Catalysis Science & Technology
·
2018
·Vol. 8
·期 5
·1395-1403
·
IF 5.365
Yanyan Duan,Shaochen Zhou,Zhihong Chen,Jianmin Luo,Mei Zhang,Fu Wang,Tao Xu,Chuanyi Wang
An efficient photoelectrochemical water splitting system is developed based on a hierarchical TiO2 nanowire/microflower (H-TiO2) photoanode, which is synthesized via a one-step hydrothermal process. The H-TiO2 structure is formed via three primary self-assembly processes and simultaneously offers excellent ultraviolet light absorption capacity and large specific surface area. The H-TiO2 photoanode achieves a 1.3 fold enhancement in photocurrent density compared to its TiO2 nanowire-based counterpart at 1.23 V vs. reversible hydrogen electrode (the theoretical potential for water electrolysis). More strikingly, by incorporating the surface plasmon resonance (SPR) effect from Au nanoparticles (NPs), the resulting Au/H-TiO2-based photoanodes (Au/H-TiO2) exhibit an about two-fold enhancement in photocurrent density under both simulated sunlight and visible-light illumination. Moreover, the maximum photoconversion efficiency of Au/H-TiO2 gives three fold enhancement compared to that in the absence of Au NPs. Significantly, Au NPs incorporated on the H-TiO2 surface also serve as co-catalysts like Pt under white-light illumination, reducing the onset potential by about 0.15 V and the current saturation potential by about 0.18 V. The enhanced photoactivity under white light is due to the co-action of electron transfer from the efficient carrier separation of H-TiO2 (ultraviolet part) and Au to H-TiO2 under the SPR effect (visible part). The present study provides a new strategy for designing and fabricating TiO2-based devices with favorable energy conversion efficiency for photoelectrochemical water splitting.
研究领域:
材料科学
·
能源科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Wanqing Fang,Li Fu,Ai Qin,Yimin Lin,Rongzi Xv
Photoelectrochemical (PEC) water splitting has become an attractive way to sustainable hydrogen production. Herein, a cobalt ion-doped BiVO4 photoanode (Co:BiVO4) is prepared by an electrodeposition-solution drop-casting strategy. Co:BiVO4 presents a three-dimensional coral sheet structure with Co3O4 particles on the surface. The surface will be covered with an ultrathin cobalt borate (CoBi) film after PEC testing in borate buffer. The photocurrent density of Co:BiVO4 reaches 4.45 mA/cm2 at 1.23 VRHE (2.46 times that of BiVO4). Co:BiVO4 also exhibits self-healing properties in borate buffer during the PEC test. The excellent PEC performance of the Co:BiVO4 photoanode is due to the synergy effect caused by Co doping. Some of the Co ions are doped into the BiVO4 lattice to increase the electronic conductivity. Excess Co ions form the Co3O4 co-catalyst on the BiVO4 surface to promote the water oxidation reaction. After PEC testing in borate buffer, the CoBi film covering the Co:BiVO4 surface acts as a co-catalyst to provide more active sites for water oxidation. The applied bias photon-to-current efficiency, charge separation, and injection efficiency of the Co:BiVO4 photoanode are 0.94%, 63.19%, and 87.73% (3.62, 2.39, and 2.95 times that of bare BiVO4). This work provides a wealth of insights into the influence of Co:BiVO4 on PEC water oxidation in borate buffer and demonstrates the self-healing function of the system.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 40
·23038-23045
·
IF 10.733
Rongrong Pan,Jia Liu,Yuemei Li,Xinyuan Li,Erhuan Zhang,Qiumei Di,Mengyao Su,Jiatao Zhang
Here we show a novel strategy for tailoring the synergistic electrical properties of metal@semiconductor hybrid nanocrystals (HNCs) based on cation exchange-enabled electronic doping. As a demonstration, the conductive nature of Au@CdS core–shell HNCs was changed from n- to p-type by introducing Cu dopants into the CdS shell. The dependence of the conductivity type on the dopant concentration in the HNCs is disclosed by combined photoelectrochemical (PEC) studies. Moreover, a tandem PEC cell consisting of an undoped Au@CdS photoanode and a Cu-doped Au@CdS photocathode respectively modified with cocatalysts is fabricated, which displayed stable H2 and O2 evolution in unassisted PEC overall water splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Li Xu,Meihua Li,Fangming Zhao,Jingjing Quan,Xingming Ning,Pei Chen,Zhongwei An,Xinbing Chen
The loading of transition metal oxyhydroxide (TMOH) on semiconductor (SC) is a promising strategy for fabricating desired photoelectrochemical (PEC) devices. Nevertheless, the inevitable charge recombination occurring at SC/TMOH interface severely hinders the carrier transfer. Herein, differing from the conventional multi-step hole capture process, a novel transition metal-based interfacial regulation layer with low oxidation state species is introduced for boosted charge separation. As expected, the optimized BiVO 4 /Cu-CoO x /FeNiOOH photoanode obtains a photocurrent density of 6.60 mA/cm 2 at 1.23 V versus reversible hydrogen electrode (RHE) accompanied with outstanding photostability. In-situ ultraviolet/visible-spectroelectrochemistry, electrochemical analyses, and density functional theory (DFT) show that the Cu-CoO x , like “charge transporter”, can directly modulate charge transfer pathway and quickly transfer hole from BiVO 4 to FeNiOOH surface for PEC water splitting. Moreover, the approach can be extended to other Cu-NiO x and Mn-CoO x , proving its universality. This work provides an effective strategy to design efficient and stable photoanodes for water splitting.
