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Dual‐atom catalysts exhibit higher reactivity and selectivity than the single‐atom catalysts. The pyrolysis of bimetal salt precursors is the most typical method for synthesizing dual‐atomic catalysts; however, the finiteness of bimetal salts limits the variety of dual‐atomic catalysts. In this study, a confined synthesis strategy for synthesizing dual‐atomic catalysts is developed. Owing to the in...
It is challenging yet promising to design highly accessible N‐doped carbon skeletons to fully expose the active sites inside single‐atom catalysts. Herein, mesoporous N‐doped carbon hollow spheres with regulatable through‐pore size can be formulated by a simple sequential synthesis procedure, in which the condensed SiO2 is acted as removable dual‐templates to produce both hollow interiors and through‐pores,...
2D metallene possess high surface area and excellent electron transport capability, thus enabling efficient application in oxygen reduction reaction (ORR). However, the interface regulation and electronic structure optimization of metallene are still great challenges. Herein, Pd–B/Pd hetero‐metallene is constructed by interface engineering and B modification strategies for efficient electrocatalytic...
The development of atomically dispersed iron‐nitrogen‐carbon (Fe─N─C) catalysts as an alternative to precious platinum holds great potential for the substantial progress of a variety of oxygen reduction reaction (ORR)‐associated energy conversion technologies. Nevertheless, the precise synthesis of Fe─N─C single atomic catalysts (SACs) with a high density of accessible active sites and pronounced...
Pyridinic nitrogen has been recognized as the primary active site in nitrogen‐doped carbon electrocatalysts for the oxygen reduction reaction (ORR), which is a critical process in many renewable energy devices. However, the preparation of nitrogen‐doped carbon catalysts comprised of exclusively pyridinic nitrogen remains challenging, as well as understanding the precise ORR mechanisms on the catalyst...
The systematical understanding of metal‐dependent activity in electrocatalyzing oxygen reduction reaction (ORR), a vital reaction with sluggish kinetics for zinc‐air batteries, remains quite unclear. An atomic and spatial engineering modulating ORR activity over hollow carbon quasi‐sphere (HCS) confined in a series of single M‐N (M = Cu, Mn, Ni) sites is reported here. Based on the theoretical prediction...
Transition metal–nitrogen–carbon (TM–N–C) catalysts have been intensely investigated to tackle the sluggish oxygen reduction reactions (ORRs), but insufficient accessibility of the active sites limits their performance. Here, by using solid ZIF‐L nanorods as self‐sacrifice templates, a ZIF‐phase‐transition strategy is developed to fabricate ZIF‐8 hollow nanorods with open cavities, which can be subsequently...
Exploring highly active and cost‐efficient single‐atom catalysts (SACs) for oxygen reduction reaction (ORR) is critical for the large‐scale application of Zn–air battery. Herein, density functional theory (DFT) calculations predict that the intrinsic ORR activity of the active metal of SACs follows the trend of Co > Fe > Ni ≈ Cu, in which Co SACs possess the best ORR activity due to its optimized...
The development of low‐Pt catalysts with high activity and durability is critical for fuel cells. Here, Pt‐skin wrapped sub‐5 nm PtCo intermetallic nanoparticles are successfully mounted on single atom Co‐N‐C support by exploiting the barrier effect of Co‐anchor. According to a collaborative experimental and computational investigation, the increased oxygen reduction reaction activity of PtCo/Co‐N‐C...
Single atom sites (SAS) of FeN4 are clarified as one of the most active components for the oxygen reduction reaction (ORR). Effective strategies by engineering the local coordination environment and site density of FeN4 sites are crucial to further enhance the electrocatalytic ORR performance. Herein, the integration of a second metal of Mn with Fe to construct Fe&Mn/N‐C catalysts with enhanced...
