ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Weicheng Cui,Hongye Bai,Jianpeng Shang,Fagen Wang,Dongbo Xu,Jinrui Ding,Weiqiang Fan,Weidong Shi
Constructing the high-performance photoanode is critical to improve photoelectrochemical (PEC) efficiency, but it is still an inevitable challenge to rationally fabricate the organic-inorganic hybrid-photoanode system. For the first time, we report a novel hybrid-photoanode built from ultrathin NiFe-MOF and TiO 2 by a sacrifice template method. The in-situ etch of NiFe-layered double hydroxide (LDH) on the surface of TiO 2 has been successfully realized in the coordination environment, for creating coordinately unsaturated metal sites on NiFe-MOF. The coordinately unsaturated metal sites could significantly promote the water oxidation kinetic , compared with conventional electrode/electrolyte interface. The photocurrent density of the NiFe-MOF/TiO 2 has reached about 3.35 times of bare TiO 2 at 1.23 V (vs. RHE), and the incident photon to current conversion efficiency (IPCE) value has been improved up to 42% (at 390 nm). The significant augment of the charge injection ( η injection ) of 92.8% and charge separation ( η separation ) efficiency of 37.4% has also been exhibited. Moreover, NiFe-MOF/TiO 2 shows a long-term stability ( < 10% decay) after 4 h of continuous illumination. This work provided a novel and rational strategy about the integration of the inorganic semiconductor and organic MOF , which can provide a new insight into understanding MOF-based catalysts for PEC water splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Xueling Wei,Yuanhao Yang,Zhen Ma,Qiujie Li,Qian Sun,Dekai Zhang,Enzhou Liu,Hui Miao
Bismuth oxysulfide (Bi 2 O 2 S), as a unique new two-dimensional layered material, has gradually attracted the interest of researchers because of its excellent photoelectric properties. How to enhance its charge kinetics is the key to improve photoelectrochemical (PEC) properties. Herein, the cascade type II-I heterostructure of Bi 2 O 2 S/Bi 2 S 3 /ZnIn 2 S 4 O (oxygen doping) was rationally fabricated by oxygen doping for efficient PEC water splitting through one-step hydrothermal method. Bi 2 S 3 was in close contact with Bi 2 O 2 S through Bi atom sharing, while ZnIn 2 S 4 O has enhanced polarity. The double-synergistic effect of the cascade II-I heterojunction with strong interface interaction and asymmetric crystal modification could greatly promote the transfer efficiency of the surface charge and the bulk charge, inhibited the photogenerated carrier recombination, and enhanced the overall charge dynamics. The results showed that the photocurrent density of Bi 2 O 2 S/Bi 2 S 3 /ZnIn 2 S 4 O composite photoanode was 4.82 mA cm −2 under the condition of 1.23 V vs. RHE, which was 9.09 times with that of monomer Bi 2 O 2 S. This study opened up a new way for the application of Bi 2 O 2 S-based photoelectrodes in the field of PEC water splitting.
研究领域:
材料科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2024
·Vol. 43
·期 7
·3400-3407
·
IF 9.6
Chen Mo-Yan,Zhang Tai-Song,Yan Zhi,Lv Jiang-Nan,Sun Xiao-Ting,Yang Rui-Xia,Swihart Mark T.,Xu Xiao-Hong,Liu Yang
Graphical abstract
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
·
2024
·
IF 8.1
Jianglin Tu,Jinwang Li,Zhefei Pan,Xun Zhu,Dingding Ye,Yang Yang,Hong Wang,Liang An,Rong Chen,Qiang Liao
Photoelectrochemical water splitting represents a promising route for converting solar energy into hydrogen, but sluggish reaction kinetics associated with inefficient charge separation and migration, and poor stability limit solar-to-hydrogen conversion. In this work, we develop a N-doped-CdS/TiO 2 -nanorods heterojunction photoanode for photoelectrochemical water splitting by anchoring CdS on TiO 2 nanorods followed by nitrogen doping. The light harvesting is significantly enhanced and the charge separation and migration are promoted due to the formed heterojunction and nitrogen doping, which greatly enhances the water oxidation reaction. As a result, the photoelectrochemical cell with the optimized N-doped-CdS/TiO 2 -nanorods heterojunction photoanode yields a hydrogen production rate of 42.6 μmol cm −2 h −1 , which is 2.51 times higher than that of the TiO 2 -nanorods photoanode. In particular, doping nitrogen atoms into CdS greatly alleviates the photocorrosion problem. Therefore, the newly-developed photoanode exhibits excellent stability under a continuous 10-h running.
