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Coupling functional anodes with natural air-diffused cathodes enables highly efficient hydrogen peroxide electrosynthesis

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2023年第4期24卷 377-386页

作者： Chen LING Aiping LIANG Chaolin LI Wenhui WANG School of Civil and Environmental Engineering Harbin Institute of TechnologyShenzhenShenzhen 518055China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090 China

Electrosynthesis of hydrogen peroxide(H_(2)O_(2))is a decentralized production method with excellent application *** anodes with cathodes can achieve highly efficient electrosynthesis of hydrogen *** this study,we prepared an anode for H_(2)O_(2) electrosynthesis via the two-electron water oxidation reaction(2e-WOR)by modifying carbon fiber paper with self-assembling *** addition,a natural air-diffused cathode loaded with polytetrafluoroethylene/carbon black using carbon cloth as substrate was prepared to combine with the modified anode to produce H_(2)O_(2) *** total current efficiency of the anode and cathode reached 152.9%,and the H_(2)O_(2) production rate was as high as 38μmol/min at 2.8 V *** hydrogen electrodes(RHE)in a Nafion 117 membrane-separated *** work reported a novel carbon-based 2e-WOR catalyst and laid a theoretical foundation for the simultaneous electrosynthesis of H_(2)O_(2) with an anode and cathode.

关键词： two-electron water oxidation two-electron oxygen reduction Self-assembled membrane Hydrogen peroxide Electrosynthesis

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Electrocatalytic generation of hydrogen peroxide on cobalt nanoparticles embedded in nitrogen-doped carbon

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Chinese Journal of Catalysis 2021年第12期42卷 2296-2305页

作者： Basil Sabri Rawah Wenzhen Li Chemical and Biological Engineering Department Biorenewables Research LaboratoryIowa State UniversityAmesIA 50011USA Chemical and Biological Engineering Department University of JeddahJeddah 23890Saudi Arabia

Electrocatalytic reduction of oxygen is a growing synthetic technique for the sustainable production of hydrogen peroxide(H_(2)O_(2)).The current challenges concern seeking low-cost,highly active,and selective ***-nitrogen-doped carbon containing catalytically active cobalt-nitrogen(Co-N_(x))sites is an emerging class of materials that can promote the electrochemical generation of H_(2)O_(2).Here,we report a straightforward method for the preparation of cobalt-nitrogen-doped carbon composed of a number of Co-N_(x)moieties using low-energy dry-state ball milling,followed by controlled *** scalable method uses inexpensive materials containing cobalt acetate,2-methylimidazole,and Ketjenblack EC-600JD as the metal,nitrogen,and carbon precursors,*** measurements in an acidic medium show the present material exhibits a significant increase in the oxygen reduction reaction current density,accompanied by shifting the onset potential into the positive *** current catalyst has also demonstrated an approximate 90%selectivity towards H_(2)O_(2)across a wide range of *** H_(2)O_(2)production rate,as measured by H_(2)O_(2)bulk electrolysis,has reached 100 mmol g_(cat).^(–1)h^(–1)with high H_(2)O_(2)faradaic efficiency close to 85%(for 2 h at 0.3 V ***).Lastly,the catalyst durability has been tested(for 6 h at 0.3 V ***).The catalyst has shown relatively consistent performance,while the overall faradic efficiency reaches approximate 85%throughout the test cycle indicating the promising catalyst durability for practical *** formed Co-N_(x)moieties,along with other parameters,including the acidic environment and the applied potential,likely are the primary reasons for such high activity and selectivity to H_(2)O_(2)production.

关键词： Hydrogen peroxide two-electron oxygen reduction Carbon catalyst Electrocatalysis

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Charge state modulation on boron site by carbon and nitrogen localized bonding microenvironment for two-electron electrocatalytic H_(2)O_(2)production

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Chinese Chemical Letters 2023年第5期34卷 598-603页

作者： Tingting Zhang Yin Wang Xiangyang Li Quan Zhuang Zixuan Zhang Hong Zhou Qin Ding Yingqi Wang Yuxin Dang Limei Duan Jinghai Liu Inner Mongolia Key Laboratory of Carbon Nanomaterials College of Chemistry and Materials ScienceNano Innovation InstituteInner Mongolia Minzu UniversityTongliao 028000China Tongliao Center for Disease Control and Prevention Tongliao 028000China

Design of electrochemical active boron(B)site at solid materials to understand the relationships between the localized structure,charge state at the B site and electrocatalytic activity plays a crucial role in boosting the green electrochemical synthesis of hydrogen peroxide(H_(2)O_(2))via two-electron oxygen reduction(2eORR)***,we demonstrate a carbon(C)and nitrogen(N)localized bonding microenvironment to modulate the charge state of B site at the boron-carbon nitride solid(BCNs)to realize the efficient selective electrocatalytic H_(2)O_(2)*** localized chemical structure of N-B-N,N-B-C and C-B-C bonds at B site can be regulated through solid-state reaction between boron nitride(BN)and porous carbon(C)at variable *** optimized BCN-1100 achieves an outstanding H_(2)O_(2)selectivity of 89%and electron transfer number of 2.2(at 0.55 V ***),with the production of 10.55mmol/L during 2.5 h and the catalytic stability duration for 15000 *** first-principles calculations identified the dependency of localized bonding microenvironment on the OOH~*adsorption energies and relevant charge states at the boron *** localized structure of B site with BNC_(2)-Gr configuration is predicted to be the highest 2eORR activity.

关键词： Solid boron site Charge state modulation Localized bonding microenvironment two-electron oxygen reduction H_(2)O_(2)electrosynthesis

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