Platinum (Pt), as a commonly used electrocatalyst in direct methanol fuel cells (DMFCs), suffers from sluggish kinetics of both the methanol oxidation reaction (MOR) and oxygen reduction reaction (ORR). Geometric engineering has been proven effective for improving the MOR and ORR activities. Thus, by modulating the Pt precursor and poly(vinylpyrrolidone) (PVP) dosages, different porous PtCu nanotubes...
Carbon‐based single‐atom catalysts (CSACs) have recently received extensive attention in catalysis research. However, the preparation process of CSACs involves a high‐temperature treatment, during which metal atoms are mobile and aggregated into nanoparticles, detrimental to the catalytic performance. Herein, an ion‐imprinting derived strategy is proposed to synthesize CSACs, in which isolated metal–nitrogen–carbon...
In article number 2006178, Baitao Li, Xiujun Wang, and co‐workers report a class of petal‐like Fe‐NC catalysts with an ultrathin porous nanosheet structure and proper hydrophilicity/hydrophobicity. This structure improves the exposure of inaccessible Fe‐N4 active sites and enhances oxygen diffusion, ensuring fast mass transport for oxygen reduction reaction. This article presents a unique perspective...
Nitrogen‐coordinated single‐atom catalysts (SACs) have emerged as a new frontier for accelerating oxygen reduction reaction (ORR) owing to the optimal atom efficiency and fascinating properties. However, augmenting the full exposure of active sites is a crucial challenge in terms of simultaneously pursuing high metal loading of SACs. Here, petal‐like porous carbon nanosheets with densely accessible...
Pd‐ and Pd‐based catalysts have emerged as potential alternatives to Pt‐ and Pt‐based catalysts for numerous electrocatalytic reactions, particularly fuel cell‐related reactions, including the anodic fuel oxidation reaction (FOR) and cathodic oxygen reduction reaction (ORR). The creation of Pd‐ and Pd‐based architectures with large surface areas, numerous low‐coordinated atoms, and high density of...
The construction of multi‐heteroatom‐doped metal‐free carbon with a reversibly oxygen‐involving electrocatalytic performance is highly desirable for rechargeable metal‐air batteries. However, the conventional approach for doping heteroatoms into the carbon matrix remains a huge challenge owing to multistep postdoping procedures. Here, a self‐templated carbonization strategy to prepare a nitrogen,...
In article number 1804855, Xingmei Guo, Tongxiang Fan, and co‐workers synthesize biomorphic CoJNJC/CoOx composite with micro‐ellipsoidal structure by using natural chloroplasts containing big amounts of chlorophylls both as template and porphyrin source. The unique synergistic effect between CoJNJC and CoOx, together with efficient bio‐architecture, leads to excellent electrocatalytical performance...
Natural chloroplasts containing big amounts of chlorophylls (magnesium porphyrin, Mg‐Chl) are employed both as template and porphyrin source to synthesize biomorphic CoNC/CoOx composite as electrocatalyst for the oxygen reduction reaction (ORR). Cobalt‐substituted chlorophyll derivative (Co‐Chl) in chloroplasts is first obtained by successively rinsing in hydrochloric acid and cobalt acetate solutions...
Herein, a type of Fe, N‐codoped carbon electrocatalyst (FeNx/C, Fe‐N‐BCNT#BP) containing bamboo carbon nanotubes and displaying bifunctional high catalytic efficiency for both oxygen reduction reaction (ORR) and carbon dioxide reduction reaction (CO2RR) is reported. It shows high electrocatalytic activity and stability for both the ORR process with onset potential of 1.03 VRHE in alkaline and the...
It is an ongoing challenge to fabricate nonprecious oxygen reduction reaction (ORR) catalysts that can be comparable to or exceed the efficiency of platinum. A highly active non‐platinum self‐supporting Fe−N/C catalyst has been developed through the pyrolysis of a new type of precursor of iron coordination complex, in which 1,4‐bis(1H‐1,3,7,8–tetraazacyclopenta(1)phenanthren‐2‐yl)benzene (btcpb) functions...
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