INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2019
·Vol. 43
·期 6
·2162-2171
·
IF 3.343
Wei Li,Shu-ao He,Xiao Wang,Qiong Ma,Chen-hui Zhao
Summary β-iron oxide hydroxide (β-FeOOH) had been proven to be an effective co-catalyst during H 2 evolution reaction (HER) process. In this research, a BiOCl/β-FeOOH heterojunction was successfully synthesized by a solid-state doping method. Then, the structure, composition, and photo-electrochemical properties of the prepared photocatalysts were studied. For the superior HER photocatalytic activity of ultrasmall β-FeOOH nanoparticles (NPs) and the formation of the BiOCl/β-FeOOH heterojunction, this heterojunction photocatalyst exhibited very superior photocatalytic performance in the HER process. Especially, when the amount of incorporated β-FeOOH NPs was appropriate, the BFOH-2 possessed the highest photocatalytic activity in HER process, and the HER rate was about 16.64 mmol·g −1 ·h −1 during illuminated time of 6 hours under visible light. When appropriate, ultrasmall β-FeOOH NPs were implanted into the structure of BiOCl, the BiOCl/β-FeOOH heterojunction interfaces would form for the existence of interfacial interactions. Therefore, this BiOCl/β-FeOOH heterojunction exhibited superior visible-light response, fast photo-carrier migration, and high-efficient separation of photo-carriers, so that the BFOH-2 heterojunction possessed high-efficient hydrogen evolution reaction (HER) photocatalytic activity.
研究领域:
材料科学
·
光催化
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DOI
高影响因子
Catalysts
·
2022
·Vol. 12
·期 9
·998
·
IF 4.501
Mengfan Niu,Liyun Cao,Qianqian Liu,Xiaoyi Li,Qian Chen,Dinghan Liu,Wenbin Li,Jianfeng Huang,Liangliang Feng
Exploring low-cost and highly active, cost-effective cocatalysts is of great significance to improve the hydrogen evolution performance of semiconductor photocatalysts. Herein, a novel ultrasmall V-doped NiP2nanoparticle, as an efficient cocatalyst, is reported to largely upgrade the photocatalytic hydrogen evolution reaction (HER) of g-C3N4nanosheets under visible-light irradiation. Experimental results demonstrate that V-NiP2cocatalyst can enhance the visible-light absorption ability, facilitate the separation of photo-generated electron-hole pairs and boost the transfer ability of electrons of g-C3N4. Moreover, the V-NiP2/g-C3N4hybrid exhibits prominent photocatalytic HER activity 17 times higher than the pristine g-C3N4counterpart, even outperforming the 1 wt.% platinum-loaded g-C3N4. This work displays that noble-metal-free V-NiP2cocatalyst can serve as a promising and efficient alternative to Pt for high-efficiency photocatalytic H2evolution.Keywords:g-C3N4;cocatalyst;V-NiP2;photocatalyst;hydrogen evolution reaction
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Energy Chemistry
·
2024
·
IF 14
Dong Zhang,Minghui Zhu,Ran Qin,Peixian Chen,Maoye Yin,Dafeng Zhang,Junchang Liu,Hengshuai Li,Xipeng Pu,Peiqing Cai
Rational design of photocatalyst to maximize the use of sunlight is one of the issues to be solved in photocatalysis technology. In this study, the CuFe 2 O 4 @C/Cd 0.9 Zn 0.1 S (CFO@C/CZS) S-scheme photocatalyst with photothermal effect was synthesized by ultrasonic self-assembly combined with calcination. The dark CFO@C absorbed visible light and partly converted into heat to promote the hydrogen evolution reaction. The presence of heterojunctions inhibited the photogenerated electron-hole recombination. The graphite-carbon layer provided a stable channel for electron transfer, and the presence of magnetic CFO made recycle easier. Under the action of photothermal assistance and heterojunction, the hydrogen evolution rate of the optimal CFO@C/CZS was 80.79 mmol g −1 h −1 , which was 2.55 times and 260.61 times of that of pure CZS and CFO@C, respectively. Notably, the composite samples also exhibit excellent stability and a wide range of environmental adaptability. Through experimental tests and first-principles simulation calculation methods, the plausible mechanism of photoactivity enhancement was proposed. This work provided a feasible strategy of photothermal assistance for the development of heterojunction photocatalysts with distinctive hydrogen evolution.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Lianqing Yu,Wenjing Xie,Xiaomeng Ji,Yaping Zhang,Haifeng Zhu
