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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
Statement of
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
RMID: 0030105895
DOI: 10.1039/c8ta06921b
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Appears in Collections:Chemical Engineering publications

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