CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yunni Liu,Qian Li,Zichao Lian,Jinchen Fan,Ying Tao,Guisheng Li,Hexing Li
Polarization field introduced photoelectrocatalytic system has been raised and applied for environmental purification and green fuel generation. Herein, we synthesized the Ag 2 O/TiO 2 nanotubes arrays (TNTs) p - n heterojunction photoanodes and innovatively introduced the SrTiO 3 (STO) as a relay to construct a highly stable PEC system. The SrTiO 3 layers with the ferroelectric properties were inserted in the interfaces between p-Ag 2 O and n-TiO 2 , creating a charge-stable polarized electric field thereby maintaining a constant driving force that promoted the effctive separation of electron and hole between SrTiO 3 and TNTs, and prevented the electron transfer from SrTiO 3 to Ag 2 O. Controlling suitable annealing and regulating hydrothermal time could induce SrTiO 3 spontaneous polarization, resulting in effective photoinduced charge separation. Consequently, the as-designed TNTs/STO/Ag 2 O photoanodes exhibited excellent PEC activity and stability (>40 h) for both persistent organic pollutants degradation and synergistic hydrogen evolution owing to the strengthened charge carrier capture ability of solar light and improved photocurrent density.
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高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Lingxin Peng,Liang Su,Xu Yu,Rongyan Wang,Xiangzhi Cui,Han Tian,Shaowen Cao,Bao Yu Xia,Jianlin Shi
Developing efficient electrocatalysts is of significance for hydrogen production in acid electrolyte. In this work, we report a facile decoration of ruthenium species onto tungsten oxides to construct the Mott-Schottky heterojunction electrocatalyst for hydrogen evolution. The resultant Ru-WO 2.72 hybrid exhibits a superior Ru-based mass activity of 161.6 times higher than that of commercial Ru/C for hydrogen evolution, featuring a Tafel slope of 50 mV dec −1 and 40 mV overpotential at the current density of 10 mA cm −2 . The uniform distribution of Ru species triggers a strong electron transfer across the Ru-WO 2.72 Schottky barrier, resulting in a largely increased local electron density on the active Ru surface. Such electron enrichment induced by the Mott-Schottky effect at the metal-metal oxides interface is responsible for enhanced hydrogen production. This work demonstrates an effective strategy by Mott-Schottky effect to regulate electron distribution, which would evoke more inspiration in designing efficient electrocatalysis and beyond.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Boxuan Yang,Xian Li,Zhongqiu Hua,Zhemin Li,Xiangnan He,Rui Yan,Yanhao Li,Zinan Zhi,Chen Tian
Agricultural activities produce substantial amounts of ammonia (NH 3 ), affecting agricultural ecology and resulting in environmental pollution. NH 3 detection based on sensor technology in the field has long been a challenging topic. Detection can be hampered by multiple interfering gases, as well as fluctuations in temperature and humidity, which can cause signal failure. Here, a simple and systematized NH 3 monitor coupled with a differential catalytic conversion method was designed to efficiently and continuously monitor NH 3 , independently of changes in the external environment. Overall, the catalytic conversion method of NH 3 into NO 2 increased the recognition of NH 3 and excluded most interfering gases. With the addition of differential processing , the detection results were further refined by eliminating the influence of oxidizing interfering gases, temperature, and humidity. This method can be applied in various demanding environments to obtain accurate results and eliminate the background interference that has long plagued sensor research.