The availability of low-cost precious metal-free photocatalysts is critical for sustainable and large-scale hydrogen production. Constructing heterojunctions is considered as an effective strategy to enhance the transfer/separation of photo-induced charges. Nanoflower structures of ZnCdS can significantly enhance light absorption and increase the specific surface area available for reactions involving photo-generated carriers. Herein, MoS 2 are attached to ZnCdS nanoflowers through electrostatic adsorption, forming a ZnCdS-MoS 2 composite photocatalyst for hydrogen evolution reaction (HER). Under visible light irradiation, the ZCS-MoS 2 -8 % photocatalyst demonstrates an impressive photocatalytic HER rate of 42.07 mmol·h −1 ·g −1 , which is 5.8 times higher than that of the pure ZnCdS photocatalyst (outperforming many reported results). The MoS 2 nanocrystals greatly benefit the transfer of photoinduced electrons to ZnCdS for proton reduction and facilitate the transfer of holes for water oxidation. The constructed ZnCdS-MoS 2 photocatalyst for hydrogen evolution shows promising chemical and economic value.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Zhijie Zhang,Simin Chen,Sipeng Chen,Zeyu Yuan,Yanxiong Fang,Dai Dang,Yuying Zheng
Designing an electrocatalyst for hydrogen production from water splitting that is highly efficient, stable, and free of noble metals is necessary but challenging. The phosphorus compound is considered a viable candidate for producing hydrogen from water split, but its electrocatalytic performance needs further improvement. Herein, we present an easy and straightforward method for constructing Mn-doped Co 2 P yolk-shell lychee spheres. The Co nano prisms are used as a self-sacrificing template to conduct an ion exchange reaction with manganese ions, constructing Co oxide yolk-shell spheres with Mn–Co hydroxide nano-blocks. After in-suit phosphating at low temperature, Mn-doped Co 2 P with yolk-shell structure and lychee morphology is formed. The Mn-doped Co 2 P with an optimized Mn and Co molar ratio (0.125) exhibits excellent hydrogen evolution performance in alkaline and acidic electrolyte. The overpotentials can reach 10 mA cm −2 at 98 mV and 72 mV, respectively, and the Mn–Co 2 P-0.125 catalyst has faster electron transfer efficiency and larger electrochemically active surface area. The experimental results ascertain that doping an appropriate amount of Mn significantly changes the morphology and structure, thereby affecting the exposure of active sites, and modulating the electronic structure around Co 2 P. Under the dual regulation of morphology and electronic structure, the electrocatalytic process is accelerated, enhancing its catalytic activity .
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Hairus Abdullah,Riski Titian Ginting,Refi Ikhtiari,Noto Susanto Gultom,Hardy Shuwanto,Dong-Hau Kuo
Configurational entropy composites of In-doped Zn(O,S)/Zn-doped In(OH) 3-x S x has been synthesized with a one-step hydrothermal method and carefully characterized with XRD , XPS , SEM, TEM, DRS , PL , EIS , TPC , CV , and MS analyses. The composites were prepared with different sulfur amounts to obtain the optimum performance of visible-light photocatalytic HER . The primary phases of ZnS and In(OH) 3 were formed after the hydrothermal process. However, the results indicated In and O were doped into ZnS lattice and induced lower bandgap values (~2.71–2.84 eV) which are active in visible-light illumination. Simultaneously, the excess Zn and S were also doped to In(OH) 3 with lower bandgap values (~3.38–4.63 eV). The variation of bandgap values is due to the hybridization of In 5s5p to Zn 4s4p and O 2p to S 3p orbitals. As a result, In-doped Zn(O,S) and Zn-doped In(OH) 3-x S x will be a visible-light active material for photoreaction and a favorable phase for electron transfer , respectively. Furthermore, it is also related to a possible antisite-defect formation with I n Z n + to help the electron trapping and enhance the photocarrier separation, leading to an efficient photocatalytic activity . ZI-S1 with additional 5-mmol thioacetamide was found as the catalyst with the highest HER performance which achieved 730 μmol/g·h under visible-light illumination. A plausible photocatalytic HER mechanism is discussed and proposed in this work.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 15
