Materials Today Physics
·
2024
·
IF 10
Mohamedazeem M. Mohideen,Abdul Qadir,Balachandran Subramanian,Seeram Ramakrishna,Yong Liu
The quest for non-precious electrocatalysts through biomass for energy applications has attracted keen interest, but optimization for fuel cells remains challenging. Herein, we have developed a nitrogen and sulfur-anchored MXene hybrid chitosan-derived carbon sphere (N,S-MXC) reporting for the first time as a novel oxygen reduction reaction (ORR) electrocatalyst. Interestingly, as the mass ratio of MXene to Chitosan varied by (1:2, 1:1, and 2:1), the microstructures of the as-prepared catalysts changed, which drastically influenced the corresponding ORR performance. Notably, when the mass ratio was maintained to be 1:2, Ti 3 C 2 nanoparticles were dispersed on the surface of the biomass carbon core shell. They created multimodal porous morphology that helps to facilitate faster electron transfer, resulting in a high onset-potential of 0.89 V and limiting current density of −4.2 mA/cm 2 as well as excellent durability with minimum half-wave potential loss of 2.3 mV after 5000 cyclic voltammetry (CV) cycles than benchmark Pt/C. In addition, the corresponding catalyst also possessed robust stability of 87.47 % and an excellent methanal poisoning tolerance effect in an alkaline medium. In a nutshell, this work paves the pathway for converting sea animal waste to develop porous carbon as supporting material for fuel cells that directly or indirectly support achieving carbon neutrality.
研究领域:
材料科学
·
电化学
·
能源材料
·
可持续化学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Denian Li,Yukun Fan,Haoran Yuan,Lifang Deng,Jizhang Yang,Yong Chen,Bo Luo
An efficient, renewable, and economic electrocatalyst for the oxygen reduction reaction (ORR) is particularly important for next-generation fuel cells and metal–air batteries, and yet this remains a great challenge. In this contribution, we propose a facile and scalable route to the meso–microporous carbon with high specific surface area and enriched pyridinic nitrogen on the basis of direct carbonization of aquatic Scindapsus prior to ammonia injection. The metal-free catalyst proved to be an excellent electrocatalyst for the ORR in alkaline solutions, in terms of the onset potential and limited diffusion current density. It is comparable to a commercial Pt/C catalyst, arising from the large interface and heavy nitrogen doping. In addition to the robust stability against methanol poisoning and long-term operation, this carbonaceous catalyst provides a scalable and economic alternative choice for construction of high-performance ORR-based energy devices at a low cost, which may propel the applications of emerging green energy technologies.
研究领域:
材料科学
·
电化学
·
能源技术
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-11
·
IF 4.011
Khan Karim,Tareen Ayesha Khan,Aslam Muhammad,Ali Khan Sayed,khan Qasim,Khan Qudrat Ullah,Saeed Muhammad,Siddique Saleemi Awais,Kiani Maryam,Ouyang Zhengbiao,Zhang Han,Guo Zhongyi
Since the last decades, non-precious metal catalysts (NPMC), especially iron based electrocatalysts show sufficient activity, potentially applicant in oxygen reduction reaction (ORR), however they only withstand considerable current densities at low operating potentials. On the other hand iron based electrocatalysts are not stable at elevated cathode potentials, which is essential for high energy competence, and its remains difficult to deal. Therefore, via this research a simple approach is demonstrated that allows synthesis of nanosize Fe-doped mayenite electride, [Ca 24 Al 28 O 64 ] 4+ ·(e − ) 4 (can also write as, C 12 A 7−x Fe x :e − , where doping level, x = 1) (thereafter, Fe-doped C12A7:e − ), consist of abundantly available elements with gram level powder material production, based on simple citrate sol-gel method. The maximum achieved conductivity of this first time synthesized Fe-doped C12A7:e − composite materials was 249 S/cm. Consequently, Fe-doped C12A7:e − composite is cost-effective, more active and highly durable precious-metal free electrocatalyst, with 1.03 V onset potential, 0.89 V (RHE) half-wave potential, and ~5.9 mA/cm 2 current density, which is higher than benchmark 20% Pt/C (5.65 mA/cm 2 , and 0.84 V). The Fe-doped C12A7:e − has also higher selectivity for desired 4e − pathway, and more stable than 20 wt% Pt/C electrode with higher immunity towards methanol poisoning. Fe-doped C12A7:e − loses was almost zero of its original activity after passing 11 h compared to the absence of methanol case, indicates that to introduce methanol has almost negligible consequence for ORR performance, which makes it highly desirable, precious-metal free electrocatalyst in ORR. This is primarily described due to coexistence of Fe-doped C12A7:e − related active sites with reduced graphene oxide (rGO) with pyridinic-nitrogen, and their strong coupling consequence along their porous morphology textures. These textures assist rapid diffusion of molecules to catalyst active sites quickly. In real system maximum power densities reached to 243 and 275 mW/cm 2 for Pt/C and Fe-doped C12A7:e − composite, respectively.
研究领域:
电化学
·
材料科学
·
催化
·
能源材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）