Maximizing the utility of single atom electrocatalysts on a 3D graphene nanomesh

2019 ◽  
Vol 7 (26) ◽  
pp. 15575-15579 ◽  
Author(s):  
Kai Chi ◽  
Zhongxin Chen ◽  
Fei Xiao ◽  
Wei Guo ◽  
Wei Xi ◽  
...  

Vertically aligned N-doped graphene nanomesh arrays (VNGNMAs) with a high density of in-plane surface holes and out-of-plane interconnected, vertically aligned structures as a scaffold can facilitate the diffusion of reactants and maximize the utility of single atoms in the liquid phase.

2020 ◽  
Vol 8 (37) ◽  
pp. 19319-19327 ◽  
Author(s):  
Lei Li ◽  
Rao Huang ◽  
Xinrui Cao ◽  
Yuhua Wen

Transition metal single atoms anchored on nitrogen-doped graphene toward the oxygen reduction reaction have been screened.


2020 ◽  
Vol 7 (10) ◽  
pp. 2726-2733
Author(s):  
Chao Lin ◽  
Hao Zhang ◽  
Xiaokai Song ◽  
Dong-Hyung Kim ◽  
Xiaopeng Li ◽  
...  

A synthetic strategy utilizing a predesigned organic framework is demonstrated to construct high-density single-atom catalysts for long-lasting zinc–air flow batteries.


2020 ◽  
Author(s):  
Weihong Lai ◽  
Heng Wang ◽  
Quan jiang ◽  
Zichao Yan ◽  
Hanwen Liu ◽  
...  

<p>Herein, we develop a non-selective charge compensation strategy to prepare multi-single-atom doped carbon (MSAC) in which a sodium p-toluenesulfonate (PTS-Na) doped polypyrrole (S-PPy) polymer is designed to anchor discretionary mixtures of multiple metal cations, including iron (Fe<sup>3+</sup>), cobalt (Co<sup>3+</sup>), ruthenium (Ru<sup>3+</sup>), palladium (Pd<sup>2+</sup>), indium (In<sup>3+</sup>), iridium (Ir<sup>2+</sup>), and platinum (Pt<sup>2+</sup>) . As illustrated in Figure 1, the carbon surface can be tuned with different level of compositional complexities, including unary Pt<sub>1</sub>@NC, binary (MSAC-2, (PtFe)<sub>1</sub>@NC), ternary (MSAC-3, (PtFeIr)<sub>1</sub>@NC), quaternary (MSAC-4, (PtFeIrRu)<sub>1</sub>@NC), quinary (MSAC-5, (PtFeIrRuCo)<sub>1</sub>@NC), senary (MSAC-6, (PtFeIrRuCoPd)<sub>1</sub>@NC), and septenary (MSAC-7, (PtFeIrRuCoPdIn)<sub>1</sub>@NC) samples. The structural evolution of carbon surface dictates the activities of both ORR and HER. The senary MSAC-6 achieves the ORR mass activity of 18.1 A·mg<sub>metal</sub><sup>-1</sup> at 0.9 V (Vs reversible hydrogen electrode (RHE)) over 30K cycles, which is 164 times higher than that of commercial Pt/C. The quaternary MSAC-4 presented a comparable HER catalytic capability with that of Pt/C. These results indicate that the highly complexed carbon surface can enhance its ability over general electrochemical catalytic reactions. The mechanisms regarding of the ORR and HER activities of the alternated carbon surface are also theoretically and experimentally investigated in this work, showing that the synergistic effects amongst the co-doped atoms can activate or inactivate certain single-atom sites.</p>


2021 ◽  
Vol 536 ◽  
pp. 147809
Author(s):  
Mingming Luo ◽  
Zhao Liang ◽  
Chao Liu ◽  
Xiaopeng Qi ◽  
Mingwei Chen ◽  
...  

Author(s):  
Xu Han ◽  
Zeyun Zhang ◽  
Xuefei Xu

To suppress the shuttle effect of lithium polysulfides and promote fast kinetics of charge−discharge process in Li−S batteries, it is essential to search promising catalysts with sufficient stability and high...


Author(s):  
Jiazhe Li ◽  
Zhiyuan Yan ◽  
Lingxiang Bao ◽  
Cheng-Hui Sun ◽  
Si-Ping Pang

Pt species with different sizes uniformly dispersed on phosphotungstic (PTA) acid modified carbon matrix (PTA-C) were controllably synthesized by manipulating the coordination environment. The results indicate that high-density and well-defined...


ACS Catalysis ◽  
2021 ◽  
pp. 7863-7875
Author(s):  
Julia Büker ◽  
Xiubing Huang ◽  
Johannes Bitzer ◽  
Wolfgang Kleist ◽  
Martin Muhler ◽  
...  

Author(s):  
Jingwen Pan ◽  
Baoyu Gao ◽  
Pijun Duan ◽  
Kangying Guo ◽  
Muhammad Akram ◽  
...  

Nonradical pathway-based persulfate oxidation technology is considered to be a promising method for high-salinity organic wastewater treatment.


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