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高影响因子
Processes
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2022
·Vol. 10
·期 4
·668
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IF 3.352
Ruigan Hu,Fuyue Liu,Haoqi Qiu,He Miao,Qin Wang,Houcheng Zhang,Fu Wang,Jinliang Yuan
The progress of high-efficiency non-precious metal anode catalysts for direct seawater splitting is of great importance. However, due to the slow oxygen evolution reaction (OER) kinetics, competition of chlorine evolution reaction (ClER), and corrosion of chloride ions on the anode, the direct seawater splitting faces many challenges. Herein, we develop a perovskite@NiFe layered double hydroxide composite for anode catalyst based on Ba0.5Sr0.5Co0.8Fe0.2O3(BSCF) and NiFe layered double hydroxide (NiFe-LDH) heterostructure. The optimized BSCF@CeO2@NiFe exhibits excellent OER activity, with the potential at 100 mA cm−2(Ej = 100) being 1.62 V in the alkaline natural seawater. Moreover, the electrolytic cell composed of BSCF@CeO2@NiFe anode shows an excellent stability, with negligible attenuation during the long-term overall seawater splitting with the remarkable self-recovery ability in the initial operation stage, and the direct seawater splitting potential increasing by about 30 mV at 10 mA cm−2. Our work can give a guidance for the design and preparation of anode catalysts for the direct seawater splitting.Keywords:seawater electrolysis;perovskites;layered double hydroxide;oxygen evolution reaction;anode catalysts
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Yun Wu,Rui Yao,Qiang Zhao,Jinping Li,Guang Liu
The development of high-performance and durable Ru-based electrocatalysts in proton exchange membrane (PEM) water electrolyzers for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) remains a huge challenge due to the severe catalyst’s corrosion and high reaction overpotential in acid media. Herein, we reported a synergistic strategy of effectively combining hetero-atom doping and oxygen vacancy in the La-doped RuO 2 nanocrystals, successfully realized by a hydrothermal and followed annealing process aiming for efficiently overall water splitting. The as-obtained La-doped RuO 2 nanocrystals demonstrate superior electrocatalytic performances with ultra-low overpotential of 208 mV for OER and 71 mV for HER at the current density of 10 mA/cm 2 together with robust long-term stability in 0.5 M H 2 SO 4 electrolyte, which are 222 and 15 mV lower in overpotentials than that of bare RuO 2 electrocatalyst. Moreover, the La-doped RuO 2 nanocrystals only require a cell voltage of 1.53 V to drive the overall water splitting reaction and exhibit a remarkable stability. Density functional theory (DFT) calculations further reveal that the synergistic effect of La doping and oxygen vacancy engineering could tune the d-band center of Ru active sites and optimize the Gibbs free energy of intermediate state, thus enhancing the activity of RuO 2 . Such synergistic strategy of aliovalent doping and vacancy engineering for much enhanced acid electrocatalysis may offer important referential values for exploring efficient electrocatalysts towards overall water splitting in acidic media.
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高影响因子
ACS Applied Materials & Interfaces
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2022
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IF 10.383
Zhuo Liu,Fei Guo,Lina Han,Jie Xiao,Xiaoyuan Zeng,Chengxu Zhang,Peng Dong,Mian Li,Yingjie Zhang
Along with the widespread applications of various energy storage and conversion devices, the prices of precious metal platinum (Pt) and transition-metal cobalt/nickel keep continuously growing. In the future, designing high-efficiency nonprecious-metal catalysts based on low-cost iron (Fe) and manganese (Mn) metals for hydrogen evolution reaction (HER) and oxygen reduction reaction (ORR) is fairly critical for commercial applications of hydrogen fuel cells. In this study, for the first time, we design novel three-dimensional (3D) hybrid networks consisting of manganese oxide (MnO)-modified, iron carbide (Fe3C)-embedded, and boron (B)/nitrogen (N) codoped hierarchically porous carbon nanofibers (denoted FeMn@BNPCFs). After optimizing the pyrolysis temperatures, the optimal FeMn@BNPCFs-900 catalyst displays the best HER and ORR catalytic activities in an alkaline solution. As expected, the HER onset potential (Eonset) and the potential at a current density of −10 mA cm–2 for FeMn@BNPCFs-900 in 1.0 M KOH are just 36 and 194 mV more negative than the state-of-the-art 20 wt % Pt/C catalyst with more superior stability. In particular, the FeMn@BNPCFs-900 catalyst shows excellent ORR catalytic activity with a more positive Eonset (0.946 V vs RHE), a more positive half-wave potential (E1/2 = 0.868 V vs RHE), better long-term stability, and higher methanol tolerance surpassing the commercial 20 wt % Pt/C (Eonset = 0.943 V vs RHE, E1/2 = 0.854 V vs RHE) and most previously reported precious-metal-free catalysts in 0.1 M KOH. The synergistic effects of 3D hierarchically macro-/mesoporous architectures, advanced charge transport capacity, abundant carbon defects/edges, abundant B (2.3 atom %) and N (4.9 atom %) dopants, uniformly dispersed Fe3C@BNC NPs, and MnO nanocrystallines are responsible for the excellent HER/ORR catalytic activities of the FeMn@BNPCFs-900 catalyst.
