The alkaline operating environment of anion-exchange membrane (AEM) fuel cells (AEMFCs) makes it possible to employ a wide variety of catalysts, including platinum group metals (PGMs) as well as PGM-free materials. However, little is understood about radical formation during AEMFC operation with different catalysts and their implications. …

Abstract. The anion exchange membrane fuel cell (AEMFC) is an attractive alternative to acidic proton exchange membrane fuel cells, which to date have required …

Alkaline anion exchange membrane fuel cells (AAEMFC) are attracting ever-increasing attention, as they are promising electrochemical devices for energy production, …

In the last few years, the development of radiation-grafted powder-form anion-exchange ionomers (AEI), used in combination with anion-exchange membranes (AEM), has led to the assembly of AEM-based fuel cells (AEMFC) that routinely yield power densities ranging between 1–2 W cm −2 (with a variety of catalysts). However, to date, only …

Anion exchange membrane fuel cells (AEMFCs) are attractive alternatives to proton exchange membrane fuel cells due to their ability to employ nonprecious metals as catalysts, reducing the cost of AEMFC devices. This paper presents an experimental exploration of the carbon support material effects on AEMFC performance. The silver …

Finally, Mustain and colleagues demonstrated that the low-PGM-loaded AEMFC met the US DOE 2022 milestone with a beginning-of-life operating voltage of 0.65 V at 1.0 A cm –2 under H 2 /O 2 ...

In this study, we investigated experimentally and theoretically the effect of membrane thickness on AEMFC performance using both PGM-based and PGM-free …

For the performance tests of a single AEMFC, the obtained results indicate that the maximum power density using Ag/MWCNT as the cathode catalyst (356.5 mW·cm −2) was higher than that using Ag/AC (329.3 mW·cm −2) and Ag/CB (256.6 mW·cm −2). The better cell performance obtained using a MWCNT support can be ascribed to the …

Health, Safety And Environmental Committee. Open Tenders (all) All Tenders/Bids must be submitted on the official forms provided. APPOINTMENT OF A PANEL OF SERVICE PROVIDERS FOR LEGAL TRANSACTIONAL ADVISORS FOR AFRICAN EXPLORATION MINING AND FINANCE CORPORATION (SOC) LTD …

AEMFC degradation rates can increase substantially when the humidity level is low or at elevated cell temperatures (90 °C or higher). The main reason for the performance stability decay is the chemical degradation of …

This review briefly covers new concepts in the complex AEMFC catalyst layer, before a detailed discussion on advances in CLs based on the design of AEIs and electrocatalysts. The importance of the ...

It has been long-recognized that carbonation of anion exchange membrane fuel cells (AEMFCs) would be an important practical barrier for their implementation in applications that use ambient air …

Overall AEMFC performance for the different Ag 1− x Pd x alloy compositions is shown in Figs. 2a,b (60 °C) and 2d,e (80 °C), with measured cell voltages and power densities as a function of ...

The best result in the literature for an AEMFC with a PGM-free cathode was achieved with a 100 h H 2 /air(CO 2-free) cell with the voltage decaying at a rate of 1 mV h −1 (ref. 38), and the best ...

African Exploration Mining and Finance Corporation SOC Limited (Registration number 1944/018018/30) Annual Report for the year ended 31 March 2015 These Annual Financial Statements were prepared under the guidance of Ms B Mdyesha (CA) SA General Manager …

The goals of this project are to evaluate the performance of AEMFCs with platinum group metal (PGM) content and PGM-free cathode catalysts under various operating …

Fig. 1 (A) Schematic of AEMFC water consumption, generation, migration, and diffusion; (B) i – V and (C) i –power curves (10 mV s −1 forward scans) of AEMFCs with an ETFE-based AEM and AEI, both containing a benzyl …

The CF-VC catalyst showed good ORR activity, possessing a half-wave potential of 0.71 V. Although the intrinsic activity of the CF-VC catalyst was not as high as some other platinum group metal ...

The performance of an anion exchange membrane fuel cell (AEMFC) under various operating conditions, including cell temperature and humidification of inlet gases, was systematically investigated in this study. The experimental results indicate that the power density of an AEMFC is susceptible to the cell temperature and inlet gas …

The anode and cathode flowrates entering the AECS were both 1.0 L/min. The 5 cm 2 AEMFC was operated at temperatures of 66/68/80 °C and was assembled with a PtRu/C anode, Pt/C cathode and GT72-5 ...