·3206-3213
·
IF 4.674
Ying-Hua Zhou,Suqin Wang,Zhiyan Zhang,Nicholas Williams,Yong Cheng,Jing Gu
Graphical Layer of darkness : Pd nanoparticles (NPs) are highly dispersed onto the hollow NiCo layered double hydroxide (LDH) derived from ZIF-67 through an in situ reduction method. The nanocomposite exhibits superior catalytic performance for hydrogen generation from ammonia borane in aqueous solution at room temperature. Although ammonia borane (NH 3 BH 3 , AB) has been identified as an excellent hydrogen-storage medium, the development of a highly active catalyst that can function under mild conditions for controllable hydrogen release is still a great challenge. The synergistic effect induced by interactions between metal nanoparticles and a support has been widely applied in thermocatalytic conversion processes. In this work, Pd nanoparticles (NPs) highly dispersed on hollow NiCo layered double hydroxide (LDH) were designed for efficient hydrogen generation from AB at room temperature. During the hydrolytic dehydrogenation of AB, Pd/α-LDH and Pd/β-LDH exhibited catalytic activities with total turnover frequency (TOF) values of 49.5 and 28.1 min −1 with activation energy ( E a ) values of 20.56 and 37.56 kJ mol −1 , respectively, at 298 K; thus, these catalysts outperform most Pd-based catalysts. The improved catalytic effect was attributed to the controllable size and fine distribution of the Pd NPs and the collaborative effect provided by the hydroxide of α-LDH and the intercalated anions (HO − ). This catalysts design principle can be easily transferred to other catalyst research fields for energy-conversion and -storage purposes.
研究领域:
材料科学
·
催化化学
·
能源转换与存储
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 21
·11489-11497
·
IF 2.936
Hui Li,Lihua Liu,Ziqun Wang,Xiuzhen Zheng,Sugang Meng,Shifu Chen,Xianliang Fu
Although the CdS photocatalyst has been extensively investigated, a rational hydrothermal synthesis route is still required to prepare highly active CdS for H2 evolution reaction (HER). To optimize the precursor of the sulfur source, three prevalent organic sulfur sources of thiourea (TA), thioacetamide (TAA) and L-cysteine (L-Cys) were used for hydrothermal synthesis of CdS. Their effects on the crystallographic structure, morphology, optical property, band structure, and photocatalytic HER performance of the products were then investigated systematically. The results indicated that hexagonal branched dendritic structure CdS (S-TA) could be produced in TA solution and showed the highest HER activity due to the branched 1D structure, the smallest interfacial electron transfer resistance and the most negative conduction band bottom (Ecb). Whereas in TAA, spherical CdS (S-TAA) with a mixed phase of hexagonal and cubic was obtained. The mixed phase structure and the more positive Ecb of S-TAA lead to a considerably lower HER activity than that of S-TA. Poorly crystallized hexagonal CdS nanoparticles (S-Cys) were prepared in L-Cys and showed the lowest HER performance as its Ecb is very near to H+ reduction potential. Thus, compared to T-AA and L-Cys, TA is a more suitable sulfur source for hydrothermal preparation of highly active CdS for HER.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
PubMed
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 8
·3506-3513
·
IF 6.97
Manyi Gao,Yongsheng Yu,Weiwei Yang,Ji Li,Shichong Xu,Ming Feng,Haibo Li
The development of a robust and low-cost non-noble metal catalyst for photocatalytic H2 evolution is of great importance for practical applications. In this study, monodisperse Ni nanoparticles of controlled sizes were prepared by a facile method and anchored on graphitic carbon nitride (g-C3N4) nanosheets via a self-assembly route. The noble-metal-free Ni/g-C3N4 composite catalysts exhibit excellent photocatalytic activities for the hydrolytic dehydrogenation of ammonia borane (AB) under visible light. An optimum AB hydrolysis rate was obtained when the size of the Ni NPs was 3.2 nm, with an initial turnover frequency of 18.7 mol(hydrogen) mol(catalyst)−1 min−1 and an apparent activation energy of 36 kJ mol−1. This study provides validity for constructing high performance first-row transition metal nano-photocatalysts for the hydrolytic dehydrogenation of AB.
