Journal ArticleDOI
Promoting Effect of Ni(OH)2 on Palladium Nanocrystals Leads to Greatly Improved Operation Durability for Electrocatalytic Ethanol Oxidation in Alkaline Solution.
Wenjing Huang,Xian-Yin Ma,Han Wang,Renfei Feng,Jigang Zhou,Paul N. Duchesne,Peng Zhang,Fengjiao Chen,Na Han,Feipeng Zhao,Junhua Zhou,Wen-Bin Cai,Yanguang Li +12 more
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TLDR
This study reports the remarkable promoting effect of Ni(OH)2 on Pd nanocrystals for electrocatalytic ethanol oxidation reaction in alkaline solution, which retains a mass-specific current even after 20 000 s of chronoamperometric testing, and can be regenerated via simple cyclic voltammetry cycles in clean KOH.Abstract:
Most electrocatalysts for the ethanol oxidation reaction suffer from extremely limited operational durability and poor selectivity toward the CC bond cleavage. In spite of tremendous efforts over the past several decades, little progress has been made in this regard. This study reports the remarkable promoting effect of Ni(OH)2 on Pd nanocrystals for electrocatalytic ethanol oxidation reaction in alkaline solution. A hybrid electrocatalyst consisting of intimately mixed nanosized Pd particles, defective Ni(OH)2 nanoflakes, and a graphene support is prepared via a two-step solution method. The optimal product exhibits a high mass-specific peak current of >1500 mA mg−1Pd, and excellent operational durability forms both cycling and chronoamperometric measurements in alkaline solution. Most impressively, this hybrid catalyst retains a mass-specific current of 440 mA mg−1 even after 20 000 s of chronoamperometric testing, and its original activity can be regenerated via simple cyclic voltammetry cycles in clean KOH. This great catalyst durability is understood based on both CO stripping and in situ attenuated total reflection infrared experiments suggesting that the presence of Ni(OH)2 alleviates the poisoning of Pd nanocrystals by carbonaceous intermediates. The incorporation of Ni(OH)2 also markedly shifts the reaction selectivity from the originally predominant C2 pathway toward the more desirable C1 pathway, even at room temperature.read more
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Journal ArticleDOI
Boosting oxygen evolution of single-atomic ruthenium through electronic coupling with cobalt-iron layered double hydroxides
Pengsong Li,Maoyu Wang,Xinxuan Duan,Lirong Zheng,Xiaopeng Cheng,Yuefei Zhang,Yun Kuang,Yaping Li,Qing Ma,Zhenxing Feng,Wen Liu,Xiaoming Sun +11 more
TL;DR: It is disclosed that the isolated single atom ruthenium was kept under the oxidation states of 4+ even at high overpotential due to synergetic electron coupling, which endow exceptional electrocatalytic activity and stability simultaneously.
Journal ArticleDOI
Carbon Nanosheets Containing Discrete Co-Nx-By-C Active Sites for Efficient Oxygen Electrocatalysis and Rechargeable Zn–Air Batteries
Yingying Guo,Pengfei Yuan,Jianan Zhang,Yongfeng Hu,Ibrahim Saana Amiinu,Xin Wang,Jigang Zhou,Huicong Xia,Zhibo Song,Qun Xu,Shichun Mu +10 more
TL;DR: DFT calculations demonstrated that the coupling of Co-Nx active sites with B atoms prefers to adsorb an O2 molecule in side-on mode and accelerates ORR kinetics, which shows superior performance with an open-circuit potential of ∼1.4 V, a peak power density of ∼100.4 mW cm-2, and excellent durability.
Journal ArticleDOI
Perspective and status of polymeric graphitic carbon nitride based Z-scheme photocatalytic systems for sustainable photocatalytic water purification
Abhinandan Kumar,Pankaj Raizada,Pardeep Singh,Reena V. Saini,Adesh K. Saini,Ahmad Hosseini-Bandegharaei +5 more
TL;DR: In this article, an in-depth overview comprising traditional photocatalysis along with Z-scheme photocatalytic systems have been exploited and discussed with respect to their facile synthesis techniques and application in environmental restoration.
Journal ArticleDOI
Porous Trimetallic PtRhCu Cubic Nanoboxes for Ethanol Electrooxidation
Journal ArticleDOI
2D PdAg Alloy Nanodendrites for Enhanced Ethanol Electroxidation.
TL;DR: The facile solution synthesis of 2D PdAg alloy nanodendrites as a high-performance electrocatalyst is reported for ethanol electroxidation, and control experiments show that the improvement comes from the combined electronic and structural effects.
References
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Journal ArticleDOI
Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction
TL;DR: The Co₃O₄/N-doped graphene hybrid exhibits similar catalytic activity but superior stability to Pt in alkaline solutions, making it a high-performance non-precious metal-based bi-catalyst for both ORR and OER.
Journal ArticleDOI
Real-space multiple-scattering calculation and interpretation of x-ray-absorption near-edge structure
TL;DR: In this paper, a selfconsistent real-space multiple-scattering (RSMS) approach for calculations of x-ray-absorption near-edge structure (XANES) is presented and implemented in an ab initio code applicable to arbitrary aperiodic or periodic systems.
Journal ArticleDOI
Trends in activity for the water electrolyser reactions on 3d M(Ni,Co,Fe,Mn) hydr(oxy)oxide catalysts.
Ram Subbaraman,Dusan Tripkovic,Kee-Chul Chang,Dusan Strmcnik,Arvydas P. Paulikas,Pussana Hirunsit,Maria K. Y. Chan,Jeffrey Greeley,Vojislav R. Stamenkovic,Nenad M. Markovic +9 more
TL;DR: The overall catalytic activities for these reaction as a function of a more fundamental property, a descriptor, OH-M(2+δ) bond strength (0 ≤ δ ≤ 1.5), provide the foundation for rational design of 'active sites' for practical alkaline HER and OER electrocatalysts.
Journal ArticleDOI
Enhancing Hydrogen Evolution Activity in Water Splitting by Tailoring Li+-Ni(OH)2-Pt Interfaces
Ram Subbaraman,Dusan Tripkovic,Dusan Strmcnik,Kee-Chul Chang,Masanobu Uchimura,Arvydas P. Paulikas,Vojislav R. Stamenkovic,Nenad M. Markovic +7 more
TL;DR: It is found that a controlled arrangement of nanometer-scale Ni(OH)2 clusters on platinum electrode surfaces manifests a factor of 8 activity increase in catalyzing the hydrogen evolution reaction relative to state-of-the-art metal and metal-oxide catalysts.
Journal ArticleDOI
Palladium-Based Electrocatalysts for Alcohol Oxidation in Half Cells and in Direct Alcohol Fuel Cells
Claudio Bianchini,Pei Kang Shen +1 more
TL;DR: Increasing research efforts are carried out to design and develop more efficient anode electrocatalysts for DAFCs, which are attracting increasing interest as power sources for portable applications.
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