研究领域:
材料科学
·
能源转换技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Jingwei Huang,Tingting Liu,Rongfang Wang,Mingyi Zhang,Lei Wang,Houde She,Qizhao Wang
Cobalt oxide is an excellent water oxidation cocatalyst used in photoelectrochemical (PEC) water splitting field. Finding a facial way to load cobalt oxide on a semiconductor anode is important to effectively realize PEC water splitting on a large scale. In this work, a simple impregnation and calcination method is developed to fabricate CoO x /BiVO 4 anode. The constructed CoO x /BiVO 4 anode provides a photocurrent of 3.1 mA cm −2 at 1.23 V vs. RHE, about 2.8 times that of BiVO 4 anode (1.1 mA cm −2 ). Furthermore, both the charge separation and injection efficiency are improved by loading CoO x nanoparticles onto the BiVO 4 layer. Importantly, input voltage–output current characteristic curves are used for the first time to prove the formation of p-n junction between CoO x and BiVO 4 , which benefits to the separation of photogenerated holes and electrons. All results indicate that the impregnation and calcination method is efficacious for facile fabrication of CoO x /BiVO 4 photoanode with high performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Ziqi Zhong,Borui Du,Guowu Zhan,Jingran Xiao
Herein, the 3D printing technology is harnessed as a new and flexible strategy to fabricate a structural-parameter adjustable 3D-structured Ti-Fe 2 O 3 photoanode. The Ti alloy was discovered to be practicable during the synthesis of Ti-Fe 2 O 3 and enlisted as a substrate material for crafting a conical-array patterned Ti-Fe 2 O 3 photoanode. The conical array fashions an angle between the incident light (longitudinal side) and the photogenerated charge transport (transverse side), along with a considerably augmented light-receiving area. Significantly, the charge separation efficiency progressively escalates as the cone height augments. This undertaking accentuates the importance of modulating the parameter of a 3D-structured Fe 2 O 3 photoanode.
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
Advanced Materials Interfaces
·
2020
·Vol. 7
·期 6
·1901947
·
IF 4.948
Weiwei Xu,Wei Tian,Linxing Meng,Fengren Cao,Liang Li
Due to its suitable band energy level and small band gap, CdIn 2 S 4 is a promising photoanode for photoelectrochemical (PEC) water splitting. Nevertheless, the serious charge recombination at the back contact and photoelectrode/electrolyte interface severely hinders its PEC activity. Herein, a facile magnetron ion-sputtering strategy is adopted to fabricate TiO 2 underlayer and NiO overlayer to modify both sides of CdIn 2 S 4 photoanode. The TiO 2 underlayer serves as an electron transport layer to promote electrons transfer from CdIn 2 S 4 to fluorine-doped tin oxide substrate and hinder holes' transportation, thus suppressing the charge recombination at the back contact. NiO, as a p-type semiconductor, forms a p-n heterojunction with CdIn 2 S 4 , inducing a built-in electric field to facilitate charge transport. Meanwhile, NiO overlayer acts as a co-catalyst to enhance surface reaction kinetics, and thereby improves the carrier injection efficiency at photoelectrode/electrolyte interface. As a result, the optimum TiO 2 /CdIn 2 S 4 /NiO photoanode exhibits photocurrent as high as 0.6 mA cm −2 at 1.23 V versus reversible hydrogen electrode, which is about 2.3 times that of bare CdIn 2 S 4 . This work provides an effective strategy to manipulate the charge carrier dynamics to improve the PEC activity of photoanode.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8338-8346
·
IF 2.324
Song Kai,Ma Zizai,Yang Weiyou,Hou Huilin,Gao Fengmei