研究领域:
化学
·
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
·
IF 14.229
Riyue Ge,Wenxian Li,Juanjuan Huo,Ting Liao,Ningyan Cheng,Yi Du,Mingyuan Zhu,Ying Li,Jiujun Zhang
Efficient photo-electrocatalysts for hydrogen evolution reaction (HER) are synthesized using a facile one-step hydrothermal method. With metal-ion bridges, highly dispersed molybdenum disulfide (MoS 2 ) nanolayers are vertically grown on the reduced graphene oxide (RGO) to form RGO-M-MoS 2 photocatalysts for HER, where M = Fe 3+ , Co 2+ , Ni 2+ , Cu 2+ and Zn 2+ . The results show that the cross-bridging ions can modulate the MoS 2 growth priority and act as efficient charge transfer channels between RGO and MoS 2 , and combine the advantages of the high conductivity of graphene with the photo-electrochemical activity of MoS 2 . The metal-ion bridged MoS 2 -M-RGO heterostructures demonstrate superior catalytic activity toward hydrogen evolution reaction in acid medium, evidenced by the remarkable higher catalytic current density at low overpotential compared with that of MoS 2 -RGO without metal-ion bridge. This study provides a novel and facile route for establishing efficient composite photo-electrocatalysts for water splitting to generate hydrogen.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2020
·
IF 8.821
Jinqiao Li,Xiaoteng Liu,Huinan Che,Chunbo Liu,Chunxiang Li
Realizing the efficient utilization of photogenerated carriers is a pivotal process to access the efficient transformation of light energy . Herein, we firstly practice a facile template method to synthesize O-doped crystalline/none-crystalline g-C 3 N 4 embedded nano-homojunction photocatalysts (CMCCN-x). This nano-homojunction makes the crystalline phase sufficiently contact with amorphous phase and further facilitates the photoinduced electron transformation. Therefore, the best performance catalyst CMCCN-5 well integrates the advantages of crystal g-C 3 N 4 and amorphous g-C 3 N 4 , which exhibits an excellent photogenerated carrier separation ability and abundant photocatalytic hydrogen evolution reaction activity sites. Excellent performance in the separation and use of photogenic carriers endows CMCCN-5 with efficient utilization of photogenerated carriers. Although there is a limited light absorption range (<460 nm), the photocatalytic hydrogen evolution rate of CMCCN-5 is up to 203.66 μmol h −1 under the visible light irradiation, about 86 times higher than pristine g-C 3 N 4 . The AQY numbers of CMCCN-5 at 420 nm and 450 nm are up to 26.9% and 14.0%, respectively. Thus, the significant effectiveness is forcefully proved for the facile construction of O-doped g-C 3 N 4 crystalline/none-crystalline nano-homojunction.
研究领域:
材料科学
·
光催化
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 12
·8951-8962
·
IF 2.993
Wang Hongzhi,Zhou Haibin,Zhang Weiguo,Yao Suwei
Amorphous molybdenum sulfide on P-doped carbon nanotubes (MoS
x
/P-CNTs) composite with an original leaves–branch architecture for hydrogen evolution reaction (HER) is successfully fabricated by urea-assisted synthesis via a facile hydrothermal process. It is found that urea used in the process of preparation played a crucial role in the establishment of this unique structure, where leaves-like MoS
x
nanosheets are uniformly anchored on P-CNTs substrate. Besides, the optimal amount of MoS
x
on P-CNTs bundles is investigated in this paper. Due to the synergistic coupling effects of MoS
x
nanosheets and P-CNTs bundles, as a result, the unique structure maintains abundant active sites, a high electrical conductivity as well as distinctive electrons transport mechanism, which gives the optimum MoS
x
/P-CNTs composite, a higher activity for HER with an overpotential of 151 mV (vs. RHE) to reach a current density of 10 mA cm −2 and a smaller Tafel slope of 49 mV dec −1 . Stability tests indicate that the catalyst exhibits excellent electrochemical durability in 0.5 M H 2 SO 4 solution. We envision that this work could provide new insights into the rational design of MoS
x
-based electrocatalysts for energy conversion and storage.
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
危险品化学品经营许可证（带存储）