Article
Chemistry, Physical
Liang Yan, Bing Zhang
Summary: Developing efficient and stable non-noble metal oxygen evolution reaction (OER) electrocatalysts for sustainable water-splitting is challenging. The self-supporting Co3O4-CoOOH/CP showed excellent OER activity and stability, providing opportunities for future high-performance electrocatalysts.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Huiyan Zeng, M'hamed Oubla, Xuepeng Zhong, Nicolas Alonso-Vante, Fei Du, Yu Xie, Yunhui Huang, Jiwei Ma
Summary: By introducing oxygen vacancies and fluorine anions, the catalytic activity for oxygen evolution reaction (OER) was enhanced. Theoretical calculations were consistent with experimental results, providing a pathway for designing new defective fluorinated oxides.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Energy & Fuels
Guoru Li, Xiaoting Yu, Fengxiang Yin, Zhiping Lei, Xinran Zhao, Xiaobo He, Zhichun Li
Summary: By doping Te into spinel Co3O4 catalysts, this study successfully reduced the overpotential of the oxygen evolution reaction and increased the efficiency of water splitting. The lattice distortion caused by Te doping resulted in smaller Te-Co3O4 particles with larger surface area for better accessibility of active sites, while the introduction of oxygen vacancies modified the electronic structure and improved the density of active sites. The overall effects contributed to enhanced reaction kinetics and minimized overpotentials in high-performance electrocatalysis.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Physical
Jiehai Peng, Yuan Yuan, Wuhua Yuan, Kun Peng
Summary: In this study, urchin-like Co3O4 microspheres were synthesized and oxygen vacancies and phosphorus doping were introduced to adjust the electronic structure, increasing catalytic activity, improving adsorption energy of intermediates, and activating more active sites for the catalytic reaction. Additionally, Co3O4-Ov and Co3O4-P catalysts demonstrated excellent performance in OER and HER, with an electrolytic cell only needing 1.58 V to achieve 20 mA cm-2 for overall water splitting.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Tang Tang, Zhe Jiang, Jun Deng, Shuai Niu, Ze-Cheng Yao, Wen-Jie Jiang, Lin-Juan Zhang, Jin-Song Hu
Summary: Alkaline electrochemical water oxidation powered by renewable energies is a promising and environmentally friendly method to produce hydrogen. By introducing Fe3+, a hierarchical FeCo LDH@Co3O4 electrode with enhanced electrochemical performance for water oxidation is fabricated.
Article
Chemistry, Physical
Yonghao Gan, Meilin Cui, Xiaoping Dai, Ying Ye, Fei Nie, Ziteng Ren, Xueli Yin, Baoqiang Wu, Yihua Cao, Run Cai, Xin Zhang
Summary: Large-scale electrolysis of water for high-purity hydrogen production is an effective solution to the energy crisis and environmental pollution. However, the lack of efficient, cheap, and stable catalysts hinders its industrial application. In this study, Mn-doped nickel ferrite nanosheets were synthesized using a simple hydrothermal process, displaying excellent electrocatalytic activity for the oxygen evolution reaction. The unique structure of the nanosheets and the effects of Mn doping contribute to the enhanced performance.
Article
Energy & Fuels
Guang-Yi Chen, Shao-Li Zhu, Xiao-Qiang Han, De-Cheng Wang, Jian-Cheng Zhang, Xiang-Dong Huai, Xiang Li, Fei-Yue Zhang, Zhe Xiang, Wen-Zhuo Zhang
Summary: In this paper, Co3O4 nanosheet arrays with cationic vacancies at octahedral sites (V (x) -Co3O4) were synthesized using a facile three-step reaction process. DFT computational results further revealed that the cationic vacancies can increase electron density per Co atom, optimizing the adsorption energy of intermediate products. The optimized V(0.3)-Co3O4/CC electrode with abundant cationic vacancies exhibited excellent OER performance in alkaline electrolytes, surpassing that of pure Co3O4 and commercial IrO2.
Article
Chemistry, Physical
Jiawei Guo, Zhuojun Wei, Kun Wang, Hui Zhang
Summary: CoFe-LDH nanosheet arrays with excellent electrocatalytic performance were synthesized via citric acid-assisted aqueous phase coprecipitation on rGO-modified Ni foam, showing promising applications for oxygen and hydrogen evolution reactions, as well as overall water splitting.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Lekai Zheng, Lina Hu, Yongchuan Hu, Fang Liu, Zhiming Liu, Yanming Xue, Jun Zhang, Hui Liu, Chengchun Tang
Summary: This study successfully developed a high efficiency and stable OER catalyst by constructing novel self-supported alpha-Co(OH)(2) coated Co3O4 nanosheet arrays. The optimized heterostructure with a suitable proportion of alpha-Co(OH)(2) to Co3O4 demonstrated excellent OER performance due to the optimized electronic structure and increased active sites.