In the present work, we reported the fabrication of Fe-doped WO 3 nanofibers via a versatile electrospinning method towards efficient photoelectrochemical (PEC) water splitting. The resultant Fe-WO 3 nanofibers had a high purity in morphology, and the Fe doping levels within the WO 3 nanofibers were controlled in the range from 0.32 to 1.47 at.%, making the band gaps of WO 3 nanofibers tailored from 2.92 to 2.8 eV. The incorporated Fe dopants could not only increase the light absorption, but also improve the charge transport and charge transfer efficiencies, bringing an enhanced PEC activity of the WO 3 nanofiber photoanodes. The WO 3 nanofibers with the optimized 0.32 at.% Fe doping level exhibit the best PEC performance. The mechanism for the enhanced PEC behaviors was proposed.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Fan Liao,Yandi Shi,Qian Dang,Haiwei Yang,Hui Huang,Zhenhui Kang,Mingwang Shao
The dynamic behavior of electron-hole pairs at the interface of the nanocomposites is important for photoelectrochemical catalysis, but it is difficult to characterize. Here we construct a ternary titanium dioxide/nitrogen-doped carbon dot/gold (TiO 2 /NCD/Au) complex as the model catalyst to investigate the kinetic indexes at their interfaces. Under irradiation (200 mW cm −2 ), the photocurrent density of TiO 2 /NCD/Au is 10.26 mA cm −2 , which is higher than those of TiO 2 /Au (4.34 mA cm −2 ), TiO 2 /NCD (7.55 mA cm −2 ) and TiO 2 (3.34 mA cm −2 ). The evolved oxygen of TiO 2 /NCD/Au reaches 125.8 μmol after 5000 s test. The energy bands of complexes are very similar to that of the unmodified TiO 2 catalyst due to the low content modification of NCDs and Au. In addition, the transient photovoltage (TPV) tests with a series of control samples show differences about the carriers’ separation and transfer process, which verify that Au can increase the separation quantity of electron-hole pairs while NCDs play a more important role on the increase of the separation quantity and separation rate simultaneously. This work quantifies the function of each component in a composite catalyst and deepens the understanding of the catalyst interface design.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganics
·
2022
·Vol. 10
·期 12
·264
·
IF 3.149
Yangqin Gao,Guoqing Yang,Zhijie Tian,Hongying Zhu,Lianzheng Ma,Xuli Li,Ning Li,Lei Ge
The bare surface of BiVO4photoanode usually suffers from extremely low interfacial charge transfer efficiency which leads to a significantly suppressed photoelectrochemical water splitting performance. Various strategies, including surface modification and the loading of co-catalysts, facilitate the interface charge transfer process in BiVO4. In this study, we demonstrate that CoS2synthesized from the hydrothermal method can be used as a high-efficient co-catalyst to sufficiently improve the interface charge transfer efficiency in BiVO4. The photoelectrochemical water splitting performance of BiVO4was significantly improved after CoS2surface modification. The BiVO4/CoS2photoanode achieved an excellent photocurrent density of 5.2 mA/cm2at 1.23 V versus RHE under AM 1.5 G illumination, corresponding to a 3.7 times enhancement in photocurrent compared with bare BiVO4. The onset potential of the BiVO4/CoS2photoanode was also negatively shifted by 210 mV. The followed systematic combined optical and electrochemical characterization results reveal that the interfacial charge transfer efficiency of BiVO4was largely improved from less than 20% to more than 70% due tor CoS2surface modification. The further surface carrier dynamics study performed using an intensity modulated photocurrent spectroscopy displayed a 6–10 times suppression in surface recombination rate constants for CoS2modified BiVO4, which suggests that the key reason for the improved interfacial charge transfer efficiency possibly originates from the passivated surface states due to the coating of CoS2.Keywords:BiVO4;CoS2;photoelectrochemical water splitting;intensity modulated photocurrent spectroscopy;surface recombination
