CHINESE JOURNAL OF CATALYSIS
·
2018
·
IF 3.525
Jingwei Li,Qiuna Zhuang,Peiman Xu,Dawei Zhang,Licheng Wei,Dingsheng Yuan
Designing low-cost, highly efficient, and stable bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is of vital significance for water splitting. Herein, three-dimensional lily-like CoNi 2 S 4 supported on nickel foam (CoNi 2 S 4 /Ni) has been fabricated by sulfuration of the Co–Ni precursor. As expected, CoNi 2 S 4 /Ni possesses such outstanding electrocatalytic properties that it requires an overpotential of only 54 mV at 10 mA cm −2 and 328 mV at 100 mA cm −2 for HER and OER, respectively. Furthermore, by utilizing the CoNi 2 S 4 /Ni electrodes as bifunctional electrocatalysts for overall water splitting, a current density of 10 mA cm −2 can be obtained at a voltage of only 1.56 V.
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
·
2023
·
IF 7.2
Yanan Chen,Luofu Min,Wen Zhang,Li Xu,Yuxin Wang
Electrochemical water splitting using renewable energy is considered a key technology to mitigate global warming and to realize the hydrogen economy . Extensive efforts have been devoted to finding high-performance electrode catalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) involved in electrochemical water splitting, whereas the research on added components in the electrolyte to boost HER and/or OER is very limited. In this work, we report the use of 18-crown ether-6 (18C6) in the electrolyte as a bifunctional booster in water splitting. The addition of 18C6 in alkaline electrolyte drastically boosts HER current density from −50 to −300 mA cm −2 at −0.3 V vs. RHE and OER current density from 25 to 250 mA cm −2 at 1.7 V vs. RHE on the Ni foam electrode. Combing DFT calculations and experimental characterizations, the functions of 18C6 in boosting HER and OER on nickel electrodes under the alkaline condition are revealed. This research demonstrates the potential of macrocycle molecules as electrolyte additives and opens up new opportunities for boosting the performance of water splitting.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Shuo Geng,Yarong Huang,Akhmat Fauzi,Yongsheng Yu,Yequn Liu,Weiwei Yang
The synthesis of highly efficient non-noble bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in the same electrolyte is important for the industrial application of electrocatalytic water splitting. Herein, non-noble bifunctional electrocatalyst Ni 0.67 Co 0.33 (PO 3 ) 2 nets with optimized morphology were successfully synthesized. Owing to the micropores with the accelerated electrolyte and gases transfer and nanopores architecture with more exposed active edge sites, the self-supported Ni 0.67 Co 0.33 (PO 3 ) 2 -12 h electrode exhibits a superior water splitting performance. Impressively, the Ni 0.67 Co 0.33 (PO 3 ) 2 -12 h electrode only needs a cell voltage of 1.46 V to achieve 10 mA/cm 2 and shows over 22 h stability at 10, 50 and 100 mA/cm 2 , respectively. This present work suggests a unique and earth abundant material synthesis method for water electrolysis, which has broad prospects for practical water splitting application.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Peiyun Zhou,Guangtong Hai,Gongchi Zhao,Rushuo Li,Xiubing Huang,Yunfeng Lu,Ge Wang
Developing multifunctional electrocatalysts with excellent hydrogen evolution reaction (HER), oxygen evolution reaction (OER) and 5-hydroxymethylfurfural oxidation reaction (HMFOR) activities will contribute to "carbon neutrality". Here, CeO 2 is introduced into the Co 4 N system as an "electron pump" to attract electrons to transfer from Co 4 N to CeO 2 . The interface electronic structure optimization enables Co 4 N@CeO 2 to exhibit excellent HER, OER, and HMFOR performance. Specifically, to deliver 10 mA cm −2 current density, (1) it only requires low overpotentials of 49 and 263 mV for HER and OER in 1.0 M KOH, respectively; (2) it merely needs an ultra-low potential of 1.22 V RHE for HMFOR in 1.0 M KOH + 300 mM HMF, which is 273 mV lower than the required potential in 1.0 M KOH. Theoretical calculation results show that the introduction of CeO 2 effectively reduces the barriers for potential-determining steps of HER and OER, and optimizes OH - adsorption to promote the HMFOR process.
