Performance Evaluation and Parametric Optimization of a Proton Exchange Membrane Fuel Cell/heat‐driven Heat Pump Hybrid System

Abstract

With the help of the current models of proton exchange membrane (PEM) fuel cells and three-heat-source heat pumps, a generic model of a PEM fuel cell/heat-driven heat pump hybrid system is established, so that the waste heat produced in the PEM fuel cell may be availably utilized. Based on the theory of electrochemistry and non-equilibrium thermodynamics, expressions for the efficiency and power output of the PEM fuel cell, the coefficient of performance and rate of pumping heat of the heat-driven heat pump, and the equivalent efficiency and power output of the hybrid system are derived. The curves of the equivalent efficiency and power output of the hybrid system varying with the electric current density and the equivalent power output versus efficiency curves are represented through numerical calculation. The general performance characteristics of the hybrid system are analyzed. The optimally operating regions of some important parameters of the hybrid system are determined. The influence of some main irreversible losses on the performance of the hybrid system is discussed in detail. The advantages of the hybrid system are revealed.National Natural Science Foundation [51076134]; Fundamental Research Fund for the Central Universities, People's Republic of China [201112G007

An electrochemical energy conversion realized through Ag@Pt/rGO nano-catalyst enhancing activity of the ORR process in a PEMFC

“…On the other hand, the limiting current due to the Pt/C electrocatalyst was revealed to be 3.84 mA cm 2 (based upon the geometric area) in the ORR. This parameter was enhanced to 5 mA cm 2 for the (1:3) Ag@Pt/rGO material. These values indicated that the di usion-limiting currents were strongly a ected by the core-shell structure and the supporting materials for the Pt catalyst.…”

“…Ultimately, the MEA was assembled with the GDL for the electrochemical tests in a 6.25 cm 2 Paxi-tech single fuel cell [57]. Accordingly, both anode and cathode contained platinum loadings of 0.5 mg cm 2 (MEA-1) and a 1:3 mass ratio of Ag@Pt/rGO (MEA-2) all with a Na on loading of 0.9 mg cm 2 .…”

“…In order to obtain a clean and environmentally-friendly power source, PEMFCs are considered to more mature and developed than other green devices due to their possessing advantages: i) a low working temperature of 80 C, ii) good energy e ciency, iii) high power density per unit volume, iv) immobilized electrolyte, and v) near-zero emission [1][2][3][4][5]. In light of growing demand for the commercialization of PEM fuel cells, considerable attention has been given to cost reduction while increasing the durability of such systems [5].…”

Optimal current paths for a class of generalized electrochemical reaction systems

“…、燃料电池-制冷机 [55,56] 、燃料电池-热泵 [57] 、 燃料电池-热电发电机 [58,59] 、燃料电池-真空热离子混 合系统 [60] 、光子增强热离子发电机 [61,62] 和量子点热 机 [63] 各种系统的最优性能. [68] 在给定时间约束下, 对间歇反应器中的nA mB 型化学反应进行了产率最大化研究, 得到了最优的反 应体积和温度最优构型.…”