Journal ArticleDOI
Strong Surface Hydrophilicity in Co-Based Electrocatalysts for Water Oxidation
Fumin Tang,Weiren Cheng,Yuanyuan Huang,Hui Su,Tao Yao,Qinghua Liu,Jinkun Liu,Fengchun Hu,Yong Jiang,Zhihu Sun,Shiqiang Wei +10 more
TLDR
X-ray absorption spectroscopy and first-principles calculations demonstrate that the strong interface electron coupling between CoOOH and graphene extracts partial electrons from the active sties and increases the electron state density around the Fermi level and effectively promotes the surface intermediates formation for efficient OER.Abstract:
Developing efficient and durable oxygen evolution electrocatalyst is of paramount importance for the large-scale supply of renewable energy sources. Herein, we report the design of significant surface hydrophilicity based on cobalt oxyhydroxide (CoOOH) nanosheets to greatly improve the surface hydroxyl species adsorption and reaction kinetics at the Helmholtz double layer for high-efficiency water oxidation activity. The as-designed CoOOH-graphene nanosheets achieve a small surface water contact angle of ∼23° and a large double-layer capacitance (Cdl) of 8.44 mF/cm2 and thus could evidently strengthen surface species adsorption and trigger electrochemical oxygen evolution reaction (OER) under a quite low onset potential of 200 mV with an excellent Tafel slope of 32 mV/dec. X-ray absorption spectroscopy and first-principles calculations demonstrate that the strong interface electron coupling between CoOOH and graphene extracts partial electrons from the active sties and increases the electron state density...read more
Citations
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Journal ArticleDOI
Defect‐Rich Nitrogen Doped Co3O4/C Porous Nanocubes Enable High‐Efficiency Bifunctional Oxygen Electrocatalysis
Zhichao Wang,Wenjia Xu,Xiaokang Chen,Yanhua Peng,Yanyan Song,Chunxiao Lv,Hongli Liu,Junwei Sun,Ding Yuan,Xiyan Li,Xiangxin Guo,Dongjiang Yang,Lixue Zhang +12 more
Journal ArticleDOI
Non‐3d Metal Modulation of a Cobalt Imidazolate Framework for Excellent Electrocatalytic Oxygen Evolution in Neutral Media
Yan-Tong Xu,Zi-Ming Ye,Jia-Wen Ye,Li-Ming Cao,Li-Ming Cao,Rui-Kang Huang,Jun-Xi Wu,Dong-Dong Zhou,Xue-Feng Zhang,Chun-Ting He,Chun-Ting He,Jie-Peng Zhang,Xiao-Ming Chen +12 more
TL;DR: Spectroscopic measurements and computational simulations revealed that the non-3d metals modulate the electronic structure of Co for optimum reactant/product adsorption and tailor the energy of rate-determining step to a more moderate value.
Journal ArticleDOI
Laser synthesis of oxygen vacancy-modified CoOOH for highly efficient oxygen evolution.
TL;DR: Results demonstrate that oxygen vacancies can optimize the absorption of oxygen evolution reaction (OER) intermediates and improve electrical conductivity; meanwhile, the relatively thin thickness can provide more active sites, thus leading to excellent OER activity of oxygen vacancy-modified CoOOH nanosheets.
Journal ArticleDOI
Operando Revealing Dynamic Reconstruction of NiCo Carbonate Hydroxide for High-Rate Energy Storage
Shaofeng Li,Shaofeng Li,Yan Zhang,Yan Zhang,Nanshu Liu,Chang Yu,Sang Jun Lee,Si Zhou,Rong Fu,Juan Yang,Wei Guo,Hai Huang,Jun-Sik Lee,Chenxu Wang,Taeho Roy Kim,Dennis Nordlund,Piero Pianetta,Xi-Wen Du,Jijun Zhao,Yijin Liu,Jieshan Qiu,Jieshan Qiu +21 more
TL;DR: In this paper, the authors reveal that the irreversible redox of transition metal carbonate hydroxide (CH) at early stage of cyclic voltammetry (CV) cycling induces a phase transition in the NiCo CH nanowires forming oxygen vacancies-enriched NiCo layered double hydride (LDH) nanosheets with superior high-rate energy storage ability.
Journal ArticleDOI
Hetero-N-Coordinated Co Single Sites with High Turnover Frequency for Efficient Electrocatalytic Oxygen Evolution in an Acidic Medium
Hui Su,Xu Zhao,Weiren Cheng,Hui Zhang,Yuanli Li,Yuanli Li,Wanlin Zhou,Meihuan Liu,Qinghua Liu +8 more
TL;DR: The development of noble-metal-free, acid-compatible oxygen electrocatalysts and monitoring their active sites' evolution under working conditions are crucial for global renewable energy storage as discussed by the authors.
References
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Journal ArticleDOI
The rise of graphene
TL;DR: Owing to its unusual electronic spectrum, graphene has led to the emergence of a new paradigm of 'relativistic' condensed-matter physics, where quantum relativistic phenomena can now be mimicked and tested in table-top experiments.
Journal ArticleDOI
Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction
TL;DR: The Co₃O₄/N-doped graphene hybrid exhibits similar catalytic activity but superior stability to Pt in alkaline solutions, making it a high-performance non-precious metal-based bi-catalyst for both ORR and OER.
Journal ArticleDOI
Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction
TL;DR: In this paper, the authors report a protocol for evaluating the activity, stability, and Faradaic efficiency of electrodeposited oxygen-evolving electrocatalysts for water oxidation.
Journal ArticleDOI
A perovskite oxide optimized for oxygen evolution catalysis from molecular orbital principles.
TL;DR: The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an eg symmetry of surface transition metal cations in an oxide.
Journal ArticleDOI
Graphene, related two-dimensional crystals, and hybrid systems for energy conversion and storage
Francesco Bonaccorso,Francesco Bonaccorso,Luigi Colombo,Guihua Yu,Meryl D. Stoller,Valentina Tozzini,Andrea C. Ferrari,Rodney S. Ruoff,Vittorio Pellegrini +8 more
TL;DR: Graphene and related two-dimensional crystals and hybrid systems showcase several key properties that can address emerging energy needs, in particular for the ever growing market of portable and wearable energy conversion and storage devices.
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