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
Materials Chemistry Frontiers
·
2021
·Vol. 5
·期 12
·4571-4578
·
IF 6.482
Mengyao Su,Xinyuan Li,Meng Xu,Xiaodong Wan,Hongzhi Wang,Bing Bai,Hongpan Rong,Jiajia Liu,Jia Liu,Jiatao Zhang
Lattice-mismatch-directed hybrid metal@semiconductor core–shell nanocrystals with extended scope of diversity in composition and morphologies are critical to create more function integrations and applications. The case of metal@telluride hetero-nanostructures are more typical due to the electronegativity and electron affinity of tellurium, which are impediment of the telluride shell synthesis in the aqueous phase. Herein, we take advantage of the aqueous cation exchange (ACE) synthetic strategy, have synthesized Au@PbTe core–shell nanocrystals with engineering of amorphous/crystalline phase and shape evolution facilely. By controlling the kinetics of the ACE-enabled hydrothermal CE strategy and the starting phase/composition of Au@Ag2Te nanostructures, we also achieved core–shell to yolk–shell evolution with different Au core sizes and hollow PbTe shells. These plasmonic core–shell nanostructures with a suitable telluride shell thickness demonstrated potential applications in surface enhanced Raman scattering.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Nan Wang,Xiangjie Bo,Ming Zhou
The development of cost-effective Pt-based electrocatalysts is of great scientific and industrial significance for improving the electrocatalytic activity of hydrogen evolution (HER) and oxygen evolution (OER) reactions for overall water splitting. In this work, unlike traditional furnace pyrolysis, we report the rapid and single-step room-temperature synthesis of Pt/VC nanocomposites with a three-dimensional (3D) network porous structure by laser irradiation technology. The resultant Pt-based composite (Pt/VC-2.84) could be applied to HER under different pH conditions. In particular, the content of Pt in Pt/VC-2.84 is only 2.84 wt %, which is far lower than that in the advanced HER electrocatalyst with the Pt content of 20 wt % (commercial 20 wt % Pt/C). In addition, Pt/VC-2.84 exhibits a boosted higher OER activity and stability than RuO2 in an alkaline medium. Most importantly, electrocatalytic results reflect that Pt/VC-2.84 reveals superior activity and stability toward overall water splitting.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IONICS
·
2019
·Vol. 26
·期 1
·301-309
·
IF 2.289
Peng Canwei,Huang Run,Pan Guangxing,Liu Wenbin,Wang Li
Water electrolysis was recognized as an effective method for new energy sources. In this work, an effective Fe x Ni y OOH/ESS with high surface area and good catalytic activity was prepared for water electrolysis. Its morphologies at different ratio of Fe/Ni atoms were diverse, such as flower ball, flake, and block, etc. Test results showed that at 10 mA cm −2 and 300 mA cm −2 , the hydrogen evolution overpotentials of Fe 1.5 Ni 0.5 OOH/ESS were 172 mV and 258 mV. The oxygen evolution overpotentials of Fe 0.2 Ni 1.8 OOH/ESS were 208 mV and 308 mV at 10 mA cm −2 and 600 mA cm −2 . During the 136-h stability test, the oxygen evolution activity of Fe 0.2 Ni 1.8 OOH/ESS was basically unchanged. The Fe 1.5 Ni 0.5 OOH//Fe 0.2 Ni 1.8 OOH in alkaline conditions presented good performance for water electrolysis. Water electrolysis experiment was carried out at 1.58 V, and the current density reached to 10 mA cm −2 . Fe x Ni y OOH/ESS exhibited higher electrocatalytic activity and superior stability at high current density.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 41
·16057-16063
·
IF 8.262
Fulin Yang,Pingping Zhao,Xing Hua,Wei Luo,Gongzhen Cheng,Wei Xing,Shengli Chen
The design of high-efficiency non-precious electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is extremely important for developing sustainable energy technologies. Herein, we report a metal–organic framework (MOF) template carbonization route to prepare a Co-based hybrid electrocatalyst with superior performance for both HER and OER in an alkaline solution. Starting from a carbon nanotube (CNT) inserted Co MOF, the Co-NC/CNT hybrid with a N-doped carbon nanoframe composed of hollow Co nanoparticles interlinked by CNTs is first synthesized via carbonization. This unique 3D structure is shown to have highly exposed active sites and good conductivity. Most importantly, the Co-NC/CNT hybrid can act as bifunctional catalysts on both anode and cathode for electrochemical water splitting, to deliver a current density of 10 mA cm−2 under a cell voltage as low as 1.625 V.