CATALYSIS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Ruyi Zhong, Qi Wang, Lei Du, Yayun Pu, Siyu Ye, Meng Gu, Z. Conrad Zhang, Limin Huang
Summary: Surfactant-free, freestanding, and hierarchical two-dimensional polycrystalline cobalt oxide nanosheets with enriched oxygen vacancies (Co3O4-VO) were synthesized. These Co3O4-VO nanosheets outperformed the original nanosheets and conventionally calcined Co3O4 in electrochemical oxygen evolution and HMF oxidation to FDCA due to their preserved 2D structure and elimination of surfactant, exposing abundant active sites. The strain-induced oxygen vacancies at grain boundaries of Co3O4 nanocrystallines were also proposed to contribute to the improved electrooxidation performance. Furthermore, Co3O4-VO showed remarkable long-term stability in 1 M KOH chronoamperometric test.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Environmental
Hefeng Yuan, Shumin Wang, Zizai Ma, Manab Kundu, Bin Tang, Jinping Li, Xiaoguang Wang
Summary: The development of earth abundant electrocatalysts is crucial for large-scale hydrogen production. This study introduces a self-supported VOB-Co3O4/NF nanowire array catalyst with trifunctional capabilities, exhibiting excellent stability, durability, and high current density for hydrogen and oxygen production reactions in alkaline media. Engineered boron and oxygen defects in the Co3O4 nanowires effectively modulate their electronic structure to enhance electrical conductivity and create numerous electroactive sites.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Dukhyun Nam, Geunhyeong Lee, Jooheon Kim
Summary: In this study, a novel Fe-doped nickel phosphide material with phosphorus vacancies (Fe-Ni2P (P-V)) was synthesized using an easy NaBH4 reduction strategy. The Fe-Ni2P (P-V) showed outstanding oxygen evolution reaction (OER) performance, including lower overpotential, smaller Tafel slope, and excellent durability.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
Yu Lu, Chaojiang Li, Yong Zhang, Xun Cao, Gang Xie, Meiling Wang, Dongdong Peng, Kang Huang, Bowei Zhang, Tian Wang, Wu Junsheng, Yizhong Huang
Summary: This study developed a novel method to create both Co and O vacancies in synthetic Co3O4 nanosheets, making the oxidation reaction and OER more reliable and controllable. Additionally, DFT calculations showed that multiple vacancies could create trap states in the bandgap of Co3O4, promoting adsorption capability and water splitting.
Article
Materials Science, Multidisciplinary
Baoli Wang, Shuchang Luo, Yijing Ai, Yucen Yao, Siyue Zhang, Yuhao Huang, Xiaoping Zhang, Wei Sun
Summary: In this study, a hollow Co3O4 nanocapsules/N-doped carbon composite was successfully synthesized by combining a carbonization process and an oxidation route using biomass as a carbon source. The obtained composite exhibited a porous hierarchical structure, with hollow Co3O4 nanocapsules uniformly dispersed and anchored on the carbon carrier. Electrochemical measurements revealed that the resulting Co3O4/NC exhibited excellent catalytic performance towards OER, with a low overpotential of only 328 mV to achieve a current density of 10 mA cm(-2) and a Tafel slope of 84 mV dec(-1), surpassing the benchmark catalyst RuO2. The outstanding catalytic activity can be attributed to the unique hollow nanocapsules structure and abundant oxygen deficiency, providing a large number of catalytic active sites. This study provides valuable insights for the design of high-efficiency biomass-derived catalysts in the field of OER.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Energy & Fuels
Chao Wang, Guozhe Sui, Dongxuan Guo, Jinlong Li, Yan Zhuang, Wenxin Guo, Yu Zhou, Xiuna Yang, Dong-Feng Chai
Summary: A new method has been developed to enhance the electrochemical properties of NiCo2O4 and Co3O4. In this method, silicon dioxide is used as a sacrificial shell, and ordered mesoporous microspheres with increased specific surface area and oxygen vacancies are constructed through self-activation and partial reduction. The improved materials exhibit good specific capacitance and catalytic activity for the hydrogen evolution reaction.
JOURNAL OF ENERGY STORAGE
(2022)
