DALTON TRANSACTIONS
·
2023
·Vol. 52
·期 28
·9714-9720
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IF 4
Sirui Liu,Yuxin Shi,Lingling Xu,Weican Zhan,Meixi Chen,Xiaoyue Pan,Yuqing Yao,Jiajie Cai,Mingyi Zhang,Xinzhi Ma
Designing an excellent OER catalyst in an alkaline environment is severe yet essential for industrial H2 application under the electrochemical technique. This study has achieved multiple modifications on CoN nanowires, the classic OER catalyst, via a facile room-temperature NaBH4 spontaneous hydrolysis. This facile process simultaneously generates oxygen vacancies and robust BN species. It wraps hydrophilic BOx motifs on the OER response CoN nanowires, producing OER active Co–N–B species, increasing active numbers and guaranteeing structural stability. It suggests that a low NaBH4 concentration (0.1 mol L−1) treatment endows CoNNWAs/CC with excellent OER performance and robust structure, which can drive a current density of 50 mA cm−2 with only 325 mV overpotentials with more than 24 hours’ durability. Even, the catalyst can drive 1000 mA cm−2 around 480 mV overpotential. This study allows a novel strategy for designing high-performance OER catalysts.
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jie Wang,Guicai Lv,Cheng Wang
Hydrogen production by electrochemical overall water splitting is considered as a clean and renewable approach for greener energy. However, the efficiency of water electrolysis suffers from the sluggish kinetics and high overpotential of OER. Although NiFe LDH is regarded as a promising OER catalyst, it faces the problem of poor conductivity, resulting in the limitations of HER performance. Herein, a hybrid nano-architecture of CoNiN@NiFe LDH as a bifunctional electrocatalyst for overall water splitting is fabricated via in-situ electrochemically assembling hierarchical NiFe LDH nanosheets on the surface of CoNiN. CoNiN@NiFe LDH shows excellent activities for OER with the overpotentials of 227 and 291 mV to deliver the current densities of 10 and 100 mA cm −2 , respectively. Moreover, an alkaline electrolyzer with CoNiN@NiFe LDH as anode and cathode requires a cell voltage of 1.63 V to achieve 10 mA cm −2 . In addition, the excellent stability with 100 h towards overall water splitting outperforms most transition metal-based bifunctional electrocatalysts. The superior performance is attributed to the abundant active sites, the strong electronic interaction, and the corresponding metal (oxy)hydroxides species generated by in situ surface reconstruction and phase transformation.
研究领域:
材料科学
·
电化学
·
能源转换
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Xinyu Chen,Jiexi Song,Yifei Xing,Yanqing Qin,Jianbin Lin,Xiao Qu,Bianjing Sun,Shiyu Du,Diwei Shi,Chuntao Chen,Dongping Sun
Designing transition metal-oxide-based bifunctional electrocatalysts with excellent activity and stability for OER/HER to achieve efficient water splitting is of great importance for renewable energy technologies. Herein, a highly efficient bifunctional catalysts with oxygen-rich vacancies of nickel-decorated RuO 2 (NiRuO 2−x ) prepared by a unique one-pot glucose-blowing approach were investigated. Remarkably, the NiRuO 2−x catalysts exhibited excellent HER and OER activity at 10 mA cm −2 in alkaline solution with only a minimum overpotential of 51 mV and 245 mV, respectively. Furthermore, the NiRuO 2−x overall water splitting exhibited an ultra-low voltage of 1.6 V to obtain 10 mA cm −2 and stability for more than 10 h. XPS measurement and theoretical calculations demonstrated that the introduction of Ni-dopant and oxygen vacancies make the d-band center to lie close to the Fermi energy level, the chemical bonds between the active site and the adsorbed oxygen intermediate state are enhanced, thereby lowering the reaction activation barriers of HER and OER. The assembly of solar-driven alkaline electrolyzers facilitate the application of the NiRuO 2−x bifunctional catalysts.
