoelectrochemical water splitting |
Author: | Zhang, H. Tian, W. Li, Y. Sun, H. Tadé, M. Wang, S. |
Citation: | Journal of Materials Chemistry A, 2018; 6(47):24149-24156 |
Publisher: | Royal Society of Chemistry |
Issue Date: | 2018 |
ISSN: | 2050-7488 2050-7496 |
Statement of Responsibility: | Huayang Zhang, Wenjie Tian, Yunguo Li, Hongqi Sun, Moses O. Tadéa and Shaobin Wang |
Abstract: | Feasible and efficient photoelectrochemical (PEC) water splitting demands a rational integration of solar light absorbers with active electrocatalysts. Herein, we first compare three amorphous metal-borates (M-Bi, M = Ni, Co, Mn) as low-cost electrocatalysts, among which Mn-Bi is proposed for the first time for fabrication of new PEC devices for oxygen evolution reaction (OER). Density functional theory (DFT) calculations compared the catalytic activity of the effective structures in M-Bi and found that NiO6 possesses kinetically the lowest overall OER energy barrier. Experimentally, M-Bi thin layers were self-assembled on reduced graphene oxide (rGO) linked ZnO nanorod arrays respectively, to form a highly efficient ternary PEC system (M-Bi/rGO/ZnO) using a modified photodeposition method. rGO facilitates the fast charge separation in light-absorbing ZnO NAs, while M-Bi (M = Ni, Co, Mn) can improve the kinetics of OER. In accordance with DFT results, Ni-Bi serves as the most active electrocatalyst in such a PEC device, followed by Co-Bi and Mn-Bi. Compared to ZnO, the photoelectroconversion efficiency is elevated by approximately 4 times on Ni-Bi/rGO/ZnO, with its onset potential migrated by 0.17 V in the cathodic direction under one sun illumination. |
Rights: | This journal is © The Royal Society of Chemistry 2018 |
DOI: | 10.1039/c8ta06921b |
Grant ID: | http://purl.org/au-research/grants/arc/DP150103026 http://purl.org/au-research/grants/arc/LE120100026 |
Published version: | http://dx.doi.org/10.1039/c8ta06921b |
Appears in Collections: | Aurora harvest 8 Chemical Engineering publications |
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