scholarly journals Conformation-modulated three-dimensional electrocatalysts for high-performance fuel cell electrodes

2021 ◽  
Vol 7 (30) ◽  
pp. eabe9083
Author(s):  
Jong Min Kim ◽  
Ahrae Jo ◽  
Kyung Ah Lee ◽  
Hyeuk Jin Han ◽  
Ye Ji Kim ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Fuel Cells ◽  
Surface Area ◽  
Active Sites ◽  
High Performance ◽  
Polymer Electrolyte Membrane ◽  
Three Dimensional ◽  
Building Blocks ◽  
High Mass ◽  
Transfer Resistance

Unsupported Pt electrocatalysts demonstrate excellent electrochemical stability when used in polymer electrolyte membrane fuel cells; however, their extreme thinness and low porosity result in insufficient surface area and high mass transfer resistance. Here, we introduce three-dimensionally (3D) customized, multiscale Pt nanoarchitectures (PtNAs) composed of dense and narrow (for sufficient active sites) and sparse (for improved mass transfer) nanoscale building blocks. The 3D-multiscale PtNA fabricated by ultrahigh-resolution nanotransfer printing exhibited excellent performance (45% enhanced maximum power density) and high durability (only 5% loss of surface area for 5000 cycles) compared to commercial Pt/C. We also theoretically elucidate the relationship between the 3D structures and cell performance using computational fluid dynamics. We expect that the structure-controlled 3D electrocatalysts will introduce a new pathway to design and fabricate high-performance electrocatalysts for fuel cells, as well as various electrochemical devices that require the precision engineering of reaction surfaces and mass transfer.

scholarly journals Direct coherent multi-ink printing of fabric supercapacitors

2021 ◽  
Vol 7 (3) ◽  
pp. eabd6978 ◽  
Author(s):  
Jingxin Zhao ◽  
Hongyu Lu ◽  
Yan Zhang ◽  
Shixiong Yu ◽  
Oleksandr I. Malyi ◽  
...  
Keyword(s):  
System Integration ◽  
High Performance ◽  
Mechanical Stability ◽  
Three Dimensional ◽  
High Mass ◽  
Wearable Electronics ◽  
Energy Storage Devices ◽  
Fabrication Procedure ◽  
Self Powered ◽  
Mechanical Devices

Coaxial fiber-shaped supercapacitors with short charge carrier diffusion paths are highly desirable as high-performance energy storage devices for wearable electronics. However, the traditional approaches based on the multistep fabrication processes for constructing the fiber-shaped energy device still encounter persistent restrictions in fabrication procedure, scalability, and mechanical durability. To overcome this critical challenge, an all-in-one coaxial fiber-shaped asymmetric supercapacitor (FASC) device is realized by a direct coherent multi-ink writing three-dimensional printing technology via designing the internal structure of the coaxial needles and regulating the rheological property and the feed rates of the multi-ink. Benefitting from the compact coaxial structure, the FASC device delivers a superior areal energy/power density at a high mass loading, and outstanding mechanical stability. As a conceptual exhibition for system integration, the FASC device is integrated with mechanical units and pressure sensor to realize high-performance self-powered mechanical devices and monitoring systems, respectively.

Accelerating ion diffusion with unique three-dimensionally interconnected nanopores for self-membrane high-performance pseudocapacitors

Nanoscale ◽  
2017 ◽  
Vol 9 (46) ◽  
pp. 18311-18317 ◽  
Author(s):  
Yuan Gao ◽  
Yuanjing Lin ◽  
Zehua Peng ◽  
Qingfeng Zhou ◽  
Zhiyong Fan
Keyword(s):  
Aspect Ratio ◽  
Surface Area ◽  
Structural Stability ◽  
High Aspect Ratio ◽  
High Performance ◽  
Three Dimensional ◽  
Rate Capability ◽  
Large Surface Area ◽  
Nanoporous Structure ◽  
Ion Diffusion

Three-dimensional interconnected nanoporous structure (3-D INPOS) possesses high aspect ratio, large surface area, as well as good structural stability. Profiting from its unique interconnected architecture, the 3-D INPOS pseudocapacitor achieves a largely enhanced capacitance and rate capability.