研究领域:
材料科学
·
能源技术
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 2
·1022-1029
·
IF 3.361
Hai Zhong,Guofeng Cheng,Guangcai Ma,Enhui Wu,Zhuo Zhang,Xuefeng She,Shuqiang Jiao,Jingsong Wang,Qingguo Xue
Developing electrocatalytic nanomaterials for green H2 energy is inseparable from the exploration of novel materials and internal mechanisms for catalytic enhancement. In this work, nano-petal N-doped bi-metal (Ni, Co) and bi-valence (+2, +3) (Ni1−xCox)2+Co23+O4 compounds have been in situ grown on the surface of Ni foam. The N3− atoms originate from the amino group in urea and doped in the compound during annealing. The as-synthesized N-doped (Ni1−xCox)2+Co23+O4 nano-petals demonstrate commendable hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) bi-functional catalytic efficiency and stability. Electrochemical measurements confirm that the nitrogen doping significantly improves the catalytic kinetics and the surface area. Density functional theory calculations reveal that the improved HER and OER kinetics is not only due to the synergistic effect of bi-metal and bi-valence, as well as the introduction of defects such as oxygen vacancies, but also it more depends on the shortened bond length between the nitrogen N3− atoms and the metal atoms, and the increased electron density of the metal atoms attached to the N3− atoms. In other words, the change of lattice parameters caused by nitrogen doping is more conducive to the catalytic enhancement than the synergistic effect brought by bi-metal. This study provides an experimental and theoretical reference for the design of bi-functional electrocatalytic nanomaterials.
研究领域:
材料科学
·
催化化学
·
能源科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Hao Liu,Cong Xi,Jinghua Xin,Guoliang Zhang,Shaofei Zhang,Zhijia Zhang,Qin Huang,Jianxin Li,Hui Liu,Jianli Kang
Although significant progresses have been achieved recently in developing efficient catalysts for electrochemical water splitting, high performance catalysts toward hydrogen evolution and oxygen evolution in alkaline electrolyte at high current density (≧1000 mA cm −2 ) have been seldom realized. Herein, we report a flexible and free-standing nanoporous NiMnFeMo alloy (np-NiMnFeMo) with ultrahigh catalytic activity as both anode and cathode even at high current density. The nanoporous NiMnFeMo alloy can deliver as high as 1000 mA cm −2 at an overpotential of only 290 mV for hydrogen evolution reaction and 570 mV for oxygen evolution reaction. DFT calculations indicate that the ultrahigh HER activity of the catalyst is originated from the synergetic effect of the solid solution elements, where Ni atoms act as water dissociation center in the np-NiMnFeMo and the other metals (Mn, Fe and Mo) regulate the electronic structure and provide superior adsorption properties towards hydrogen. More importantly, the electrolyzer, assembled using the np-alloys as both cathode and anode for full water splitting, shows excellent stability.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 18
·8898-8905
·
IF 6.97
Luhong Fu,Xin Hu,Yunbo Li,Gongzhen Cheng,Wei Luo
Developing highly efficient and durable electrocatalysts for overall water splitting over a wide pH range is of great interest for practical applications, but still remains a challenge. Specifically, to the best of our knowledge, a 3-in-1 electrocatalyst that can efficiently catalyze overall water splitting in acidic, alkaline, and neutral electrolytes has not been reported so far. Herein, we report the colloidal synthesis of well-dispersed IrW nanobranches with branch architectures and describe how the morphology varies with the amount of W doping. As expected, they exhibit outstanding catalytic performance and durability for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) at all pH values, which are much higher than those of Ir nanoparticles (NPs), and most reported state-of-the-art electrocatalysts. More importantly, when further used as both an anode and cathode for overall water splitting in 0.1 M HClO4, 0.1 M KOH, and 1.0 M PBS (phosphate buffer solution), cell voltages of 1.58, 1.60, and 1.73 V, respectively, were achieved at a current density of 10 mA cm−2. The present work opens up a new avenue for designing electrocatalysts for pH-universal overall water splitting, especially for application in highly corrosive acidic media and neutral media with limited ionic concentrations.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 10
·期 1
·325-334
·
IF 7.779
Zhida Li,Chunyue Zhang,Yang Yang,Shanshan Pi,Yongjie Yu,Chengfeng Wan,Baiqin Zhou,Weixiang Chao,Lu Lu
Cobalt phosphides (CoPx) as a representative of transition metal phosphide (TMP) catalysts show great potential for highly-efficient electrocatalytic water splitting for H2 production. However, the current synthetic strategies of CoPx are complex and time-consuming. Herein, a novel, facile and fast molten salt strategy for one-step synthesis of CoPx (CoP/Co2P) was first proposed. Moreover, the molten salt's strong polarization force endows CoPx with abundant phosphorus vacancy (PV) defects. The synthesized CoPx show impressive catalytic activities towards both the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) under alkaline conditions. This enables the overall water splitting to reach the current densities of 10 and 100 mA cm−2 driven by only 1.75 and 1.90 V voltage, respectively. Mechanism investigation reveals that PV defects lead to the optimization of the electronic structure, decreased energy barriers of intermediates’ formation, and enhanced electronic conductivity, all of which boost the electrocatalytic activity. This study provides a paradigm of using molten salt for the synthesis of advanced TMPs, which not only simplifies the synthetic procedures, but also provides insight into defect engineering that involves the use of molten salt medium to obtain a better activity.
研究领域:
材料科学
·
电化学
·
能源材料
✓ 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）