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Integration of partially phosphatized bimetal centers into trifunctional catalyst for high-performance hydrogen production and flexible zn-air battery

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Science China Materials 2022年第5期65卷 1176-1186页

作者： Miaosen Yang Yifan Liu Jiaqiang Sun Shusheng Zhang Xijun Liu Jun Luo School of Chemical Engineering Northeast Electric Power UniversityJilin 132012China Nanchang Institute of Technology Nanchang 330044China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China College of Chemistry Zhengzhou UniversityZhengzhou 450000China Institute for New Energy Materials&Low-Carbon Technologies and Tianjin Key Lab for Photoelectric Materials&Devices School of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China MOE Key Laboratory of New Processing Technology for Non-Ferrous Metals and Materials and Guangxi Key Laboratory of Processing for Non-Ferrous Metals and Featured MaterialsSchool of ResourceEnvironments and MaterialsGuangxi UniversityNanning 530004China

The development of robust and efficient trifunctional catalysts showing excellent oxygen evolution reaction(OER), oxygen reduction reaction(ORR) and hydrogen evolution reaction(HER) kinetics has been ***, we prepared a hybrid iron and cobalt-based metal alloy phosphide on a phosphorus and nitrogen co-doped carbon substrate(Fe Co-P/PNC) as a catalyst using a one-step Pregulation method. The catalyst exhibited a positive half-wave potential of 0.86 V versus the reversible hydrogen electrode(RHE) for ORR, and low overpotentials of 350 and 158 m V for OER and HER, respectively, to achieve a current density of10 m A cm^(-2). Density functional theory calculations demonstrated the dominant role of P in both Fe Co phosphide and carbon matrix, which led to the good ORR, OER and HER kinetics. The assembled aqueous and flexible zn-air batteries with Fe Co-P/PNC as the air cathode displayed excellent peak power densities of 195.1 and 90.8 m W cm^(-2), respectively, as well as outstanding charging-discharging performance, long lifetime, and high flexibility. Moreover, the self-powered overall water-splitting cell exhibited a low working voltage of1.71 V to achieve a current density of 10 m A cm^(-2), confirming its excellent multifunctional OER/ORR/HER activity.

关键词： trifunctional electrocatalyst multi-active sites alloy/phosphide hydrogen production flexible zn-air battery

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Self-supported metal(Fe, Co, Ni)-embedded nitrogen-doping carbon nanorod framework as trifunctional electrode for flexible zn-air batteries and switchable water electrolysis

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Green Energy & Environment 2023年第6期8卷 1644-1653页

作者： Qiuyan Jin Liping Xiao Weidong He Hao Cui Chengxin Wang State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou510275China The Key Laboratory of Low-Carbon Chemistry&Energy Conservation of Guangdong Province Sun Yat-sen UniversityGuangzhou510275China

To meet the practical demand of wearable/portable electronics, developing high-efficiency and durable multifunctional catalyst and in-situ assembling catalysts into electrodes with flexible features are urgently needed but challenging. Herein, we report a simple route to fabricate bendable multifunctional electrodes by in-situ carbonization of metal ion absorbed polyaniline precursor. Alloy nanoparticles encapsulated in graphite layer are uniformly distributed in the N-doping carbon nanorod skeleton. Profiting from the favorable free-standing structure and the cooperative effect of metallic nanoparticles, graphitic layer and N doped-carbon architecture, the trifunctional electrodes exhibit prominent activities and stability toward HER, OER and ORR. Notably, due to the protection of carbon layer, the electrocatalysts show the reversible catalytic HER/OER properties. The overall water splitting device can continuously work for 12 h under frequent exchanges of cathode and anode. Importantly, the bendable metal air batteries fabricated by self-supported electrode not only displays the outstanding battery performance,achieving a decent peak power density(125 mW cm^(-2)) and exhibiting favorable charge-discharge durability of 22 h, but also holds superb flexible stability. Specially, a lightweight self-driven water splitting unit is demonstrated with stable hydrogen production.

关键词： Trifunctional catalysts Self-supported electrodes Switchable water splitting flexible zn-air battery Self-powered system

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Direct growth of ordered N-doped carbon nanotube arrays on carbon fiber cloth as a free-standing and binder-free air electrode for flexible quasi-solid-state rechargeable zn-air batteries

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Carbon Energy 2020年第3期2卷 461-471页

作者： Qian Lu Xiaohong Zou Kaiming Liao Ran Ran Wei Zhou Meng Ni Zongping Shao State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjingChina Department of Building and Real Estate The Hong Kong Polytechnic UniversityKowloonHong KongChina WA School of Mines:Minerals Energy and Chemical Engineering(WASMMECE)Curtin UniversityPerthWestern AustraliaAustralia

The development of an air electrode that is flexible in physical property and highly active and durable at different geometric status for both oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is of crucial importance for the rational design of flexible rechargeable zn-air batteries(ZABs).Considering their good elasticity,high conductivity,and superior thermal and chemical stability,carbon nanotubes have been widely used as a catalyst support in various electrocatalysts,while oxide or metal nanoparticles have been frequently deposited on the carbon nanotube substrate to perform as the active *** the poor contact between active materials and carbon nanotubes may introduce a challenge for long-term operating stability,in particular in flexible devices,pure carbon electrocatalyst is highly ***,a free-standing air electrode with cobalt nanoparticles encapsulated N-codoped carbon nanotube arrays uniformly grown on the surface of carbon fiber cloth is developed by a two-step in situ growth *** a carbon-based electrode shows outstanding activity for both ORR and *** flexible ZAB with such air electrode shows superior flexibility and stability working under extreme bending ***,the polarization and round-trip efficiency for the flexible battery is 0.67 V and 64.4%at 2 mA/cm2,respectively,even after being operated for 30 *** study provides a feasible way to design all carbon-based free-standing and flexible electrode and enlightens the electrode design for flexible energy conversion/storage devices.

关键词： carbon nanotube arrays flexible zn-air battery N-doped carbon quasi-solid-state battery

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