研究领域:
材料科学
·
可再生能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Energy
·
2022
·
IF 9.257
Kaiyue Chen,Xingkun Wang,Canhui Zhang,Ren Xu,Huanlei Wang,Lei Chu,Minghua Huang
Breakthroughs in the design of robust bifunctional oxygen reduction/evolution reaction (ORR/OER) catalysts could put Zn–air batteries performance to the summit but remain full of challenges. In this work, the MnS phase was deliberately introduced into the Mott–Schottky Co/Co 9 S 8 for engineering a three-phases Co/Co 9 S 8 /MnS heterojunction on defect-rich N-doped mesoporous carbon substrate (Co/Co 9 S 8 /MnS-NMC). It affords abundant three-phases heterostructure interfaces that effectively accelerate the electron transfer and trigger further electronic structure reconfiguration, thus advancing the bifunctional ORR/OER activities. Benefiting from these structures, the Co/Co 9 S 8 /MnS-NMC possesses a half-wave potential of 0.84 V toward ORR and a low overpotential of 330 mV toward OER at a current density of 10 mA/cm 2 , catching up with those of commercial Pt/C and RuO 2 catalysts. It also endows the Zn–air batteries with a good power density, round-trip efficiency, and robust stability over 750 h, showcasing the promising potential in practical applications. This work not only provides a facile strategy to construct the three-phases heterojunction catalysts but also sheds light on developing the efficient and robust nonprecious metal-based bifunctional ORR/OER catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 17
·9419-9426
·
IF 14.511
Jiabiao Yan,Jing Zhu,Dawei Chen,Shuai Liu,Xu Zhang,Shoushan Yu,Zhenhua Zeng,Luhua Jiang,Fanglin Du
Ruthenium-based pyrochlore oxides (A2Ru2O7) have emerged recently as state-of-the-art catalysts for acidic water oxidation; however, their stability still needs to be further improved. Exploring the relationship between the A-site cation and the structure of the active site (Ru) is highly desirable for designing efficient electrocatalysts. Herein, we rationally manipulate the substitution of the A-site atoms in Y2Ru2O7 (YRO) by Ho3+, which has an identical ionic radius to Y3+ but higher electronegativity due to the 4f electron effect. It was demonstrated that the higher electronegativity could enlarge the Ru–O–Ru bond angle and reduce the Ru–O bond length, mitigating the RuO6 octahedral distortion in Ho2Ru2O7 (HRO) for enhancing the intrinsic OER activity. Compared with other pyrochlore oxides, HRO displayed an ultralow overpotential of 215 mV @ 10 mA cm−2 with lower Ru content and higher mass activities, showing long-term (>60 h) stability in acid media. Density functional theory (DFT) calculations revealed that the higher electronegativity of Ho could strengthen the Ru–O covalency, thereby optimizing the free energy of oxygen species (ΔGOOH* − ΔGO2) for better catalytic activity. In addition, the higher electronegativity could reduce the oxygen vacancies and improve the formation energy of oxygen vacancies for better resistance to Ru dissolution. This work reveals the inherent relationship of the A-site atom electronegativity, the lattice structure of the active site, and the activity–stability of the catalysts.
研究领域:
材料科学
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电化学
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催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Rongzhong Yang,Qi Hao,Jianan Zhao,Cong Lei,Shujie Xue,Fadong Miao,Wenbing Tang,Qinghong Huang,Jing Wang,Yuping Wu
The sulfur-doped yttrium ruthenate pyrochlore catalysts was synthesized by simple hydrothermal method and exhibits excellent OER activity and stability under acidic conditions. Remarkably, the Y 2 Ru 2 O 7 S-0.17 catalyst reaches a current density of 10 mA cm −2 with only 237 mV and remains stable during 30 hours of electrolysis. In contrast, the original Y 2 Ru 2 O 7 and commercial RuO 2 require 282 mV and 365 mV, respectively. The introduction of sulfur into the internal lattice, replacing a portion of oxygen ions, creates vacancies that enhance the surface adsorption of oxygen. Furthermore, density functional theory calculations expose that S-doping alters the hybridization between the Ru 4d center and O 2p orbitals, significantly decreasing the energy barrier of the rate-determining step of the OER (O*--OOH*). Consequently, the intrinsic activity of the catalyst is greatly enhanced.
研究领域:
材料科学
·
电化学
·
催化
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Si-Jia Guan,Peng Zhang,Shen-Jing Ji,Yu Cao,Nian-Tzu Suen
It is well known that the “iron” impurity will influence the oxygen evolution reaction (OER) in an alkaline electrolyte, especially for the Ni-based electrocatalyst. Many research studies have investigated the function of Fe in the OER active phase, such as M(OH)2/MOOH (M = Ni and/or Fe), while, surprisingly, very few studies have examined the function of Fe in the “precatalyst” system. Accordingly, in this work, the Ni3–xFexP (x = 0, 0.5, 1) series as an Ni-based precatalyst was employed to inspect the function of internal and external Fe in the Ni-based precatalyst system. It was realized that the sample with internal Fe (i.e., Ni2.5Fe0.5P and Ni2FeP) exhibits efficient OER activity compared to that of the Fe-free one (i.e., Ni3P) owing to the large amount of active M(OH)2/MOOH formed on the surface. This indicates that the internal Fe in the present system may have the ability to facilitate the phase transformation; it was later rationalized from electronic structural calculations that the d band center of the internal Fe (middle transition metal) and Ni (late transition metal) holds the key for this observation. Adding excessive ferrous chloride tetrahydrate (FeCl2·4H2O) as the external Fe in the electrolyte will greatly improve the OER performances for Ni3P; nevertheless, that the OER activity of Ni2FeP is still much superior than that of Ni3P corroborates the fact that the Fe impurity is not the only reason for the elevated OER activity of Ni2FeP and that internal Fe is also critical to the phase transformation as well as OER performance.