Macroporous and Monolithic Anode Based on Polyaniline Hybridized Three-Dimensional Graphene for High-Performance Microbial Fuel Cells

ACS Nano ◽  
2012 ◽  
Vol 6 (3) ◽  
pp. 2394-2400 ◽  
Author(s):  
Yang-Chun Yong ◽  
Xiao-Chen Dong ◽  
Mary B. Chan-Park ◽  
Hao Song ◽  
Peng Chen
Keyword(s):  
Fuel Cells ◽  
Microbial Fuel Cells ◽  
High Performance ◽  
Three Dimensional

Three-dimensional graphene encapsulated hollow CoSe2-SnSe2 nanoboxes for high performance asymmetric supercapacitors

2022 ◽  
Author(s):  
Kainan Li ◽  
Ke Zheng ◽  
Zhifang Zhang ◽  
Kuan Li ◽  
Ziyao Bian ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Active Sites ◽  
Specific Capacity ◽  
Three Dimensional ◽  
Hollow Structure ◽  
Large Specific Surface Area ◽  
Composite Aerogel

Abstract Construction of metal selenides with a large specific surface area and a hollow structure is one of the effective methods to improve the electrochemical performance of supercapacitors. However, the nano-material easily agglomerates due to the lack of support, resulting in the loss of electrochemical performance. Herein, we successfully design a three-dimensional graphene (3DG) encapsulation-protected hollow nanoboxes (CoSe2-SnSe2) composite aerogel (3DG/CoSe2-SnSe2) via a co-precipitation method coupled with self-assembly route, followed by a high temperature selenidation strategy. The obtained aerogel possesses porous 3DG conductive network, large specific surface area and plenty of reactive active sites. It could be used as a flexible and binder-free electrode after a facile mechanical compression process, which provided a high specific capacitance of 460 F g-1 at 0.5 A g-1, good rate capability of 212.7 F g-1 at 10 A g-1, and excellent cycle stability due to the fast electron/ion transfer and electrolyte diffusion. With the as-prepared 3DG/CoSe2-SnSe2 as positive electrodes and the AC (activated carbon) as negative electrodes, an asymmetric supercapacitor (3DG/CoSe2-SnSe2//AC) was fabricated, which delivered a high specific capacity of 38 F g-1 at 1A g-1 and an energy density of 11.89 W h kg-1 at 749.9 W kg-1, as well as a capacitance retention of 91.1% after 3000 cycles. This work provides a new method for preparing electrode material.

scholarly journals High performance electrocatalysts supported on graphene based hybrids for polymer electrolyte membrane fuel cells

2018 ◽  
Vol 43 (52) ◽  
pp. 23221-23230 ◽  
Author(s):  
Begüm Yarar Kaplan ◽  
Navid Haghmoradi ◽  
Emre Biçer ◽  
César Merino ◽  
Selmiye Alkan Gürsel
Keyword(s):  
Fuel Cells ◽  
Polymer Electrolyte ◽  
High Performance ◽  
Polymer Electrolyte Membrane ◽  
Electrolyte Membrane

Geometric pore surface area and fractal dimension of catalyzed electrodes in polymer electrolyte membrane fuel cells

2018 ◽  
Vol 43 (7) ◽  
pp. 3011-3019 ◽  
Author(s):  
Jian Zhao ◽  
Samaneh Shahgaldi ◽  
Adnan Ozden ◽  
Ibrahim E. Alaefour ◽  
Xianguo Li ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Fuel Cells ◽  
Polymer Electrolyte ◽  
Surface Area ◽  
Polymer Electrolyte Membrane ◽  
Pore Surface ◽  
Electrolyte Membrane ◽  
Pore Surface Area

scholarly journals Three-dimensional porous carbon nanotube sponges for high-performance anodes of microbial fuel cells

2015 ◽  
Vol 298 ◽  
pp. 177-183 ◽  
Author(s):  
Celal Erbay ◽  
Gang Yang ◽  
Paul de Figueiredo ◽  
Reza Sadr ◽  
Choongho Yu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Carbon Nanotube ◽  
Porous Carbon ◽  
Microbial Fuel Cells ◽  
High Performance ◽  
Three Dimensional
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