研究领域:
材料科学
·
电化学
·
理论计算
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Huilin Niu,Lili Gao,Mingming Liu,Yuqi Zou,Jiaoli Wang,Guowen Hu,Jun Jin
Enhancing carrier separation and transport efficiency to achieve efficient water oxidation reaction is an important issue in photoelectrochemical (PEC) water splitting field, and introducing hole transfer layer (HTL) is an effective strategy to improve it. However, the difficulty of charge transfer between HTL and oxygen evolution catalyst (OEC) is a problem unresolved. To ameliorate the situation, we choose CoOOH as HTL and the metal–organic coordination compound constructed by 4,5-Imidazoledicarboxylic acid (IA) and Co/Ni ions as OEC. Using the interfacial coordination bonds as carrier transfer channels, the holes were rapidly extracted from HTL to OEC containing abundant active sites and participate in oxidation reaction. In consequence, the unique design results in a photocurrent density of 2.97 times that of α-Fe 2 O 3 at 1.23 V RHE for the IACN/CoOOH/Fe 2 O 3 . This study reveals how the advisable design of photoanode promotes interfacial charge transfer and provides a valuable reference for the design of composite photoanode.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Separations
·
2024
·Vol. 11
·期 4
·109
·
IF 2.5
Li Xu,Jingjing Quan,Li Xu,Meihua Li,Chenglong Li,Saqib Mujtaba,Xingming Ning,Pei Chen,Qiang Weng,Zhongwei An,Xinbing Chen
Surface-coupled transition metal oxyhydroxide (TMOOH) on semiconductor (SC)-based photoanodes are effective strategies for improving photoelectrochemical (PEC) performance. However, there is a substantial difference between the current density and theoretical value due to the inevitable interfacial charge recombination of SC/TMOOH. Here, we employ BiVO4/FeNiOOH as a model, constructing the BiVO4/MnOx/CoOx/FeNiOOH integrated system by introducing a novel hetero-interface regulation unit, i.e., MnOx/CoOx. As expected, the optimized integrated system demonstrates a photocurrent density as high as 5.0 mA/cm2at 1.23 V versus the reversible hydrogen electrode (RHE) under 1 sun AM 1.5G illumination, accompanied by 12-h stability. The detailed electrochemical analysis and intensity modulated photocurrent spectroscopy (IMPS) have confirmed that the high PEC performance mainly originates from the hetero-interface structure, which not only suppresses the interfacial charge recombination by accelerating the photogenerated hole transfer kinetics from BiVO4to FeNiOOH but promotes the kinetics of surface oxygen evolution reaction (OER). Notably, these findings can also be extended to other structures (CeOx/CoOx), reflecting its universality. This finding has provided a new insight into the highly efficient solar energy conversion in the SC/TMOOH system.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Qi Wang,Lanlan Zhang,Yuhong He,Zonghan Hu,Yangfang Liao,Qingping Dai,Bing Lv,Wenzhong Wang
Rational design and construction of semiconductor heterojunction photoelectrode can effectively improve photoelectrochemical (PEC) water splitting for hydrogen evolution . In this study, for the first time, a novel n-type Fe 2 V 4 O 13 (FVO) nanoparticle-modified p-type CuInS 2 (CIS) nanosheet arrays (NSAs) photocathode is designed and constructed for hydrogen evolution through PEC cell . The CIS/FVO NSAs photocathode simultaneously with type II heterojunction and p-n junction was constructed by growing FVO nanoparticles (NPs) on CIS NSAs through a facile successive ionic layer adsorption and reaction (SILAR) as well as annealing method. The designed and constructed CIS/FVO NSAs photocathode exhibited drastically improved PEC water splitting for hydrogen evolution and generated a photocurrent of −4.8 mA/cm 2 , 9.5 times that of pristine CIS NSAs photocathode at −1.0 V vs. Ag/AgCl. UV–vis absorption spectrum tests demonstrated the outstanding light absorption of