研究领域:
电化学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 22
·10433-10440
·
IF 9.931
Yiping Hu,Feng Li,Yu Long,Haidong Yang,Lili Gao,Xuefeng Long,Haiguo Hu,Na Xu,Jun Jin,Jiantai Ma
Searching for highly efficient, stable and non-noble metal electrocatalysts for the hydrogen/oxygen evolution reaction (HER/OER) is crucial to renewable-energy conversion systems. Cobalt phosphosulfide (CoPS) is regarded as a promising electrocatalyst for the HER in acid solution. Nonetheless, there are no studies of its HER and OER activity in basic solution. Herein, we engineer a novel and highly efficient water splitting electrocatalyst of ultrafine CoPS nanoparticles (NPs) encapsulated in N, P, and S tri-doped porous carbon (CoPS@NPS-C) through metal–organic frameworks (MOFs) and commercial carbon black (XC-72) as precursors. The abundant and evenly distributed metals of MOFs form ultrafine CoPS NPs, and the rich N organic ligands of MOFs and XC-72 are shaped into the NPS-C to protect CoPS NPs leading to long-term stability in water-splitting applications. Meanwhile, the strong interaction between CoPS and NPS-C in this special structure not only ensures the high activity of the HER in acid solution and the OER in alkaline solution, but also maintains good HER performance in alkaline solution. The results display that the novel structure electrocatalyst of CoPS@NPS-C has great potential in water-splitting applications.
研究领域:
材料科学
·
电化学
·
可再生能源
·
催化
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2023
·Vol. 6
·期 1
·1-9
·
IF 20.1
Du Peng,Lin Chaoliang,He Xian,Zheng Zhichuan,Xie Xinyu,Huang Kai,Lei Ming,Tang Haolin
Developing relatively cost-effective and high-performance Ru-based composites as electrocatalysts for acidic oxygen evolution has become the critical step toward emerging renewable energy conversion, in which exploring controllable synthetic strategies and investigating the intrinsic nature by non-metallic interfacial modulation is highly desirable. In this work, a facile tandem process is proposed by ball-milling and thermal annealing for the scalable synthesis of Ru–O–Se nanocomposites with in-situ formed crystalline RuSe 2 and metallic Ru heterostructures on a RuO 2 substrate. The optimized RuO x Se y -800 sample has been proved to have an excellent OER activity and long-term stability in an acidic electrolyte due to its suitable microscopic morphology and phase composition, along with a relatively smaller Tafel slope of 45.4 mV dec −1 compared with commercial RuO 2 and most similar catalysts reported in the literature. The outstanding acidic OER performance can be ascribed to the enhanced electron transfer and more active site exposure by controllable selenization. This work paves a novel way for the design and large-scale production of various non-metallic modified composite catalysts for extensive applications of energy conversion and storage.
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
Small Structures
·
2022
·Vol. 3
·期 4
·2100211
·
IF 11.343
Fan Tang,Sijie Guo,Yonggang Sun,Xijie Lin,Jianhua Qiu,Anmin Cao
Developing high-performance, low-cost, and robust electrocatalysts is of great importance to boost the efficiency of oxygen evolution reaction (OER). Herein, based on the integrated design of chemical composition and geometric structure, Fe-doped CoO nanotubes (NTs) with high OER activity are prepared by a facile template-free approach. The construction of this tubular structure is realized via a simple wet-chemical reaction to prepare solid nanorods as precursor and a subsequent calcination treatment of the precursor to form hollow cavity. The favorable composition and unique hollow structure endow these Fe-doped CoO NTs with remarkable activity toward OER. When used as the electrocatalyst for OER, the Fe-doped CoO NTs show a small overpotential of 282 mV at the current density of 10 mA cm −2 , a low Tafel slope of 78.26 mV dec −1 , and a high turnover frequency of 0.0965 s −1 at the overpotential of 282 mV, which is superior to those of CoO NTs and solid CoO nanoparticles. Moreover, the Fe-doped CoO NTs also exhibit excellent long-term stability of 24 h at the current density of 10 mA cm −2 .
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Catalysis
·
2024
·
IF 11.3
Zhigao Xue,Biao Wu,Zheng Zhang,Chao Lin,Xiaopeng Li,Qiuju Zhang,Kai Tao
Creating highly effective electrocatalysts for the oxygen evolution reaction (OER) holds paramount importance in advancing carbon-neutral hydrogen production through water electrolysis. Recent research highlights the crucial role of spin effects on the OER, emphasizing that the manipulation of spin polarization is a promising strategy to augment the OER kinetics. Here, we present a core–shell heterostructure electrocatalyst, which leverages the strong coupling of the interface between antiferromagnetic Co3O4 and NiFe-layered double hydroxide (NiFe-LDH) to trigger a spontaneous magnetic response enhancement, which suggests the strong double exchange interaction at the interface of the core–shell heterostructure. This electrocatalyst displays a 26-fold increase in intrinsic OER activity compared to pristine NiFe-LDH at an overpotential of 0.25 V. Through experimental and computational analyses, we find that the strong double exchange interaction within the heterostructure creates polarized spin conduction channels at the interface, which enables efficient accumulation of electrons with appropriate spin states, thereby lowering the energy barrier for the generation of triplet O2. Our work presents a promising approach to designing high-performance OER catalysts by introducing spin selectivity in traditional metal oxide electrocatalysts.
研究领域:
电化学
·
材料科学
·
催化
·
自旋电子学
✓ 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）