Efficient Improved Charge Separation of FeP Decorated Worm-Like Nanoporous BiVO 4 Photoanodes for Solar-Driven Water Spl
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Efficient Improved Charge Separation of FeP Decorated Worm‑Like Nanoporous BiVO4 Photoanodes for Solar‑Driven Water Splitting Jianhua Ge1,2 · Xiulong Ding1 · Daochuan Jiang2 · Lei Zhang2 · Pingwu Du2 Received: 4 July 2020 / Accepted: 17 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Photoelectrochemical (PEC) water splitting using B iVO4 semiconductor photoanodes have been appealed to plenty of attentions in the past few decades. In this study, FeP was used as an active precious-metal-free cocatalyst for the first time to enhance the performance of worm-like nanoporous BiVO4 photoanodes for PEC water splitting. Characterization results demonstrate that FeP nanoparticles were successfully deposited on surface of the pritine BiVO4 photoanodes, and served as an noble metal-free cocatalyst for solar-driven PEC water splitting. Furthermore, a maximum photocurrent density of ~ 3.05 mA/ cm2 at 1.23 V vs RHE could be achieved by loading moderate amount of FeP on the surface of B iVO4, which is about 1.6 times higher than that of the unmodified B iVO4. Meanwhile, the efficient suppression of surface recombination by FeP was also confirmed by the PEC measurements in Na2SO3 solution. The maximum ABPE of FeP/BiVO4 photoanodes was ~ 0.53% at 0.60 V vs RHE, indicating the potential application for overall solar-driven water splitting. Graphic Abstract
Keywords BiVO4 · Photoanodes · FeP · Water splitting · Charge separation
1 Introduction
* Jianhua Ge [email protected] * Pingwu Du [email protected] Extended author information available on the last page of the article
Since the groundbreaking work of Fujishima and Honda was published in 1972, photoelectrochemical (PEC) water splitting using semiconductor photoanodes materials to produce hydrogen and oxygen, is widely regarded as a promising route to settle the energy crisis worldwide in the future [1–6]. To date, a considerable number of photoanode
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materials, such as T iO2 [7–10], WO3 [11–14], α-Fe2O3 [15–18], Ta3N4 [19–23], and BiVO4 [24–26] and so on, have been extensively developed by scientists. Among these candidates, BiVO4, as an n-type semiconductor, is identified as a promising photoanode material for PEC water splitting, on account of its appropriate valance band level, visible-light response, excellent physicochemical stability, nontoxic, and low-cost. Unfortunately, bare BiVO4 photoanodes always suffer from sluggish charge mobility, and fast surface charge recombination at the interface of the photoanode [27]. Therefore, tremendous effective strategies have been adopted, including surface modification [25], together with other semiconductors [28], and element doping [29], to alleviate the bottleneck of bare B iVO4 photoanode. Specially, surface modification using cocatalysts, made up of earth-abundant elements, were considered as a convenient, low-cost and reproducible pathway to handled above-mentioned problems [24, 30–33]. For example, our group recently demonstrat
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