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高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Zhuozheng Hong,Zili Xu,Zhengtao Wu,Hao Zhang,Ping Li,Xun Xu,Shuwang Duo
Tungsten-based nitrides are ideal hydrogen evolution reaction (HER) electrocatalysts owing to their Pt-like electronic structures, high electrical conductivity, and good corrosion resistance. However, the conventional preparation of tungsten-based nitride electrocatalysts suffers from environmentally hazardous sources and high-temperature nitridation processes, which usually restrict HER activity. Herein, we report the direct synthesis of W 2 N on metal–organic framework (MOF)-derived Co-NC microarrays using magnetron sputtering. Co-NC microarray support increased the number of surface activity sites that were exposed to W 2 N. Moreover, the formation of Co-NC@W 2 N Schottky heterojunctions significantly facilitated charge transfer between Co-NC and W 2 N. The Co-NC@W 2 N heterojunctions showed outstanding HER activity with an overpotential of 55 mV in reaching a current density of 10 mA cm −2 . Notably, Co-NC@W 2 N exhibited superior HER performance to Pt/C catalyst at high current densities. This study provides a simple and environmentally friendly approach for fabricating high-performance metal-nitride catalysts for water splitting.
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高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Yu Liu,Yingying Xing,Xinyu Zheng,Shengjie Xu,Di Li,Deli Jiang
Designing high-performance and earth-abundant bifunctional catalysts for electrocatalytic water splitting remains a great challenge. Herein, a novel electrode composed of Cr-doped Co 2 P with P vacancies nanowire arrays (denoted as CrCo 2 P(V p ) NWs) grown on nickel foam was fabricated via a hydrothermal and successive calcination method. The Cr doping and vacancy engineering synergistically enable the exposure of more active sites, optimize electronic structure, and accelerate the charge transport capability, thus enhancing the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances. As a result, the obtained Cr 0.4 Co 2 P(V p ) NWs catalyst exhibits superior catalytic activities in 1.0 M KOH solution with low overpotentials of 37 mV at −10 mA cm −2 for HER and 253 mV at 20 mA cm −2 for OER, respectively. Furthermore, using Cr 0.4 Co 2 P(V p ) NWs as a dual-function catalyst only requires 1.54 V voltage at 10 mA cm −2 for overall water splitting. Notably, the Cr 0.4 Co 2 P(V p ) NWs catalyst displays satisfactory stability with only a small attenuation of 3.2% after 50 h in a constant current testing. This study highlights the synergistic effect between doping and anion-vacancies in the enhancement of electrocatalytic activities and provides a feasible strategy to design effective, earth-abundant, and stable bifunctional electrocatalysts for water splitting.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Tianping Wang,Zhen Zhang,Xiangnan Wang,Weiwen Wang,Tian Ma,Xikui Liu
Highly effective electrocatalysts are of vital importance for advanced applications. Here we show that fully π-conjugated dense topological salophen organic frameworks with atomic dispersed tetradentate cobalt sites in-situ growth on Kejtenblack are high-efficiency and durable electrocatalyst for the oxygen reduction, with a remarkable half-wave potential of 0.959 V which surpassing that of benchmark Pt/C catalyst, and is among the highest of reported single atom electrocatalysts. The electron transfer number was 3.92–3.99 and the yield of peroxide remains below 4% in 0.40–0.95 V. When employed as a cathode electrocatalyst for zinc-air batteries, it showed a high open-circuit voltage (1.5558 V) and maximum power density (178 mWcm −2 ) and high specific capacity (804 mAhg zn −1 ). The work reported here revealed that tailoring the active centers, conjugated structures, building blocks and topologies at atomic level could synergistically enhance the ORR activity which are highly valuable for zinc–air batteries and fuel cells.