CIS/FVO NSAs within the wavelength of 300–800 nm. Electrochemical impedance and photoluminescence measurements evidenced the effective separation of the carriers within the CIS/FVO NSAs. Mott-Schottky tests confirmed the establishment of type II heterojunction between the interface of p-type CIS and n-type FVO. The experimental tests revealed that the enhanced PEC water splitting performance of the CIS/FVO NSAs photocathode is attributed to the outstanding light absorption and the effective charge carrier separation achieved by type II heterojunction and p-n junction. This work provides a new strategy to design and construct CIS-based photocathode for highly efficient PEC water splitting hydrogen evolution.
研究领域:
材料科学
·
能源科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Dan Wang,Hanlin Wang,Juanjuan Fan,Hancheng Zhu,Akira Fujishima,Xintong Zhang
Photoelectrochemical (PEC) performance of photoanode is limited by the cascade-dynamic processes, mainly including light absorption , charge separation, and surface reaction. This work adopted a strategy of nanocones modification on FTO substrate (FTO-NC) to enhance light utilization and photoelectrons collection for improved PEC water splitting . Comparative studies showed that FTO-NC enhanced the light scattering, promoting the conversion process of photon to electron/hole and enlarging the effective surface area of BiVO 4 for surface reaction. Meanwhile, cooperative Mo-doping and Co-MOF decoration improved the bulk electron transportation in BiVO 4 , hole migration towards the electrode surface , and accelerated the water oxidation reaction of photogenerated holes. The photocurrent density of FTO-NC/BiVO 4 -Mo/MOFs reached 3.56 mA cm −2 , 6.14 times that of pristine BiVO 4 . The IPCE of FTO-NC/BiVO 4 -Mo/MOFs photoanode achieve 60% at 1.23 V vs. RHE, demonstrating a significantly enhanced light utilization performance. This work presents new insight into boosting cascade-dynamic processes through collaborative strategies for highly efficient PEC water-splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Lin Yang,Yuli Xiong,Hongmei Dong,Huarong Peng,Yunhuai Zhang,Peng Xiao
Monoclinic bismuth vanadate (BiVO 4 ) is a promising semiconductor for photoelectrochemical water splitting . Here, we developed a facile fabrication of BiVO 4 double layer photoanode on the fluorine-doped tin oxide substrate by electrodeposition . The BiVO 4 double layer photoanode is composed by a dense BiVO 4 film as the inner layer and a nanoporous BiVO 4 film as the outer layer. Compared to the BiVO 4 single layer photoanode, the optimized BiVO 4 double layer photoanode produced a much higher photocurrent of 1.15 mA/cm 2 at 0.6 V vs. Ag/AgCl under AM 1.5G (100 mW/cm 2 ) illumination. The results of the photoelectric conversion kinetics for different samples revealed that the charge separation and oxidation kinetics efficiencies for the BiVO 4 double layer are 47.2% and 51.6% at 0.6 V vs. Ag/AgCl, while the values for BiVO 4 single layer are 32.3% and 35.8%, respectively. The improved photoelectrochemical performance for BiVO 4 double layer is mainly ascribed to the decrease of defect state at the interface after inserting a dense BiVO 4 as an inner layer to prevent the recombination of photogenerated electron-hole pairs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2019
·
IF 7.723
Yixuan Gao,Shihao Zhang,Yishi Wu,Yang Tian,Hongbing Fu,Sihui Zhan