Specifically, the peak power density of AEMFC is 1.77 W cm −2 with a H 2 flow rate of 75 mL min −1, retaining >70% power density from the H 2 flow rate of 1000 mL min −1 (2.42 W cm −2). Importantly, the present AEMFCs display much higher hydrogen utilization efficiency above 90% and hydrogen fuel power (∼30 W cm −2 L −1 ) than ...

First cell performance tests appeared in early days of development of AEMFC technology. Data adapted from Agel et al. [24] (black curves; reported AEM conductivity of 0.1 mS cm À1 ) and from ...

Abstract. Alkaline exchange membrane fuel cells (AEMFCs) have advanced rapidly in recent years and now show improved potential to become a low-temperature …

Appointment of a SUITABLY QUALIFIED Service Provider FOR the PROVISION OF Mine PLANNING SERVICES, TO DEVELOP SHORT-TERM AND MEDIUM-TERM Mine PLANNING, for African Exploration Mining and Finance Corporation (SOC) LTD ("AEMFC") for a period of three (3) YEARS. BID NUMBER: …

It has been long-recognized that carbonation of anion exchange membrane fuel cells (AEMFCs) would be an important practical barrier for their implementation in applications that use ambient air containing atmospheric CO 2.Most literature discussion around AEMFC carbonation has hypothesized: (1) that the effect of carbonation is limited to an increase …

A single AEMFC includes the hardware (i.e. a gasket providing the seal around the membrane electrode assembly (MEA) to prevent leakage of gases) to protect the cell and the MEA. The latter consists of the AEM, the anode and cathode catalyst layers and the cathode gas diffusion layer (GDL) ( Fig. 2 ).

the AEMFC technology is promising, the longevity challenges remain, originating from the still-limited long-term stability of hydroxide-conducting ionomers, particularly when operating at higher cell temperatures. 1. Introduction In response to global pollution, associated mainly with fossil fuels use, utilising new ways in energy generation ...

Anion-exchange membrane fuel cells (AEMFC) have attracted research interest since 2000, 1 which has mainly been justified by their potential for the utilisation of non-Pt electrocatalysts (an ultimate target is the use of non-precious-metal electrocatalysts). 2 The two critical in situ issues that need to be overcome are: (1) performance and (2) …

AEMFC. African Exploration Mining and Finance Corporation also known as "AEMFC" is a state-owned mining company established to secure South Africa's energy supply primarily through the mining and supply of …

The in situ half-cell measurement specifically analyzed the AEMFC cathode ORR (Eq. 1) potential, as an indication of the Pt/C activity.As shown in Fig. 2, the initial Pt/C cathode potential is 0.31 V vs. SHE, which is a reasonable measurement compared to the theoretical 0.40 V vs. SHE ORR potential [].This value decreased to 0.27 V vs. SHE …

A typical schematic diagram of AEMFC, composed of anode/membrane/cathode, involving the conduction medium of OH within the alkaline membrane is shown in Figure 1. Although the stack design of AEMFC is similar to that of PEMFC, the different conduction medium between the membrane of AEMFC and …

Fig. 2 (A) Operando in-plane neutron radiographic images of water in the gas diffusion layers, catalyst layers, and the radiation-grafted ETFE–BTMA AEM in an AEMFC operating at 1.5 A cm −2, 60 °C, 1.0 L min −1 H 2 and O 2, after equilibration at the following symmetric dew points: optimized (anode/cathode: 50 °C/50 °C), optimized +1 ...

Popov group has also shown an AEMFC with a peak power density of 196 mW/cm 2 using Pt cathode catalyst and A201 membrane (Tokuyama) at 50°C (Li et al., 2011). Our performance baseline of the AEMFC with Pt/C catalyst (247 mW/cm 2 at 80°C) is close to these recent-published work. The small Ag nanoparticle catalyst has …

African Exploration Mining and Finance Corporation (SOC) Ltd ("AEMFC") is the State Owned Mining Company established to secure South Africa's energy supply primarily through the mining and supply of coal for the generation of electricity, as well as securing other resources that will provide energy for the future, including key minerals for …

Three domains are considered in the model; the two porous catalyst layers and the membrane. A schematic of an AEMFC, with these domains marked, is shown in Fig. (V), the potential in the solid phase, (dimensionless). In the membrane, ) are the corresponding, effective, conductivities. The definition of the local current density is …

The AEMFC emerged as an excellent alternative due to its air CO 2-free emissions [1], low-cost electrocatalyst used at the cathode [2], and industrial-scale membrane production development [3], [4], [5]. Many efforts have been made to have AEMFC performances like those already shown by the proton exchange membrane fuel …

Advancing the field towards more viable and economical devices, in this Article we designed and developed ultra-low-loading, stable, Pt-free ORR catalysts …