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高影响因子
RENEWABLE ENERGY
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2022
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IF 8.634
Yuanting Lei,Lili Zhang,Danni Zhou,Chengli Xiong,Yafei Zhao,Wenxing Chen,Xu Xiang,Huishan Shang,Bing Zhang
Electrocatalytic overall water splitting is considered to be a promising strategy for hydrogen production . However, the development of high-efficient and robust bifunctional catalysts with earth-abundant elements for water splitting is of great significance. Herein, interconnected CoFe alloy nanosheets supported on NiO nanosheets (NiO/CoFe alloy) were synthesized on carbon cloth via a simple electrochemical activation of NiO/CoFe-layered double hydroxide (NiO/CoFe-LDH). The as-prepared NiO/CoFe alloy exhibits excellent activity and durability toward HER (hydrogen evolution reaction) and OER (oxygen evolution reaction). Impressively, it requires comparatively low overpotentials of 218 and 280 mV to deliver the current density of 10 and 30 mA cm −2 for HER and OER in 1.0 M KOH, respectively. The superior catalytic behavior may derive from the interconnected nanosheets structure, abundant exposed active sites, and the fast electron transfer of NiO/CoFe alloy. This work may shed light on the rational construction and design of precious metal-free catalysts with remarkable performance for overall water splitting and beyond.
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高影响因子
CRYSTENGCOMM
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2022
·Vol. 24
·期 35
·6178-6186
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IF 3.756
Yaoyao Pan,Xiaoyu Huang,Yin Huang,Congyi Sheng,Xiuhua Wang
The design of efficient, stable, and non-noble metal-based bifunctional electrocatalysts remains a great challenge. The synergistic effect can adjust the local electronic structure to improve the catalytic performance. In this work, an Fe Prussian blue analog was grown in situ on the surface of NiCo precursor nanoneedles at room temperature, and then one-dimensional unique NiCoP@FeP hierarchical nanocomposites were constructed by subsequent phosphating. The optimized NiCoP@FeP with strong electronic interactions showed a low overpotential of 268 mV at 50 mA cm−2 for the OER and 75 mV at 10 mA cm−2 for the HER. Moreover, for water splitting, the bifunctional catalyst required only a low cell voltage of 1.58 V to reach a current density of 10 mA cm−2 with excellent durability. This work provides a new synthesis strategy to construct non-noble metal heterostructure bifunctional electrocatalysts using the Prussian blue analog in the future.
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Frontiers of Optoelectronics
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2022
·Vol. 15
·期 1
·1-9
·
IF 0
Zhou Xingwei,Zhang Wei,Zhang Zunhao,Wang Zizhun,Zou Xu,Li Dabing,Zheng Weitao
The oriented two-dimensional porous nitrogen-doped carbon embedded with CoS 2 and MoS 2 nanosheets is a highly efficient bifunctional electrocatalyst. The hierarchical structure ensures fast mass transfer capacity in improving the electrocatalytic activity. And the greatly increased specific surface area is beneficial to expose more electrocatalytically active atoms. For oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) tests in 1 mol/L KOH solution, only 194 and 140 mV overpotential are required to achieve a current density of 10 mA/cm 2 , respectively. Our research provides an effective strategy for synergizing the individual components in nanostructures for a wide range of electrocatalytic reactions. Graphical Abstract
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