Photoelectrochemical (PEC) water splitting via semiconductors is an effective and feasible method for synthesizing renewable hydrogen (H 2 ) fuels. In this study, β-In 2 S 3 nanosheets were first grown on conductive glass. Then, we prepared P-doped β-In 2 S 3 nanosheets with an amorphous InPO x overlayer via the incomplete phosphorization of pristine β-In 2 S 3 nanosheets. When we used this material as photoanode in a PEC cell for water splitting, the photocurrent density drastically increased to 2.2 mA cm −2 at 1.23 V versus a reversible hydrogen electrode (vs. RHE). It enhanced 15 times as the pristine β-In 2 S 3 nanosheets, which was only 0.15 mA cm −2 at 1.23 V vs. RHE (solar standard spectrum, 100 mW cm −2 ). The photoelectric conversion efficiency as high as 0.65% at a low potential of 0.81 V vs. RHE was achieved for the phosphorized β-In 2 S 3 nanosheets. A series of experiments proved that the P-doping accelerated semiconductor charge-transport and the InPO x overlayer played cocatalyst role. We penetratingly investigated the pathway of charge transfer via femtosecond transient absorption. The results showed one pathway of charge transfer in pristine β-In 2 S 3 photoanode. However, there were two pathways (core/shell coupling and shallow trap states) for charge transfer in the phosphorized β-In 2 S 3 photoanode, which improved the performance of its PEC water oxidation.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 7
·4302-4308
·
IF 6.895
Yajun Pang,Wenjie Zang,Zongkui Kou,Lei Zhang,Guangqing Xu,Jun Lv,Xiaorui Gao,Zhenghui Pan,John Wang,Yucheng Wu
Low photoconversion efficiency, high charge transfer resistance and fast recombination rate are the bottlenecks of semiconductor nanomaterials in photoelectrochemical (PEC) water splitting, where the introduction of an appropriate co-catalyst is an effective strategy to improve their performance. In the present study, we have purposely designed atomic-scale dispersed bismuth (Bi) assembled on titanium dioxide nanorods (TiO2), and demonstrated its effective role as a co-catalyst in enhancing the PEC water splitting performance of TiO2. As a result, functionalized Bi/TiO2 generates a high photocurrent intensity at 1.23 VRHE under simulated solar light irradiation, which is 4-fold higher than that of pristine TiO2, exhibiting a significantly improved PEC performance for water splitting. The strategy presented in this study opens a new window for the construction of non-precious metals dispersed at atomic scales as efficient co-catalysts for realizing sustainable solar energy-driven energy conversion and storage.
研究领域:
材料科学
·
能源转换与存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chinese Physics B
·
2023
·Vol. 32
·期 11
·118201
·
IF 1.7
Wei Jin,Liyuan Zhang,Wenjing Zhang,Qian Sun,Dekai Zhang,Hui Miao,Xiaoyun Hu
As a traditional n-type semiconductor, TiO2 has good UV absorption ability and stable physical and chemical properties. However, its wide band gap and low oxygen evolution reaction (OER) activity limit its application in the field of photoelectrochemical (PEC) water splitting. In this work, a type-II TiO2/CuNi2S4 heterojunction photoanode is successfully constructed, which expanded the light absorption range to visible and enhanced the OER activity. Firstly, TiO2 nanotubes (NTs) thin films are prepared on Ti substrates by two-step anodization, and then the bi-functional electrocatalytic material CuNi2S4 is grown on TiO2 NTs in the shape of nanosheets (NSs) in situ by solvothermal method. As a bi-functional electrocatalytic material, CuNi2S4 has good visible light absorption property as well as OER catalytic activity. Compared with TiO2, the IPCE value of TiO2/CuNi2S4 is 2.59% at 635 nm, and that of TiO2 is a mere 0.002%. The separation efficiency and injection efficiency increase from 2.49% and 31.52% to 3.61% and 87.77%, respectively. At 1.23 V vs. RHE, the maximum photocurrent density is 0.26 mA/cm2, which is 2.6 times than that of TiO2 (0.11 mA/cm2), and can be maintained at 0.25 mA/cm2 for at least 2 h under light illumination. Moreover, a hydrogen production rate of 4.21 μmol⋅cm−2⋅h−1 is achieved within 2 h. This work provides a new idea for the application of TiO2 in the field of PEC water splitting and the construction of efficient and stable photoelectronic devices.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）