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2023
·
IF 4.6
Yao Liu,Ning Jiang,Mingjie Lyu,Jinwei Wei,Gongxiang Wei,Xin Han,Qiaoyan Shang,Qian Zhang,Yunyan Liu,Huiqiang Liu,Xifeng Shi
How to improve photon absorption , photoelectric conversion efficiency, and carrier separation and transfer efficiency is a huge challenge for promoting the efficiency of photoelectrochemical (PEC) water splitting. Herein, the black phosphorus nanosheets (BPNs) was assembled on the surface of TiO 2 nanorods arrays (TiO 2 NAs) through electrostatic attraction to form TiO 2 /BP heterojunction material. Meanwhile, Ag nanoparticles were successfully loaded on the surface of TiO 2 /BP heterojunction material to form Ag nanoparticles modified TiO 2 /BP heterojunction composite material. The TiO 2 /BP heterojunction modified by Ag nanoparticles nanostructures exhibited a remarkable enhancement in the PEC water splitting in comparison with the pristine TiO 2 . Photoelectrochemical performance at 1.23 V vs. RHE bias-potential under 100 mW cm −2 solar light illumination shows that synthesized Ag–TiO 2 /BP photoanode displaying the highest photocurrent density of 1.74 mA cm −2 , which is practically 3.34 times higher than that of pristine TiO 2 (0.52 mA cm −2 ), presenting a significantly improved PEC performance for water splitting. After 18 months, the photocurrent of synthesized Ag–TiO 2 /BP photoanode can still reach 1.63 mA cm −2 , and the performance is stable. It demonstrated that the formation of heterojunction by electrostatic attraction of TiO 2 and BP and then modification with Ag nanoparticles is an effective strategy for improving the 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
Nanomaterials
·
2023
·Vol. 13
·期 18
·2579
·
IF 5.3
Yue Chang,Minmin Han,Yehui Ding,Huiyun Wei,Dawei Zhang,Hong Luo,Xiaogang Li,Xiongbo Yan
Effectively regulating and promoting the charge separation and transfer of photoanodes is a key and challenging aspect of photoelectrochemical (PEC) water oxidation. Herein, a Ti-doped hematite photoanode with a CoFe-LDH cocatalyst loaded on the surface was prepared through a series of processes, including hydrothermal treatment, annealing and electrodeposition. The prepared CoFe-LDH/Ti:α-Fe2O3photoanode exhibited an outstanding photocurrent density of 3.06 mA/cm2at 1.23 VRHE, which is five times higher than that of α-Fe2O3alone. CoFe-LDH modification and Ti doping on hematite can boost the surface charge transfer efficiency, which is mainly attributed to the interface interaction between CoFe-LDH and Ti:α-Fe2O3. Furthermore, we investigated the role of Ti doping in enhancing the PEC performance of CoFe-LDH/Ti:α-Fe2O3. A series of characterizations and theoretical calculations revealed that, in addition to improving the electronic conductivity of the bulk material, Ti doping also further enhances the interface coupling of CoFe-LDH/α-Fe2O3and finely regulates the interfacial electronic structure. These changes promote the rapid extraction of holes from hematite and facilitate charge separation and transfer. The informative findings presented in this work provide valuable insights for the design and construction of hematite photoanodes, offering guidance for achieving excellent performance in photoelectrochemical (PEC) water oxidation.
研究领域:
材料科学
·
能源转换
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）