scholarly journals Metal-Free Pyrene-Based Conjugated Microporous Polymer Catalyst Bearing N- and S-Sites for Photoelectrochemical Oxygen Evolution Reaction

2021 ◽  
Vol 9 ◽  
Author(s):  
Sabuj Kanti Das ◽  
Sanjib Shyamal ◽  
Manisha Das ◽  
Saptarsi Mondal ◽  
Avik Chowdhury ◽  
...  
Keyword(s):  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Magic Angle Spinning ◽  
Bandgap Energy ◽  
Magic Angle ◽  
Low Bandgap ◽  
Metal Free ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer

The development of an efficient, sustainable, and inexpensive metal-free catalyst for oxygen evolution reaction (OER) via photoelectrochemical water splitting is very demanding for energy conversion processes such as green fuel generators, fuel cells, and metal-air batteries. Herein, we have developed a metal-free pyrene-based nitrogen and sulfur containing conjugated microporous polymer having a high Brunauer-Emmett-Teller surface area (761 m2 g−1) and a low bandgap of 2.09 eV for oxygen evolution reaction (OER) in alkaline solution. The π-conjugated as-synthesized porous organic material (PBTDZ) has been characterized by Fourier transform infrared spectroscopy (FT-IR), solid-state 13C (cross-polarization magic angle spinning-nuclear magnetic resonance) CP-MAS NMR, N2 adsorption/desorption analysis, field-emission scanning electron microscope (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA) experiments. The material acts as an efficient catalyst for photoelectrochemical OER with a current density of 80 mA/cm2 at 0.8 V vs. Ag/AgCl and delivered 104 µmol of oxygen in a 2 h run. The presence of low bandgap energy, π-conjugated conducting polymeric skeleton bearing donor heteroatoms (N and S), and higher specific surface area associated with inherent microporosity are responsible for this admirable photoelectrocatalytic activity of PBTDZ catalyst.

Bimetallic Conjugated Microporous Polymer Derived B, N-doped Porous Carbon Wrapped Co3Fe7 alloy Composite as Bifunctional Oxygen Electrocatalyst for Zn-air battery

2021 ◽  
Author(s):  
Jinli Dou ◽  
Hantian Luo ◽  
Chunli Zhang ◽  
Jingjing Lu ◽  
Xiujuan Luan ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Evolution ◽  
Porous Carbon ◽  
Oxygen Evolution Reaction ◽  
High Performance ◽  
Reduction Reaction ◽  
Alloy Composite ◽  
Conjugated Microporous Polymer ◽  
Microporous Polymer ◽  
Air Battery

The exploration and development of high-performance, durable, and economic bifunctional electrocatalysts towards oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is essential but challenging for the development of rechargeable...

High Surface Area NiCoP Nanostructure as Efficient Water Splitting Electrocatalyst for the Oxygen Evolution Reaction

2021 ◽  
pp. 111312
Author(s):  
Sisir Maity ◽  
Dheeraj Kumar Singh ◽  
Divya Bhutani ◽  
Suchitra Prasad ◽  
Umesh V. Waghmare ◽  
...  
Keyword(s):  
Surface Area ◽  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
High Surface ◽  
High Surface Area

Cathodic Corrosion Activated Fe-based Nanoglass as Highly-Active and -Stable Oxygen Evolution Catalyst for Water Splitting

2021 ◽  
Author(s):  
Kaiyao Wu ◽  
Fei Chu ◽  
Yuying Meng ◽  
Kaveh Edalati ◽  
Qingsheng Gao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Amorphous Alloys ◽  
Precious Metal ◽  
Active Sites ◽  
Metal Free ◽  
Highly Active ◽  
Stable Oxygen ◽  
Surface Active

Transition metal-based amorphous alloys have attracted increasing attention as precious-metal-free electrocatalysts for oxygen evolution reaction (OER) of water splitting due to their high macro-conductivity and abundant surface active sites. However,...

Coupling Ag-doping and rich oxygen vacancies in mesoporous NiCoO nanorods supported on nickel foam for highly efficient oxygen evolution

2017 ◽  
Vol 4 (11) ◽  
pp. 1783-1790 ◽  
Author(s):  
Kai-Li Yan ◽  
Jing-Qi Chi ◽  
Zi-Zhang Liu ◽  
Bin Dong ◽  
Shan-Shan Lu ◽  
...  
Keyword(s):  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Oxygen Vacancies ◽  
Nickel Foam ◽  
High Surface ◽  
High Surface Area ◽  
Ag Doping ◽  
Highly Efficient

Ag-doped mesoporous NiCoO nanorods as efficient and stable electrocatalysts for oxygen evolution reaction have been synthesized with desirable conductivity, high surface area and rich oxygen vacancies.

Synergistic modulation of the metal-free photocatalysts by composition ratio change and heteroatom doping for overall water splitting

2021 ◽  
Author(s):  
Jianxiong Tian ◽  
Zhaobo Zhou ◽  
Sheng Zhang ◽  
Zhixia Li ◽  
Li Shi ◽  
...  
Keyword(s):  
Water Splitting ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Carbon Nitride ◽  
Reaction Rate ◽  
Graphitic Carbon Nitride ◽  
Heteroatom Doping ◽  
Metal Free ◽  
Ratio Change ◽  
Synergistic Modulation

The graphitic carbon nitride (g-C3N4) based metal-free photocatalyts have attracted growing attention in recent years, while the efficiency is largely limited by the slow reaction rate of oxygen evolution reaction...

scholarly journals Highly efficient oxygen evolution reaction via facile bubble transport realized by three-dimensionally stack-printed catalysts

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Ye Ji Kim ◽  
Ahyoun Lim ◽  
Jong Min Kim ◽  
Donghoon Lim ◽  
Keun Hwa Chae ◽  
...  
Keyword(s):  
Surface Area ◽  
Oxygen Evolution ◽  
Oxygen Evolution Reaction ◽  
Specific Activity ◽  
Theoretical Calculations ◽  
Nanostructured Catalysts ◽  
Building Blocks ◽  
Utilization Efficiency ◽  
Active Surface Area ◽  
Mass Activity

Abstract Despite highly promising characteristics of three-dimensionally (3D) nanostructured catalysts for the oxygen evolution reaction (OER) in polymer electrolyte membrane water electrolyzers (PEMWEs), universal design rules for maximizing their performance have not been explored. Here we show that woodpile (WP)-structured Ir, consisting of 3D-printed, highly-ordered Ir nanowire building blocks, improve OER mass activity markedly. The WP structure secures the electrochemically active surface area (ECSA) through enhanced utilization efficiency of the extended surface area of 3D WP catalysts. Moreover, systematic control of the 3D geometry combined with theoretical calculations and various electrochemical analyses reveals that facile transport of evolved O2 gas bubbles is an important contributor to the improved ECSA-specific activity. The 3D nanostructuring-based improvement of ECSA and ECSA-specific activity enables our well-controlled geometry to afford a 30-fold higher mass activity of the OER catalyst when used in a single-cell PEMWE than conventional nanoparticle-based catalysts.

Sign in / Sign up

Export Citation Format

Share Document